<SEC-DOCUMENT>0001493152-21-019448.txt : 20210812
<SEC-HEADER>0001493152-21-019448.hdr.sgml : 20210812
<ACCEPTANCE-DATETIME>20210812090215
ACCESSION NUMBER:		0001493152-21-019448
CONFORMED SUBMISSION TYPE:	10-Q
PUBLIC DOCUMENT COUNT:		78
CONFORMED PERIOD OF REPORT:	20210630
FILED AS OF DATE:		20210812
DATE AS OF CHANGE:		20210812

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Celsion CORP
		CENTRAL INDEX KEY:			0000749647
		STANDARD INDUSTRIAL CLASSIFICATION:	PHARMACEUTICAL PREPARATIONS [2834]
		IRS NUMBER:				521256615
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		10-Q
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-15911
		FILM NUMBER:		211165650

	BUSINESS ADDRESS:	
		STREET 1:		997 LENOX DRIVE
		STREET 2:		SUITE 100
		CITY:			LAWRENCEVILLE
		STATE:			NJ
		ZIP:			08648
		BUSINESS PHONE:		(609) 896-9100

	MAIL ADDRESS:	
		STREET 1:		997 LENOX DRIVE
		STREET 2:		SUITE 100
		CITY:			LAWRENCEVILLE
		STATE:			NJ
		ZIP:			08648

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	CELSION CORP
		DATE OF NAME CHANGE:	19980515

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	CHEUNG LABORATORIES INC
		DATE OF NAME CHANGE:	19920703
</SEC-HEADER>
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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"></p>

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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 18pt Times New Roman, Times, Serif"><b>UNITED
STATES</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 18pt Times New Roman, Times, Serif"><b>SECURITIES
AND EXCHANGE COMMISSION</b></span></p>

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D.C. 20549</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 18pt Times New Roman, Times, Serif"><b>FORM
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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">(Mark
One)</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">For
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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">OR</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">For
the transition period from ____________ to ____________</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">Commission
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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

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  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
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    <td style="font: 10pt Times New Roman, Times, Serif; width: 2%; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: black 1.5pt solid; font: 10pt Times New Roman, Times, Serif; width: 49%; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b><span id="xdx_90D_edei--EntityTaxIdentificationNumber_c20210101__20210630_zciYR90PVuo1"><ix:nonNumeric contextRef="From2021-01-01to2021-06-30" name="dei:EntityTaxIdentificationNumber">52-1256615</ix:nonNumeric></span></b></span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">(State
                                            or other jurisdiction of</span></p>
    <p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">incorporation
    or organization)</span></p></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">(I.R.S.
                                            Employer</span></p>
    <p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">Identification
    Number)</span></p></td></tr>
  </table>
<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span id="xdx_906_edei--EntityAddressAddressLine1_c20210101__20210630_zK9C28oq6aae" style="font: 10pt Times New Roman, Times, Serif"><b><ix:nonNumeric contextRef="From2021-01-01to2021-06-30" name="dei:EntityAddressAddressLine1">997 Lenox Drive</ix:nonNumeric></b></span><b><span style="font: 10pt Times New Roman, Times, Serif">, <span id="xdx_908_edei--EntityAddressAddressLine2_c20210101__20210630_z5NnMYEdhgKk"><ix:nonNumeric contextRef="From2021-01-01to2021-06-30" name="dei:EntityAddressAddressLine2">Suite 100</ix:nonNumeric></span></span></b><b><span style="font: 10pt Times New Roman, Times, Serif">,</span></b></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span id="xdx_902_edei--EntityAddressCityOrTown_c20210101__20210630_z3aasCQQFA16" style="font: 10pt Times New Roman, Times, Serif"><b><ix:nonNumeric contextRef="From2021-01-01to2021-06-30" name="dei:EntityAddressCityOrTown">Lawrenceville</ix:nonNumeric></b></span><span style="font-family: Times New Roman, Times, Serif">,
<span id="xdx_903_edei--EntityAddressStateOrProvince_c20210101__20210630"><b><ix:nonNumeric contextRef="From2021-01-01to2021-06-30" name="dei:EntityAddressStateOrProvince">NJ</ix:nonNumeric></b></span></span><b> <span id="xdx_90E_edei--EntityAddressPostalZipCode_c20210101__20210630_zbR8wDgCDmI" style="font-family: Times New Roman, Times, Serif"><ix:nonNumeric contextRef="From2021-01-01to2021-06-30" name="dei:EntityAddressPostalZipCode">08648</ix:nonNumeric></span></b></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">(Address
of principal executive offices)</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span id="xdx_902_edei--CityAreaCode_c20210101__20210630_zqwJEZgPuvt2" style="font: 10pt Times New Roman, Times, Serif"><b><ix:nonNumeric contextRef="From2021-01-01to2021-06-30" name="dei:CityAreaCode">(609)</ix:nonNumeric>
</b></span><b><span id="xdx_90A_edei--LocalPhoneNumber_c20210101__20210630_zkXzZ75ZhDE9" style="font: 10pt Times New Roman, Times, Serif"><ix:nonNumeric contextRef="From2021-01-01to2021-06-30" name="dei:LocalPhoneNumber">896-9100</ix:nonNumeric></span></b></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">(Registrant&#8217;s
telephone number, including area code)</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>NA</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">(Former
name, former address and former fiscal year, if changed since last report)</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">Securities
registered pursuant to Section 12(b) of the Act</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<table cellspacing="0" cellpadding="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="border-bottom: black 1.5pt solid; font: 10pt Times New Roman, Times, Serif; width: 36%; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">Title
    of each class</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 2%; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: black 1.5pt solid; font: 10pt Times New Roman, Times, Serif; width: 20%; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">Trading
    symbol(s)</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 2%; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: black 1.5pt solid; font: 10pt Times New Roman, Times, Serif; width: 40%"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">Name
                                            of each exchange on which registered</span></p></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span id="xdx_901_edei--Security12bTitle_c20210101__20210630_zrGEMvvF15v4" style="font: 10pt Times New Roman, Times, Serif"><ix:nonNumeric contextRef="From2021-01-01to2021-06-30" name="dei:Security12bTitle">Common
    stock, par value $0.01 per share</ix:nonNumeric></span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span id="xdx_909_edei--TradingSymbol_c20210101__20210630_zG6UoRVKVcV1" style="font: 10pt Times New Roman, Times, Serif"><ix:nonNumeric contextRef="From2021-01-01to2021-06-30" name="dei:TradingSymbol">CLSN</ix:nonNumeric></span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span id="xdx_903_edei--SecurityExchangeName_c20210101__20210630_zWlTUwjYLlUc" style="font: 10pt Times New Roman, Times, Serif"><ix:nonNumeric contextRef="From2021-01-01to2021-06-30" format="ixt-sec:exchnameen" name="dei:SecurityExchangeName">Nasdaq</ix:nonNumeric>
    </span><span style="font: 10pt Times New Roman, Times, Serif">Capital Market</span></td></tr>
  </table>
<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Indicate
by check mark whether the Registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange
Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports) and (2)
has been subject to such filing requirements for the past 90 days. <span id="xdx_907_edei--EntityCurrentReportingStatus_c20210101__20210630_zH7nEOlh6uI9"><ix:nonNumeric contextRef="From2021-01-01to2021-06-30" name="dei:EntityCurrentReportingStatus">Yes</ix:nonNumeric>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">&#9746; No &#9744;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Indicate
by check mark whether the Registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule
405 of Regulation S-T (&#167;232.405 of this chapter) during the preceding 12 months (or for such shorter period that the Registrant
was required to submit such files). <span id="xdx_90F_edei--EntityInteractiveDataCurrent_c20210101__20210630_zy7oj0Psuiwh"><ix:nonNumeric contextRef="From2021-01-01to2021-06-30" name="dei:EntityInteractiveDataCurrent">Yes</ix:nonNumeric></span></span>
<span style="font: 10pt Times New Roman, Times, Serif">&#9746; No &#9744;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Indicate
by check mark whether the Registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting
company or an emerging growth company. See the definitions of &#8220;large accelerated filer,&#8221; &#8220;accelerated filer&#8221;,
&#8220;smaller reporting company&#8221; and &#8220;emerging growth company&#8221; in Rule 12b-2 of the Exchange Act (Check One):</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"></span></p>

<table cellspacing="0" cellpadding="0" style="font: 11pt Calibri, Helvetica, Sans-Serif; width: 100%; border-collapse: collapse">
  <tr style="vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; width: 3%"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 50%"><span style="font: 10pt Times New Roman, Times, Serif">Large accelerated filer &#9744;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 47%"><span style="font: 10pt Times New Roman, Times, Serif">Accelerated filer &#9744;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif"><span id="xdx_907_edei--EntityFilerCategory_c20210101__20210630_zuAlt7cjay6g"><ix:nonNumeric contextRef="From2021-01-01to2021-06-30" format="ixt-sec:entityfilercategoryen" name="dei:EntityFilerCategory">Non-accelerated filer</ix:nonNumeric></span> &#9744;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif">Smaller reporting company <span id="xdx_907_edei--EntitySmallBusiness_c20210101__20210630_zHS4VgGrSKU5"><ix:nonNumeric contextRef="From2021-01-01to2021-06-30" format="ixt:booleantrue" name="dei:EntitySmallBusiness">&#9746;</ix:nonNumeric></span></span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif">Emerging growth company <span id="xdx_90A_edei--EntityEmergingGrowthCompany_c20210101__20210630_z5zvS48P9wm"><ix:nonNumeric contextRef="From2021-01-01to2021-06-30" format="ixt:booleanfalse" name="dei:EntityEmergingGrowthCompany">&#9744;</ix:nonNumeric></span></span></td>
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  </table>
<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span>&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">If
an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying
with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. &#9744;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Indicate
by check mark whether the Registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes &#9744; <span id="xdx_90B_edei--EntityShellCompany_c20210101__20210630_zSmOmA1wSJwj"><ix:nonNumeric contextRef="From2021-01-01to2021-06-30" format="ixt:booleanfalse" name="dei:EntityShellCompany">No</ix:nonNumeric></span></span><span style="font: 10pt Times New Roman, Times, Serif">&#160;&#9746;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">As
of August 11, 2021, the Registrant had <span id="xdx_902_edei--EntityCommonStockSharesOutstanding_iI_pid_c20210811_zcGFJLsMQU91"><ix:nonFraction name="dei:EntityCommonStockSharesOutstanding" contextRef="AsOf2021-08-11" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">86,557,736</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">shares of common stock, $0.01 par value per share,
outstanding.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"></p>

<!-- Field: Rule-Page --><div style="width: 100%"><div style="border-top: Black 1.5pt solid; font-size: 1pt; border-bottom: Black 4pt solid"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></div></div><!-- Field: /Rule-Page -->

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"></p>


<!-- Field: Page; Sequence: 1 -->
    <div style="border-bottom: Black 1.5pt solid; margin-bottom: 6pt"><table cellpadding="0" cellspacing="0" style="border-collapse: collapse; width: 100%; font-size: 10pt"><tr style="vertical-align: top; text-align: left"><td style="width: 100%">&#160;</td></tr></table></div>
    <div style="break-before: page; margin-top: 6pt"><table cellpadding="0" cellspacing="0" style="border-collapse: collapse; width: 100%; font-size: 10pt"><tr style="vertical-align: top; text-align: left"><td style="text-align: center; width: 100%">&#160;</td></tr></table></div>
    <!-- Field: /Page -->

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>CELSION
CORPORATION</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>QUARTERLY
REPORT ON</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>FORM
10-Q</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>TABLE
OF CONTENTS</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<table cellspacing="0" cellpadding="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; width: 0.6in"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: black 1.5pt solid; font: 10pt Times New Roman, Times, Serif; width: 0.5in; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>Page(s)</b></span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top; background-color: rgb(204,238,255)">
    <td colspan="2" style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif"><a href="#cr_001"><span style="font-size: 10pt"><b>PART
    I: FINANCIAL INFORMATION</b></span></a></span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif">Item
    1.</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif"><a href="#cr_002"><span style="font-size: 10pt">Financial
    Statements (Unaudited)</span></a></span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">1</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif"><a href="#cr_003"><span style="font-size: 10pt">Condensed
    Consolidated Balance Sheets</span></a></span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">1</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif"><a href="#cr_004"><span style="font-size: 10pt">Condensed
    Consolidated Statements of Operations</span></a></span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">3</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif"><a href="#cr_005"><span style="font-size: 10pt">Condensed
    Consolidated Statements of Comprehensive Loss</span></a></span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">4</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif"><a href="#cr_006"><span style="font-size: 10pt">Condensed
    Consolidated Statements of Cash Flows</span></a></span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">5</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif"><a href="#cr_007"><span style="font-size: 10pt">Condensed
    Consolidated Statements of Changes in Stockholders&#8217; Equity</span></a></span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">7</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif"><a href="#cr_008"><span style="font-size: 10pt">Notes
    to the Condensed Consolidated Financial Statements</span></a></span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">9</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif">Item
    2.</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif"><a href="#cr_009"><span style="font-size: 10pt">Management&#8217;s
    Discussion and Analysis of Financial Condition and Results of Operations</span></a></span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">25</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif">Item
    3.</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif"><a href="#cr_010"><span style="font-size: 10pt">Quantitative
    and Qualitative Disclosures about Market Risk</span></a></span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">41</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif">Item
    4.</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif"><a href="#cr_011"><span style="font-size: 10pt">Controls
    and Procedures</span></a></span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">41</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top; background-color: rgb(204,238,255)">
    <td colspan="2" style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif"><a href="#cr_012"><span style="font-size: 10pt"><b>PART
    II: OTHER INFORMATION</b></span></a></span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif">Item
    1.</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif"><a href="#cr_013"><span style="font-size: 10pt">Legal
    Proceedings</span></a></span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">42</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif">Item
    1A.</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif"><a href="#cr_014"><span style="font-size: 10pt">Risk
    Factors</span></a></span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">42</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif">Item
    2.</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif"><a href="#cr_015"><span style="font-size: 10pt">Unregistered
    Sales of Equity Securities and Use of Proceeds</span></a></span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">42</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif">Item
    3.</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif"><a href="#cr_016"><span style="font-size: 10pt">Defaults
    Upon Senior Securities</span></a></span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">42</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif">Item
    4.</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif"><a href="#cr_017"><span style="font-size: 10pt">Mine
    Safety Disclosures</span></a></span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">42</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif">Item
    5.</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif"><a href="#cr_018"><span style="font-size: 10pt">Other
    Information</span></a></span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">42</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif">Item
    6.</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif"><a href="#cr_019"><span style="font-size: 10pt">Exhibits</span></a></span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">42</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top; background-color: rgb(204,238,255)">
    <td colspan="2" style="font: 10pt Times New Roman, Times, Serif"><span style="font-family: Times New Roman, Times, Serif"><a href="#cr_020"><span style="font-size: 10pt"><b>SIGNATURES</b></span></a></span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">43</span></td></tr>
  </table>
<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>


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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><b>Cautionary
Note Regarding Forward-Looking Statements</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">This
report includes &#8220;forward-looking statements&#8221; within the meaning of Section 27A of the Securities Act of 1933, as amended
(the &#8220;Securities Act&#8221;), and Section 21E of the Securities Exchange Act of 1934, as amended (the &#8220;Exchange Act&#8221;).
All statements other than statements of historical fact are &#8220;forward-looking statements&#8221; for purposes of this Quarterly Report
on Form 10-Q, including, without limitation, any projections of earnings, revenue or other financial items, any statements of the plans
and objectives of management for future operations (including, but not limited to, pre-clinical development, clinical trials, manufacturing
and commercialization), uncertainties and assumptions regarding the impact of the COVID-19 pandemic on our business, operations, clinical
trials, supply chain, strategy, goals and anticipated timelines, any statements concerning proposed drug candidates, potential therapeutic
benefits, or other new products or services, any statements regarding future economic conditions or performance, any changes in the course
of research and development activities and in clinical trials, any possible changes in cost and timing of development and testing, capital
structure, financial condition, working capital needs and other financial items, and any statements of assumptions underlying any of
the foregoing. In some cases, forward-looking statements can be identified by the use of terminology such as &#8220;may,&#8221; &#8220;will,&#8221;
&#8220;expects,&#8221; &#8220;plans,&#8221; &#8220;anticipates,&#8221; &#8220;estimates,&#8221; &#8220;potential&#8221; or &#8220;continue,&#8221;
or the negative thereof or other comparable terminology. Although we believe that our expectations are based on reasonable assumptions
within the bounds of our knowledge of our industry, business, and operations, we cannot guarantee that actual results will not differ
materially from our expectations.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Our
future financial condition and results of operations, as well as any forward-looking statements, are subject to inherent risks and uncertainties,
including, but not limited to, the inherent uncertainty in the drug development process, our ability to raise additional capital to fund
our planned future operations, our ability to obtain or maintain FDA and foreign regulatory approvals for our drug candidates, potential
impact of the outbreak, duration and severity of the COVID-19 pandemic on our business, our ability to enroll patients in our clinical
trials, risks relating to third parties conduct of our clinical trials, risks relating to government, private health insurers and other
third-party payers coverage or reimbursement, risks relating to commercial potential of a drug candidate in development, changes in technologies
for the treatment of cancer, impact of development of competitive drug candidates by others, risks relating to intellectual property,
volatility in the market price of our common stock, potential inability to maintain compliance with The Nasdaq Marketplace Rules and
the impact of adverse capital and credit market conditions. These and other risks, assumptions are described in Item 1A. Risk Factors
in our Annual Report on Form 10-K for the fiscal year ended December 31, 2020 and in other documents that we file or furnish with the
SEC. Should one or more of these risks or uncertainties materialize, or should underlying assumptions prove incorrect, actual results
may vary materially from those indicated or anticipated by such forward-looking statements. All forward-looking statements speak only
as of the date they are made and we do not intend to update any forward-looking statements, except as required by law or applicable regulations.
We operate in a highly competitive, highly regulated, and rapidly changing environment and our business is in a state of evolution. Therefore,
it is likely that new risks will emerge, and that the nature and elements of existing risks will change, over time. It is not possible
for management to predict all such risk factors or changes therein, or to assess either the impact of all such risk factors on our business
or the extent to which any individual risk factor, combination of factors, or new or altered factors, may cause results to differ materially
from those contained in any forward-looking statement.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Except
where the context otherwise requires, in this Quarterly Report on Form 10-Q, the &#8220;Company,&#8221; &#8220;Celsion,&#8221; &#8220;we,&#8221;
&#8220;us,&#8221; and &#8220;our&#8221; refer to Celsion Corporation, a Delaware corporation and its wholly owned subsidiary CLSN Laboratories,
Inc., also a Delaware corporation.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><b>Trademarks</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">The
Celsion brand and product names, including but not limited to Celsion<sup>&#174;</sup> and ThermoDox<sup>&#174;</sup> contained in this
document are trademarks, registered trademarks or service marks of Celsion Corporation or its subsidiary in the United States (&#8220;U.S.&#8221;)
and certain other countries. This document also contains references to trademarks and service marks of other companies that are the property
of their respective owners.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>


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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b><span id="cr_001"></span>PART
I: FINANCIAL INFORMATION</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><b><span id="cr_002"></span>Item
1. FINANCIAL STATEMENTS</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>CELSION
CORPORATION</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b><span id="cr_003"></span>CONDENSED
CONSOLIDATED</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>BALANCE
SHEETS</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<table cellpadding="0" cellspacing="0" id="xdx_302_111_zqoiptZjOGu8" summary="xdx: Statement - Condensed Consolidated Balance Sheets" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="vertical-align: bottom">
    <td style="text-align: center"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" id="xdx_49D_20210630_zeDUqZhQ6NL5" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">June
    30, 2021</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" id="xdx_49E_20201231_zSn4RQj1ZHIi" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">December
    31, 2020</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom">
    <td style="text-align: center"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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    <td colspan="2" style="font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_40D_eus-gaap--AssetsAbstract_iB_zmtE1Bi3xa0k" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">ASSETS</span></td><td style="font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_408_eus-gaap--AssetsCurrentAbstract_i01B_zwRdVc447No6" style="vertical-align: bottom; background-color: White">
    <td style="font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">Current assets:</span></td><td style="font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_400_eus-gaap--CashAndCashEquivalentsAtCarryingValue_i02I_maCzKE8_zc9NVZ36Zsyk" style="vertical-align: bottom; background-color: rgb(204,238,255)">
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    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td style="width: 16%; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:CashAndCashEquivalentsAtCarryingValue" contextRef="AsOf2020-12-31" format="ixt:numdotdecimal" decimals="0" unitRef="USD">17,164,177</ix:nonFraction></span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_408_eus-gaap--AvailableForSaleSecuritiesDebtSecuritiesCurrent_i02I_maCzKE8_zNOve9eT4W78" style="vertical-align: bottom; background-color: White">
    <td style="padding-left: 10pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">Investment in debt securities
    - available for sale, at fair value</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:AvailableForSaleSecuritiesDebtSecuritiesCurrent" contextRef="AsOf2021-06-30" format="ixt:numdotdecimal" decimals="0" unitRef="USD">31,923,285</ix:nonFraction></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0050">&#8211;</span></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_40A_eus-gaap--DebtSecuritiesHeldToMaturityAccruedInterestAfterAllowanceForCreditLoss_i02I_maCzKE8_zKxJ5pawQ4o8" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="padding-left: 10pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">Accrued interest on investment
    in debt securities</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:DebtSecuritiesHeldToMaturityAccruedInterestAfterAllowanceForCreditLoss" contextRef="AsOf2021-06-30" format="ixt:numdotdecimal" decimals="0" unitRef="USD">105,000</ix:nonFraction></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0053">&#8211;</span></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_40B_eus-gaap--GrantsReceivableCurrent_i02I_maCzKE8_zJNeOiPLqiFa" style="vertical-align: bottom; background-color: White">
    <td style="padding-left: 10pt; text-align: left; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">Advances
    and deposits on clinical programs and other current assets</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:GrantsReceivableCurrent" contextRef="AsOf2021-06-30" format="ixt:numdotdecimal" decimals="0" unitRef="USD">1,844,451</ix:nonFraction></span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:GrantsReceivableCurrent" contextRef="AsOf2020-12-31" format="ixt:numdotdecimal" decimals="0" unitRef="USD">1,660,695</ix:nonFraction></span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_40E_eus-gaap--AssetsCurrent_i02TI_mtCzKE8_maAzoHg_zJIWWnkkgmqf" style="vertical-align: bottom; background-color: White">
    <td style="font-weight: bold; text-align: justify; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">Total
    current assets</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:AssetsCurrent" contextRef="AsOf2021-06-30" format="ixt:numdotdecimal" decimals="0" unitRef="USD">60,310,160</ix:nonFraction></span></td><td style="padding-bottom: 1.5pt; font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:AssetsCurrent" contextRef="AsOf2020-12-31" format="ixt:numdotdecimal" decimals="0" unitRef="USD">18,824,872</ix:nonFraction></span></td><td style="padding-bottom: 1.5pt; font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_40D_eus-gaap--PropertyPlantAndEquipmentNet_i01I_maAzoHg_ztGjMfmRJERh" style="vertical-align: bottom; background-color: White">
    <td style="font-weight: bold; text-align: left; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">Property
    and equipment (at cost, less accumulated depreciation and amortization)</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:PropertyPlantAndEquipmentNet" contextRef="AsOf2021-06-30" format="ixt:numdotdecimal" decimals="0" unitRef="USD">458,551</ix:nonFraction></span></td><td style="padding-bottom: 1.5pt; font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:PropertyPlantAndEquipmentNet" contextRef="AsOf2020-12-31" format="ixt:numdotdecimal" decimals="0" unitRef="USD">294,551</ix:nonFraction></span></td><td style="padding-bottom: 1.5pt; font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_408_eus-gaap--OtherAssetsAbstract_i01B_zzmiBjb0jxeb" style="vertical-align: bottom; background-color: White">
    <td style="font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">Other assets:</span></td><td style="font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_401_eus-gaap--OtherLongTermInvestments_i02I_maOANzRJW_zkcBv9bFy4E9" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="padding-left: 10pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">Money market investments,
    restricted cash</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:OtherLongTermInvestments" contextRef="AsOf2021-06-30" format="ixt:numdotdecimal" decimals="0" unitRef="USD">6,000,000</ix:nonFraction></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0068">&#8211;</span></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_40B_eus-gaap--DeferredIncomeTaxAssetsNet_i02I_maOANzRJW_zGzbub100cCc" style="vertical-align: bottom; background-color: White">
    <td style="padding-left: 10pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">Deferred income tax asset</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0070">&#8211;</span></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:DeferredIncomeTaxAssetsNet" contextRef="AsOf2020-12-31" format="ixt:numdotdecimal" decimals="0" unitRef="USD">1,845,823</ix:nonFraction></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_40C_eus-gaap--IndefiniteLivedIntangibleAssetsExcludingGoodwill_i02I_maOANzRJW_z9RMKfWLUej7" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="padding-left: 10pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">In-process research and
    development, net</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill" contextRef="AsOf2021-06-30" format="ixt:numdotdecimal" decimals="0" unitRef="USD">13,366,234</ix:nonFraction></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill" contextRef="AsOf2020-12-31" format="ixt:numdotdecimal" decimals="0" unitRef="USD">13,366,234</ix:nonFraction></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_40C_eus-gaap--Goodwill_i02I_maOANzRJW_zN0Owooik53h" style="vertical-align: bottom; background-color: White">
    <td style="padding-left: 10pt"><span style="font-family: Times New Roman, Times, Serif">Goodwill</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:Goodwill" contextRef="AsOf2021-06-30" format="ixt:numdotdecimal" decimals="0" unitRef="USD">1,976,101</ix:nonFraction></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:Goodwill" contextRef="AsOf2020-12-31" format="ixt:numdotdecimal" decimals="0" unitRef="USD">1,976,101</ix:nonFraction></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_409_eus-gaap--OperatingLeaseRightOfUseAsset_i02I_maOANzRJW_zOYHhPHdgiB2" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="padding-left: 10pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">Operating lease right-of-use
    assets, net</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:OperatingLeaseRightOfUseAsset" contextRef="AsOf2021-06-30" format="ixt:numdotdecimal" decimals="0" unitRef="USD">840,195</ix:nonFraction></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:OperatingLeaseRightOfUseAsset" contextRef="AsOf2020-12-31" format="ixt:numdotdecimal" decimals="0" unitRef="USD">1,047,336</ix:nonFraction></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_40B_eus-gaap--FiniteLivedIntangibleAssetsNet_i02I_maOANzRJW_zSg0sdKZrZj" style="vertical-align: bottom; background-color: White">
    <td style="padding-left: 10pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">Other intangible assets,
    net</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:DepositsAssetsNoncurrent" contextRef="AsOf2021-06-30" format="ixt:numdotdecimal" decimals="0" unitRef="USD">58,761</ix:nonFraction></span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:DepositsAssetsNoncurrent" contextRef="AsOf2020-12-31" format="ixt:numdotdecimal" decimals="0" unitRef="USD">58,761</ix:nonFraction></span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
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  <tr style="vertical-align: bottom; background-color: White">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_40D_eus-gaap--Assets_i01TI_mtAzoHg_zzWJcpLBkXXc" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font-weight: bold; text-align: left; padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">Total
    assets</span></td><td style="font-weight: bold; padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td style="border-bottom: Black 2.5pt double; font-weight: bold; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:Assets" contextRef="AsOf2021-06-30" format="ixt:numdotdecimal" decimals="0" unitRef="USD">83,010,002</ix:nonFraction></span></td><td style="padding-bottom: 2.5pt; font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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  </table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>See
accompanying notes to the condensed consolidated financial statements</b>.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>


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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>CELSION
CORPORATION</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>CONDENSED
CONSOLIDATED</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>BALANCE
SHEETS</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>(Continued)</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<table cellpadding="0" cellspacing="0" summary="xdx: Statement - Condensed Consolidated Balance Sheets" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="vertical-align: bottom">
    <td style="text-align: center"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">June
    30, 2021</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">December
    31, 2020</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom">
    <td style="text-align: center"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">(Unaudited)</span></td><td style="font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="text-align: center"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_407_eus-gaap--LiabilitiesAndStockholdersEquityAbstract_iB_zbun7aqE9s97" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">LIABILITIES AND STOCKHOLDERS&#8217;
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    <td style="font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_402_eus-gaap--LiabilitiesCurrentAbstract_i01B_zSDIEoi022r9" style="vertical-align: bottom; background-color: White">
    <td style="font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">Current liabilities:</span></td><td style="font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_403_eus-gaap--AccountsPayableCurrent_i02I_maCzjZn_zGHt2k66BcFi" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="padding-left: 10pt; width: 60%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">Accounts payable
    &#8211; trade</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td style="width: 16%; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:AccountsPayableCurrent" contextRef="AsOf2021-06-30" format="ixt:numdotdecimal" decimals="0" unitRef="USD">2,109,479</ix:nonFraction></span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td style="width: 16%; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:AccountsPayableCurrent" contextRef="AsOf2020-12-31" format="ixt:numdotdecimal" decimals="0" unitRef="USD">2,244,847</ix:nonFraction></span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_407_eus-gaap--AccruedLiabilitiesCurrent_i02I_maCzjZn_zb0GmXf6vPRg" style="vertical-align: bottom; background-color: White">
    <td style="padding-left: 10pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">Other accrued liabilities</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:AccruedLiabilitiesCurrent" contextRef="AsOf2021-06-30" format="ixt:numdotdecimal" decimals="0" unitRef="USD">2,312,705</ix:nonFraction></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:AccruedLiabilitiesCurrent" contextRef="AsOf2020-12-31" format="ixt:numdotdecimal" decimals="0" unitRef="USD">2,458,532</ix:nonFraction></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_409_eus-gaap--NotesPayableCurrent_i02I_maCzjZn_zLAeO1Jm36Ti" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="padding-left: 10pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">Notes payable &#8211; current
    portion, net of deferred financing costs</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0106">&#8211;</span></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:NotesPayableCurrent" contextRef="AsOf2020-12-31" format="ixt:numdotdecimal" decimals="0" unitRef="USD">1,116,663</ix:nonFraction></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_401_eus-gaap--OperatingLeaseLiabilityCurrent_i02I_maCzjZn_z8A3rBh9jZBf" style="vertical-align: bottom; background-color: White">
    <td style="padding-left: 10pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">Operating lease liability
    - current portion</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:OperatingLeaseLiabilityCurrent" contextRef="AsOf2021-06-30" format="ixt:numdotdecimal" decimals="0" unitRef="USD">458,168</ix:nonFraction></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:OperatingLeaseLiabilityCurrent" contextRef="AsOf2020-12-31" format="ixt:numdotdecimal" decimals="0" unitRef="USD">433,413</ix:nonFraction></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
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    <td style="padding-left: 10pt; text-align: left; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">Deferred
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    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:ContractWithCustomerLiabilityCurrent" contextRef="AsOf2021-06-30" format="ixt:numdotdecimal" decimals="0" unitRef="USD">500,000</ix:nonFraction></span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:ContractWithCustomerLiabilityCurrent" contextRef="AsOf2020-12-31" format="ixt:numdotdecimal" decimals="0" unitRef="USD">500,000</ix:nonFraction></span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_407_eus-gaap--LiabilitiesCurrent_i02TI_mtCzjZn_maCzsOM_zNIosR36eMW" style="vertical-align: bottom; background-color: White">
    <td style="font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">Total current liabilities</span></td><td style="font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:LiabilitiesCurrent" contextRef="AsOf2021-06-30" format="ixt:numdotdecimal" decimals="0" unitRef="USD">5,380,352</ix:nonFraction></span></td><td style="font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:LiabilitiesCurrent" contextRef="AsOf2020-12-31" format="ixt:numdotdecimal" decimals="0" unitRef="USD">6,753,455</ix:nonFraction></span></td><td style="font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
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    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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  <tr id="xdx_407_eus-gaap--BusinessCombinationContingentConsiderationLiabilityNoncurrent_i01I_maCzsOM_zJrfKvw5jGPd" style="vertical-align: bottom; background-color: White">
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  <tr id="xdx_406_eus-gaap--LongTermNotesPayable_i01I_maCzsOM_zh0EE1cKqly7" style="vertical-align: bottom; background-color: rgb(204,238,255)">
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  <tr id="xdx_405_eus-gaap--OperatingLeaseLiabilityNoncurrent_i01I_maCzsOM_zEyWr1d6sjZ2" style="vertical-align: bottom; background-color: White">
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  <tr id="xdx_401_eus-gaap--DeferredRevenueNoncurrent_i01I_maCzsOM_zmVwR6U22s9g" style="vertical-align: bottom; background-color: rgb(204,238,255)">
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  <tr id="xdx_40C_eus-gaap--Liabilities_i01TI_mtCzsOM_maCzrEz_zWjNl7OUvfUd" style="vertical-align: bottom; background-color: White">
    <td style="font-weight: bold; text-align: left; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">Total
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    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_408_eus-gaap--CommitmentsAndContingencies_i01I_maCzrEz_zKbXYa8LqiT2" style="vertical-align: bottom; background-color: White">
    <td style="font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">Commitments and contingencies</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0134">&#8211;</span></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_40B_eus-gaap--StockholdersEquityAbstract_i01B_z5GTwsW02zQ3" style="vertical-align: bottom; background-color: White">
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    <td style="font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_40D_eus-gaap--PreferredStockValue_i02I_maCzgyS_zQMuoWzPmPtc" style="vertical-align: bottom; background-color: White">
    <td style="padding-left: 10pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">Preferred Stock - $<span id="xdx_90F_eus-gaap--PreferredStockParOrStatedValuePerShare_iI_c20210630_z4H8uRfNoTL1" title="Preferred stock, par value"><span id="xdx_908_eus-gaap--PreferredStockParOrStatedValuePerShare_iI_c20201231_zkcXQYaSE7e2" title="Preferred stock, par value"><ix:nonFraction name="us-gaap:PreferredStockParOrStatedValuePerShare" contextRef="AsOf2021-06-30" format="ixt:numdotdecimal" decimals="INF" unitRef="USDPShares"><ix:nonFraction name="us-gaap:PreferredStockParOrStatedValuePerShare" contextRef="AsOf2020-12-31" format="ixt:numdotdecimal" decimals="INF" unitRef="USDPShares">0.01</ix:nonFraction></ix:nonFraction></span>
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    </span></span><span style="font-family: Times New Roman, Times, Serif">shares issued or outstanding at June 30, 2021 and December
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    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0139">&#8211;</span></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0140">&#8211;</span></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_40A_eus-gaap--CommonStockValue_i02I_maCzgyS_zWz2WJRkbD7a" style="vertical-align: bottom; background-color: White">
    <td style="padding-left: 10pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">Common stock - $<span id="xdx_907_eus-gaap--CommonStockParOrStatedValuePerShare_iI_c20210630_zjBtrRzkJshk" title="Common stock, par value"><span id="xdx_908_eus-gaap--CommonStockParOrStatedValuePerShare_iI_c20201231_zwmxmZ3r5Yz8" title="Common stock, par value"><ix:nonFraction name="us-gaap:CommonStockParOrStatedValuePerShare" contextRef="AsOf2021-06-30" format="ixt:numdotdecimal" decimals="INF" unitRef="USDPShares"><ix:nonFraction name="us-gaap:CommonStockParOrStatedValuePerShare" contextRef="AsOf2020-12-31" format="ixt:numdotdecimal" decimals="INF" unitRef="USDPShares">0.01</ix:nonFraction></ix:nonFraction></span>
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    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:CommonStockValue" contextRef="AsOf2021-06-30" format="ixt:numdotdecimal" decimals="0" unitRef="USD">865,581</ix:nonFraction></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:CommonStockValue" contextRef="AsOf2020-12-31" format="ixt:numdotdecimal" decimals="0" unitRef="USD">407,014</ix:nonFraction></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_40C_eus-gaap--AdditionalPaidInCapital_i02I_maCzgyS_zQw39oIXbrs1" style="vertical-align: bottom; background-color: rgb(204,238,255)">
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    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:AdditionalPaidInCapital" contextRef="AsOf2020-12-31" format="ixt:numdotdecimal" decimals="0" unitRef="USD">330,289,596</ix:nonFraction></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_400_eus-gaap--AccumulatedOtherComprehensiveIncomeLossNetOfTax_i02I_pp0p0_maCzgyS_zucSLN7BoAoc" style="vertical-align: bottom; background-color: White">
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  <tr id="xdx_40E_eus-gaap--RetainedEarningsAccumulatedDeficit_i02I_maCzgyS_z7YMuO6URxW" style="vertical-align: bottom; background-color: rgb(204,238,255)">
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    deficit</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif">(<ix:nonFraction name="us-gaap:RetainedEarningsAccumulatedDeficit" contextRef="AsOf2020-12-31" format="ixt:numdotdecimal" decimals="0" sign="-" unitRef="USD">312,000,341</ix:nonFraction></span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">)</span></td></tr>
  <tr id="xdx_400_eus-gaap--StockholdersEquityBeforeTreasuryStock_i02TI_mtCzgyS_maCzTTN_zCfBoX84SuWd" style="vertical-align: bottom; background-color: White">
    <td style="font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">Total stockholders&#8217;
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    <td style="font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:StockholdersEquityBeforeTreasuryStock" contextRef="AsOf2020-12-31" format="ixt:numdotdecimal" decimals="0" unitRef="USD">18,696,269</ix:nonFraction></span></td><td style="font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_401_eus-gaap--TreasuryStockValue_i02NI_pp0p0_di_msCzTTN_zysXYeafNlvc" style="vertical-align: bottom; background-color: White">
    <td style="padding-left: 10pt; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">Treasury stock, at
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    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif">(<ix:nonFraction name="us-gaap:TreasuryStockValue" contextRef="AsOf2021-06-30" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">85,188</ix:nonFraction></span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">)</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif">(<ix:nonFraction name="us-gaap:TreasuryStockValue" contextRef="AsOf2020-12-31" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">85,188</ix:nonFraction></span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">)</span></td></tr>
  <tr id="xdx_40C_eus-gaap--StockholdersEquity_i02TI_mtCzTTN_maCzrEz_zKvfzipDnBoi" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font-weight: bold; text-align: left; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">Total
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    <td style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:StockholdersEquity" contextRef="AsOf2021-06-30" format="ixt:numdotdecimal" decimals="0" unitRef="USD">64,053,512</ix:nonFraction></span></td><td style="padding-bottom: 1.5pt; font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:StockholdersEquity" contextRef="AsOf2020-12-31" format="ixt:numdotdecimal" decimals="0" unitRef="USD">18,611,081</ix:nonFraction></span></td><td style="padding-bottom: 1.5pt; font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_407_eus-gaap--LiabilitiesAndStockholdersEquity_i01TI_mtCzrEz_zO3fgJld7CF7" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font-weight: bold; text-align: left; padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">Total
    liabilities and stockholders&#8217; equity</span></td><td style="font-weight: bold; padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td style="border-bottom: Black 2.5pt double; font-weight: bold; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:LiabilitiesAndStockholdersEquity" contextRef="AsOf2021-06-30" format="ixt:numdotdecimal" decimals="0" unitRef="USD">83,010,002</ix:nonFraction></span></td><td style="padding-bottom: 2.5pt; font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td style="border-bottom: Black 2.5pt double; font-weight: bold; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:LiabilitiesAndStockholdersEquity" contextRef="AsOf2020-12-31" format="ixt:numdotdecimal" decimals="0" unitRef="USD">37,527,338</ix:nonFraction></span></td><td style="padding-bottom: 2.5pt; font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  </table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>See
accompanying notes to the condensed consolidated financial statements</b>.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>


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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>CELSION
CORPORATION</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b><span id="cr_004"></span>CONDENSED
CONSOLIDATED</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>STATEMENTS
OF OPERATIONS</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>(Unaudited)</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>&#160;</b></span></p>

<table cellpadding="0" cellspacing="0" id="xdx_30E_113_zi1z2SB1ja1k" summary="xdx: Statement - Condensed Consolidated Statements of Operations (Unaudited)" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="display: none; vertical-align: bottom">
    <td style="text-align: center"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" id="xdx_497_20210401__20210630_zX1svwQ9nXf9" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">2021</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" id="xdx_49B_20200401__20200630_zTFvzzzRw2e" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">2020</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" id="xdx_49F_20210101__20210630_zLPGom1MTb0k" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">2021</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" id="xdx_49C_20200101__20200630_zGhChCMWFHbk" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">2020</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
<tr style="vertical-align: bottom">
    <td style="text-align: center"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="6" style="border-bottom: Black 1.5pt solid; text-align: center"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>Three
                                            Months Ended</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>June
                                            30,</b></span></p></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="6" style="border-bottom: Black 1.5pt solid; text-align: center"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>Six
                                            Months Ended</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>June
                                            30,</b></span></p></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom">
    <td style="text-align: center"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">2021</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">2020</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">2021</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">2020</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_403_eus-gaap--RevenueFromContractWithCustomerExcludingAssessedTax_maCzhat_z4u0hrd3PLj5" style="vertical-align: bottom; background-color: rgb(204,238,255)">
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  <tr id="xdx_40A_eus-gaap--OperatingExpensesAbstract_iB_zwzxStfueNce" style="vertical-align: bottom; background-color: rgb(204,238,255)">
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    <td style="font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_406_eus-gaap--ResearchAndDevelopmentExpense_i01_maCzumy_z3K1vN4AxUh4" style="vertical-align: bottom; background-color: White">
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    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:ResearchAndDevelopmentExpense" contextRef="From2020-01-012020-06-30" format="ixt:numdotdecimal" decimals="0" unitRef="USD">6,042,910</ix:nonFraction></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
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    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:GeneralAndAdministrativeExpense" contextRef="From2020-04-012020-06-30" format="ixt:numdotdecimal" decimals="0" unitRef="USD">1,901,136</ix:nonFraction></span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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  <tr id="xdx_40D_eus-gaap--OperatingExpenses_i01T_mtCzumy_msCzhat_zt51qptA4DW4" style="vertical-align: bottom; background-color: White">
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    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:OperatingExpenses" contextRef="From2020-01-012020-06-30" format="ixt:numdotdecimal" decimals="0" unitRef="USD">9,782,952</ix:nonFraction></span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
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    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_40C_eus-gaap--OperatingIncomeLoss_iT_mtCzhat_maCz7lJ_zaoZ9EKFRHAl" style="vertical-align: bottom; background-color: White">
    <td style="font-weight: bold; text-align: left; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">Loss
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    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif">(<ix:nonFraction name="us-gaap:OperatingIncomeLoss" contextRef="From2020-04-012020-06-30" format="ixt:numdotdecimal" decimals="0" sign="-" unitRef="USD">4,766,997</ix:nonFraction></span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">)</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_40D_eus-gaap--OtherIncomeAndExpensesAbstract_iB" style="vertical-align: bottom; background-color: White">
    <td style="font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">Other (expense) income:</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
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    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">(<ix:nonFraction name="CLSN:GainLossFromChangeInEarnoutMilestoneLiability" contextRef="From2020-04-012020-06-30" format="ixt:numdotdecimal" decimals="0" scale="0" sign="-" unitRef="USD">256,296</ix:nonFraction></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">)</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">(<ix:nonFraction name="CLSN:GainLossFromChangeInEarnoutMilestoneLiability" contextRef="From2021-01-01to2021-06-30" format="ixt:numdotdecimal" decimals="0" scale="0" sign="-" unitRef="USD">70,000</ix:nonFraction></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">)</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">(<ix:nonFraction name="CLSN:GainLossFromChangeInEarnoutMilestoneLiability" contextRef="From2020-01-012020-06-30" format="ixt:numdotdecimal" decimals="0" scale="0" sign="-" unitRef="USD">297,570</ix:nonFraction></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">)</span></td></tr>
  <tr id="xdx_407_ecustom--InvestmentIncomeLossNonoperating_i01_maCz1pM_zG0CThvYpJpg" style="vertical-align: bottom; background-color: White">
    <td style="padding-left: 10pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">Investment income</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">(<ix:nonFraction name="CLSN:InvestmentIncomeLossNonoperating" contextRef="From2021-04-012021-06-30" format="ixt:numdotdecimal" decimals="0" sign="-" unitRef="USD">349</ix:nonFraction></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">)</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="CLSN:InvestmentIncomeLossNonoperating" contextRef="From2020-04-012020-06-30" format="ixt:numdotdecimal" decimals="0" unitRef="USD">20,960</ix:nonFraction></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="CLSN:InvestmentIncomeLossNonoperating" contextRef="From2021-01-01to2021-06-30" format="ixt:numdotdecimal" decimals="0" unitRef="USD">2,062</ix:nonFraction></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="CLSN:InvestmentIncomeLossNonoperating" contextRef="From2020-01-012020-06-30" format="ixt:numdotdecimal" decimals="0" unitRef="USD">109,269</ix:nonFraction></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_40F_eus-gaap--InterestAndDebtExpense_i01N_di_msCz1pM_zGyxKnnawbU1" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="padding-left: 10pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">Interest expense</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">(<ix:nonFraction name="us-gaap:InterestAndDebtExpense" contextRef="From2021-04-012021-06-30" format="ixt:numdotdecimal" decimals="0" unitRef="USD">221,227</ix:nonFraction></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">)</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">(<ix:nonFraction name="us-gaap:InterestAndDebtExpense" contextRef="From2020-04-012020-06-30" format="ixt:numdotdecimal" decimals="0" unitRef="USD">340,602</ix:nonFraction></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">)</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">(<ix:nonFraction name="us-gaap:InterestAndDebtExpense" contextRef="From2021-01-01to2021-06-30" format="ixt:numdotdecimal" decimals="0" unitRef="USD">378,841</ix:nonFraction></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">)</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">(<ix:nonFraction name="us-gaap:InterestAndDebtExpense" contextRef="From2020-01-012020-06-30" format="ixt:numdotdecimal" decimals="0" unitRef="USD">679,967</ix:nonFraction></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">)</span></td></tr>
  <tr id="xdx_409_ecustom--RecognizedGainsLossesOnExtinguishmentOfDebtNonoperating_i01_maCz1pM_zh65OzWW4EVj" style="vertical-align: bottom; background-color: White">
    <td style="padding-left: 10pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">Recognized loss on extinguishment
    of debt</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">(<ix:nonFraction name="CLSN:RecognizedGainsLossesOnExtinguishmentOfDebtNonoperating" contextRef="From2021-04-012021-06-30" format="ixt:numdotdecimal" decimals="0" sign="-" unitRef="USD">234,419</ix:nonFraction></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">)</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font: 10pt Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0253">&#8211;</span></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">(<ix:nonFraction name="CLSN:RecognizedGainsLossesOnExtinguishmentOfDebtNonoperating" contextRef="From2021-01-01to2021-06-30" format="ixt:numdotdecimal" decimals="0" sign="-" unitRef="USD">234,419</ix:nonFraction></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">)</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font: 10pt Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0255">&#8211;</span></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_403_eus-gaap--OtherNonoperatingIncomeExpense_i01_pp0p0_maCz1pM_znmhWpBEw3v6" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="padding-left: 10pt; text-align: left; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">Other
    (expense) income</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif">(<ix:nonFraction name="us-gaap:OtherNonoperatingIncomeExpense" contextRef="From2021-04-012021-06-30" format="ixt:numdotdecimal" decimals="0" scale="0" sign="-" unitRef="USD">2,000</ix:nonFraction></span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">)</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font: 10pt Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0258">&#8211;</span></span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif">(<ix:nonFraction name="us-gaap:OtherNonoperatingIncomeExpense" contextRef="From2021-01-01to2021-06-30" format="ixt:numdotdecimal" decimals="0" scale="0" sign="-" unitRef="USD">1,456</ix:nonFraction></span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">)</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:OtherNonoperatingIncomeExpense" contextRef="From2020-01-012020-06-30" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">1,407</ix:nonFraction></span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_403_eus-gaap--NonoperatingIncomeExpense_i01T_pp0p0_mtCz1pM_maCz7lJ_zFowFXzk8qi6" style="vertical-align: bottom; background-color: White">
    <td style="padding-left: 20pt; font-weight: bold; text-align: left; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">Total
    other (expense) income, net</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif">(<ix:nonFraction name="us-gaap:NonoperatingIncomeExpense" contextRef="From2020-04-012020-06-30" format="ixt:numdotdecimal" decimals="0" scale="0" sign="-" unitRef="USD">575,938</ix:nonFraction></span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">)</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif">(<ix:nonFraction name="us-gaap:NonoperatingIncomeExpense" contextRef="From2021-01-01to2021-06-30" format="ixt:numdotdecimal" decimals="0" scale="0" sign="-" unitRef="USD">682,654</ix:nonFraction></span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">)</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif">(<ix:nonFraction name="us-gaap:NonoperatingIncomeExpense" contextRef="From2020-01-012020-06-30" format="ixt:numdotdecimal" decimals="0" scale="0" sign="-" unitRef="USD">866,861</ix:nonFraction></span></td><td style="padding-bottom: 1.5pt; text-align: left">)<span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_40E_eus-gaap--NetIncomeLoss_iT_mtCz7lJ_zZf25hQ8GCql" style="vertical-align: bottom; background-color: White">
    <td style="font-weight: bold; text-align: left; padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">Net
    loss</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td style="border-bottom: Black 2.5pt double; text-align: right"><span style="font-family: Times New Roman, Times, Serif">(<ix:nonFraction name="us-gaap:NetIncomeLoss" contextRef="From2021-04-012021-06-30" format="ixt:numdotdecimal" decimals="0" sign="-" unitRef="USD">5,448,397</ix:nonFraction></span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">)</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td style="border-bottom: Black 2.5pt double; text-align: right"><span style="font-family: Times New Roman, Times, Serif">(<ix:nonFraction name="us-gaap:NetIncomeLoss" contextRef="From2020-04-012020-06-30" format="ixt:numdotdecimal" decimals="0" sign="-" unitRef="USD">5,342,935</ix:nonFraction></span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">)</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td style="border-bottom: Black 2.5pt double; text-align: right"><span style="font-family: Times New Roman, Times, Serif">(<ix:nonFraction name="us-gaap:NetIncomeLoss" contextRef="From2021-01-01to2021-06-30" format="ixt:numdotdecimal" decimals="0" sign="-" unitRef="USD">11,137,400</ix:nonFraction></span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">)</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td style="border-bottom: Black 2.5pt double; text-align: right"><span style="font-family: Times New Roman, Times, Serif">(<ix:nonFraction name="us-gaap:NetIncomeLoss" contextRef="From2020-01-012020-06-30" format="ixt:numdotdecimal" decimals="0" sign="-" unitRef="USD">10,399,813</ix:nonFraction></span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">)</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td style="padding-left: 10pt; font-weight: bold; padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">Net
    loss per common share</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 2.5pt double; text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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  <tr id="xdx_406_eus-gaap--EarningsPerShareBasicAndDiluted_uUSDPShares_zDVz4l9bXtc" style="vertical-align: bottom; background-color: rgb(204,238,255)">
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    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
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    <td style="padding-left: 10pt; font-weight: bold; padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">Weighted
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    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 2.5pt double; text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 2.5pt double; text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_402_eus-gaap--WeightedAverageNumberOfShareOutstandingBasicAndDiluted_i_pdd" style="vertical-align: bottom; background-color: White">
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  </table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>See
accompanying notes to the condensed consolidated financial statements.</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>


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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>CELSION
CORPORATION</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b><span id="cr_005"></span>CONDENSED
CONSOLIDATED</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>STATEMENTS
OF COMPREHENSIVE LOSS</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>(Unaudited)</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>&#160;</b></span></p>

<table cellpadding="0" cellspacing="0" id="xdx_30D_113_zCXr3iUvPdg7" summary="xdx: Statement - Condensed Consolidated Statements of Comprehensive Loss (Unaudited)" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="display: none; vertical-align: bottom">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" id="xdx_49B_20210401__20210630_zRSTkXsVQvI6" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">2021</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" id="xdx_491_20200401__20200630_z0J8NA8EM0U3" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">2020</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" id="xdx_497_20210101__20210630_zD39iFOzzV29" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">2021</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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<tr style="vertical-align: bottom">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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                                            Months Ended</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>June
                                            30,</b></span></p></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="6" style="border-bottom: Black 1.5pt solid; text-align: center"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>Six
                                            Months Ended</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>June
                                            30,</b></span></p></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">2021</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">2020</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">2021</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">2020</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_407_eus-gaap--OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAbstract_iB" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">Other comprehensive (loss)
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    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_401_eus-gaap--OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParentAbstract_i01B" style="vertical-align: bottom; background-color: rgb(204,238,255)">
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    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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    <td style="text-align: left; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">Net loss</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
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  </table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>&#160;</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>See
accompanying notes to the condensed consolidated financial statements</b>.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>


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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>CELSION
CORPORATION</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b><span id="cr_006"></span>CONDENSED
CONSOLIDATED</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>STATEMENTS
OF CASH FLOWS</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>(Unaudited)</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<table cellpadding="0" cellspacing="0" id="xdx_305_112_zgUJPZPAKgQi" summary="xdx: Statement - Condensed Consolidated Statements of Cash Flows (Unaudited)" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="display: none; vertical-align: bottom">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" id="xdx_492_20210101__20210630_zHUozbm1Ubu5" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">2021</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" id="xdx_49D_20200101__20200630_zxvv6ivZJKic" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">2020</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
<tr style="vertical-align: bottom">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="6" style="border-bottom: Black 1.5pt solid; text-align: center"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>Six
                                            Months Ended</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>June
                                            30,</b></span></p></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">2021</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">2020</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_40D_eus-gaap--NetCashProvidedByUsedInOperatingActivitiesAbstract_iB" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">Cash flows from operating
    activities:</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_408_eus-gaap--NetIncomeLoss_i01_pp0p0_maNCPBUzcRI_z6ahYB3PhK3j" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="width: 60%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">Net loss</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td style="width: 16%; text-align: right"><span style="font-family: Times New Roman, Times, Serif">(<ix:nonFraction name="us-gaap:NetIncomeLoss" contextRef="From2021-01-01to2021-06-30" format="ixt:numdotdecimal" decimals="0" scale="0" sign="-" unitRef="USD">11,137,400</ix:nonFraction></span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">)</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td style="width: 16%; text-align: right"><span style="font-family: Times New Roman, Times, Serif">(<ix:nonFraction name="us-gaap:NetIncomeLoss" contextRef="From2020-01-012020-06-30" format="ixt:numdotdecimal" decimals="0" scale="0" sign="-" unitRef="USD">10,399,813</ix:nonFraction></span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">)</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_405_eus-gaap--AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_i01B" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">Adjustments to reconcile net loss to net cash
    used in operating activities:</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_406_eus-gaap--DepreciationDepletionAndAmortization_i02_pp0p0_maNCPBUzcRI_z3qKDpC3tCUj" style="vertical-align: bottom; background-color: White">
    <td style="text-align: left; padding-left: 10pt"><span style="font-family: Times New Roman, Times, Serif">Depreciation and amortization</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:DepreciationDepletionAndAmortization" contextRef="From2021-01-01to2021-06-30" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">383,801</ix:nonFraction></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:DepreciationDepletionAndAmortization" contextRef="From2020-01-012020-06-30" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">378,990</ix:nonFraction></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_403_ecustom--GainLossFromChangeInEarnoutMilestoneLiability_i02N_pp0p0_di_msNCPBUzcRI_zEJLQ6nzN8yi" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left; padding-left: 10pt"><span style="font-family: Times New Roman, Times, Serif">Change in fair value of
    earn-out milestone liability</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="CLSN:GainLossFromChangeInEarnoutMilestoneLiability" contextRef="From2021-01-01to2021-06-30" format="ixt:numdotdecimal" decimals="0" scale="0" sign="-" unitRef="USD">70,000</ix:nonFraction></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="CLSN:GainLossFromChangeInEarnoutMilestoneLiability" contextRef="From2020-01-012020-06-30" format="ixt:numdotdecimal" decimals="0" scale="0" sign="-" unitRef="USD">297,570</ix:nonFraction></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_40B_eus-gaap--ContractWithCustomerLiabilityRevenueRecognized_i02N_pp0p0_di_msNCPBUzcRI_z68ciErKdxzb" style="vertical-align: bottom; background-color: White">
    <td style="text-align: left; padding-left: 10pt"><span style="font-family: Times New Roman, Times, Serif">Recognition of deferred
    revenue</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">(<ix:nonFraction name="us-gaap:ContractWithCustomerLiabilityRevenueRecognized" contextRef="From2021-01-01to2021-06-30" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">250,000</ix:nonFraction></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">)</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">(<ix:nonFraction name="us-gaap:ContractWithCustomerLiabilityRevenueRecognized" contextRef="From2020-01-012020-06-30" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">250,000</ix:nonFraction></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">)</span></td></tr>
  <tr id="xdx_40A_eus-gaap--ShareBasedCompensation_i02_pp0p0_maNCPBUzcRI_zwtN7BDlvnIc" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left; padding-left: 10pt"><span style="font-family: Times New Roman, Times, Serif">Stock-based compensation
    costs</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:ShareBasedCompensation" contextRef="From2021-01-01to2021-06-30" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">2,372,945</ix:nonFraction></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:ShareBasedCompensation" contextRef="From2020-01-012020-06-30" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">1,030,726</ix:nonFraction></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_40D_eus-gaap--DeferredIncomeTaxExpenseBenefit_i02_pp0p0_maNCPBUzcRI_z6AkJGvORCL9" style="vertical-align: bottom; background-color: White">
    <td style="text-align: left; padding-left: 10pt"><span style="font-family: Times New Roman, Times, Serif">Deferred income tax asset</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:DeferredIncomeTaxExpenseBenefit" contextRef="From2021-01-01to2021-06-30" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">1,845,823</ix:nonFraction></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:DeferredIncomeTaxExpenseBenefit" contextRef="From2020-01-012020-06-30" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">1,819,324</ix:nonFraction></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_401_ecustom--AmortizationOfDeferredFinanceChargesAndDebtDiscountAssociatedWithNotePayable_i02_pp0p0_maNCPBUzcRI_z5miPgmRX9pc" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left; padding-left: 10pt"><span style="font-family: Times New Roman, Times, Serif">Amortization of deferred
    finance charges and debt discount associated with notes payable</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="CLSN:AmortizationOfDeferredFinanceChargesAndDebtDiscountAssociatedWithNotePayable" contextRef="From2021-01-01to2021-06-30" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">145,884</ix:nonFraction></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="CLSN:AmortizationOfDeferredFinanceChargesAndDebtDiscountAssociatedWithNotePayable" contextRef="From2020-01-012020-06-30" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">192,793</ix:nonFraction></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_40A_eus-gaap--IncreaseDecreaseInOperatingCapitalAbstract_i02B" style="vertical-align: bottom; background-color: White">
    <td style="text-align: left; padding-left: 10pt"><span style="font-family: Times New Roman, Times, Serif">Net changes in:</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_400_eus-gaap--IncreaseDecreaseInAccruedInvestmentIncomeReceivable_i03N_pp0p0_di_msNCPBUzcRI_zRYhSxJMMWo7" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left; padding-left: 20pt"><span style="font-family: Times New Roman, Times, Serif">Accrued interest on investment
    securities</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">(<ix:nonFraction name="us-gaap:IncreaseDecreaseInAccruedInvestmentIncomeReceivable" contextRef="From2021-01-01to2021-06-30" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">105,000</ix:nonFraction></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">)</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:IncreaseDecreaseInAccruedInvestmentIncomeReceivable" contextRef="From2020-01-012020-06-30" format="ixt:numdotdecimal" decimals="0" scale="0" sign="-" unitRef="USD">13,503</ix:nonFraction></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_403_eus-gaap--IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_i03N_pp0p0_di_msNCPBUzcRI_zBaCkx25T0f8" style="vertical-align: bottom; background-color: White">
    <td style="text-align: left; padding-left: 20pt"><span style="font-family: Times New Roman, Times, Serif">Advances, deposits, and
    other current assets</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">(<ix:nonFraction name="us-gaap:IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets" contextRef="From2021-01-01to2021-06-30" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">183,756</ix:nonFraction></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">)</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">(<ix:nonFraction name="us-gaap:IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets" contextRef="From2020-01-012020-06-30" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">60,104</ix:nonFraction></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">)</span></td></tr>
  <tr id="xdx_406_eus-gaap--IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_i03_pp0p0_maNCPBUzcRI_zMj2z39fYEo" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left; padding-bottom: 1.5pt; padding-left: 20pt"><span style="font-family: Times New Roman, Times, Serif">Accounts
    payable and accrued liabilities</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif">(<ix:nonFraction name="us-gaap:IncreaseDecreaseInAccountsPayableAndAccruedLiabilities" contextRef="From2021-01-01to2021-06-30" format="ixt:numdotdecimal" decimals="0" scale="0" sign="-" unitRef="USD">491,694</ix:nonFraction></span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">)</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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  <tr id="xdx_402_eus-gaap--NetCashProvidedByUsedInOperatingActivities_i01T_pp0p0_mtNCPBUzcRI_maCCERCz0cO_zRo5qC9phYgc" style="vertical-align: bottom; background-color: White">
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cash used in operating activities</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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    <td style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: right"><span style="font-family: Times New Roman, Times, Serif">(<ix:nonFraction name="us-gaap:NetCashProvidedByUsedInOperatingActivities" contextRef="From2020-01-012020-06-30" format="ixt:numdotdecimal" decimals="0" scale="0" sign="-" unitRef="USD">7,923,276</ix:nonFraction></span></td><td style="padding-bottom: 1.5pt; font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">)</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_40E_eus-gaap--NetCashProvidedByUsedInInvestingActivitiesAbstract_iB" style="vertical-align: bottom; background-color: White">
    <td style="font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">Cash flows from investing
    activities:</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_40D_eus-gaap--PaymentsToAcquireAvailableForSaleSecuritiesDebt_i01N_pp0p0_di_msNCPBUz303_zLqcjOYYUS32" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left; padding-left: 10pt"><span style="font-family: Times New Roman, Times, Serif">Purchases of investment
    securities</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">(<ix:nonFraction name="us-gaap:PaymentsToAcquireAvailableForSaleSecuritiesDebt" contextRef="From2021-01-01to2021-06-30" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">40,927,055</ix:nonFraction></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">)</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">(<ix:nonFraction name="us-gaap:PaymentsToAcquireAvailableForSaleSecuritiesDebt" contextRef="From2020-01-012020-06-30" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">9,940,894</ix:nonFraction></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">)</span></td></tr>
  <tr id="xdx_40D_eus-gaap--ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities_i01_pp0p0_maNCPBUz303_zlLEZ0fcNe0d" style="vertical-align: bottom; background-color: White">
    <td style="text-align: left; padding-left: 10pt"><span style="font-family: Times New Roman, Times, Serif">Proceeds from sale and
    maturity of investment securities</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities" contextRef="From2021-01-01to2021-06-30" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">9,000,000</ix:nonFraction></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities" contextRef="From2020-01-012020-06-30" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">15,100,000</ix:nonFraction></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_409_eus-gaap--PaymentsToAcquirePropertyPlantAndEquipment_i01N_di_msNCPBUz303_zmEQaLAkj5me" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left; padding-bottom: 1.5pt; padding-left: 10pt"><span style="font-family: Times New Roman, Times, Serif">Purchases
    of property and equipment</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif">(<ix:nonFraction name="us-gaap:PaymentsToAcquirePropertyPlantAndEquipment" contextRef="From2021-01-01to2021-06-30" format="ixt:numdotdecimal" decimals="0" unitRef="USD">227,000</ix:nonFraction></span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">)</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif">(<ix:nonFraction name="us-gaap:PaymentsToAcquirePropertyPlantAndEquipment" contextRef="From2020-01-012020-06-30" format="ixt:numdotdecimal" decimals="0" unitRef="USD">11,837</ix:nonFraction></span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">)</span></td></tr>
  <tr id="xdx_404_eus-gaap--NetCashProvidedByUsedInInvestingActivities_i01T_pp0p0_mtNCPBUz303_maCCERCz0cO_zydPl3UI9Wwg" style="vertical-align: bottom; background-color: White">
    <td style="font-weight: bold; text-align: left; padding-bottom: 1.5pt; padding-left: 30pt"><span style="font-family: Times New Roman, Times, Serif">Net
    cash (used in) provided by investing activities</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: right"><span style="font-family: Times New Roman, Times, Serif">(<ix:nonFraction name="us-gaap:NetCashProvidedByUsedInInvestingActivities" contextRef="From2021-01-01to2021-06-30" format="ixt:numdotdecimal" decimals="0" scale="0" sign="-" unitRef="USD">32,154,055</ix:nonFraction></span></td><td style="padding-bottom: 1.5pt; font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">)</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:NetCashProvidedByUsedInInvestingActivities" contextRef="From2020-01-012020-06-30" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">5,147,269</ix:nonFraction></span></td><td style="padding-bottom: 1.5pt; font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_40F_eus-gaap--NetCashProvidedByUsedInFinancingActivitiesAbstract_iB" style="vertical-align: bottom; background-color: White">
    <td style="font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">Cash flows from financing
    activities:</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_405_eus-gaap--ProceedsFromIssuanceOfCommonStock_i01_pp0p0_maNCPBUzqQX_zAALIuc61hYg" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left; padding-left: 10pt"><span style="font-family: Times New Roman, Times, Serif">Proceeds from sale of common
    stock equity, net of issuance costs</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:ProceedsFromIssuanceOfCommonStock" contextRef="From2021-01-01to2021-06-30" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">52,697,265</ix:nonFraction></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:ProceedsFromIssuanceOfCommonStock" contextRef="From2020-01-012020-06-30" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">18,182,599</ix:nonFraction></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_40A_ecustom--ProceedsFromIssuanceOfCommonStockUponConversionOfStockWarrants_i01_pp0p0_maNCPBUzqQX_zrIYZPyp6rb2" style="vertical-align: bottom; background-color: White">
    <td style="text-align: left; padding-left: 10pt"><span style="font-family: Times New Roman, Times, Serif">Proceeds from issuance
    of common stock upon conversion of stock warrants</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="CLSN:ProceedsFromIssuanceOfCommonStockUponConversionOfStockWarrants" contextRef="From2021-01-01to2021-06-30" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">1,508,666</ix:nonFraction></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0381">&#8211;</span></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_404_ecustom--ProceedsFromIssuanceOfCommonStockUponConversionOfStockOptions_i01_pp0p0_maNCPBUzqQX_zAP2qTwDHyj8" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left; padding-left: 10pt"><span style="font-family: Times New Roman, Times, Serif">Proceeds from issuance
    of common stock upon conversion of stock options</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="CLSN:ProceedsFromIssuanceOfCommonStockUponConversionOfStockOptions" contextRef="From2021-01-01to2021-06-30" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">4,725</ix:nonFraction></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="CLSN:ProceedsFromIssuanceOfCommonStockUponConversionOfStockOptions" contextRef="From2020-01-012020-06-30" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">371,895</ix:nonFraction></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_409_eus-gaap--ProceedsFromIssuanceOfLongTermDebt_i01_pp0p0_maNCPBUzqQX_zqHGDMPZS7i7" style="vertical-align: bottom; background-color: White">
    <td style="text-align: left; padding-left: 10pt"><span style="font-family: Times New Roman, Times, Serif">Proceeds from the SVB
    Loan Facility, net of issuance costs</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:ProceedsFromIssuanceOfLongTermDebt" contextRef="From2021-01-01to2021-06-30" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">5,756,630</ix:nonFraction></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0387">&#8211;</span></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_40F_eus-gaap--RepaymentsOfLongTermDebt_i01N_pp0p0_di_msNCPBUzqQX_zpOeOtMzG4q6" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left; padding-left: 10pt"><span style="font-family: Times New Roman, Times, Serif">Payoff of the Horizon
    Credit Agreement and accrued end of term fees</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">(<ix:nonFraction name="us-gaap:RepaymentsOfLongTermDebt" contextRef="From2021-01-01to2021-06-30" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">5,190,587</ix:nonFraction></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">)</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0390">&#8211;</span></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_406_eus-gaap--ProceedsFromIssuanceOfDebt_i01_pp0p0_maNCPBUzqQX_zHRm6qY1nCa1" style="vertical-align: bottom; background-color: White">
    <td style="text-align: left; padding-left: 10pt"><span style="font-family: Times New Roman, Times, Serif">Proceeds from Payroll Protection
    Program (PPP) loans</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0392">&#8211;</span></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:ProceedsFromIssuanceOfDebt" contextRef="From2020-01-012020-06-30" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">1,324,750</ix:nonFraction></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_400_eus-gaap--RepaymentsOfDebt_i01N_pp0p0_di_msNCPBUzqQX_z44V9wtvvAya" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left; padding-bottom: 1.5pt; padding-left: 10pt"><span style="font-family: Times New Roman, Times, Serif">Repayments
    on Payroll Protection Program (PPP) loans</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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  <tr id="xdx_400_eus-gaap--CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_iT_pp0p0_mtCCERCz0cO_zIMbfJ5S4mcj" style="vertical-align: bottom; background-color: White">
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  </table>


<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>See
accompanying notes to the condensed consolidated financial statements</b>.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>


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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>CELSION
CORPORATION</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>CONDENSED
CONSOLIDATED</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>STATEMENTS
OF CASH FLOWS (continued)</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>(Unaudited)</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="vertical-align: bottom">
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  <tr style="vertical-align: bottom">
    <td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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  <tr style="vertical-align: bottom">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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  <tr id="xdx_403_eus-gaap--SupplementalCashFlowInformationAbstract_iB" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">Supplemental disclosures of cash flow information:</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
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    <td style="padding-left: 10pt; padding-bottom: 2.5pt; width: 60%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">Interest
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    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_40A_eus-gaap--CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_iB" style="vertical-align: bottom; background-color: White">
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    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
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    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td style="border-bottom: Black 2.5pt double; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:OperatingLeasePayments" contextRef="From2020-01-012020-06-30" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">262,084</ix:nonFraction></span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
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    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td style="border-bottom: Black 2.5pt double; text-align: right"><span style="font: 10pt Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0422">&#8211;</span></span><span style="font: 10pt Times New Roman, Times, Serif"></span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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  <tr style="vertical-align: bottom; background-color: White">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_40C_ecustom--RealizedAndUnrealizedGainsAndLossesNetOnInvestmentInDebtSecurities_i01_pp0p0" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">Realized and unrealized
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  </table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>See
accompanying notes to the condensed consolidated financial statements</b>.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>


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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>CELSION
CORPORATION</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b><span id="cr_007"></span>CONDENSED
CONSOLIDATED</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>STATEMENTS
OF CHANGES IN STOCKHOLDERS&#8217; EQUITY </b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>(Unaudited)</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>THREE
MONTHS ENDED JUNE 30, 2021 AND 2020</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<table cellpadding="0" cellspacing="0" id="xdx_30F_114_zdwoyBxxXG3f" summary="xdx: Statement - Condensed Consolidated Statements of Changes in Stockholders&apos; Equity (Unaudited)" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="display: none; vertical-align: bottom">
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<tr style="vertical-align: bottom">
    <td style="padding-bottom: 1.5pt; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">Three
    Months Ended</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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    <td colspan="2" style="padding-bottom: 1.5pt; text-align: center"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>Additional</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>Paid
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    <td colspan="6" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">Treasury
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    <td colspan="2" style="text-align: center"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom">
    <td style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">June
    30, 2021</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">Shares</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">Amount</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">Capital</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">Income</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">Total</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_43C_c20210401__20210630_eus-gaap--StockholdersEquity_iS_z8qt1t9MfLq4" style="vertical-align: bottom; background-color: rgb(204,238,255)">
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    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td style="width: 5%; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:StockholdersEquity" contextRef="AsOf2021-03-31_us-gaap_AdditionalPaidInCapitalMember" format="ixt:numdotdecimal" decimals="0" unitRef="USD">371,982,609</ix:nonFraction></span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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  <tr id="xdx_400_eus-gaap--NetIncomeLoss_i_pp0p0" style="vertical-align: bottom; background-color: White">
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  <tr id="xdx_400_eus-gaap--StockIssuedDuringPeriodValueNewIssues_i_pp0p0" style="vertical-align: bottom; background-color: rgb(204,238,255)">
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  <tr id="xdx_408_ecustom--StockIssuedUponExerciseOfCommonStockWarrants_zbqeYt3qf986" style="display: none; vertical-align: bottom; background-color: White">
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    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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  <tr id="xdx_402_ecustom--StockIssuedUponExerciseOfCommonStockWarrantsShares_i_pdd" style="display: none; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">Shares issued upon exercise of common stock
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    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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  <tr id="xdx_408_eus-gaap--StockIssuedDuringPeriodValueStockOptionsExercised_zASJs1oo322j" style="display: none; vertical-align: bottom; background-color: White">
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">Shares issued upon exercise of options to purchase
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    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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<tr id="xdx_40C_eus-gaap--StockIssuedDuringPeriodSharesStockOptionsExercised_pid_z4WbS7nKHOqg" style="display: none; vertical-align: bottom; background-color: rgb(204,238,255)">
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    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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<tr id="xdx_40B_eus-gaap--OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_i_pp0p0" style="vertical-align: bottom; background-color: White">
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  <tr id="xdx_409_ecustom--IssuanceOfCommonStockUponExerciseOfOptions_zQtBmXsSzpV3" style="display: none; vertical-align: bottom; background-color: rgb(204,238,255)">
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<tr id="xdx_405_ecustom--IssuanceOfCommonStockUponExerciseOfOptionsShares_pid_zs0iAIxGogh3" style="display: none; vertical-align: bottom; background-color: White">
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">Issuance of common stock upon exercise of options,
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<tr id="xdx_40D_eus-gaap--StockIssuedDuringPeriodValueOther_pid_z1LAdJqJZaBf" style="display: none; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">Common</span><span style="font-family: Times New Roman, Times, Serif">
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<tr id="xdx_40D_eus-gaap--StockIssuedDuringPeriodSharesOther_pid_zE6pAbmX7yE7" style="display: none; vertical-align: bottom; background-color: White">
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">Common</span><span style="font-family: Times New Roman, Times, Serif">
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<tr id="xdx_409_eus-gaap--AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_i_pp0p0" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">Stock-based compensation
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<tr id="xdx_434_c20210401__20210630_eus-gaap--StockholdersEquity_iE_z7CYqSEzYGw8" style="vertical-align: bottom; background-color: White">
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  </table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="vertical-align: bottom">
    <td style="padding-bottom: 1.5pt; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">Three
    Months Ended</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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    <td colspan="2" style="text-align: center"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom">
    <td style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">June
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    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">Amount</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">Capital</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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  <tr style="vertical-align: bottom">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_431_c20200401__20200630_eus-gaap--StockholdersEquity_iS_zcyxJK6LYoI9" style="vertical-align: bottom; background-color: rgb(204,238,255)">
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    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td style="width: 5%; text-align: right"><span style="font-family: Times New Roman, Times, Serif">(<ix:nonFraction name="us-gaap:StockholdersEquity" contextRef="AsOf2020-03-31_us-gaap_RetainedEarningsMember" format="ixt:numdotdecimal" decimals="0" sign="-" unitRef="USD">295,573,658</ix:nonFraction></span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">)</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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  <tr id="xdx_40F_eus-gaap--NetIncomeLoss_zDbdAoBzOtzi" style="vertical-align: bottom; background-color: White">
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    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">-</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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  </table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; text-align: center; margin-top: 0; margin-bottom: 0"><span style="font: 10pt Times New Roman, Times, Serif"><b>See
accompanying notes to the condensed consolidated financial statements</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>


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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif"><b>&#160;</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>CELSION
CORPORATION</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>CONDENSED
CONSOLIDATED</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>STATEMENTS
OF CHANGES IN STOCKHOLDERS&#8217; EQUITY (continued)</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>(Unaudited)</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>SIX
MONTHS ENDED JUNE 30, 2021 AND 2020</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="vertical-align: bottom">
    <td style="padding-bottom: 1.5pt; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">Six
    Months Ended</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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  <tr style="vertical-align: bottom">
    <td style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">June
    30, 2021</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">Shares</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">Capital</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
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    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td style="width: 5%; text-align: right"><span style="font-family: Times New Roman, Times, Serif">(<ix:nonFraction name="us-gaap:StockholdersEquity" contextRef="AsOf2020-12-31_us-gaap_RetainedEarningsMember" format="ixt:numdotdecimal" decimals="0" sign="-" unitRef="USD">312,000,341</ix:nonFraction></span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">)</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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  <tr id="xdx_40A_eus-gaap--NetIncomeLoss_zrwZreS5E22c" style="vertical-align: bottom; background-color: White">
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">Net loss</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">-</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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  <tr id="xdx_401_ecustom--StockIssuedUponExerciseOfCommonStockWarrants_i_pp0p0" style="vertical-align: bottom; background-color: White">
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  <tr id="xdx_40D_eus-gaap--OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_zY2VB7n360th" style="vertical-align: bottom; background-color: White">
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  </table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="vertical-align: bottom">
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  <tr style="vertical-align: bottom">
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  <tr id="xdx_43B_c20200101__20200630_eus-gaap--StockholdersEquity_iS_zvzldwrUlSjd" style="vertical-align: bottom; background-color: rgb(204,238,255)">
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  <tr id="xdx_400_eus-gaap--NetIncomeLoss_zdLfsGdB4G15" style="vertical-align: bottom; background-color: White">
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">Net loss</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>See
accompanying notes to the condensed consolidated financial statements</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>


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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>CELSION
CORPORATION</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b><span id="cr_008"></span>NOTES
TO THE CONDENSED CONSOLIDATED</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>FINANCIAL
STATEMENTS</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>(UNAUDITED)</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>FOR
THE THREE AND SIX MONTHS ENDED JUNE 2021 AND 2020</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<ix:nonNumeric contextRef="From2021-01-01to2021-06-30" escape="true" name="us-gaap:BusinessDescriptionAndAccountingPoliciesTextBlock"><p id="xdx_809_eus-gaap--BusinessDescriptionAndAccountingPoliciesTextBlock_zd0d78DlCrA4" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><b>Note
1. <span id="xdx_826_z77l7KZWFk3g">Business Description</span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Celsion
Corporation (&#8220;Celsion&#8221; and the &#8220;Company&#8221;) is a fully integrated, clinical stage biotechnology company focused
on advancing a portfolio of innovative treatments including DNA-based immunotherapies, next generation vaccines and directed chemotherapies
through clinical trials and eventual commercialization. The Company&#8217;s product pipeline includes GEN-1, a DNA-based immunotherapy
for the localized treatment of ovarian cancer and ThermoDox<sup>&#174;</sup>, a proprietary heat-activated liposomal encapsulation of
doxorubicin, currently under investigator-sponsored development for several cancer indications. Celsion has two feasibility stage platform
technologies for the development of novel nucleic acid-based immunotherapies and next generation vaccines and other anti-cancer DNA or
RNA therapies. Both are novel synthetic, non-viral vectors with demonstrated capability in nucleic acid cellular transfection.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

</ix:nonNumeric><ix:nonNumeric contextRef="From2021-01-01to2021-06-30" escape="true" name="us-gaap:BasisOfAccounting"><p id="xdx_808_eus-gaap--BasisOfAccounting_zZVqsNibJoJk" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><b>Note
2. <span id="xdx_828_ztNFNuNVrkjl">Basis of Presentation</span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">The
accompanying unaudited condensed consolidated financial statements, which include the accounts of the Company and its wholly owned subsidiaries,
CLSN Laboratories, Inc. and Celsion, GmbH, have been prepared in accordance with generally accepted accounting principles
in the United States (GAAP) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X.
All significant intercompany balances and transactions have been eliminated in consolidation. Certain information and disclosures normally
included in financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">In
the opinion of management, all adjustments, consisting only of normal recurring accruals considered necessary for a fair presentation,
have been included in the accompanying unaudited condensed consolidated financial statements. Operating results for the three and six-month
periods June 30, 2021 and 2020 are not necessarily indicative of the results that may be expected for any other interim period(s)
or for any full year. For further information, refer to the financial statements and notes thereto included in the Company&#8217;s Annual
Report on Form 10-K for the fiscal year ended December 31, 2020 filed with the Securities and Exchange Commission (SEC) on March 19,
2021.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">The
preparation of financial statements in conformity with GAAP requires management to make judgments, estimates, and assumptions that affect
the amount reported in the Company&#8217;s financial statements and accompanying notes. Actual results could differ materially from those
estimates. Events and conditions arising subsequent to the most recent balance sheet date have been evaluated for their possible impact
on the financial statements and accompanying notes. The Company continues to monitor the impact of the COVID-19 pandemic on its financial
condition and results of operations, along with the valuation of its long-term assets, intangible assets, and goodwill. The effect of
this matter could potentially have an impact on the valuation of such assets in the future. The COVID-19 pandemic is discussed in more
detail in Note 3 to the financial statements.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

</ix:nonNumeric><ix:nonNumeric contextRef="From2021-01-01to2021-06-30" escape="true" name="us-gaap:SubstantialDoubtAboutGoingConcernTextBlock"><p id="xdx_807_eus-gaap--SubstantialDoubtAboutGoingConcernTextBlock_zv4RrF6zTDT7" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><b>Note
3. <span id="xdx_821_zcInolR5nAVk">Financial Condition and Business Plan</span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Since
inception, the Company has incurred substantial operating losses, principally from expenses associated with the Company&#8217;s research
and development programs, clinical trials conducted in connection with the Company&#8217;s product candidates, and applications and submissions
to the U.S. Food and Drug Administration. The Company has not generated significant revenue and has incurred significant net losses in
each year since our inception. As of June 30, 2021, the Company has incurred approximately $<span id="xdx_90D_eus-gaap--RetainedEarningsAccumulatedDeficit_iNI_pn6n6_di_c20210630_ztG3Q0nMBMe1"><ix:nonFraction name="us-gaap:RetainedEarningsAccumulatedDeficit" contextRef="AsOf2021-06-30" format="ixt:numdotdecimal" decimals="-6" scale="6" sign="-" unitRef="USD">323</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million of cumulative net losses and had approximately
$<span id="xdx_90D_ecustom--CashAndCashEquivalentsRestrictedCashShorttermInvestmentsAndReceivableOnSaleOfNetOperatingLosses_iI_pn5n6_c20210630_zk4bgIWIquY2"><ix:nonFraction name="CLSN:CashAndCashEquivalentsRestrictedCashShorttermInvestmentsAndReceivableOnSaleOfNetOperatingLosses" contextRef="AsOf2021-06-30" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">64.5</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million in cash and cash equivalents, restricted
cash, short-term investments and interest receivable. We have substantial future capital requirements to continue our research
and development activities and advance our product candidates through various development stages. The Company believes these expenditures
are essential for the commercialization of its technologies.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">The
Company expects its operating losses to continue for the foreseeable future as it continues its product development efforts, and when
it undertakes marketing and sales activities. The Company&#8217;s ability to achieve profitability is dependent upon its ability to obtain
governmental approvals, manufacture, and market and sell its product candidates. There can be no assurance that the Company will be able
to commercialize its technology successfully or that profitability will ever be achieved. The operating results of the Company have fluctuated
significantly in the past.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>


<ix:exclude><!-- Field: Page; Sequence: 12 -->
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    <div style="break-before: page; margin-top: 6pt"><table cellpadding="0" cellspacing="0" style="border-collapse: collapse; width: 100%; font-size: 10pt"><tr style="vertical-align: top; text-align: left"><td style="text-align: center; width: 100%">&#160;</td></tr></table></div>
    <!-- Field: /Page --></ix:exclude>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">In
January 2020, the WHO declared an outbreak of coronavirus, COVID-19, to be a &#8220;Public Health Emergency of International Concern,&#8221;
and the U.S. Department of Health and Human Services declared a public health emergency to aid the U.S. healthcare community in responding
to COVID-19. This virus has spread to over 100 countries, including the U.S. Governments and businesses around the world have taken unprecedented
actions to mitigate the spread of COVID-19, including, but not limited to, shelter-in-place orders, quarantines, significant restrictions
on travel, as well as restrictions that prohibit many employees from going to work. Uncertainty with respect to the economic impacts
of the pandemic has introduced significant volatility in the financial markets. The Company did not observe significant impacts on its
business or results of operations during 2020 and into 2021 due to COVID-19. While the extent to which COVID-19 impacts the Company&#8217;s
future results will depend on future developments, the pandemic and associated economic impacts could result in a material impact to
the Company&#8217;s future financial condition, results of operations and cash flows. The Company&#8217;s ability to raise additional
capital may be adversely impacted by potential worsening global economic conditions and the recent disruptions to, and volatility in,
financial markets in the U.S. and worldwide resulting from the ongoing COVID-19 pandemic. The disruptions caused by COVID-19 may also
disrupt the clinical trials process and enrolment of patients. This may delay commercialization efforts. The Company continues to monitor
its operating activities in light of these events. The specific impact, if any, is not readily determinable as of the date of these financial
statements.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">The
actual amount of funds the Company will need to operate is subject to many factors, some of which are beyond the Company&#8217;s control.
These factors include the following:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<table cellspacing="0" cellpadding="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; width: 0.5in; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#9679;</span></td>
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  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#9679;</span></td>
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  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#9679;</span></td>
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  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#9679;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">the
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  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#9679;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">the
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  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#9679;</span></td>
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  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#9679;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">the
    ability to achieve milestones under licensing arrangements;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#9679;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">the
    costs involved in prosecuting and enforcing patent claims and other intellectual property rights; and</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#9679;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">the
    costs and timing of regulatory approvals.</span></td></tr>
  </table>
<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">On
July 13, 2020, the Company announced that it has received a recommendation from the independent DMC to consider stopping the global Phase
III OPTIMA Study of ThermoDox<sup>&#174; </sup>in combination with RFA for the treatment of HCC, or primary liver cancer. The recommendation
was made following the second pre-planned interim safety and efficacy analysis by the DMC on July 9, 2020. The DMC&#8217;s analysis found
that the pre-specified boundary for stopping the trial for futility of 0.900 was crossed with an actual value of 0.903. The Company followed
the advice of the DMC and considered its options to either stop the study or continue to follow patients after a thorough review of the
data, and an evaluation of the probability of success. On February 11, 2021, the Company issued a letter to shareholders stating that
the Company was notifying all clinical sites to discontinue following patients in the OPTIMA Study.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">During
2020, 2019 and 2018, the Company submitted applications to sell a portion of the Company&#8217;s State of New Jersey net operating losses
as part of the Technology Business Tax Certificate Program sponsored by The New Jersey Economic Development Authority. Under the program,
emerging biotechnology companies with unused NOLs and unused research and development credits are allowed to sell these benefits to other
New Jersey-based companies. In 2018 and 2019, the Company sold NOLs totaling $<span id="xdx_904_ecustom--NetProceedsFromSaleOfNetOperatingLosses_pn6n6_c20180101__20181231__srt--StatementGeographicalAxis__custom--NJMember_zHT2zFu4X2nj"><ix:nonFraction name="CLSN:NetProceedsFromSaleOfNetOperatingLosses" contextRef="From2018-01-012018-12-31_custom_NJMember" format="ixt:numdotdecimal" decimals="-6" scale="6" unitRef="USD">13</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million receiving net proceeds of $<span id="xdx_90B_ecustom--NetProceedsFromSaleOfNetOperatingLosses_pn5n6_c20190101__20191231__srt--StatementGeographicalAxis__custom--NJMember_z5oV6bjqj5ne"><ix:nonFraction name="CLSN:NetProceedsFromSaleOfNetOperatingLosses" contextRef="From2019-01-012019-12-31_custom_NJMember" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">12.2</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million. In June 2020 and as updated in September
2020, the Company filed an application with the New Jersey Economic Development Authority to sell substantially all of its remaining
State of New Jersey net operating losses totaling $<span id="xdx_90C_ecustom--NetProceedsFromSaleOfNetOperatingLosses_pn5n6_c20200901__20200930__srt--StatementGeographicalAxis__custom--NJMember_zpaYoC4lW2z3"><ix:nonFraction name="CLSN:NetProceedsFromSaleOfNetOperatingLosses" contextRef="From2020-09-012020-09-30_custom_NJMember" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">2.0</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million available under the program. On February
12, 2021, the New Jersey Economic Development Authority approved the full amount of the Company&#8217;s application. In February of 2021,
the Company entered into an agreement to sell the net operating losses from the 2020 application and the Company received net proceeds
of approximately $<span id="xdx_90E_ecustom--ReceivableOnSaleOfNetOperatingLosses_iI_pn4n6_c20210630_zGqiWGHT1ncg"><ix:nonFraction name="CLSN:ReceivableOnSaleOfNetOperatingLosses" contextRef="AsOf2021-06-30" format="ixt:numdotdecimal" decimals="-4" scale="6" unitRef="USD">1.85</ix:nonFraction></span></span>
<span style="font: 10pt Times New Roman, Times, Serif">million on May 10, 2021. During 2021, the New Jersey State
Legislature increased the maximum lifetime benefit per company from $<span id="xdx_90C_ecustom--NetProceedsFromSaleOfNetOperatingLosses_pn6n6_c20210509__20210510__srt--StatementGeographicalAxis__custom--NJMember__srt--RangeAxis__srt--MinimumMember_zyDmUzUgjYo1"><ix:nonFraction name="CLSN:NetProceedsFromSaleOfNetOperatingLosses" contextRef="From2021-05-092021-05-10_custom_NJMember_srt_MinimumMember" format="ixt:numdotdecimal" decimals="-6" scale="6" unitRef="USD">15</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million to $<span id="xdx_90E_ecustom--NetProceedsFromSaleOfNetOperatingLosses_pn6n6_c20210509__20210510__srt--StatementGeographicalAxis__custom--NJMember__srt--RangeAxis__srt--MaximumMember_zTnGwnQ5wTN7"><ix:nonFraction name="CLSN:NetProceedsFromSaleOfNetOperatingLosses" contextRef="From2021-05-092021-05-10_custom_NJMember_srt_MaximumMember" format="ixt:numdotdecimal" decimals="-6" scale="6" unitRef="USD">20</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million, which will allow the Company to participate
in this innovative funding program in future years. On June 16, 2021, the Company filed another application to sell approximately $<span id="xdx_903_ecustom--NetProceedsFromSaleOfNetOperatingLosses_pn5n6_c20210615__20210616__srt--StatementGeographicalAxis__custom--NJMember_zOrlede95sDf"><ix:nonFraction name="CLSN:NetProceedsFromSaleOfNetOperatingLosses" contextRef="From2021-06-152021-06-16_custom_NJMember" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">1.6</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million of net operating losses during 2021
and expects to receive up to approximately $<span id="xdx_908_ecustom--NetProceedsFromSaleOfNetOperatingLosses_pn5n6_c20210615__20210616__srt--StatementGeographicalAxis__custom--NJMember__srt--RangeAxis__srt--MaximumMember_zM14sOMsind"><ix:nonFraction name="CLSN:NetProceedsFromSaleOfNetOperatingLosses" contextRef="From2021-06-152021-06-16_custom_NJMember_srt_MaximumMember" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">1.4</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million under the current year program.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>


<ix:exclude><!-- Field: Page; Sequence: 13 -->
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    <div style="break-before: page; margin-top: 6pt"><table cellpadding="0" cellspacing="0" style="border-collapse: collapse; width: 100%; font-size: 10pt"><tr style="vertical-align: top; text-align: left"><td style="text-align: center; width: 100%">&#160;</td></tr></table></div>
    <!-- Field: /Page --></ix:exclude>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">In
June 2018, the Company entered into a Credit Agreement with Horizon Technology Finance Corporation (&#8220;Horizon&#8221;) that provided
$<span id="xdx_902_eus-gaap--ProceedsFromContributedCapital_pn6n6_c20180601__20180630__us-gaap--TypeOfArrangementAxis__custom--HorizonCreditAgreementMember__dei--LegalEntityAxis__custom--HorizonTechnologyFinanceCorporationMember_zdLw2GbVEqGg"><ix:nonFraction name="us-gaap:ProceedsFromContributedCapital" contextRef="From2018-06-012018-06-30_custom_HorizonCreditAgreementMember_custom_HorizonTechnologyFinanceCorporationMember" format="ixt:numdotdecimal" decimals="-6" scale="6" unitRef="USD">10</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million in capital (the &#8220;Horizon Credit
Agreement&#8221;). The obligations under the Horizon Credit Agreement are secured by a first-priority security interest in substantially
all assets of Celsion other than intellectual property assets. Payments under the loan agreement are interest only (calculated based
on one-month LIBOR plus <span id="xdx_90D_eus-gaap--DebtInstrumentInterestRateStatedPercentage_iI_pid_dp_uPercentage_c20180630__us-gaap--TypeOfArrangementAxis__custom--HorizonCreditAgreementMember__dei--LegalEntityAxis__custom--HorizonTechnologyFinanceCorporationMember__us-gaap--VariableRateAxis__us-gaap--LondonInterbankOfferedRateLIBORMember_zVwTUEla0Zqh"><ix:nonFraction name="us-gaap:DebtInstrumentInterestRateStatedPercentage" contextRef="AsOf2018-06-30_custom_HorizonCreditAgreementMember_custom_HorizonTechnologyFinanceCorporationMember_us-gaap_LondonInterbankOfferedRateLIBORMember" format="ixt:numdotdecimal" decimals="INF" scale="-2" unitRef="Percentage">7.625</ix:nonFraction></span></span><span style="font: 10pt Times New Roman, Times, Serif">%)
for the first 24 months through July 2020, followed by a 21-month amortization period of principal and interest starting on August 1,
2020 and ending through the scheduled maturity date on April 1, 2023. On August 28, 2020, in connection with an Amendment to the Horizon
Credit Agreement, Celsion repaid $<span id="xdx_90E_eus-gaap--RepaymentsOfNotesPayable_pn6n6_c20200827__20200828__us-gaap--TypeOfArrangementAxis__custom--AmendmentToHorizonCreditAgreementMember__dei--LegalEntityAxis__custom--HorizonTechnologyFinanceCorporationMember_zQaoltFZ080c"><ix:nonFraction name="us-gaap:RepaymentsOfNotesPayable" contextRef="From2020-08-272020-08-28_custom_AmendmentToHorizonCreditAgreementMember_custom_HorizonTechnologyFinanceCorporationMember" format="ixt:numdotdecimal" decimals="-6" scale="6" unitRef="USD">5</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million of the $<span id="xdx_907_eus-gaap--DebtInstrumentFaceAmount_iI_pn6n6_c20200828__us-gaap--TypeOfArrangementAxis__custom--HorizonCreditAgreementMember__dei--LegalEntityAxis__custom--HorizonTechnologyFinanceCorporationMember_zJqDwhPMg24e"><ix:nonFraction name="us-gaap:DebtInstrumentFaceAmount" contextRef="AsOf2020-08-28_custom_HorizonCreditAgreementMember_custom_HorizonTechnologyFinanceCorporationMember" format="ixt:numdotdecimal" decimals="-6" scale="6" unitRef="USD">10</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million loan and $<span id="xdx_902_ecustom--PaymentOfDebtEndTermCharges_pn5n6_c20200827__20200828__us-gaap--TypeOfArrangementAxis__custom--AmendmentToHorizonCreditAgreementMember__dei--LegalEntityAxis__custom--HorizonTechnologyFinanceCorporationMember_z5f0yRKT1L5k"><ix:nonFraction name="CLSN:PaymentOfDebtEndTermCharges" contextRef="From2020-08-272020-08-28_custom_AmendmentToHorizonCreditAgreementMember_custom_HorizonTechnologyFinanceCorporationMember" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">0.2</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million in related end of term charges, and the
remaining $<span id="xdx_90E_eus-gaap--DebtInstrumentFaceAmount_iI_pn6n6_c20200828__us-gaap--TypeOfArrangementAxis__custom--AmendmentToHorizonCreditAgreementMember__dei--LegalEntityAxis__custom--HorizonTechnologyFinanceCorporationMember_z0bp8AxcWkHd"><ix:nonFraction name="us-gaap:DebtInstrumentFaceAmount" contextRef="AsOf2020-08-28_custom_AmendmentToHorizonCreditAgreementMember_custom_HorizonTechnologyFinanceCorporationMember" format="ixt:numdotdecimal" decimals="-6" scale="6" unitRef="USD">5</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million in obligations were restructured. As
more fully discussed in Note 11 to these financial statements, in June 2021, the Company entered into a $<span id="xdx_907_eus-gaap--LineOfCreditFacilityMaximumBorrowingCapacity_iI_pn6n6_c20210630__us-gaap--RelatedPartyTransactionsByRelatedPartyAxis__custom--SiliconValleyBankMember__us-gaap--TypeOfArrangementAxis__custom--SVBLoanFacilityMember_zV2Rv9i8JACe"><ix:nonFraction name="us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity" contextRef="AsOf2021-06-30_custom_SiliconValleyBankMember_custom_SVBLoanFacilityMember" format="ixt:numdotdecimal" decimals="-6" scale="6" unitRef="USD">10</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million loan facility with Silicon Valley Bank.
The Company immediately used $<span id="xdx_90D_ecustom--RepaymentOfOutstandingIndebtednessAmount_iI_pn6n6_c20210630__dei--LegalEntityAxis__custom--HorizonTechnologyFinanceCorporationMember__us-gaap--TypeOfArrangementAxis__custom--SVBLoanFacilityMember_zNLFG1E2xTB3"><ix:nonFraction name="CLSN:RepaymentOfOutstandingIndebtednessAmount" contextRef="AsOf2021-06-30_custom_HorizonTechnologyFinanceCorporationMember_custom_SVBLoanFacilityMember" format="ixt:numdotdecimal" decimals="-6" scale="6" unitRef="USD">6</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million from this facility to retire all outstanding
indebtedness with Horizon Technology Finance Corporation. The remaining $<span id="xdx_90B_eus-gaap--LineOfCreditFacilityRemainingBorrowingCapacity_iI_pn6n6_c20210630__us-gaap--RelatedPartyTransactionsByRelatedPartyAxis__custom--SiliconValleyBankMember__us-gaap--TypeOfArrangementAxis__custom--SVBLoanFacilityMember_zxSF6sRCR6Dg"><ix:nonFraction name="us-gaap:LineOfCreditFacilityRemainingBorrowingCapacity" contextRef="AsOf2021-06-30_custom_SiliconValleyBankMember_custom_SVBLoanFacilityMember" format="ixt:numdotdecimal" decimals="-6" scale="6" unitRef="USD">4</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million will be available to be drawn down up
to 12 months after closing and will be used for working capital and to fund the advancement of the Company&#8217;s product pipelines.
The funding is in the form of money market secured indebtedness bearing interest at a calculated WSJ Prime-based variable rate (currently
<span id="xdx_907_eus-gaap--DebtInstrumentInterestRateStatedPercentage_iI_pid_dp_uPercentage_c20210630__us-gaap--RelatedPartyTransactionsByRelatedPartyAxis__custom--SiliconValleyBankMember__us-gaap--VariableRateAxis__us-gaap--PrimeRateMember__us-gaap--TypeOfArrangementAxis__custom--SVBLoanFacilityMember_zwZJPMZvFLd4"><ix:nonFraction name="us-gaap:DebtInstrumentInterestRateStatedPercentage" contextRef="AsOf2021-06-30_custom_SiliconValleyBankMember_us-gaap_PrimeRateMember_custom_SVBLoanFacilityMember" format="ixt:numdotdecimal" decimals="INF" scale="-2" unitRef="Percentage">3.25</ix:nonFraction></span></span><span style="font: 10pt Times New Roman, Times, Serif">%).
<span id="xdx_90C_eus-gaap--DebtInstrumentDescription_c20210101__20210630__us-gaap--TypeOfArrangementAxis__custom--SVBLoanFacilityMember_zf4PMOmqOnt5"><ix:nonNumeric contextRef="From2021-01-012021-06-30_custom_SVBLoanFacilityMember" name="us-gaap:DebtInstrumentDescription">Payments
under the loan agreement are interest only for the first 24 months after loan closing, followed by a 24-month amortization period of
principal and interest through the scheduled maturity date.</ix:nonNumeric></span></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">As
more fully discussed in Note 12, during 2021 through the date of the filing of this Quarterly Report on Form 10-Q, the Company has raised
approximately $<span id="xdx_901_eus-gaap--ProceedsFromContributedCapital_pn5n6_c20210317__20210319__us-gaap--TypeOfArrangementAxis__custom--CapitalOnDemandTMSalesAgreementMember__dei--LegalEntityAxis__custom--JonesTradingInstitutionalServicesLLCMember_za4ISqmWMfL4"><ix:nonFraction name="us-gaap:ProceedsFromContributedCapital" contextRef="From2021-03-172021-03-19_custom_CapitalOnDemandTMSalesAgreementMember_custom_JonesTradingInstitutionalServicesLLCMember" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">6.9</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million in gross proceeds from the use of its
JonesTrading Capital on Demand<sup>TM</sup> financing facility, $<span id="xdx_903_eus-gaap--DebtInstrumentFaceAmount_iI_pn6n6_c20210131__us-gaap--TypeOfArrangementAxis__custom--CapitalOnDemandTMSalesAgreementMember__dei--LegalEntityAxis__custom--JonesTradingInstitutionalServicesLLCMember_zqPg8iwXU2p2"><ix:nonFraction name="us-gaap:DebtInstrumentFaceAmount" contextRef="AsOf2021-01-31_custom_CapitalOnDemandTMSalesAgreementMember_custom_JonesTradingInstitutionalServicesLLCMember" format="ixt:numdotdecimal" decimals="-6" scale="6" unitRef="USD">35</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million from a registered direct financing completed
in January 2021, $<span id="xdx_909_eus-gaap--DebtInstrumentFaceAmount_iI_pn6n6_c20210405__us-gaap--TypeOfArrangementAxis__custom--CapitalOnDemandTMSalesAgreementMember__dei--LegalEntityAxis__custom--JonesTradingInstitutionalServicesLLCMember_zQjCKudCqbe8"><ix:nonFraction name="us-gaap:DebtInstrumentFaceAmount" contextRef="AsOf2021-04-05_custom_CapitalOnDemandTMSalesAgreementMember_custom_JonesTradingInstitutionalServicesLLCMember" format="ixt:numdotdecimal" decimals="-6" scale="6" unitRef="USD">15</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million from a registered direct financing completed
on April 5, 2021, and $<span id="xdx_907_eus-gaap--ProceedsFromWarrantExercises_pn5n6_c20210101__20210131__us-gaap--TypeOfArrangementAxis__custom--CapitalOnDemandTMSalesAgreementMember__dei--LegalEntityAxis__custom--JonesTradingInstitutionalServicesLLCMember_zK45SMEHZAQk"><ix:nonFraction name="us-gaap:ProceedsFromWarrantExercises" contextRef="From2021-01-012021-01-31_custom_CapitalOnDemandTMSalesAgreementMember_custom_JonesTradingInstitutionalServicesLLCMember" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">1.5</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million from warrant exercises. With $<span id="xdx_906_ecustom--CashAndCashEquivalentsRestrictedCashShorttermInvestmentsAndReceivableOnSaleOfNetOperatingLosses_iI_pn5n6_c20210630__dei--LegalEntityAxis__custom--JonesTradingInstitutionalServicesLLCMember__us-gaap--TypeOfArrangementAxis__custom--CapitalOnDemandTMSalesAgreementMember_zAvkbZ7Ym9Yl"><ix:nonFraction name="CLSN:CashAndCashEquivalentsRestrictedCashShorttermInvestmentsAndReceivableOnSaleOfNetOperatingLosses" contextRef="AsOf2021-06-30_custom_JonesTradingInstitutionalServicesLLCMember_custom_CapitalOnDemandTMSalesAgreementMember" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">64.5</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million in cash and cash equivalents, restricted
cash, short-term investments and interest receivable, the Company believes it has sufficient capital resources to fund
its operations through the end of 2024.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">The
Company has based its estimates on assumptions that may prove to be wrong. The Company may need to obtain additional funds sooner or
in greater amounts than it currently anticipates. Potential sources of financing include strategic relationships, public or private sales
of the Company&#8217;s shares or debt, the sale of the Company&#8217;s State of New Jersey net operating losses and other sources. If
the Company raises funds by selling additional shares of common stock or other securities convertible into common stock, the ownership
interest of existing stockholders may be diluted.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

</ix:nonNumeric><ix:nonNumeric contextRef="From2021-01-01to2021-06-30" escape="true" name="us-gaap:NewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock"><p id="xdx_801_eus-gaap--NewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock_z9QsB29XOOTj" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><b>Note
4. <span id="xdx_82F_z5vVHZtyOqXc">New Accounting Pronouncements</span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">From
time to time, new accounting pronouncements are issued by the Financial Accounting Standards Board (FASB) and are adopted by us as of
the specified effective date. Unless otherwise discussed, we believe that the impact of recently issued accounting pronouncements will
not have a material impact on the Company&#8217;s condensed consolidated financial position, results of operations, and cash flows, or
do not apply to our operations.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">In
June 2016, the FASB issued ASU No. 2016-13, &#8220;Financial Instruments &#8211; Credit Losses (Topic 326): Measurement of Credit Losses
on Financial Instruments&#8221;, which modifies the measurement of expected credit losses on certain financial instruments. The Company
adopted ASU 2016-13 in the first quarter of 2021 utilizing the modified retrospective transition method. Based on the composition of
the Company&#8217;s investment portfolio and current market conditions, the adoption of ASU 2016-13 did not have a material impact on
its consolidated financial statements.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">In
December 2019, the FASB issued ASU No. 2019-12, Income Taxes (Topic 740). The standard simplifies the accounting for incomes taxes by
removing certain exceptions to the general principles in Topic 740 related to the approach for intra-period tax allocation and the recognition
of deferred tax liabilities for outside basis differences. The standard also clarifies the accounting for transactions that result in
a step-up in the tax basis of goodwill. The standard also improves consistent application of and simplifies GAAP for other areas of Topic
740 by clarifying and amending existing guidance. The amendment is effective for fiscal years, and interim periods within those fiscal
years, beginning after December 15, 2020. The Company adopted this standard during the first quarter of 2021. The adoption of ASU 2019-12
did not have a material impact on its consolidated financial statements.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">In
connection with the upcoming elimination of the London Inter-bank Offered Rate, (&#8220;LIBOR&#8221;) and other reference interest rates,
the FASB issued ASU 2020-04, Reference Rate Reform (Topic 848) Facilitation of the Effects of Reference Reform on Financial Reporting.
ASU 2020-04, which is available for contract modifications and hedging relationship modifications entered into or evaluated before December
31, 2022, provides certain practical expedients related to simplifying the accounting for contract modifications resulting from the change
in terms from LIBOR to a new required interest rate benchmark. The Company is currently evaluating the effects of adopting this accounting
standards update.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

</ix:nonNumeric><ix:nonNumeric contextRef="From2021-01-01to2021-06-30" escape="true" name="us-gaap:RestrictedAssetsDisclosureTextBlock"><p id="xdx_80F_eus-gaap--RestrictedAssetsDisclosureTextBlock_zSgNtnKozLjb" style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif"><b>Note
5. <span id="xdx_82D_z5d9qsvgwDE2">Restricted Cash</span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif"><b>&#160;</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">As
a condition of the $<span id="xdx_901_eus-gaap--LineOfCreditFacilityMaximumBorrowingCapacity_iI_pn6n6_c20210618__us-gaap--RelatedPartyTransactionsByRelatedPartyAxis__custom--SiliconValleyBankMember__us-gaap--TypeOfArrangementAxis__custom--SVBLoanFacilityMember_zI0eQmDX1ONi"><ix:nonFraction name="us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity" contextRef="AsOf2021-06-18_custom_SiliconValleyBankMember_custom_SVBLoanFacilityMember" format="ixt:numdotdecimal" decimals="-6" scale="6" unitRef="USD">10</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million loan facility with Silicon Valley Bank
(&#8220;SVB&#8221;) entered into on June 18, 2021 as further discussed in Note 11, <span id="xdx_900_eus-gaap--LineOfCreditFacilityDescription_c20210601__20210618__us-gaap--TypeOfArrangementAxis__custom--SVBLoanFacilityMember_zVcmOyGoWY94"><ix:nonNumeric contextRef="From2021-06-012021-06-18_custom_SVBLoanFacilityMember" name="us-gaap:LineOfCreditFacilityDescription">the
Company is required at all times to maintain on deposit with SVB as cash collateral in a segregated money market bank account
in the name of the Company, unrestricted and unencumbered cash in an amount of at least 100% of the aggregate outstanding amount of the
SVB loan facility. SVB may restrict withdrawals or transfers by or on behalf of the Company that would violate this requirement.</ix:nonNumeric>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">The required reserve totaled $<span id="xdx_90A_eus-gaap--RestrictedInvestments_iI_pn5n6_c20210630__us-gaap--RelatedPartyTransactionsByRelatedPartyAxis__custom--SiliconValleyBankMember__us-gaap--TypeOfArrangementAxis__custom--SVBLoanFacilityMember_ziQKADbcEov2"><ix:nonFraction name="us-gaap:RestrictedInvestments" contextRef="AsOf2021-06-30_custom_SiliconValleyBankMember_custom_SVBLoanFacilityMember" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">6.0</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million as of June 30, 2021. This amount is presented
in part as restricted cash in other non-current assets on the accompanying condensed consolidated balance sheets.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>


<ix:exclude><!-- Field: Page; Sequence: 14 -->
    <div style="border-bottom: Black 1.5pt solid; margin-bottom: 6pt"><table cellpadding="0" cellspacing="0" style="border-collapse: collapse; width: 100%; font-size: 10pt"><tr style="vertical-align: top; text-align: left"><td style="text-align: center; width: 100%"><!-- Field: Sequence; Type: Arabic; Name: PageNo -->11<!-- Field: /Sequence --></td></tr></table></div>
    <div style="break-before: page; margin-top: 6pt"><table cellpadding="0" cellspacing="0" style="border-collapse: collapse; width: 100%; font-size: 10pt"><tr style="vertical-align: top; text-align: left"><td style="text-align: center; width: 100%">&#160;</td></tr></table></div>
    <!-- Field: /Page --></ix:exclude>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<ix:nonNumeric contextRef="From2021-01-01to2021-06-30" escape="true" name="us-gaap:ScheduleOfRestrictedCashAndCashEquivalentsTextBlock"><p id="xdx_898_eus-gaap--ScheduleOfRestrictedCashAndCashEquivalentsTextBlock_z8WfHHRzm9Ci" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">The
following table reconciles cash and cash equivalents and restricted cash per the balance sheet to the condensed statement of cash flows:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; display: none; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;<span id="xdx_8B9_zu6BBBVVxRYh">Schedule
of Cash and Cash Equivalents and Restricted Cash</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="vertical-align: bottom">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" id="xdx_499_20210630_zGNQaOpaYT13" style="font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">June
    30,</span></td><td style="font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" id="xdx_493_20200630_zxHHC3hlb117" style="font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">June
    30,</span></td><td style="font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">2021</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">2020</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_405_eus-gaap--CashAndCashEquivalentsAtCarryingValue_iI_pp0p0_maCCERCz29N_ztdehdP1Lfm9" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="width: 60%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">Cash and cash equivalents</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td style="width: 16%; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:CashAndCashEquivalentsAtCarryingValue" contextRef="AsOf2021-06-30" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">26,437,424</ix:nonFraction></span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td style="width: 16%; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:CashAndCashEquivalentsAtCarryingValue" contextRef="AsOf2020-06-30" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">22,653,760</ix:nonFraction></span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_403_eus-gaap--RestrictedInvestments_iI_pp0p0_maCCERCz29N_zVPUqCGAxf5c" style="vertical-align: bottom; background-color: White">
    <td style="text-align: left; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">Money market investments,
    restricted</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:RestrictedInvestments" contextRef="AsOf2021-06-30" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">6,000,000</ix:nonFraction></span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0773">&#160;</span></span></td><td style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif">-</span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_404_eus-gaap--CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_iTI_pp0p0_mtCCERCz29N_zHaEkfeLA1P2" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="padding-left: 10pt; padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">Total</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td style="border-bottom: Black 2.5pt double; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" contextRef="AsOf2021-06-30" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">32,437,424</ix:nonFraction></span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td style="border-bottom: Black 2.5pt double; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" contextRef="AsOf2020-06-30" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">22,653,760</ix:nonFraction></span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  </table>

</ix:nonNumeric><p id="xdx_8AA_zpb3DK2tazK9" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

</ix:nonNumeric><ix:nonNumeric contextRef="From2021-01-01to2021-06-30" escape="true" name="us-gaap:EarningsPerShareTextBlock"><p id="xdx_80A_eus-gaap--EarningsPerShareTextBlock_zwTEQ6ataZc8" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><b>Note
6. <span id="xdx_822_za03PqMUoPEf">Net Loss per Common Share</span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Basic
loss per share is calculated based upon the net loss available to common shareholders divided by the weighted average number of common
shares outstanding during the period. Diluted loss per share is calculated after adjusting the denominator of the basic earnings per
share computation for the effects of all dilutive potential common shares outstanding during the period. The dilutive effects of preferred
stock, options and warrants and their equivalents are computed using the treasury stock method.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">The
total number of shares of common stock issuable upon exercise of warrants, stock option grants and equity awards were <span id="xdx_907_ecustom--NumberOfSharesOfCommonStockIssuableUponExerciseOfWarrantsAndEquityAwards_pid_c20210101__20210630_zmsnKy2rNZg4"><ix:nonFraction name="CLSN:NumberOfSharesOfCommonStockIssuableUponExerciseOfWarrantsAndEquityAwards" contextRef="From2021-01-01to2021-06-30" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">9,325,228</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">and <span id="xdx_901_ecustom--NumberOfSharesOfCommonStockIssuableUponExerciseOfWarrantsAndEquityAwards_pid_c20200101__20200630_z48gjb7JWcOk"><ix:nonFraction name="CLSN:NumberOfSharesOfCommonStockIssuableUponExerciseOfWarrantsAndEquityAwards" contextRef="From2020-01-012020-06-30" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">8,560,124</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">shares for the three and six-month periods ended
June 30, 2021 and 2020, respectively. Warrants with an exercise price of $<span id="xdx_907_eus-gaap--ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_c20210630_pdd"><ix:nonFraction name="us-gaap:ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1" contextRef="AsOf2021-06-30" format="ixt:numdotdecimal" decimals="INF" unitRef="USDPShares">0.01</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">exercisable for <span id="xdx_90F_ecustom--NumberOfSharesOfCommonStockIssuedInCalculationBasicLossPerShare_pid_c20200101__20200630_za86XsP5oyP7"><ix:nonFraction name="CLSN:NumberOfSharesOfCommonStockIssuedInCalculationBasicLossPerShare" contextRef="From2020-01-012020-06-30" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">200,000</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">shares of common stock were considered issued
in calculating basic loss per share during the first six-months of 2020. These warrants were exercised in October 2020. For the three
and six-month periods ended June 30, 2021 and 2020, diluted loss per common share was the same as basic loss per common share as the
other warrants and equity awards that were convertible into shares of the Company&#8217;s common stock were excluded from the calculation
of diluted loss per common share as their effect would have been anti-dilutive. The Company did not pay any dividends during the first
six months of 2021 or 2020.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

</ix:nonNumeric><ix:nonNumeric contextRef="From2021-01-01to2021-06-30" escape="true" name="us-gaap:InvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureTextBlock"><p id="xdx_80A_eus-gaap--InvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureTextBlock_zlpYMOEScUfh" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><b>Note
7. <span id="xdx_828_zpgEeELWxkTd">Investment in Debt Securities Available for Sale</span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Investments
in debt securities available for sale with a fair value of $<span id="xdx_901_eus-gaap--AvailableForSaleSecuritiesDebtSecuritiesCurrent_c20210630_pp0p0"><ix:nonFraction name="us-gaap:AvailableForSaleSecuritiesDebtSecuritiesCurrent" contextRef="AsOf2021-06-30" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">31,923,285</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">as of June 30, 2021, consisted of government
backed debt securities and commercial paper. These investments are valued at estimated fair value, with unrealized gains and losses reported
as a separate component of stockholders&#8217; equity in accumulated other comprehensive loss. The Company only had investments in cash
and cash equivalents on December 31, 2020.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Investments
in debt securities available for sale are evaluated periodically to determine whether a decline in their value is other than temporary.
The term &#8220;other than temporary&#8221; is not intended to indicate a permanent decline in value. Rather, it means that the prospects
for near term recovery of value are not necessarily favorable, or that there is a lack of evidence to support fair values equal to, or
greater than, the carrying value of the security. Management reviews criteria such as the magnitude and duration of the decline, as well
as the reasons for the decline, to predict whether the loss in value is other than temporary. Once a decline in value is determined to
be other than temporary, the value of the security is reduced and a corresponding charge to earnings is recognized.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<ix:nonNumeric contextRef="From2021-01-01to2021-06-30" escape="true" name="us-gaap:AvailableForSaleSecuritiesTextBlock"><p id="xdx_89A_eus-gaap--AvailableForSaleSecuritiesTextBlock_zRaide2ifxYk" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">A
summary of the cost, fair value and maturities of the Company&#8217;s short-term investments is as follows:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; display: none; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif">&#160;<span id="xdx_8BC_z87fG4UsVTe9">Schedule
of Cost, Fair Value and Maturities of Short Term Investments</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="vertical-align: bottom">
    <td style="font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="6" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">June
    30, 2021</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="6" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">December
    31, 2020</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom">
    <td style="font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">Cost</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">Fair
    Value</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">Cost</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">Fair
    Value</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">Short-term investments</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td style="width: 40%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">Commercial paper</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_98A_eus-gaap--ShortTermInvestments_c20210630__us-gaap--FinancialInstrumentAxis__us-gaap--CommercialPaperMember_pp0p0" title="Short-term investments - Cost" style="width: 11%; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:ShortTermInvestments" contextRef="AsOf2021-06-30_us-gaap_CommercialPaperMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">7,795,035</ix:nonFraction></span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_98E_eus-gaap--AvailableForSaleSecuritiesDebtSecuritiesCurrent_c20210630__us-gaap--FinancialInstrumentAxis__us-gaap--CommercialPaperMember_pp0p0" title="Short-term investments - Fair Value" style="width: 11%; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:AvailableForSaleSecuritiesDebtSecuritiesCurrent" contextRef="AsOf2021-06-30_us-gaap_CommercialPaperMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">7,792,785</ix:nonFraction></span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_980_eus-gaap--ShortTermInvestments_c20201231__us-gaap--FinancialInstrumentAxis__us-gaap--CommercialPaperMember_pp0p0" title="Short-term investments - Cost" style="width: 11%; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0793">-</span></span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_98D_eus-gaap--AvailableForSaleSecuritiesDebtSecuritiesCurrent_c20201231__us-gaap--FinancialInstrumentAxis__us-gaap--CommercialPaperMember_pp0p0" title="Short-term investments - Fair Value" style="width: 11%; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0795">-</span></span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">Government backed debt
    securities</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_985_eus-gaap--ShortTermInvestments_c20210630__us-gaap--FinancialInstrumentAxis__custom--GovernmentBackedDebtSecuritiesMember_pp0p0" title="Short-term investments - Cost" style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:ShortTermInvestments" contextRef="AsOf2021-06-30_custom_GovernmentBackedDebtSecuritiesMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">24,132,020</ix:nonFraction></span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_98A_eus-gaap--AvailableForSaleSecuritiesDebtSecuritiesCurrent_c20210630__us-gaap--FinancialInstrumentAxis__custom--GovernmentBackedDebtSecuritiesMember_pp0p0" title="Short-term investments - Fair Value" style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:AvailableForSaleSecuritiesDebtSecuritiesCurrent" contextRef="AsOf2021-06-30_custom_GovernmentBackedDebtSecuritiesMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">24,130,500</ix:nonFraction></span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span>-</td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 1.5pt solid; text-align: right">-</td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td style="font-weight: bold; padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">Total</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_986_eus-gaap--ShortTermInvestments_c20210630_pp0p0" title="Short-term investments - Cost" style="border-bottom: Black 2.5pt double; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:ShortTermInvestments" contextRef="AsOf2021-06-30" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">31,927,055</ix:nonFraction></span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_989_eus-gaap--AvailableForSaleSecuritiesDebtSecuritiesCurrent_c20210630_pp0p0" title="Short-term investments - Fair Value" style="border-bottom: Black 2.5pt double; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:AvailableForSaleSecuritiesDebtSecuritiesCurrent" contextRef="AsOf2021-06-30" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">31,923,285</ix:nonFraction></span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_981_eus-gaap--ShortTermInvestments_c20201231_pp0p0" title="Short-term investments - Cost" style="border-bottom: Black 2.5pt double; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0805">-</span></span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_98C_eus-gaap--AvailableForSaleSecuritiesDebtSecuritiesCurrent_c20201231_pp0p0" title="Short-term investments - Fair Value" style="border-bottom: Black 2.5pt double; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0807">-</span></span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  </table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="vertical-align: bottom">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="6" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">June
    30, 2021</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="6" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">December
    31, 2020</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom">
    <td style="font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">Cost</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">Fair
    Value</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">Cost</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">Fair
    Value</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">Short-term investment maturities</span></td><td style="font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td style="width: 40%"><span style="font-family: Times New Roman, Times, Serif">Within 3 months</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_985_ecustom--DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingWithinThreeMonthsAmortizedCost_c20210630_pp0p0" title="Short-term investment maturities - Within 3 months, cost" style="width: 11%; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="CLSN:DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingWithinThreeMonthsAmortizedCost" contextRef="AsOf2021-06-30" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">2,999,420</ix:nonFraction></span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_989_ecustom--DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingWithinThreeMonthsFairValue_c20210630_pp0p0" title="Short-term investment maturities - Within 3 months, fair value" style="width: 11%; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="CLSN:DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingWithinThreeMonthsFairValue" contextRef="AsOf2021-06-30" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">7,792,785</ix:nonFraction></span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_986_ecustom--DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingWithinThreeMonthsAmortizedCost_c20201231_pp0p0" title="Short-term investment maturities - Within 3 months, cost" style="width: 11%; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0813">-</span></span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_984_ecustom--DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingWithinThreeMonthsFairValue_c20201231_pp0p0" title="Short-term investment maturities - Within 3 months, fair value" style="width: 11%; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0815">-</span></span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">Between 3-12 months</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_981_ecustom--DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingBetweenThreeAndTwelveMonthsAmortizedCost_c20210630_pp0p0" title="Short-term investment maturities - Between 3-12 months, cost" style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="CLSN:DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingBetweenThreeAndTwelveMonthsAmortizedCost" contextRef="AsOf2021-06-30" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">28,927,635</ix:nonFraction></span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_98E_ecustom--DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingBetweenThreeAndTwelveMonthsFairValue_c20210630_pp0p0" title="Short-term investment maturities - Between 3-12 months, fair value" style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="CLSN:DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingBetweenThreeAndTwelveMonthsFairValue" contextRef="AsOf2021-06-30" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">24,130,500</ix:nonFraction></span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_984_ecustom--DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingBetweenThreeAndTwelveMonthsAmortizedCost_c20201231_pp0p0" title="Short-term investment maturities - Between 3-12 months, cost" style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0821">-</span></span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_98D_ecustom--DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingBetweenThreeAndTwelveMonthsFairValue_c20201231_pp0p0" title="Short-term investment maturities - Between 3-12 months, fair value" style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0823">-</span></span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td style="font-weight: bold; padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">Total</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_98B_ecustom--AvailableForSaleDebtSecuritiesAmortizedCostBasisCurrent_c20210630_pp0p0" title="Total, cost" style="border-bottom: Black 2.5pt double; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="CLSN:AvailableForSaleDebtSecuritiesAmortizedCostBasisCurrent" contextRef="AsOf2021-06-30" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">31,927,055</ix:nonFraction></span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_983_eus-gaap--AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate_c20210630_pp0p0" title="Total, fair value" style="border-bottom: Black 2.5pt double; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate" contextRef="AsOf2021-06-30" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">31,923,285</ix:nonFraction></span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_988_ecustom--AvailableForSaleDebtSecuritiesAmortizedCostBasisCurrent_c20201231_pp0p0" title="Total, cost" style="border-bottom: Black 2.5pt double; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0829">-</span></span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_980_eus-gaap--AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate_c20201231_pp0p0" title="Total, fair value" style="border-bottom: Black 2.5pt double; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0831">-</span></span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  </table>

</ix:nonNumeric><p id="xdx_8AE_zM8e9HIJINVg" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>


<ix:exclude><!-- Field: Page; Sequence: 15 -->
    <div style="border-bottom: Black 1.5pt solid; margin-bottom: 6pt"><table cellpadding="0" cellspacing="0" style="border-collapse: collapse; width: 100%; font-size: 10pt"><tr style="vertical-align: top; text-align: left"><td style="text-align: center; width: 100%"><!-- Field: Sequence; Type: Arabic; Name: PageNo -->12<!-- Field: /Sequence --></td></tr></table></div>
    <div style="break-before: page; margin-top: 6pt"><table cellpadding="0" cellspacing="0" style="border-collapse: collapse; width: 100%; font-size: 10pt"><tr style="vertical-align: top; text-align: left"><td style="text-align: center; width: 100%">&#160;</td></tr></table></div>
    <!-- Field: /Page --></ix:exclude>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<ix:nonNumeric contextRef="From2021-01-01to2021-06-30" escape="true" name="us-gaap:ScheduleOfUnrealizedLossOnInvestmentsTableTextBlock"><p id="xdx_899_eus-gaap--ScheduleOfUnrealizedLossOnInvestmentsTableTextBlock_zoRkyQc8eJSh" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">The
following table shows the Company&#8217;s investment in debt securities available for sale gross unrealized gains (losses) and fair value
by investment category and length of time that individual securities have been in a continuous unrealized loss position at June 30, 2021
and December 31, 2020. The Company has reviewed individual securities to determine whether a decline in fair value below the amortizable
cost basis is other than temporary.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; display: none; margin: 0; text-align: justify"><span id="xdx_8BD_zpnMxAxahwPg" style="font: 10pt Times New Roman, Times, Serif">Summary
of Investment Securities Gross Unrealized Gains (Losses)</span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="vertical-align: bottom">
    <td style="font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="6" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">June
    30, 2021</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="6" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">December
    31, 2020</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom">
    <td style="border-bottom: Black 1.5pt solid; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">Available
    for sale securities (all unrealized holding gains and losses are less than 12 months at date of measurement)</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">Fair
    Value</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>Unrealized
                                            Holding</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>Gains
                                            (Losses)</b></span></p></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">Fair
    Value</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>Unrealized
                                            Holding</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>Gains
                                            (Losses)</b></span></p></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="width: 44%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">Investments with unrealized gains</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_987_ecustom--AvailableForSaleSecuritiesUnrealizedGainsFairValue_iI_c20210630_z3kP7aYVfYY7" title="Investments with unrealized gains, Fair Value" style="width: 11%; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="CLSN:AvailableForSaleSecuritiesUnrealizedGainsFairValue" contextRef="AsOf2021-06-30" format="ixt:numdotdecimal" decimals="0" unitRef="USD">5,998,980</ix:nonFraction></span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_989_ecustom--AvailableForSaleSecuritiesUnrealizedHoldingGainsLessThanTwelveMonths_iI_c20210630_z73yY5dYjkJj" title="Investments with unrealized gains, Unrealized Holding Gains (Losses)" style="width: 11%; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="CLSN:AvailableForSaleSecuritiesUnrealizedHoldingGainsLessThanTwelveMonths" contextRef="AsOf2021-06-30" format="ixt:numdotdecimal" decimals="0" unitRef="USD">1,073</ix:nonFraction></span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_98E_ecustom--AvailableForSaleSecuritiesUnrealizedGainsFairValue_iI_c20201231_zEUHF5fxggM9" style="width: 9%; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0838">-</span></span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_98D_ecustom--AvailableForSaleSecuritiesUnrealizedHoldingGainsLessThanTwelveMonths_iI_c20201231_zJALWk90Uhec" style="width: 9%; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0839">-</span></span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td style="text-align: left; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">Investments with unrealized
    losses</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_98C_ecustom--AvailableForSaleSecuritiesUnrealizedLossFairValue_iI_c20210630_z9UDyW8OCJEh" title="Investments with unrealized losses, Fair Value" style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="CLSN:AvailableForSaleSecuritiesUnrealizedLossFairValue" contextRef="AsOf2021-06-30" format="ixt:numdotdecimal" decimals="0" unitRef="USD">25,924,305</ix:nonFraction></span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_989_ecustom--AvailableForSaleSecuritiesUnrealizedHoldingLossesLessThanTwelveMonths_iI_c20210630_zlbRJMBli5Vc" title="Investments with unrealized Losses, Unrealized Holding Gains (Losses)" style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif">(<ix:nonFraction name="CLSN:AvailableForSaleSecuritiesUnrealizedHoldingLossesLessThanTwelveMonths" contextRef="AsOf2021-06-30" format="ixt:numdotdecimal" decimals="0" sign="-" unitRef="USD">4,843</ix:nonFraction></span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">)</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_980_ecustom--AvailableForSaleSecuritiesUnrealizedLossFairValue_iI_c20201231_zEaBVYTqEBR" style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0844">-</span></span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_98B_ecustom--AvailableForSaleSecuritiesUnrealizedHoldingLossesLessThanTwelveMonths_iI_c20201231_zC9q5gqMTzC2" style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0845">-</span></span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="padding-left: 10pt; font-weight: bold; padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">Total</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td title="Investment securities, available for sale" id="xdx_989_eus-gaap--AvailableForSaleSecuritiesDebtSecuritiesCurrent_iI_c20210630_zd1pGBsy9UX3" style="border-bottom: Black 2.5pt double; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:AvailableForSaleSecuritiesDebtSecuritiesCurrent" contextRef="AsOf2021-06-30" format="ixt:numdotdecimal" decimals="0" unitRef="USD">31,923,285</ix:nonFraction></span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_988_ecustom--AvailableForSaleSecuritiesUnrealizedHoldingGainsLossesLessThanTwelveMonths_iI_c20210630_zklx76pw00Xl" title="Investments with unrealized Gains (Losses), Unrealized Holding Gains (Losses)" style="border-bottom: Black 2.5pt double; text-align: right"><span style="font-family: Times New Roman, Times, Serif">(<ix:nonFraction name="CLSN:AvailableForSaleSecuritiesUnrealizedHoldingGainsLossesLessThanTwelveMonths" contextRef="AsOf2021-06-30" format="ixt:numdotdecimal" decimals="0" sign="-" unitRef="USD">3,770</ix:nonFraction></span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">)</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_98E_eus-gaap--AvailableForSaleSecuritiesDebtSecuritiesCurrent_iI_pp0p0_c20201231_zitrNAaI3459" style="border-bottom: Black 2.5pt double; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0850">-</span></span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_98A_ecustom--AvailableForSaleSecuritiesUnrealizedHoldingGainsLossesLessThanTwelveMonths_iI_c20201231_zMBfZ8IjgWek" style="border-bottom: Black 2.5pt double; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0851">-</span></span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  </table>

</ix:nonNumeric><p id="xdx_8A4_zQnLlUZMRva7" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<ix:nonNumeric contextRef="From2021-01-01to2021-06-30" escape="true" name="us-gaap:InvestmentIncomeTextBlock"><p id="xdx_89F_eus-gaap--InvestmentIncomeTextBlock_zFQTOKwfKVCf" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Investment
(loss) income, which includes net realized losses on sales of available for sale securities and investment income interest and
dividends, is summarized as follows:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; display: none; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif">&#160;<span id="xdx_8B2_zeRwJVgb5CRk">Summary
of Net Realized Losses on Sales of Available for Sale Securities and Investment Income Interest and Dividends</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="display: none; vertical-align: bottom">
    <td style="text-align: center"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" id="xdx_494_20210401__20210630_zSHyDhyzLjZ6" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">2021</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" id="xdx_493_20200401__20200630_zgTSeZK7Cr9e" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">2020</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
<tr style="vertical-align: bottom">
    <td style="text-align: center"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="6" style="border-bottom: Black 1.5pt solid; text-align: center"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>Three
                                            Months Ended</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>June
                                            30,</b></span></p></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom">
    <td style="text-align: center"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">2021</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">2020</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_403_eus-gaap--InvestmentIncomeInterestAndDividend_maIINzj8E_zfdE28HysZqg" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="width: 60%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">Interest and dividends accrued
    and paid</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td style="width: 16%; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:InvestmentIncomeInterestAndDividend" contextRef="From2021-04-012021-06-30" format="ixt:numdotdecimal" decimals="0" unitRef="USD">1,436</ix:nonFraction></span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td style="width: 16%; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:InvestmentIncomeInterestAndDividend" contextRef="From2020-04-012020-06-30" format="ixt:numdotdecimal" decimals="0" unitRef="USD">18,095</ix:nonFraction></span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
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    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif">(<ix:nonFraction name="us-gaap:AvailableForSaleSecuritiesGrossRealizedGainLossNet" contextRef="From2021-04-012021-06-30" format="ixt:numdotdecimal" decimals="0" sign="-" unitRef="USD">1,785</ix:nonFraction></span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">)</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:AvailableForSaleSecuritiesGrossRealizedGainLossNet" contextRef="From2020-04-012020-06-30" format="ixt:numdotdecimal" decimals="0" unitRef="USD">2,865</ix:nonFraction></span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
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    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td style="border-bottom: Black 2.5pt double; text-align: right"><span style="font-family: Times New Roman, Times, Serif">(<ix:nonFraction name="CLSN:InvestmentIncomeLossNonoperating" contextRef="From2021-04-012021-06-30" format="ixt:numdotdecimal" decimals="0" scale="0" sign="-" unitRef="USD">349</ix:nonFraction></span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">)</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td style="border-bottom: Black 2.5pt double; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="CLSN:InvestmentIncomeLossNonoperating" contextRef="From2020-04-012020-06-30" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">20,960</ix:nonFraction></span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  </table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="display: none; vertical-align: bottom">
    <td style="text-align: center"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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<tr style="vertical-align: bottom">
    <td style="text-align: center"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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                                            Months Ended</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>June
                                            30,</b></span></p></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom">
    <td style="text-align: center"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">2021</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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  <tr id="xdx_400_eus-gaap--InvestmentIncomeInterestAndDividend_maIINz3xg_z2bCtAatVzL4" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="width: 60%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">Interest and dividends accrued
    and paid</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td style="width: 16%; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:InvestmentIncomeInterestAndDividend" contextRef="From2021-01-01to2021-06-30" format="ixt:numdotdecimal" decimals="0" unitRef="USD">3,847</ix:nonFraction></span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td style="width: 16%; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:InvestmentIncomeInterestAndDividend" contextRef="From2020-01-012020-06-30" format="ixt:numdotdecimal" decimals="0" unitRef="USD">63,172</ix:nonFraction></span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_40C_eus-gaap--AvailableForSaleSecuritiesGrossRealizedGainLossNet_maIINz3xg_zLf2CPwQ83kc" style="vertical-align: bottom; background-color: White">
    <td style="text-align: left; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">Realized (losses) gains</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif">(<ix:nonFraction name="us-gaap:AvailableForSaleSecuritiesGrossRealizedGainLossNet" contextRef="From2021-01-01to2021-06-30" format="ixt:numdotdecimal" decimals="0" sign="-" unitRef="USD">1,785</ix:nonFraction></span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">)</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:AvailableForSaleSecuritiesGrossRealizedGainLossNet" contextRef="From2020-01-012020-06-30" format="ixt:numdotdecimal" decimals="0" unitRef="USD">46,097</ix:nonFraction></span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_402_ecustom--InvestmentIncomeLossNonoperating_iT_mtIINz3xg_zXBNfvUuLAe7" style="vertical-align: bottom; background-color: White">
    <td style="text-align: left; padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">Investment income, net</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td style="border-bottom: Black 2.5pt double; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="CLSN:InvestmentIncomeLossNonoperating" contextRef="From2021-01-01to2021-06-30" format="ixt:numdotdecimal" decimals="0" unitRef="USD">2,062</ix:nonFraction></span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td style="border-bottom: Black 2.5pt double; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="CLSN:InvestmentIncomeLossNonoperating" contextRef="From2020-01-012020-06-30" format="ixt:numdotdecimal" decimals="0" unitRef="USD">109,269</ix:nonFraction></span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_40F_ecustom--InvestmentIncomeLossNonoperating_iT_mtIINz3xg_zEY8MspCTele" style="display: none; vertical-align: bottom; background-color: White">
    <td style="text-align: left; padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">Investment (loss) income,
    net</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 2.5pt double; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="CLSN:InvestmentIncomeLossNonoperating" contextRef="From2021-01-01to2021-06-30" format="ixt:numdotdecimal" decimals="0" unitRef="USD">2,062</ix:nonFraction></span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 2.5pt double; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="CLSN:InvestmentIncomeLossNonoperating" contextRef="From2020-01-012020-06-30" format="ixt:numdotdecimal" decimals="0" unitRef="USD">109,269</ix:nonFraction></span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  </table>

</ix:nonNumeric></ix:nonNumeric><p id="xdx_81E_zvVOKE868CEg" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<ix:nonNumeric contextRef="From2021-01-01to2021-06-30" escape="true" name="us-gaap:DerivativesAndFairValueTextBlock"><p id="xdx_804_eus-gaap--DerivativesAndFairValueTextBlock_zZIO6JLbLlU" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><b>Note
8. <span id="xdx_824_zNUNouQNdgKg">Fair Value Measurements</span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">FASB
ASC Section 820, <i>Fair Value Measurements and Disclosures</i> establishes a three-level hierarchy for fair value measurements which
requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. The
three levels of inputs that may be used to measure fair value are as follows:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 0.5in; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Level
1: Quoted prices (unadjusted) or identical assets or liabilities in active markets that the entity has the ability to access as of the
measurement date;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 0.5in; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 0.5in; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Level
2: Significant other observable inputs other than Level 1 prices such as quoted prices for similar assets or liabilities; quoted prices
in markets that are not active; or other inputs that are observable or can be corroborated by observable market data; and</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 0.5in; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 0.5in; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Level
3: Significant unobservable inputs that reflect a reporting entity&#8217;s own assumptions that market participants would use in pricing
an asset or liability.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Cash
and cash equivalents, other current assets, accounts payable and other accrued liabilities are reflected in the condensed consolidated
balance sheet at their approximate estimated fair values primarily due to their short-term nature. The fair values of securities available
for sale is determined by relying on the securities&#8217; relationship to other benchmark quoted securities and classified its investments
as Level 2 items in both 2021 and 2020. There were no transfers of assets or liabilities between Level 1 and Level 2 and no transfers
in or out of Level 3 during the six-months ended June 30, 2021 or during the year ended December 31, 2020. The changes
in Level 3 liabilities were the result of changes in the fair value of the earn-out milestone liability included in earnings and in-process
R&amp;D. The earnout milestone liability is valued using a risk-adjusted assessment of the probability of payment of each milestone,
discounted to present value using an estimated time to achieve the milestone (see Note 14).</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>


<ix:exclude><!-- Field: Page; Sequence: 16 -->
    <div style="border-bottom: Black 1.5pt solid; margin-bottom: 6pt"><table cellpadding="0" cellspacing="0" style="border-collapse: collapse; width: 100%; font-size: 10pt"><tr style="vertical-align: top; text-align: left"><td style="text-align: center; width: 100%"><!-- Field: Sequence; Type: Arabic; Name: PageNo -->13<!-- Field: /Sequence --></td></tr></table></div>
    <div style="break-before: page; margin-top: 6pt"><table cellpadding="0" cellspacing="0" style="border-collapse: collapse; width: 100%; font-size: 10pt"><tr style="vertical-align: top; text-align: left"><td style="text-align: center; width: 100%">&#160;</td></tr></table></div>
    <!-- Field: /Page --></ix:exclude>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<ix:nonNumeric contextRef="From2021-01-01to2021-06-30" escape="true" name="us-gaap:ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock"><p id="xdx_89D_eus-gaap--ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock_z4POuAb1LhXf" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Assets
and liabilities measured at fair value are summarized below:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;<span id="xdx_8B9_zn5uah0SSVHd" style="display: none">Schedule
of Fair Value, Assets and Liabilities Measured on Recurring Basis</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="vertical-align: bottom">
    <td style="text-align: center"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">Total
    Fair Value</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">Quoted
    Prices in Active Markets for Identical Assets/Liabilities (Level 1)</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>Significant
                                            Other Observable Inputs</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>(Level
                                            2)</b></span></p></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>Significant
                                            Unobservable Inputs</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>(Level
                                            3)</b></span></p></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td><span style="font-family: Times New Roman, Times, Serif">Assets:</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
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  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
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  <tr style="vertical-align: bottom; background-color: White">
    <td style="padding-left: 10pt; width: 40%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">Investment
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  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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  <tr style="vertical-align: bottom; background-color: White">
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    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
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  <tr style="vertical-align: bottom; background-color: White">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td><span style="font-family: Times New Roman, Times, Serif">Non-recurring items as of December 31, 2020</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td style="padding-left: 10pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">In-process R&amp;D (Note
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    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_982_eus-gaap--AvailableForSaleSecuritiesDebtSecuritiesCurrent_c20201231__us-gaap--FairValueByMeasurementFrequencyAxis__us-gaap--FairValueMeasurementsNonrecurringMember__us-gaap--FairValueByFairValueHierarchyLevelAxis__us-gaap--FairValueInputsLevel2Member__us-gaap--FinancialInstrumentAxis__custom--InprocessRandDMember_pp0p0" title="Investment securities, available for sale" style="text-align: right"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0900">&#8211;</span></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
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    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td><span style="font-family: Times New Roman, Times, Serif">Recurring items as of December 31, 2020</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
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    <td style="padding-left: 10pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">Earn-out milestone liability
    (Note 14)</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_987_eus-gaap--BusinessCombinationContingentConsiderationLiabilityNoncurrent_c20201231__us-gaap--FairValueByMeasurementFrequencyAxis__us-gaap--FairValueMeasurementsRecurringMember_pp0p0" title="Earn-out milestone liability" style="text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:BusinessCombinationContingentConsiderationLiabilityNoncurrent" contextRef="AsOf2020-12-31_us-gaap_FairValueMeasurementsRecurringMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">7,018,000</ix:nonFraction></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_98F_eus-gaap--BusinessCombinationContingentConsiderationLiabilityNoncurrent_c20201231__us-gaap--FairValueByMeasurementFrequencyAxis__us-gaap--FairValueMeasurementsRecurringMember__us-gaap--FairValueByFairValueHierarchyLevelAxis__us-gaap--FairValueInputsLevel1Member_pp0p0" title="Earn-out milestone liability" style="text-align: right"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0914">&#8211;</span></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_98C_eus-gaap--BusinessCombinationContingentConsiderationLiabilityNoncurrent_c20201231__us-gaap--FairValueByMeasurementFrequencyAxis__us-gaap--FairValueMeasurementsRecurringMember__us-gaap--FairValueByFairValueHierarchyLevelAxis__us-gaap--FairValueInputsLevel2Member_pp0p0" title="Earn-out milestone liability" style="text-align: right"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0916">&#8211;</span></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_98D_eus-gaap--BusinessCombinationContingentConsiderationLiabilityNoncurrent_c20201231__us-gaap--FairValueByMeasurementFrequencyAxis__us-gaap--FairValueMeasurementsRecurringMember__us-gaap--FairValueByFairValueHierarchyLevelAxis__us-gaap--FairValueInputsLevel3Member_pp0p0" title="Earn-out milestone liability" style="text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:BusinessCombinationContingentConsiderationLiabilityNoncurrent" contextRef="AsOf2020-12-31_us-gaap_FairValueMeasurementsRecurringMember_us-gaap_FairValueInputsLevel3Member" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">7,018,000</ix:nonFraction></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
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</ix:nonNumeric><p id="xdx_8A1_z2PtZt8SCfn" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

</ix:nonNumeric><ix:nonNumeric contextRef="From2021-01-01to2021-06-30" escape="true" name="us-gaap:IntangibleAssetsDisclosureTextBlock"><p id="xdx_804_eus-gaap--IntangibleAssetsDisclosureTextBlock_zzoxOLipmjol" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><b>Note
9. <span id="xdx_822_zYNgm3e1UdA8">Intangible Assets</span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">In
June 2014, we completed the acquisition of substantially all of the assets of EGEN, Inc., an Alabama corporation, which has changed its
company name to EGWU, Inc. after the closing of the acquisition (&#8220;EGEN&#8221;). We acquired all of EGEN&#8217;s right, title and
interest in and to substantially all of the assets of EGEN, including cash and cash equivalents, patents, trademarks and other intellectual
property rights, clinical data, certain contracts, licenses and permits, equipment, furniture, office equipment, furnishings, supplies
and other tangible personal property. In addition, CLSN Laboratories assumed certain specified liabilities of EGEN, including the liabilities
arising out of the acquired contracts and other assets relating to periods after the closing date.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><i>Acquired
In-process Research and Development</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Acquired
in-process research and development (IPR&amp;D) consists of EGEN&#8217;s drug technology platforms: TheraPlas and TheraSilence. The fair
value of the IPR&amp;D drug technology platforms was estimated to be $<span id="xdx_909_eus-gaap--IndefinitelivedIntangibleAssetsAcquired_pn5n6_c20210101__20210630__us-gaap--BusinessAcquisitionAxis__custom--EGENIncMember__dei--LegalEntityAxis__custom--IPRAndDDrugTechnologyPlatformsMember_zPvuzEz64MBa"><ix:nonFraction name="us-gaap:IndefinitelivedIntangibleAssetsAcquired" contextRef="From2021-01-012021-06-30_custom_EGENIncMember_custom_IPRAndDDrugTechnologyPlatformsMember" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">24.2</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million as of the acquisition date. As of the
closing of the acquisition, the IPR&amp;D was considered indefinite lived intangible assets and will not be amortized. IPR&amp;D is reviewed
for impairment at least annually as of our third quarter ended September 30, and whenever events or changes in circumstances indicate
that the carrying value of the assets might not be recoverable. The Company&#8217;s IPR&amp;D consisted of three core elements, its RNA
delivery system, its glioblastoma multiforme cancer (GBM) product candidate and its ovarian cancer indication.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">The
Company&#8217;s ovarian cancer indication, with original value of $<span id="xdx_906_eus-gaap--FinitelivedIntangibleAssetsAcquired1_pn5n6_c20210101__20210630__dei--LegalEntityAxis__custom--IPRAndDDrugTechnologyPlatformsMember__us-gaap--ContingentConsiderationByTypeAxis__custom--OvarianCancerMember_z1ajCb1WHJab"><ix:nonFraction name="us-gaap:FinitelivedIntangibleAssetsAcquired1" contextRef="From2021-01-012021-06-30_custom_IPRAndDDrugTechnologyPlatformsMember_custom_OvarianCancerMember" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">13.3</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million has not been impaired since its acquisition.
At September 30, 2020, the Company evaluated its IPR&amp;D of the ovarian cancer indication and concluded that it is not more likely
than not that the asset is impaired. As no other indicators of impairment existed during the fourth quarter of 2020 or first half of
2021, <span id="xdx_902_eus-gaap--AssetImpairmentCharges_pp0p0_do_c20200101__20200630__dei--LegalEntityAxis__custom--IPRAndDDrugTechnologyPlatformsMember_zJ7zEOjzxcC2">no
</span></span><span style="font: 10pt Times New Roman, Times, Serif">impairment charges were recorded during the three
or six-months ended June 30, 2021 and 2020.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">The
Company&#8217;s GBM candidate, with original value of $<span id="xdx_906_eus-gaap--AssetImpairmentCharges_pn5n6_c20180101__20181231__us-gaap--BusinessAcquisitionAxis__custom--EGENIncMember__us-gaap--ContingentConsiderationByTypeAxis__custom--GlioblastomaMultiformeBrainCancerMember_zaIkrUUgDVj1"><ix:nonFraction name="us-gaap:AssetImpairmentCharges" contextRef="From2018-01-012018-12-31_custom_EGENIncMember_custom_GlioblastomaMultiformeBrainCancerMember" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">9.4</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million had cumulative impairments through 2018
of $<span id="xdx_90C_eus-gaap--AssetImpairmentCharges_pn6n6_c20180101__20181231__us-gaap--BusinessAcquisitionAxis__custom--EGENIncMember_zgFV6MHTYqJ9"><ix:nonFraction name="us-gaap:AssetImpairmentCharges" contextRef="From2018-01-012018-12-31_custom_EGENIncMember" format="ixt:numdotdecimal" decimals="-6" scale="6" unitRef="USD">7</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million, with remaining carrying value of $<span id="xdx_909_eus-gaap--AssetImpairmentCharges_pn5n6_c20190101__20191231__us-gaap--ContingentConsiderationByTypeAxis__custom--GlioblastomaMultiformeBrainCancerMember_zM9mLehGFYvb"><ix:nonFraction name="us-gaap:AssetImpairmentCharges" contextRef="From2019-01-012019-12-31_custom_GlioblastomaMultiformeBrainCancerMember" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">2.4</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million at December 31, 2019. On September 30,
2020, the Company evaluated its IPR&amp;D for the (GBM) product candidate and concluded that it is more likely than not that the asset
is further impaired. After this assessment on September 30, 2020, the Company wrote off the remaining $<span id="xdx_907_eus-gaap--AssetImpairmentCharges_pn5n6_c20200929__20200930__us-gaap--BusinessAcquisitionAxis__custom--EGENIncMember__us-gaap--ContingentConsiderationByTypeAxis__custom--GlioblastomaMultiformeBrainCancerMember_zhIpPkbMlpC8"><ix:nonFraction name="us-gaap:AssetImpairmentCharges" contextRef="From2020-09-292020-09-30_custom_EGENIncMember_custom_GlioblastomaMultiformeBrainCancerMember" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">2.4</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million of this asset, thereby recognizing a
non-cash charge of $<span id="xdx_90F_ecustom--NoncashCharge_pn5n6_c20200701__20200930__us-gaap--BusinessAcquisitionAxis__custom--EGENIncMember__us-gaap--ContingentConsiderationByTypeAxis__custom--GlioblastomaMultiformeBrainCancerMember_zlGEsTTp0Mjh"><ix:nonFraction name="CLSN:NoncashCharge" contextRef="From2020-07-012020-09-30_custom_EGENIncMember_custom_GlioblastomaMultiformeBrainCancerMember" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">2.4</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million in the third quarter of 2020.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>


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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif"><i>&#160;</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><i>Covenants
Not to Compete</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Pursuant
to the EGEN Purchase Agreement, EGEN provided certain covenants (&#8220;Covenant Not To Compete&#8221;) to the Company whereby EGEN agreed,
during the period ending on the seventh anniversary of the closing date of the acquisition on June 20, 2014, not to enter into any business,
directly or indirectly, which competes with the business of the Company nor will it contact, solicit or approach any of the employees
of the Company for purposes of offering employment. The Covenant Not to Compete which was valued at approximately $<span id="xdx_90F_eus-gaap--FinitelivedIntangibleAssetsAcquired1_pn5n6_c20210101__20210630__us-gaap--BusinessAcquisitionAxis__custom--EGENIncMember__us-gaap--TypeOfArrangementAxis__custom--PurchaseAgreementMember_zElAFzn39hja"><ix:nonFraction name="us-gaap:FinitelivedIntangibleAssetsAcquired1" contextRef="From2021-01-012021-06-30_custom_EGENIncMember_custom_PurchaseAgreementMember" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">1.6</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million at the date of the EGEN acquisition has
a definitive life and is amortized on a straight-line basis over its life of <span id="xdx_90D_eus-gaap--FiniteLivedIntangibleAssetUsefulLife_dtY_c20210101__20210630__us-gaap--BusinessAcquisitionAxis__custom--EGENIncMember__us-gaap--TypeOfArrangementAxis__custom--PurchaseAgreementMember_zPPMeop8zcDl"><ix:nonNumeric contextRef="From2021-01-012021-06-30_custom_EGENIncMember_custom_PurchaseAgreementMember" format="ixt-sec:duryear" name="us-gaap:FiniteLivedIntangibleAssetUsefulLife">7</ix:nonNumeric>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">years. The Company recognized amortization expense
of $<span id="xdx_90B_eus-gaap--AdjustmentForAmortization_c20200101__20200630__us-gaap--BusinessAcquisitionAxis__custom--EGENIncMember__us-gaap--TypeOfArrangementAxis__custom--PurchaseAgreementMember_zyI2tWwnXl1e"><ix:nonFraction name="us-gaap:AdjustmentForAmortization" contextRef="From2020-01-012020-06-30_custom_EGENIncMember_custom_PurchaseAgreementMember" format="ixt:numdotdecimal" decimals="0" unitRef="USD">56,830</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">in each of the three and six-month periods ended
June 30, 2021 and 2020. The carrying value of the Covenant Not to Compete was fully amortized as of June 30, 2021 and $<span id="xdx_90E_eus-gaap--FiniteLivedIntangibleAssetsNet_c20201231__us-gaap--TypeOfArrangementAxis__custom--AspirePurchaseAgreementsMember_pp0p0"><ix:nonFraction name="us-gaap:FiniteLivedIntangibleAssetsNet" contextRef="AsOf2020-12-31_custom_AspirePurchaseAgreementsMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">113,660</ix:nonFraction></span></span><span style="font: 10pt Times New Roman, Times, Serif">,
net of $<span id="xdx_90C_eus-gaap--FiniteLivedIntangibleAssetsAccumulatedAmortization_c20201231__us-gaap--TypeOfArrangementAxis__custom--AspirePurchaseAgreementsMember_pp0p0"><ix:nonFraction name="us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization" contextRef="AsOf2020-12-31_custom_AspirePurchaseAgreementsMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">1,477,554</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">accumulated amortization, as of December 31,
2020.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><i>Goodwill</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">The
purchase price exceeded the estimated fair value of the net assets acquired by approximately $<span id="xdx_909_eus-gaap--GoodwillAcquiredDuringPeriod_pn5n6_c20210101__20210630__us-gaap--BusinessAcquisitionAxis__custom--EGENIncMember_z3Tt7kqvnD75"><ix:nonFraction name="us-gaap:GoodwillAcquiredDuringPeriod" contextRef="From2021-01-012021-06-30_custom_EGENIncMember" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">2.0</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million which was recorded as Goodwill. Goodwill
represents the difference between the total purchase price for the net assets purchased from EGEN and the aggregate fair values of tangible
and intangible assets acquired, less liabilities assumed. Goodwill is reviewed for impairment at least annually as of our third quarter
ended September 30 or sooner if we believe indicators of impairment exist. As of June 30, 2021, we concluded that the Company&#8217;s
fair value exceeded its carrying value therefore &#8220;it is not more likely than not&#8221; that the Goodwill was impaired.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<ix:nonNumeric contextRef="From2021-01-01to2021-06-30" escape="true" name="us-gaap:FiniteLivedAndIndefiniteLivedIntangibleAssetsAcquiredAsPartOfBusinessCombinationTableTextBlock"><p id="xdx_894_eus-gaap--FiniteLivedAndIndefiniteLivedIntangibleAssetsAcquiredAsPartOfBusinessCombinationTableTextBlock_zdYgJeGkoxUh" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Following
is a summary of the net fair value of the assets acquired in the EGEN asset acquisition for the six-month period ended June 30,
2021:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;<span id="xdx_8BB_ztRGk8i77Aa6" style="display: none">Schedule
of Fair Value of Assets Acquired</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="vertical-align: bottom">
    <td style="text-align: center"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"><span style="font-family: Times New Roman, Times, Serif">IPR&amp;D</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"><span style="font-family: Times New Roman, Times, Serif">Goodwill</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"><span style="font-family: Times New Roman, Times, Serif">Covenant
    Not To Compete</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">For the six-months ended June 30,
    2021</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td style="width: 46%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">Balance at January 1, 2021, net</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_986_eus-gaap--FiniteLivedIntangibleAssetsNet_iS_pp0p0_c20210101__20210630__us-gaap--FairValueByAssetClassAxis__custom--IPRAndDMember_zjQ3JIkxxDj7" title="Intangible assets, beginning balance" style="width: 14%; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:FiniteLivedIntangibleAssetsNet" contextRef="AsOf2020-12-31_custom_IPRAndDMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">13,366,234</ix:nonFraction></span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_98E_eus-gaap--FiniteLivedIntangibleAssetsNet_iS_pp0p0_c20210101__20210630__us-gaap--FairValueByAssetClassAxis__us-gaap--GoodwillMember_zNBWiGj7paVi" title="Intangible assets, beginning balance" style="width: 14%; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:FiniteLivedIntangibleAssetsNet" contextRef="AsOf2020-12-31_us-gaap_GoodwillMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">1,976,101</ix:nonFraction></span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_98E_eus-gaap--FiniteLivedIntangibleAssetsNet_iS_pp0p0_c20210101__20210630__us-gaap--FiniteLivedIntangibleAssetsByMajorClassAxis__us-gaap--NoncompeteAgreementsMember_zdqB8nlRBX59" title="Intangible assets, beginning balance" style="width: 14%; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:FiniteLivedIntangibleAssetsNet" contextRef="AsOf2020-12-31_us-gaap_NoncompeteAgreementsMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">113,660</ix:nonFraction></span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">Amortization</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_986_eus-gaap--AmortizationOfIntangibleAssets_iN_pp0p0_di_c20210101__20210630__us-gaap--FairValueByAssetClassAxis__custom--IPRAndDMember_z7TzeeSXjI5a" title="Amortization" style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0944">-</span></span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_98D_eus-gaap--AmortizationOfIntangibleAssets_iN_pp0p0_di_c20210101__20210630__us-gaap--FairValueByAssetClassAxis__us-gaap--GoodwillMember_zjtx3T7G2Lgi" title="Amortization" style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0946">-</span></span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_982_eus-gaap--AmortizationOfIntangibleAssets_iN_pp0p0_di_c20210101__20210630__us-gaap--FiniteLivedIntangibleAssetsByMajorClassAxis__us-gaap--NoncompeteAgreementsMember_zNQ4n0vGQP99" title="Amortization" style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif">(<ix:nonFraction name="us-gaap:AmortizationOfIntangibleAssets" contextRef="From2021-01-012021-06-30_us-gaap_NoncompeteAgreementsMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">113,660</ix:nonFraction></span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">)</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td style="text-align: left; padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">Balance at June 30,
    2021, net</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_98A_eus-gaap--FiniteLivedIntangibleAssetsNet_iE_pp0p0_c20210101__20210630__us-gaap--FairValueByAssetClassAxis__custom--IPRAndDMember_zZEW29lairU1" title="Intangible assets, ending balance" style="border-bottom: Black 2.5pt double; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:FiniteLivedIntangibleAssetsNet" contextRef="AsOf2021-06-30_custom_IPRAndDMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">13,366,234</ix:nonFraction></span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_983_eus-gaap--FiniteLivedIntangibleAssetsNet_iE_pp0p0_c20210101__20210630__us-gaap--FairValueByAssetClassAxis__us-gaap--GoodwillMember_z0nQAbP1KtYl" title="Intangible assets, ending balance" style="border-bottom: Black 2.5pt double; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:FiniteLivedIntangibleAssetsNet" contextRef="AsOf2021-06-30_us-gaap_GoodwillMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">1,976,101</ix:nonFraction></span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_98F_eus-gaap--FiniteLivedIntangibleAssetsNet_iE_pp0p0_c20210101__20210630__us-gaap--FiniteLivedIntangibleAssetsByMajorClassAxis__us-gaap--NoncompeteAgreementsMember_zr55ihcRj1a4" title="Intangible assets, ending balance" style="border-bottom: Black 2.5pt double; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0954">-</span></span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  </table>

</ix:nonNumeric><p id="xdx_8A4_z0domUgEPXS2" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

</ix:nonNumeric><ix:nonNumeric contextRef="From2021-01-01to2021-06-30" escape="true" name="us-gaap:AccountsPayableAndAccruedLiabilitiesDisclosureTextBlock"><p id="xdx_800_eus-gaap--AccountsPayableAndAccruedLiabilitiesDisclosureTextBlock_zhhv59cbBNC1" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><b>Note
10. <span id="xdx_82A_z0L6k1aaQbsc">Accrued Liabilities</span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<ix:nonNumeric contextRef="From2021-01-01to2021-06-30" escape="true" name="us-gaap:ScheduleOfAccruedLiabilitiesTableTextBlock"><p id="xdx_89D_eus-gaap--ScheduleOfAccruedLiabilitiesTableTextBlock_zOGA1Tqnz419" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Other
accrued liabilities at June 30, 2021 and December 31, 2020 include the following:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif">&#160;<span id="xdx_8BB_zWfJZ5aHNoz4" style="display: none">Schedule
of Accrued Liabilities</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="vertical-align: bottom">
    <td style="text-align: center"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" id="xdx_497_20210630_z2FDEw1SRoAa" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">June
    30, 2021</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" id="xdx_493_20201231_zBnTiuJAFtpg" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">December
    31, 2020</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom">
    <td style="text-align: center"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="text-align: center"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_401_eus-gaap--ContractualObligation_iI_pp0p0_maALCz6Sz_zfyfKVfsRMK4" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="width: 60%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">Amounts due to contract research
    organizations and other contractual agreements</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td style="width: 16%; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:ContractualObligation" contextRef="AsOf2021-06-30" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">1,189,017</ix:nonFraction></span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td style="width: 16%; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:ContractualObligation" contextRef="AsOf2020-12-31" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">636,000</ix:nonFraction></span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_40B_eus-gaap--EmployeeRelatedLiabilitiesCurrent_iI_pp0p0_maALCz6Sz_zDGQRpcFS3Gf" style="vertical-align: bottom; background-color: White">
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">Accrued payroll and related benefits</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:EmployeeRelatedLiabilitiesCurrent" contextRef="AsOf2021-06-30" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">1,016,610</ix:nonFraction></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:EmployeeRelatedLiabilitiesCurrent" contextRef="AsOf2020-12-31" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">1,736,271</ix:nonFraction></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_40F_eus-gaap--AccruedProfessionalFeesCurrent_iI_pp0p0_maALCz6Sz_zPrELNiZ4yrf" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">Accrued professional fees</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:AccruedProfessionalFeesCurrent" contextRef="AsOf2021-06-30" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">80,625</ix:nonFraction></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:AccruedProfessionalFeesCurrent" contextRef="AsOf2020-12-31" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">66,850</ix:nonFraction></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_40E_eus-gaap--InterestPayableCurrent_iI_pp0p0_maALCz6Sz_z3zsLNxSna9" style="vertical-align: bottom; background-color: White">
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">Accrued interest</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:InterestPayableCurrent" contextRef="AsOf2021-06-30" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">7,042</ix:nonFraction></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0970">&#160;</span></span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">-</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_40A_eus-gaap--OtherAccruedLiabilitiesCurrent_iI_pp0p0_maALCz6Sz_zpNKibQdMIa3" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">Other</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:OtherAccruedLiabilitiesCurrent" contextRef="AsOf2021-06-30" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">19,411</ix:nonFraction></span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:OtherAccruedLiabilitiesCurrent" contextRef="AsOf2020-12-31" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">19,411</ix:nonFraction></span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_40B_eus-gaap--AccruedLiabilitiesCurrent_iTI_pp0p0_mtALCz6Sz_zGuQO0aCjIf1" style="vertical-align: bottom; background-color: White">
    <td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">Total</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td style="border-bottom: Black 2.5pt double; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:AccruedLiabilitiesCurrent" contextRef="AsOf2021-06-30" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">2,312,705</ix:nonFraction></span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td style="border-bottom: Black 2.5pt double; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:AccruedLiabilitiesCurrent" contextRef="AsOf2020-12-31" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">2,458,532</ix:nonFraction></span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  </table>

</ix:nonNumeric><p id="xdx_8A7_zIUS3GKp6Zrf" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

</ix:nonNumeric><ix:nonNumeric contextRef="From2021-01-01to2021-06-30" escape="true" name="us-gaap:DebtDisclosureTextBlock"><p id="xdx_804_eus-gaap--DebtDisclosureTextBlock_zDBsHBsTvYFi" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><b>Note
11. <span id="xdx_82D_ztfCNB3BF8f6">Notes</span></b></span><b> <span style="font: 10pt Times New Roman, Times, Serif">Payable</span></b></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><i>The
SVB Loan Facility</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">On
June 18, 2021, the Company entered into a $<span id="xdx_906_eus-gaap--LineOfCreditFacilityMaximumBorrowingCapacity_iI_pn6n6_c20210618__us-gaap--TypeOfArrangementAxis__custom--SVBLoanFacilityMember_zYrRHKx65IX7"><ix:nonFraction name="us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity" contextRef="AsOf2021-06-18_custom_SVBLoanFacilityMember" format="ixt:numdotdecimal" decimals="-6" scale="6" unitRef="USD">10</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million loan facility (the &#8220;SVB Loan Facility&#8221;)
with Silicon Valley Bank (&#8220;SVB&#8221;). Celsion immediately used $<span id="xdx_90E_eus-gaap--ProceedsFromLinesOfCredit_pn6n6_c20210601__20210618__us-gaap--TypeOfArrangementAxis__custom--SVBLoanFacilityMember_zRkqre0767zc"><ix:nonFraction name="us-gaap:ProceedsFromLinesOfCredit" contextRef="From2021-06-012021-06-18_custom_SVBLoanFacilityMember" format="ixt:numdotdecimal" decimals="-6" scale="6" unitRef="USD">6</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million from the SVB Loan Facility to
retire all outstanding indebtedness with Horizon Technology Finance Corporation as further discussed below. Simultaneously with this
transaction, the Company used $<span id="xdx_909_eus-gaap--RestrictedCash_iI_pn6n6_c20210618__us-gaap--TypeOfArrangementAxis__custom--SVBLoanFacilityMember_zs9sNYlNZnDk" title="Restricted cash"><ix:nonFraction name="us-gaap:RestrictedCash" contextRef="AsOf2021-06-18_custom_SVBLoanFacilityMember" format="ixt:numdotdecimal" decimals="-6" scale="6" unitRef="USD">6.0</ix:nonFraction></span> million of other available funds to establish a restricted cash account which serves as security for
the SVB Loan Facility. The remaining $<span id="xdx_900_eus-gaap--LineOfCreditFacilityRemainingBorrowingCapacity_iI_pn6n6_c20210618__us-gaap--TypeOfArrangementAxis__custom--SVBLoanFacilityMember_zXeMk2yvXKAe"><ix:nonFraction name="us-gaap:LineOfCreditFacilityRemainingBorrowingCapacity" contextRef="AsOf2021-06-18_custom_SVBLoanFacilityMember" format="ixt:numdotdecimal" decimals="-6" scale="6" unitRef="USD">4</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million will be available to be drawn down up
to 12 months after closing and will be used for working capital and to fund the advancement of the Company&#8217;s product pipeline,
including GEN-1 for the treatment of newly diagnosed advanced ovarian cancer, as well as other strategic initiatives intended to broaden
its product pipeline.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>


<ix:exclude><!-- Field: Page; Sequence: 18 -->
    <div style="border-bottom: Black 1.5pt solid; margin-bottom: 6pt"><table cellpadding="0" cellspacing="0" style="border-collapse: collapse; width: 100%; font-size: 10pt"><tr style="vertical-align: top; text-align: left"><td style="text-align: center; width: 100%"><!-- Field: Sequence; Type: Arabic; Name: PageNo -->15<!-- Field: /Sequence --></td></tr></table></div>
    <div style="break-before: page; margin-top: 6pt"><table cellpadding="0" cellspacing="0" style="border-collapse: collapse; width: 100%; font-size: 10pt"><tr style="vertical-align: top; text-align: left"><td style="text-align: center; width: 100%">&#160;</td></tr></table></div>
    <!-- Field: /Page --></ix:exclude>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">The
SVB Loan Facility is in the form of money market secured indebtedness bearing interest at a calculated WSJ Prime-based variable rate
(currently <span id="xdx_901_eus-gaap--DebtInstrumentInterestRateStatedPercentage_c20210618__us-gaap--TypeOfArrangementAxis__custom--SVBLoanFacilityMember_pdd"><ix:nonFraction name="us-gaap:DebtInstrumentInterestRateStatedPercentage" contextRef="AsOf2021-06-18_custom_SVBLoanFacilityMember" format="ixt:numdotdecimal" decimals="INF" scale="-2" unitRef="Percentage">3.25</ix:nonFraction>%</span></span><span style="font: 10pt Times New Roman, Times, Serif">).
A final payment equal to <span id="xdx_907_ecustom--FinalPaymentPercentage_c20210618__us-gaap--TypeOfArrangementAxis__custom--SVBLoanFacilityMember_pdd"><ix:nonFraction name="CLSN:FinalPaymentPercentage" contextRef="AsOf2021-06-18_custom_SVBLoanFacilityMember" format="ixt:numdotdecimal" decimals="INF" scale="-2" unitRef="Percentage">3</ix:nonFraction>%
</span></span><span style="font: 10pt Times New Roman, Times, Serif">of the total $<span id="xdx_901_eus-gaap--LineOfCredit_iI_pn6n6_c20210618__us-gaap--TypeOfArrangementAxis__custom--SVBLoanFacilityMember_zDU3ysiKCWwa"><ix:nonFraction name="us-gaap:LineOfCredit" contextRef="AsOf2021-06-18_custom_SVBLoanFacilityMember" format="ixt:numdotdecimal" decimals="-6" scale="6" unitRef="USD">10</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million commitment amount is due upon maturity
or prepayment of the SVB Loan Facility. There was <span id="xdx_902_eus-gaap--LineOfCreditFacilityCommitmentFeeAmount_pp0p0_do_c20210601__20210618__us-gaap--TypeOfArrangementAxis__custom--SVBLoanFacilityMember_z7RDcVIvd7nc"><ix:nonFraction name="us-gaap:LineOfCreditFacilityCommitmentFeeAmount" contextRef="From2021-06-012021-06-18_custom_SVBLoanFacilityMember" format="ixt-sec:numwordsen" decimals="0" scale="0" unitRef="USD">no
</ix:nonFraction></span></span><span style="font: 10pt Times New Roman, Times, Serif">facility commitment fee and <span id="xdx_908_eus-gaap--DebtConversionConvertedInstrumentWarrantsOrOptionsIssued1_do_c20210601__20210618__us-gaap--TypeOfArrangementAxis__custom--SVBLoanFacilityMember_zxKtZQl2MNTj"><ix:nonFraction name="us-gaap:DebtConversionConvertedInstrumentWarrantsOrOptionsIssued1" contextRef="From2021-06-012021-06-18_custom_SVBLoanFacilityMember" format="ixt-sec:numwordsen" decimals="INF" unitRef="Shares">no
</ix:nonFraction></span></span><span style="font: 10pt Times New Roman, Times, Serif">stock or warrants were issued to SVB. <span id="xdx_903_eus-gaap--DebtInstrumentDescription_c20210601__20210618__us-gaap--TypeOfArrangementAxis__custom--SVBLoanFacilityMember"><ix:nonNumeric contextRef="From2021-06-012021-06-18_custom_SVBLoanFacilityMember" name="us-gaap:DebtInstrumentDescription">Payments
under the loan agreement are interest only for the first 24 months after loan closing, followed by a 24-month amortization period of
principal and interest through the scheduled maturity date.</ix:nonNumeric></span></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">In
connection with the SVB Loan Facility, the Company incurred financing fees and expenses totaling $<span id="xdx_90D_eus-gaap--InterestAndDebtExpense_c20210601__20210618__us-gaap--TypeOfArrangementAxis__custom--SVBLoanFacilityMember_pp0p0"><ix:nonFraction name="us-gaap:InterestAndDebtExpense" contextRef="From2021-06-012021-06-18_custom_SVBLoanFacilityMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">243,370</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">which is recorded and classified as debt discount
and are being amortized as interest expense using the effective interest method over the life of the loan. Also, in connection with the
SVB Loan Facility, the Company is required to pay an end-of-term fee equal to <span id="xdx_90C_ecustom--EndOfTermChargePercentage_c20210601__20210618__us-gaap--TypeOfArrangementAxis__custom--SVBLoanFacilityMember_pdd"><ix:nonFraction name="CLSN:EndOfTermChargePercentage" contextRef="From2021-06-012021-06-18_custom_SVBLoanFacilityMember" format="ixt:numdotdecimal" decimals="INF" scale="-2" unitRef="Percentage">3.0</ix:nonFraction>%
</span></span><span style="font: 10pt Times New Roman, Times, Serif">of the original loan amount at time of maturity.
Therefore, these amounts totaling $<span id="xdx_907_eus-gaap--AmortizationOfFinancingCosts_pp0p0_c20210601__20210618__us-gaap--TypeOfArrangementAxis__custom--SVBLoanFacilityMember_zfrGpoPgCuj4"><ix:nonFraction name="us-gaap:AmortizationOfFinancingCosts" contextRef="From2021-06-012021-06-18_custom_SVBLoanFacilityMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">300,000</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">were being amortized as interest expense using
the effective interest method over the life of the loan. During the three and six-month periods ended June 30, 2021, the Company incurred
$<span id="xdx_90C_eus-gaap--InterestExpenseDebt_c20210101__20210630__us-gaap--TypeOfArrangementAxis__custom--SVBLoanFacilityMember_pp0p0"><ix:nonFraction name="us-gaap:InterestExpenseDebt" contextRef="From2021-01-012021-06-30_custom_SVBLoanFacilityMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">7,042</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">in interest expense and amortized $<span id="xdx_906_eus-gaap--AmortizationOfFinancingCostsAndDiscounts_pp0p0_c20210101__20210630__us-gaap--TypeOfArrangementAxis__custom--SVBLoanFacilityMember_zCD8P5Rm7fWd"><ix:nonFraction name="us-gaap:AmortizationOfFinancingCostsAndDiscounts" contextRef="From2021-01-012021-06-30_custom_SVBLoanFacilityMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">6,457</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">as interest expense for debt discounts and end-of-term
fee in connection with the SVB Financing Facility.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<ix:nonNumeric contextRef="From2021-01-01to2021-06-30" escape="true" name="us-gaap:ScheduleOfMaturitiesOfLongTermDebtTableTextBlock"><p id="xdx_89B_eus-gaap--ScheduleOfMaturitiesOfLongTermDebtTableTextBlock_zA0OrhEcHcg5" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Following
is a schedule of future principal payments, net of unamortized debt discounts and amortized end-of-term fee, due on the SVB Loan
Facility:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;<span id="xdx_8B9_z1LBw1ybetAj" style="display: none">Schedule
of Future Principle Payments, Net of Unamortized Debt Discounts</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; margin-left: auto; border-collapse: collapse; width: 80%; margin-right: auto">
  <tr style="vertical-align: bottom">
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" id="xdx_49B_20210630_zRN0y04DfbZ2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">As
    of June 30,</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_406_eus-gaap--LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths_iI_pp0p0_maDICAzd4S_zGpQzPb0URLc" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">2022</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0998">&#8211;</span></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_401_eus-gaap--LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo_iI_pp0p0_maDICAzd4S_z9GgFD7BPiOi" style="vertical-align: bottom; background-color: White">
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">2023</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl1000">&#8211;</span></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_408_eus-gaap--LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree_iI_pp0p0_maDICAzd4S_zpMClawZJ8k4" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="width: 80%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">2024</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="width: 16%; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree" contextRef="AsOf2021-06-30" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">3,000,000</ix:nonFraction></span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_408_ecustom--LongTermDebtMaturitiesRepaymentsOfPrincipalYearFourAndThereAfter_iI_pp0p0_maDICAzd4S_z7o7oasIwqk7" style="vertical-align: bottom; background-color: White">
    <td style="text-align: left; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">2025 and</span><span style="font-family: Times New Roman, Times, Serif">
    thereafter</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="CLSN:LongTermDebtMaturitiesRepaymentsOfPrincipalYearFourAndThereAfter" contextRef="AsOf2021-06-30" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">3,000,000</ix:nonFraction></span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_409_eus-gaap--DebtInstrumentCarryingAmount_iTI_pp0p0_mtDICAzd4S_maLTDzrgw_zqnRyTti7kw9" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">Subtotal of future principal payments</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:DebtInstrumentCarryingAmount" contextRef="AsOf2021-06-30" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">6,000,000</ix:nonFraction></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_400_eus-gaap--DeferredFinanceCostsNet_iNI_pp0p0_di_msLTDzrgw_zccsqLc8FVH" style="vertical-align: bottom; background-color: White">
    <td style="text-align: left; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">Unamortized debt premium,
    net</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif">(<ix:nonFraction name="us-gaap:DeferredFinanceCostsNet" contextRef="AsOf2021-06-30" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">236,913</ix:nonFraction></span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">)</span></td></tr>
  <tr id="xdx_401_eus-gaap--LongTermDebt_iTI_pp0p0_mtLTDzrgw_zXoiqTV25pye" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="padding-left: 10pt; text-align: left; padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">Total</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td style="border-bottom: Black 2.5pt double; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:LongTermDebt" contextRef="AsOf2021-06-30" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">5,763,087</ix:nonFraction></span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  </table>

</ix:nonNumeric><p id="xdx_8A9_zy9OfBhf7rOi" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><i>Horizon
Credit Agreement</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">On
June 27, 2018, the Company entered into a loan agreement with Horizon Technology Finance Corporation (&#8220;Horizon&#8221;) that provided
$<span id="xdx_903_eus-gaap--LineOfCreditFacilityMaximumBorrowingCapacity_iI_pn6n6_c20180627__us-gaap--TypeOfArrangementAxis__custom--InitialHorizonCreditAgreementMember_zkfQB5GOdQAc"><ix:nonFraction name="us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity" contextRef="AsOf2018-06-27_custom_InitialHorizonCreditAgreementMember" format="ixt:numdotdecimal" decimals="-6" scale="6" unitRef="USD">10</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million in new capital (the &#8220;Horizon Credit
Agreement&#8221;). The Company drew down $<span id="xdx_904_eus-gaap--ProceedsFromLinesOfCredit_pn6n6_c20180626__20180627__us-gaap--TypeOfArrangementAxis__custom--InitialHorizonCreditAgreementMember_z966F2N1lnT6"><ix:nonFraction name="us-gaap:ProceedsFromLinesOfCredit" contextRef="From2018-06-262018-06-27_custom_InitialHorizonCreditAgreementMember" format="ixt:numdotdecimal" decimals="-6" scale="6" unitRef="USD">10</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million upon closing of the Horizon Credit Agreement
on June 27, 2018. On August 28, 2020, Horizon and the Company amended the Horizon Credit Agreement (the &#8220;Amendment&#8221;) whereby
Celsion repaid $<span id="xdx_90E_eus-gaap--RepaymentsOfNotesPayable_pn6n6_c20200827__20200828__us-gaap--TypeOfArrangementAxis__custom--AmendmentToHorizonCreditAgreementMember__dei--LegalEntityAxis__custom--HorizonTechnologyFinanceCorporationMember_zuJUbukFi259"><ix:nonFraction name="us-gaap:RepaymentsOfNotesPayable" contextRef="From2020-08-272020-08-28_custom_AmendmentToHorizonCreditAgreementMember_custom_HorizonTechnologyFinanceCorporationMember" format="ixt:numdotdecimal" decimals="-6" scale="6" unitRef="USD">5</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million of the $10 million loan and $<span id="xdx_905_ecustom--PaymentOfDebtEndTermCharges_pn5n6_c20200827__20200828__us-gaap--TypeOfArrangementAxis__custom--AmendmentToHorizonCreditAgreementMember__dei--LegalEntityAxis__custom--HorizonTechnologyFinanceCorporationMember_z7jYmIYCWGV1"><ix:nonFraction name="CLSN:PaymentOfDebtEndTermCharges" contextRef="From2020-08-272020-08-28_custom_AmendmentToHorizonCreditAgreementMember_custom_HorizonTechnologyFinanceCorporationMember" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">0.2</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million in related end of term charges, and the
remaining $<span id="xdx_90C_eus-gaap--LineOfCreditFacilityRemainingBorrowingCapacity_iI_pn6n6_c20180627__us-gaap--TypeOfArrangementAxis__custom--InitialHorizonCreditAgreementMember_zlsIXpBRHX2d"><ix:nonFraction name="us-gaap:LineOfCreditFacilityRemainingBorrowingCapacity" contextRef="AsOf2018-06-27_custom_InitialHorizonCreditAgreementMember" format="ixt:numdotdecimal" decimals="-6" scale="6" unitRef="USD">5</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million in obligations were restructured as set
forth below.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Pursuant
to the Amendment, the remaining $<span id="xdx_908_eus-gaap--DebtInstrumentFaceAmount_iI_pn6n6_c20200828__us-gaap--TypeOfArrangementAxis__custom--AmendmentToHorizonCreditAgreementMember__dei--LegalEntityAxis__custom--HorizonTechnologyFinanceCorporationMember_zce3TW5sOzha"><ix:nonFraction name="us-gaap:DebtInstrumentFaceAmount" contextRef="AsOf2020-08-28_custom_AmendmentToHorizonCreditAgreementMember_custom_HorizonTechnologyFinanceCorporationMember" format="ixt:numdotdecimal" decimals="-6" scale="6" unitRef="USD">5</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million in obligations of Celsion under the Horizon
Credit Agreement was secured by a first-priority security interest in substantially all assets of Celsion other than intellectual
property assets. <span id="xdx_90A_eus-gaap--DebtInstrumentInterestRateTerms_c20200827__20200828__us-gaap--TypeOfArrangementAxis__custom--AmendmentToHorizonCreditAgreementMember__dei--LegalEntityAxis__custom--HorizonTechnologyFinanceCorporationMember_zH8QZJ3kIg7g"><ix:nonNumeric contextRef="From2020-08-272020-08-28_custom_AmendmentToHorizonCreditAgreementMember_custom_HorizonTechnologyFinanceCorporationMember" name="us-gaap:DebtInstrumentInterestRateTerms">The
obligations bore interest at a rate calculated based an amount by which the one-month LIBOR exceeds 2% plus 7.625%. In no event
shall the interest rate be less than 9.625%. Payments pursuant to the Amendment were interest only for the first twelve (12) months
after August 1, 2020, followed by a 21-month amortization period of principal and interest through the scheduled maturity date on April
1, 2023. In addition, the remaining $5 million in obligations was subject to an end of term fee equal, in the aggregate, to $</ix:nonNumeric></span></span><span id="xdx_902_eus-gaap--DebtInstrumentFeeAmount_c20200828__us-gaap--TypeOfArrangementAxis__custom--AmendmentToHorizonCreditAgreementMember__dei--LegalEntityAxis__custom--HorizonTechnologyFinanceCorporationMember_pp0p0" style="font: 10pt Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:DebtInstrumentFeeAmount" contextRef="AsOf2020-08-28_custom_AmendmentToHorizonCreditAgreementMember_custom_HorizonTechnologyFinanceCorporationMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">275,000</ix:nonFraction></span><span style="font: 10pt Times New Roman, Times, Serif">,
which amount was payable upon the maturity of the obligations or upon the date of final payment or default, as applicable. <span id="xdx_90C_eus-gaap--DebtInstrumentRestrictiveCovenants_c20200827__20200828__us-gaap--TypeOfArrangementAxis__custom--AmendmentToHorizonCreditAgreementMember__dei--LegalEntityAxis__custom--HorizonTechnologyFinanceCorporationMember"><ix:nonNumeric contextRef="From2020-08-272020-08-28_custom_AmendmentToHorizonCreditAgreementMember_custom_HorizonTechnologyFinanceCorporationMember" name="us-gaap:DebtInstrumentRestrictiveCovenants">In
connection with the Amendment, Celsion agreed to a liquidity covenant which provides that, at all times, Celsion shall maintain unrestricted
cash and/or cash equivalents on deposit in accounts over which the applicable Lenders maintain an account control agreement in an amount
not less than $2.5 million. In addition, pursuant to the Amendment, Celsion agreed to provide evidence to Horizon on or before March
31, 2021, that it received aggregate cash proceeds of not less than $5 million from the sale of equity, debt, its New Jersey net operating
losses, or a combination thereof, subsequent to the date of the Amendment.</ix:nonNumeric></span></span> <span style="font: 10pt Times New Roman, Times, Serif">The
Company met this requirement during the fourth quarter of 2020.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">In
connection with the Horizon Credit Agreement, the Company incurred financing fees and expenses totaling $<span id="xdx_90C_eus-gaap--InterestAndDebtExpense_c20180626__20180627__us-gaap--TypeOfArrangementAxis__custom--InitialHorizonCreditAgreementMember_pp0p0"><ix:nonFraction name="us-gaap:InterestAndDebtExpense" contextRef="From2018-06-262018-06-27_custom_InitialHorizonCreditAgreementMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">175,000</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">which were recorded and classified as debt discount.
In addition, the Company paid loan origination fees of $<span id="xdx_90F_eus-gaap--LoanProcessingFee_c20180626__20180627__us-gaap--TypeOfArrangementAxis__custom--InitialHorizonCreditAgreementMember_pp0p0"><ix:nonFraction name="us-gaap:LoanProcessingFee" contextRef="From2018-06-262018-06-27_custom_InitialHorizonCreditAgreementMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">100,000</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">which were recorded and classified as debt discount.
These debt discount amounts totaling $<span id="xdx_90D_eus-gaap--DebtInstrumentUnamortizedDiscount_c20180627__us-gaap--TypeOfArrangementAxis__custom--InitialHorizonCreditAgreementMember_pp0p0"><ix:nonFraction name="us-gaap:DebtInstrumentUnamortizedDiscount" contextRef="AsOf2018-06-27_custom_InitialHorizonCreditAgreementMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">782,116</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">were being amortized as interest expense using
the effective interest method over the life of the loan. Also, in connection with each of the Horizon Credit Agreement, the Company was
required to pay an end of term charge equal to <span id="xdx_905_ecustom--EndOfTermChargePercentage_c20180626__20180627__us-gaap--TypeOfArrangementAxis__custom--InitialHorizonCreditAgreementMember_pdd"><ix:nonFraction name="CLSN:EndOfTermChargePercentage" contextRef="From2018-06-262018-06-27_custom_InitialHorizonCreditAgreementMember" format="ixt:numdotdecimal" decimals="INF" scale="-2" unitRef="Percentage">4.0</ix:nonFraction>%
</span></span><span style="font: 10pt Times New Roman, Times, Serif">of the original loan amount at time of maturity.
Therefore, those amounts totaling $<span id="xdx_909_eus-gaap--DeferredFinanceCostsNet_c20180627__us-gaap--TypeOfArrangementAxis__custom--InitialHorizonCreditAgreementMember_pp0p0"><ix:nonFraction name="us-gaap:DeferredFinanceCostsNet" contextRef="AsOf2018-06-27_custom_InitialHorizonCreditAgreementMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">400,000</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">were being amortized as interest expense using
the effective interest method over the life of the loan.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>


<ix:exclude><!-- Field: Page; Sequence: 19 -->
    <div style="border-bottom: Black 1.5pt solid; margin-bottom: 6pt"><table cellpadding="0" cellspacing="0" style="border-collapse: collapse; width: 100%; font-size: 10pt"><tr style="vertical-align: top; text-align: left"><td style="text-align: center; width: 100%"><!-- Field: Sequence; Type: Arabic; Name: PageNo -->16<!-- Field: /Sequence --></td></tr></table></div>
    <div style="break-before: page; margin-top: 6pt"><table cellpadding="0" cellspacing="0" style="border-collapse: collapse; width: 100%; font-size: 10pt"><tr style="vertical-align: top; text-align: left"><td style="text-align: center; width: 100%">&#160;</td></tr></table></div>
    <!-- Field: /Page --></ix:exclude>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">As
a fee in connection with the Horizon Credit Agreement, Celsion issued Horizon warrants exercisable for a total of <span id="xdx_904_eus-gaap--ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights_c20180627__us-gaap--TypeOfArrangementAxis__custom--InitialHorizonCreditAgreementMember__us-gaap--StatementEquityComponentsAxis__us-gaap--CommonStockMember_pdd"><ix:nonFraction name="us-gaap:ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights" contextRef="AsOf2018-06-27_custom_InitialHorizonCreditAgreementMember_us-gaap_CommonStockMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">190,114</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">shares of Celsion&#8217;s common stock (the &#8220;Existing
Warrants&#8221;) at a per share exercise price of $<span id="xdx_907_eus-gaap--ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_c20180627__us-gaap--TypeOfArrangementAxis__custom--InitialHorizonCreditAgreementMember__us-gaap--StatementEquityComponentsAxis__us-gaap--CommonStockMember_pdd"><ix:nonFraction name="us-gaap:ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1" contextRef="AsOf2018-06-27_custom_InitialHorizonCreditAgreementMember_us-gaap_CommonStockMember" format="ixt:numdotdecimal" decimals="INF" unitRef="USDPShares">2.63</ix:nonFraction></span></span><span style="font: 10pt Times New Roman, Times, Serif">.
The Horizon Warrants were immediately exercisable for cash or by net exercise from the date of grant and will expire after ten years
from the date of grant. The Company valued the Horizon Warrants issued using the Black-Scholes option pricing model and recorded a total
of $<span id="xdx_90B_eus-gaap--FairValueAdjustmentOfWarrants_c20180626__20180627__us-gaap--TypeOfArrangementAxis__custom--InitialHorizonCreditAgreementMember_pp0p0"><ix:nonFraction name="us-gaap:FairValueAdjustmentOfWarrants" contextRef="From2018-06-262018-06-27_custom_InitialHorizonCreditAgreementMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">507,116</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">as a direct deduction from the debt liability,
consistent with the presentation of debt discounts, and are being amortized as interest expense using the effective interest method over
the life of the loan. Pursuant to the Amendment, one-half of the aggregate Existing Warrants, exercisable for a total of <span id="xdx_903_ecustom--ClassOfWarrantOrRightWarrantsOrRightsCancelled_c20200828__us-gaap--TypeOfArrangementAxis__custom--AmendmentToHorizonCreditAgreementMember__dei--LegalEntityAxis__custom--HorizonTechnologyFinanceCorporationMember__us-gaap--StatementEquityComponentsAxis__us-gaap--CommonStockMember_pdd"><ix:nonFraction name="CLSN:ClassOfWarrantOrRightWarrantsOrRightsCancelled" contextRef="AsOf2020-08-28_custom_AmendmentToHorizonCreditAgreementMember_custom_HorizonTechnologyFinanceCorporationMember_us-gaap_CommonStockMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">95,057</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">shares of Celsion&#8217;s common stock, have
been canceled, and, in connection with the Amendment, Celsion issued Horizon new warrants exercisable at a per share exercise price equal
to $<span id="xdx_906_eus-gaap--ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_c20200828__us-gaap--TypeOfArrangementAxis__custom--AmendmentToHorizonCreditAgreementMember__dei--LegalEntityAxis__custom--HorizonTechnologyFinanceCorporationMember__us-gaap--StatementEquityComponentsAxis__us-gaap--CommonStockMember_pdd"><ix:nonFraction name="us-gaap:ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1" contextRef="AsOf2020-08-28_custom_AmendmentToHorizonCreditAgreementMember_custom_HorizonTechnologyFinanceCorporationMember_us-gaap_CommonStockMember" format="ixt:numdotdecimal" decimals="INF" unitRef="USDPShares">1.01</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">for a total of <span id="xdx_904_eus-gaap--ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights_c20200828__us-gaap--TypeOfArrangementAxis__custom--AmendmentToHorizonCreditAgreementMember__dei--LegalEntityAxis__custom--HorizonTechnologyFinanceCorporationMember__us-gaap--StatementEquityComponentsAxis__us-gaap--CommonStockMember_pdd"><ix:nonFraction name="us-gaap:ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights" contextRef="AsOf2020-08-28_custom_AmendmentToHorizonCreditAgreementMember_custom_HorizonTechnologyFinanceCorporationMember_us-gaap_CommonStockMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">247,525</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">shares of Celsion&#8217;s common stock (the &#8220;New
Warrants&#8221; and, together with the Existing Warrants, the &#8220;Warrants&#8221;). The remaining <span id="xdx_904_eus-gaap--ClassOfWarrantOrRightOutstanding_c20180627__us-gaap--TypeOfArrangementAxis__custom--InitialHorizonCreditAgreementMember__us-gaap--StatementEquityComponentsAxis__us-gaap--CommonStockMember_pdd"><ix:nonFraction name="us-gaap:ClassOfWarrantOrRightOutstanding" contextRef="AsOf2018-06-27_custom_InitialHorizonCreditAgreementMember_us-gaap_CommonStockMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">95,057</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">Existing Warrants issued in connection with the
Horizon Credit Agreement remain outstanding at a per share exercise price of $2.63.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">The
New Warrants were immediately exercisable for cash or by net exercise from the date of grant and will expire after ten years from
the date of grant. Effective October 27, 2020. The Horizon Credit Agreement contains customary representations, warranties and affirmative
and negative covenants including, among other things, covenants that limit or restrict Celsion&#8217;s ability to grant liens, incur
indebtedness, make certain restricted payments, merge, or consolidate and make dispositions of assets.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">The
Amendment was evaluated in accordance with FASB ASC 470-50, <i>Debt-Modifications and Extinguishments</i>, for debt modification and
extinguishment accounting. We accounted for the $<span id="xdx_904_eus-gaap--PaymentsOfDebtExtinguishmentCosts_pn6n6_c20200827__20200828__us-gaap--TypeOfArrangementAxis__custom--AmendmentToHorizonCreditAgreementMember__dei--LegalEntityAxis__custom--HorizonTechnologyFinanceCorporationMember_zAUWcpet6Cdl"><ix:nonFraction name="us-gaap:PaymentsOfDebtExtinguishmentCosts" contextRef="From2020-08-272020-08-28_custom_AmendmentToHorizonCreditAgreementMember_custom_HorizonTechnologyFinanceCorporationMember" format="ixt:numdotdecimal" decimals="-6" scale="6" unitRef="USD">5</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million we repaid as a debt extinguishment thereby
reducing the principal obligations accordingly. Also, in connection with the $5 million repayment, we recognized as interest expense,
approximately $<span id="xdx_909_eus-gaap--DebtInstrumentUnamortizedDiscount_iI_pn5n6_c20200828__us-gaap--TypeOfArrangementAxis__custom--AmendmentToHorizonCreditAgreementMember__dei--LegalEntityAxis__custom--HorizonTechnologyFinanceCorporationMember_zUp1qgaGEWKk"><ix:nonFraction name="us-gaap:DebtInstrumentUnamortizedDiscount" contextRef="AsOf2020-08-28_custom_AmendmentToHorizonCreditAgreementMember_custom_HorizonTechnologyFinanceCorporationMember" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">0.2</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million of unamortized debt discount, deferred
financing and end of term fees related to the repaid obligation in August 2020.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">We
accounted for the remaining $5 million of obligation under the Amendment as a debt modification to the initial agreement with respect
to the minor changes in cash flows. Also, in connection with the $5 million remaining obligations, we recorded $<span id="xdx_905_eus-gaap--DeferredFinanceCostsNet_c20200828__us-gaap--TypeOfArrangementAxis__custom--AmendmentToHorizonCreditAgreementMember__dei--LegalEntityAxis__custom--HorizonTechnologyFinanceCorporationMember_pp0p0"><ix:nonFraction name="us-gaap:DeferredFinanceCostsNet" contextRef="AsOf2020-08-28_custom_AmendmentToHorizonCreditAgreementMember_custom_HorizonTechnologyFinanceCorporationMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">5,000</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">of financing fees and the New Warrant fair value
of $<span id="xdx_90B_eus-gaap--WarrantsNotSettleableInCashFairValueDisclosure_c20200828__us-gaap--TypeOfArrangementAxis__custom--AmendmentToHorizonCreditAgreementMember__dei--LegalEntityAxis__custom--HorizonTechnologyFinanceCorporationMember_pp0p0"><ix:nonFraction name="us-gaap:WarrantsNotSettleableInCashFairValueDisclosure" contextRef="AsOf2020-08-28_custom_AmendmentToHorizonCreditAgreementMember_custom_HorizonTechnologyFinanceCorporationMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">247,548</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">as additional debt discount on the $5 million
remaining obligation. Therefore, approximately $<span id="xdx_902_eus-gaap--DebtInstrumentUnamortizedDiscount_c20210630__us-gaap--TypeOfArrangementAxis__custom--AmendmentToHorizonCreditAgreementMember__dei--LegalEntityAxis__custom--HorizonTechnologyFinanceCorporationMember_pp0p0"><ix:nonFraction name="us-gaap:DebtInstrumentUnamortizedDiscount" contextRef="AsOf2021-06-30_custom_AmendmentToHorizonCreditAgreementMember_custom_HorizonTechnologyFinanceCorporationMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">109,706</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">of unamortized debt discount will be amortized
over the remaining life of the new obligations. The $<span id="xdx_903_ecustom--EndOfTermFees_c20180626__20180627__us-gaap--TypeOfArrangementAxis__custom--InitialHorizonCreditAgreementMember_pp0p0"><ix:nonFraction name="CLSN:EndOfTermFees" contextRef="From2018-06-262018-06-27_custom_InitialHorizonCreditAgreementMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">275,000</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">of end of term fees, net of previously amortized
end of term fees totaling $<span id="xdx_908_eus-gaap--DebtInstrumentFeeAmount_c20180627__us-gaap--TypeOfArrangementAxis__custom--InitialHorizonCreditAgreementMember_pp0p0"><ix:nonFraction name="us-gaap:DebtInstrumentFeeAmount" contextRef="AsOf2018-06-27_custom_InitialHorizonCreditAgreementMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">142,605</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">previously accrued on the original note associated
with the $5 million remaining obligation, will be amortized as interest expense over the remaining life of the new obligations.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">During
the three and six-month periods ended June 30, 2021, the Company incurred $<span id="xdx_905_eus-gaap--InterestExpenseDebt_pp0p0_c20210401__20210630__us-gaap--DebtInstrumentAxis__custom--InitialHorizonCreditAgreementAmendmentMember_zz3mrabrYijj"><ix:nonFraction name="us-gaap:InterestExpenseDebt" contextRef="From2021-04-012021-06-30_custom_InitialHorizonCreditAgreementAmendmentMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">105,607</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">and $<span id="xdx_906_eus-gaap--InterestExpenseDebt_pp0p0_c20210101__20210630__us-gaap--DebtInstrumentAxis__custom--InitialHorizonCreditAgreementAmendmentMember_zoXmKKqJxf3"><ix:nonFraction name="us-gaap:InterestExpenseDebt" contextRef="From2021-01-012021-06-30_custom_InitialHorizonCreditAgreementAmendmentMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">225,920</ix:nonFraction></span></span><span style="font: 10pt Times New Roman, Times, Serif">,
respectively, in interest expense and amortized $<span id="xdx_908_eus-gaap--AmortizationOfFinancingCosts_pp0p0_c20210401__20210630__us-gaap--DebtInstrumentAxis__custom--InitialHorizonCreditAgreementAmendmentMember_zx6z5ZvsQLYf"><ix:nonFraction name="us-gaap:AmortizationOfFinancingCosts" contextRef="From2021-04-012021-06-30_custom_InitialHorizonCreditAgreementAmendmentMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">102,126</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">and $<span id="xdx_906_eus-gaap--AmortizationOfFinancingCosts_c20210101__20210630__us-gaap--DebtInstrumentAxis__custom--InitialHorizonCreditAgreementAmendmentMember_pp0p0"><ix:nonFraction name="us-gaap:AmortizationOfFinancingCosts" contextRef="From2021-01-012021-06-30_custom_InitialHorizonCreditAgreementAmendmentMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">139,428</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">as interest expense for debt discounts and end
of term charges in connection with the Horizon Credit Agreement. During the three and six-month periods ended June 30, 2020, the Company
incurred $<span id="xdx_907_eus-gaap--InterestExpenseDebt_pp0p0_c20200401__20200630__us-gaap--DebtInstrumentAxis__custom--InitialHorizonCreditAgreementAmendmentMember_z8a6wbHwmch1"><ix:nonFraction name="us-gaap:InterestExpenseDebt" contextRef="From2020-04-012020-06-30_custom_InitialHorizonCreditAgreementAmendmentMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">243,299</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">and $<span id="xdx_90C_eus-gaap--InterestExpenseDebt_c20200101__20200630__us-gaap--DebtInstrumentAxis__custom--InitialHorizonCreditAgreementAmendmentMember_pp0p0"><ix:nonFraction name="us-gaap:InterestExpenseDebt" contextRef="From2020-01-012020-06-30_custom_InitialHorizonCreditAgreementAmendmentMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">486,597</ix:nonFraction></span></span><span style="font: 10pt Times New Roman, Times, Serif">,
respectively, in interest expense and amortized $<span id="xdx_906_eus-gaap--AmortizationOfFinancingCosts_pp0p0_c20200401__20200630__us-gaap--DebtInstrumentAxis__custom--InitialHorizonCreditAgreementAmendmentMember_zXVN04mODJ1i"><ix:nonFraction name="us-gaap:AmortizationOfFinancingCosts" contextRef="From2020-04-012020-06-30_custom_InitialHorizonCreditAgreementAmendmentMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">96,727</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">and $<span id="xdx_904_eus-gaap--AmortizationOfFinancingCosts_c20200101__20200630__us-gaap--DebtInstrumentAxis__custom--InitialHorizonCreditAgreementAmendmentMember_pp0p0"><ix:nonFraction name="us-gaap:AmortizationOfFinancingCosts" contextRef="From2020-01-012020-06-30_custom_InitialHorizonCreditAgreementAmendmentMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">192,793</ix:nonFraction></span></span><span style="font: 10pt Times New Roman, Times, Serif">,
respectfully, as interest expense for debt discounts and end of term charges in connection with the Horizon Credit Agreement.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<ix:nonNumeric contextRef="From2021-01-01to2021-06-30" escape="true" name="us-gaap:ScheduleOfDebtTableTextBlock"><p id="xdx_899_eus-gaap--ScheduleOfDebtTableTextBlock_zxTOtvYAFLbl" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">On
June 18, 2021, as a condition of entering into the SVB Loan Facility, the Company paid the outstanding principal balance,
an early termination fee and the end of term charges in full satisfaction of the Horizon Credit Agreement, as amended.
Following is a schedule of the amounts paid to Horizon on June 18, 2021.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;<span id="xdx_8BB_zkVw8gEY8R8b" style="display: none">Schedule
of Debt</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; margin-left: auto; border-collapse: collapse; width: 80%; margin-right: auto">
  <tr style="vertical-align: bottom; background-color: White">
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
<tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="width: 80%"><span style="font-family: Times New Roman, Times, Serif">Principal balance at June 18, 2021</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_98A_eus-gaap--LineOfCredit_iS_pp0p0_c20210619__20210630__dei--LegalEntityAxis__custom--HorizonTechnologyFinanceCorporationMember_zAmYhkUZFuhk" title="Line of credit, beginning balance" style="width: 16%; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:LineOfCredit" contextRef="AsOf2021-06-18_custom_HorizonTechnologyFinanceCorporationMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">5,000,000</ix:nonFraction></span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">Early termination fees</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_985_ecustom--EarlyTerminationFees_c20210619__20210630__dei--LegalEntityAxis__custom--HorizonTechnologyFinanceCorporationMember_zgVnQaVJ4SS5" title="Early termination fees" style="text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="CLSN:EarlyTerminationFees" contextRef="From2021-06-192021-06-30_custom_HorizonTechnologyFinanceCorporationMember" format="ixt:numdotdecimal" decimals="0" unitRef="USD">150,000</ix:nonFraction></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">End of term charges</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_98D_ecustom--EndOfTermFees_pp0p0_c20210619__20210630__dei--LegalEntityAxis__custom--HorizonTechnologyFinanceCorporationMember_zMGjpuyzQG2i" title="End of term charges" style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="CLSN:EndOfTermFees" contextRef="From2021-06-192021-06-30_custom_HorizonTechnologyFinanceCorporationMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">275,000</ix:nonFraction></span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td style="padding-left: 10pt; padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">Total</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_986_eus-gaap--LineOfCredit_iE_pp0p0_c20210619__20210630__dei--LegalEntityAxis__custom--HorizonTechnologyFinanceCorporationMember_zD1y3El5W0k4" title="Line of credit, ending balance" style="border-bottom: Black 2.5pt double; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:LineOfCredit" contextRef="AsOf2021-06-30_custom_HorizonTechnologyFinanceCorporationMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">5,425,000</ix:nonFraction></span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  </table>

</ix:nonNumeric><p id="xdx_8AC_zWYHsRZk7bzd" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">During
the three and six months ended June 30, 2021, the Company recorded a loss of $<span id="xdx_907_eus-gaap--GainLossOnContractTermination_c20210101__20210630__us-gaap--TypeOfArrangementAxis__custom--HorizonCreditAgreementMember_pp0p0"><ix:nonFraction name="us-gaap:GainLossOnContractTermination" contextRef="From2021-01-012021-06-30_custom_HorizonCreditAgreementMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">234,419</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">on the termination of the Horizon Credit Agreement,
as amended, which represented the early termination fee and the end of term fees, net of previously amortized interest expense totaling
$<span id="xdx_90A_eus-gaap--InterestExpenseDebt_c20210101__20210630__us-gaap--TypeOfArrangementAxis__custom--HorizonCreditAgreementMember_pp0p0"><ix:nonFraction name="us-gaap:InterestExpenseDebt" contextRef="From2021-01-012021-06-30_custom_HorizonCreditAgreementMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">190,581</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">on the date of its payoff.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

</ix:nonNumeric><ix:nonNumeric contextRef="From2021-01-01to2021-06-30" escape="true" name="us-gaap:StockholdersEquityNoteDisclosureTextBlock"><p id="xdx_80B_eus-gaap--StockholdersEquityNoteDisclosureTextBlock_z4i556ELqwRh" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><b>Note
12. <span id="xdx_827_zwrisun1hGC8">Stockholders&#8217; Equity</span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">In
September 2018, the Company filed with the SEC a $<span id="xdx_90F_ecustom--ShelfRegistrationStatementAmount_pn6n6_c20180901__20180930_z6kOyeRMUEy6"><ix:nonFraction name="CLSN:ShelfRegistrationStatementAmount" contextRef="From2018-09-012018-09-30" format="ixt:numdotdecimal" decimals="-6" scale="6" unitRef="USD">75</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million shelf registration statement on Form
S-3 (the 2018 Shelf Registration Statement) that allows the Company to issue any combination of common stock, preferred stock or warrants
to purchase common stock or preferred stock. This shelf registration was declared effective on October 12, 2018, and was
fully utilized by the end of January 2021.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>


<ix:exclude><!-- Field: Page; Sequence: 20 -->
    <div style="border-bottom: Black 1.5pt solid; margin-bottom: 6pt"><table cellpadding="0" cellspacing="0" style="border-collapse: collapse; width: 100%; font-size: 10pt"><tr style="vertical-align: top; text-align: left"><td style="text-align: center; width: 100%"><!-- Field: Sequence; Type: Arabic; Name: PageNo -->17<!-- Field: /Sequence --></td></tr></table></div>
    <div style="break-before: page; margin-top: 6pt"><table cellpadding="0" cellspacing="0" style="border-collapse: collapse; width: 100%; font-size: 10pt"><tr style="vertical-align: top; text-align: left"><td style="text-align: center; width: 100%">&#160;</td></tr></table></div>
    <!-- Field: /Page --></ix:exclude>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">On
March 19, 2021, the Company filed with the SEC a new $<span id="xdx_907_ecustom--ShelfRegistrationStatementAmount_pn6n6_c20210318__20210319_zBrO5S5vboV8"><ix:nonFraction name="CLSN:ShelfRegistrationStatementAmount" contextRef="From2021-03-182021-03-19" format="ixt:numdotdecimal" decimals="-6" scale="6" unitRef="USD">100</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million shelf registration statement on Form
S-3 (the &#8220;2021 Registration Statement&#8221;) that allows the Company to issue any combination of common stock, preferred stock
or warrants to purchase common stock or preferred stock. This shelf registration was declared effective on March 30, 2021.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><i><span style="text-decoration: underline">Capital
on Demand<sup>TM</sup> Sales Agreement</span></i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">On
December 4, 2018, the Company entered into the Capital on Demand Agreement with JonesTrading, pursuant to which the Company may offer
and sell, from time to time, through JonesTrading shares of Common Stock having an aggregate offering price of up to $<span id="xdx_905_ecustom--AggregateOfferingPrices_pn5n6_c20181202__20181204__us-gaap--TypeOfArrangementAxis__custom--CapitalOnDemandTMSalesAgreementMember_zjxEhECp5K63"><ix:nonFraction name="CLSN:AggregateOfferingPrices" contextRef="From2018-12-022018-12-04_custom_CapitalOnDemandTMSalesAgreementMember" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">16.0</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">During
2020 through June 30, 2020, the Company sold and issued an aggregate of <span id="xdx_906_eus-gaap--StockIssuedDuringPeriodSharesNewIssues_pn5n6_c20200101__20200630__us-gaap--TypeOfArrangementAxis__custom--CapitalOnDemandAgreementMember_zSm2pkR5U73i"><ix:nonFraction name="us-gaap:StockIssuedDuringPeriodSharesNewIssues" contextRef="From2020-01-012020-06-30_custom_CapitalOnDemandAgreementMember" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="Shares">1.2</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million shares under the Capital on Demand
Agreement, receiving approximately $<span id="xdx_900_eus-gaap--ProceedsFromIssuanceOfCommonStock_pn5n6_c20200101__20200630__us-gaap--TypeOfArrangementAxis__custom--CapitalOnDemandAgreementMember_zCADWbcV9O0h"><ix:nonFraction name="us-gaap:ProceedsFromIssuanceOfCommonStock" contextRef="From2020-01-012020-06-30_custom_CapitalOnDemandAgreementMember" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">3.5</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million in gross proceeds. During the first
half of 2021, the Company sold <span id="xdx_906_eus-gaap--StockIssuedDuringPeriodSharesNewIssues_pn5n6_c20210101__20210331__us-gaap--TypeOfArrangementAxis__custom--CapitalOnDemandAgreementMember_zHPWaFmPEmU"><ix:nonFraction name="us-gaap:StockIssuedDuringPeriodSharesNewIssues" contextRef="From2021-01-012021-03-31_custom_CapitalOnDemandAgreementMember" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="Shares">7.2</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million shares under the Capital on Demand Agreement,
receiving approximately $<span id="xdx_905_eus-gaap--ProceedsFromIssuanceOfCommonStock_pn5n6_c20210101__20210331__us-gaap--TypeOfArrangementAxis__custom--CapitalOnDemandAgreementMember_zXHcc671V5Pg"><ix:nonFraction name="us-gaap:ProceedsFromIssuanceOfCommonStock" contextRef="From2021-01-012021-03-31_custom_CapitalOnDemandAgreementMember" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">6.9</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million in gross proceeds under the Capital on
Demand Agreement.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><i><span style="text-decoration: underline">Registered
Direct Offering</span></i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">On
February 27, 2020, we entered into a Securities Purchase Agreement (the &#8220;February 2020 Purchase Agreement&#8221;) with several
institutional investors, pursuant to which we agreed to issue and sell, in a registered direct offering (the &#8220;February 2020
Offering&#8221;), an aggregate of <span id="xdx_90F_eus-gaap--StockIssuedDuringPeriodSharesNewIssues_pid_c20200226__20200227__us-gaap--TypeOfArrangementAxis__custom--SecuritiesPurchaseAgreementMember_zUAhIVI0k3lb"><ix:nonFraction name="us-gaap:StockIssuedDuringPeriodSharesNewIssues" contextRef="From2020-02-262020-02-27_custom_SecuritiesPurchaseAgreementMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">4,571,428</ix:nonFraction> </span></span><span style="font: 10pt Times New Roman, Times, Serif">shares
of our common stock at an offering price of $<span id="xdx_90A_eus-gaap--SharesIssuedPricePerShare_iI_pid_c20200227__us-gaap--TypeOfArrangementAxis__custom--SecuritiesPurchaseAgreementMember_zQxwlSRowZd2"><ix:nonFraction name="us-gaap:SharesIssuedPricePerShare" contextRef="AsOf2020-02-27_custom_SecuritiesPurchaseAgreementMember" format="ixt:numdotdecimal" decimals="INF" unitRef="USDPShares">1.05</ix:nonFraction> </span></span><span style="font: 10pt Times New Roman, Times, Serif">per
Share for gross proceeds of approximately $<span id="xdx_905_eus-gaap--ProceedsFromIssuanceOfCommonStock_pn5n6_c20200226__20200227__us-gaap--TypeOfArrangementAxis__custom--SecuritiesPurchaseAgreementMember_zoT3KNK5lUu5"><ix:nonFraction name="us-gaap:ProceedsFromIssuanceOfCommonStock" contextRef="From2020-02-262020-02-27_custom_SecuritiesPurchaseAgreementMember" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">4.8</ix:nonFraction> </span></span><span style="font: 10pt Times New Roman, Times, Serif">million
before the deduction of the Placement Agent fees and offering expenses. In a concurrent private placement (the &#8220;Private
Placement&#8221;), the Company issued to the investors that participated in the February 2020 Offering, for no additional
consideration, warrants to purchase up to <span id="xdx_90C_eus-gaap--ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight_c20200227__us-gaap--TypeOfArrangementAxis__custom--SecuritiesPurchaseAgreementMember__us-gaap--StatementEquityComponentsAxis__custom--OriginalWarrantsMember_pdd"><ix:nonFraction name="us-gaap:ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight" contextRef="AsOf2020-02-27_custom_SecuritiesPurchaseAgreementMember_custom_OriginalWarrantsMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">2,971,428</ix:nonFraction> </span></span><span style="font: 10pt Times New Roman, Times, Serif">shares
of common stock (the &#8220;Original Warrants&#8221;). The Original Warrants were initially exercisable six months following their
date of issue and were set to expire on the <span id="xdx_903_eus-gaap--WarrantsAndRightsOutstandingTerm_iI_dxL_c20200227__us-gaap--TypeOfArrangementAxis__custom--SecuritiesPurchaseAgreementMember__us-gaap--StatementEquityComponentsAxis__custom--OriginalWarrantsMember_zLhLDfQ92Fj" title="::XDX::P5Y"><span style="-sec-ix-hidden: xdx2ixbrl1072">five-year</span></span></span><span style="font: 10pt Times New Roman, Times, Serif">
anniversary of such initial exercise date. The Original Warrants had an exercise price of $<span id="xdx_907_eus-gaap--ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_iI_pid_c20200227__us-gaap--TypeOfArrangementAxis__custom--SecuritiesPurchaseAgreementMember__us-gaap--StatementEquityComponentsAxis__custom--OriginalWarrantsMember_zzQ0oUkx6I1e"><ix:nonFraction name="us-gaap:ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1" contextRef="AsOf2020-02-27_custom_SecuritiesPurchaseAgreementMember_custom_OriginalWarrantsMember" format="ixt:numdotdecimal" decimals="INF" unitRef="USDPShares">1.15</ix:nonFraction> </span></span><span style="font: 10pt Times New Roman, Times, Serif">per
share subject to adjustment as provided therein. On March 12, 2020, the Company entered into private exchange agreements (the
&#8220;Exchange Agreements&#8221;) with holders of the Original Warrants. Pursuant to the Exchange Agreements, in return for a
higher exercise price of $<span id="xdx_90D_eus-gaap--ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_iI_pid_c20200312__us-gaap--TypeOfArrangementAxis__custom--ExchangeAgreementsMember__us-gaap--StatementEquityComponentsAxis__us-gaap--WarrantMember_zmBGdzB62lid"><ix:nonFraction name="us-gaap:ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1" contextRef="AsOf2020-03-12_custom_ExchangeAgreementsMember_us-gaap_WarrantMember" format="ixt:numdotdecimal" decimals="INF" unitRef="USDPShares">1.24</ix:nonFraction> </span></span><span style="font: 10pt Times New Roman, Times, Serif">per
share of common stock, the Company issued new warrants to the Investors to purchase up to <span id="xdx_904_eus-gaap--ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight_iI_pid_c20200312__us-gaap--TypeOfArrangementAxis__custom--ExchangeAgreementsMember__us-gaap--StatementEquityComponentsAxis__us-gaap--WarrantMember_zDxruSt2GUpl"><ix:nonFraction name="us-gaap:ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight" contextRef="AsOf2020-03-12_custom_ExchangeAgreementsMember_us-gaap_WarrantMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">3,200,000</ix:nonFraction> </span></span><span style="font: 10pt Times New Roman, Times, Serif">shares
of common stock (the &#8220;Exchange Warrants&#8221;) in exchange for the Original Warrants. The Exchange Warrants, like the
Original Warrants, are initially exercisable six months following their issuance (the &#8220;Initial Exercise Date&#8221;) and
expire on the <span id="xdx_90A_eus-gaap--WarrantsAndRightsOutstandingTerm_iI_dxL_c20200312__us-gaap--TypeOfArrangementAxis__custom--ExchangeAgreementsMember__us-gaap--StatementEquityComponentsAxis__us-gaap--WarrantMember_zvInSFBdHo4c" title="::XDX::P5Y"><span style="-sec-ix-hidden: xdx2ixbrl1076">five-year</span></span></span><span style="font: 10pt Times New Roman, Times, Serif">
anniversary of their Initial Exercise Date. Other than having a higher exercise price, different issue date, Initial Exercise Date
and expiration date, the terms of the Exchange Warrants are identical to those of the Original Warrants. On July 31, 2020, the
Company filed a Form S-3 Registration Statement to register the shares of common stock issuable under the Exchange Warrants; the
Registration Statement was declared effective by the SEC on August 13, 2020. No Exchange Warrants were exercised during 2020. During
2021 through the date of this Quarterly Report on Form 10-Q, the Company issued <span id="xdx_90D_eus-gaap--ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight_iI_pn5n6_c20210630__us-gaap--TypeOfArrangementAxis__custom--ExchangeAgreementsMember_zfIt5TJCsBY6"><ix:nonFraction name="us-gaap:ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight" contextRef="AsOf2021-06-30_custom_ExchangeAgreementsMember" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="Shares">1.2</ix:nonFraction> </span></span><span style="font: 10pt Times New Roman, Times, Serif">million
shares pursuant to investors exercising Exchange Warrants, receiving approximately $<span id="xdx_90C_eus-gaap--ProceedsFromIssuanceOfWarrants_pn5n6_c20210101__20210630__us-gaap--TypeOfArrangementAxis__custom--ExchangeAgreementsMember_zTmpheC7YDWj"><ix:nonFraction name="us-gaap:ProceedsFromIssuanceOfWarrants" contextRef="From2021-01-012021-06-30_custom_ExchangeAgreementsMember" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">1.5</ix:nonFraction> </span></span><span style="font: 10pt Times New Roman, Times, Serif">million in
net proceeds.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><i><span style="text-decoration: underline">Underwritten
Offering</span></i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">On
June 22, 2020, the Company entered into an underwriting agreement (the &#8220;Underwriting Agreement&#8221;) with Oppenheimer &amp; Co.
Inc. (the &#8220;Underwriter&#8221;), relating to the issuance and sale (the &#8220;Underwritten Offering&#8221;) of <span id="xdx_90A_eus-gaap--StockIssuedDuringPeriodSharesNewIssues_c20200621__20200622__us-gaap--TypeOfArrangementAxis__custom--UnderwritingAgreementMember__us-gaap--SubsidiarySaleOfStockAxis__custom--UnderwrittenOfferingMember_zuYZrzK0hDlb"><ix:nonFraction name="us-gaap:StockIssuedDuringPeriodSharesNewIssues" contextRef="From2020-06-212020-06-22_custom_UnderwritingAgreementMember_custom_UnderwrittenOfferingMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">2,666,667</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">shares of the Company&#8217;s common stock. Pursuant
to the terms of the Underwriting Agreement, the Underwriter agreed to purchase the shares at a price of $<span id="xdx_903_eus-gaap--SharePrice_c20200622__us-gaap--TypeOfArrangementAxis__custom--UnderwritingAgreementMember__us-gaap--SubsidiarySaleOfStockAxis__custom--UnderwrittenOfferingMember_pdd"><ix:nonFraction name="us-gaap:SharePrice" contextRef="AsOf2020-06-22_custom_UnderwritingAgreementMember_custom_UnderwrittenOfferingMember" format="ixt:numdotdecimal" decimals="INF" unitRef="USDPShares">3.4875</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">per share. The Underwriter offered the shares
at a public offering price of $<span id="xdx_907_eus-gaap--SharesIssuedPricePerShare_c20200622__us-gaap--TypeOfArrangementAxis__custom--UnderwritingAgreementMember__us-gaap--SubsidiarySaleOfStockAxis__custom--UnderwrittenOfferingMember_pdd"><ix:nonFraction name="us-gaap:SharesIssuedPricePerShare" contextRef="AsOf2020-06-22_custom_UnderwritingAgreementMember_custom_UnderwrittenOfferingMember" format="ixt:numdotdecimal" decimals="INF" unitRef="USDPShares">3.75</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">per share, reflecting an underwriting discount
equal to $<span id="xdx_909_ecustom--UnderwritingDiscountPricePerShare_c20200621__20200622__us-gaap--TypeOfArrangementAxis__custom--UnderwritingAgreementMember__us-gaap--SubsidiarySaleOfStockAxis__custom--UnderwrittenOfferingMember_pdd"><ix:nonFraction name="CLSN:UnderwritingDiscountPricePerShare" contextRef="From2020-06-212020-06-22_custom_UnderwritingAgreementMember_custom_UnderwrittenOfferingMember" format="ixt:numdotdecimal" decimals="INF" unitRef="USDPShares">0.2625</ix:nonFraction></span></span><span style="font: 10pt Times New Roman, Times, Serif">,
or <span id="xdx_90E_ecustom--PercentageOfUnderwritingDiscountOnPublicOfferingPrice_c20200621__20200622__us-gaap--TypeOfArrangementAxis__custom--UnderwritingAgreementMember__us-gaap--SubsidiarySaleOfStockAxis__custom--UnderwrittenOfferingMember_pdd"><ix:nonFraction name="CLSN:PercentageOfUnderwritingDiscountOnPublicOfferingPrice" contextRef="From2020-06-212020-06-22_custom_UnderwritingAgreementMember_custom_UnderwrittenOfferingMember" format="ixt:numdotdecimal" decimals="INF" scale="-2" unitRef="Percentage">7.0</ix:nonFraction>%
</span></span><span style="font: 10pt Times New Roman, Times, Serif">of the public offering price. The net proceeds
to the Company from the Underwritten Offering, after deducting the underwriting discount and estimated offering expenses payable by the
Company, were approximately $<span id="xdx_900_eus-gaap--ProceedsFromIssuanceOfCommonStock_pn5n6_c20200621__20200622__us-gaap--TypeOfArrangementAxis__custom--UnderwritingAgreementMember__us-gaap--SubsidiarySaleOfStockAxis__custom--UnderwrittenOfferingMember_zQIpLXo9Qdhi"><ix:nonFraction name="us-gaap:ProceedsFromIssuanceOfCommonStock" contextRef="From2020-06-212020-06-22_custom_UnderwritingAgreementMember_custom_UnderwrittenOfferingMember" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">9.1</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Pursuant
to the Underwriting Agreement, until December 31, 2020, the Underwriter had a right of first refusal to act as sole underwriter, initial
purchaser, placement/selling agent, or arranger, as the case may be, on any new financing for the Company (excluding equipment lease
financings, loans or grants from governmental authorities or in connection with government programs and financings relating to or sales
of tax attributes) during such period. The Underwriter common stock the sole right to determine whether or not any other broker dealer
shall have the right to participate in any such offering and the economic terms of any such participation.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><i><span style="text-decoration: underline">January
2021 Registered Direct Offering</span></i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">On
January 22, 2021, the Company entered into a Securities Purchase Agreement (the &#8220;January 2021 Purchase Agreement&#8221;) with several
institutional investors, pursuant to which the Company agreed to issue and sell, in a registered direct offering (the &#8220;January
2021 Offering&#8221;), an aggregate of <span id="xdx_900_eus-gaap--StockIssuedDuringPeriodSharesNewIssues_pid_c20210121__20210122__us-gaap--TypeOfArrangementAxis__custom--UnderwritingAgreementMember__us-gaap--SubsidiarySaleOfStockAxis__custom--JanuaryRegisteredDirectOfferingMember_zasU5swSYTMh"><ix:nonFraction name="us-gaap:StockIssuedDuringPeriodSharesNewIssues" contextRef="From2021-01-212021-01-22_custom_UnderwritingAgreementMember_custom_JanuaryRegisteredDirectOfferingMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">25,925,925</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">shares of the Company&#8217;s common stock at
an offering price of $<span id="xdx_904_eus-gaap--SharePrice_iI_pid_c20210122__us-gaap--TypeOfArrangementAxis__custom--UnderwritingAgreementMember__us-gaap--SubsidiarySaleOfStockAxis__custom--JanuaryRegisteredDirectOfferingMember_zr11OwB61xAk"><ix:nonFraction name="us-gaap:SharePrice" contextRef="AsOf2021-01-22_custom_UnderwritingAgreementMember_custom_JanuaryRegisteredDirectOfferingMember" format="ixt:numdotdecimal" decimals="INF" unitRef="USDPShares">1.35</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">per share for gross proceeds of approximately
$<span id="xdx_907_eus-gaap--ProceedsFromIssuanceOfCommonStock_pn6n6_c20210121__20210122__us-gaap--TypeOfArrangementAxis__custom--UnderwritingAgreementMember__us-gaap--SubsidiarySaleOfStockAxis__custom--JanuaryRegisteredDirectOfferingMember_zd15X3MYAhDf"><ix:nonFraction name="us-gaap:ProceedsFromIssuanceOfCommonStock" contextRef="From2021-01-212021-01-22_custom_UnderwritingAgreementMember_custom_JanuaryRegisteredDirectOfferingMember" format="ixt:numdotdecimal" decimals="-6" scale="6" unitRef="USD">35</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million before the deduction of the January 2021
Placement Agents (as defined below) fee and offering expenses. The January 2021 Purchase Agreement contains customary representations,
warranties and agreements by the Company and customary conditions to closing. The closing of the January 2021 Offering occurred on January
26, 2021.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>


<ix:exclude><!-- Field: Page; Sequence: 21 -->
    <div style="border-bottom: Black 1.5pt solid; margin-bottom: 6pt"><table cellpadding="0" cellspacing="0" style="border-collapse: collapse; width: 100%; font-size: 10pt"><tr style="vertical-align: top; text-align: left"><td style="text-align: center; width: 100%"><!-- Field: Sequence; Type: Arabic; Name: PageNo -->18<!-- Field: /Sequence --></td></tr></table></div>
    <div style="break-before: page; margin-top: 6pt"><table cellpadding="0" cellspacing="0" style="border-collapse: collapse; width: 100%; font-size: 10pt"><tr style="vertical-align: top; text-align: left"><td style="text-align: center; width: 100%">&#160;</td></tr></table></div>
    <!-- Field: /Page --></ix:exclude>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span id="xdx_907_ecustom--PlacementAgentFeeDescription_c20210121__20210122__us-gaap--TypeOfArrangementAxis__custom--UnderwritingAgreementMember__us-gaap--SubsidiarySaleOfStockAxis__custom--JanuaryRegisteredDirectOfferingMember" style="font: 10pt Times New Roman, Times, Serif"><ix:nonNumeric contextRef="From2021-01-212021-01-22_custom_UnderwritingAgreementMember_custom_JanuaryRegisteredDirectOfferingMember" name="CLSN:PlacementAgentFeeDescription">In
connection with the January 2021 Offering, the Company entered into a placement agent agreement (the &#8220;January 2021 Placement Agent
Agreement&#8221;) with A.G.P./Alliance Global Partners (together with Brookline Capital Markets, the &#8220;January 2021 Placement Agents&#8221;)
pursuant to which the Company agreed to pay the January 2021 Placement Agents a cash fee equal to 7% of the aggregate gross proceeds
raised from the sale of the securities sold in the January 2021 Offering and reimburse the January 2021 Placement Agents for certain
of their expenses in an amount not to exceed $82,500.</ix:nonNumeric></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><i><span style="text-decoration: underline">March
2021 Registered Direct Offering</span></i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">On
March 31, 2021, the Company entered into a Securities Purchase Agreement (the &#8220;March 2021 Purchase Agreement&#8221;) with several
institutional investors, pursuant to which the Company agreed to issue and sell, in a registered direct offering (the &#8220;March 2021
Offering&#8221;), an aggregate of <span id="xdx_90F_eus-gaap--StockIssuedDuringPeriodSharesNewIssues_pid_c20210301__20210331__us-gaap--TypeOfArrangementAxis__custom--UnderwritingAgreementMember__us-gaap--SubsidiarySaleOfStockAxis__custom--MarchRegisteredDirectOfferingMember_zdtgwFzakQy9"><ix:nonFraction name="us-gaap:StockIssuedDuringPeriodSharesNewIssues" contextRef="From2021-03-012021-03-31_custom_UnderwritingAgreementMember_custom_MarchRegisteredDirectOfferingMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">11,538,462</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">shares of the Company&#8217;s common stock, at
an offering price of $<span id="xdx_904_eus-gaap--SharePrice_iI_pid_c20210331__us-gaap--TypeOfArrangementAxis__custom--UnderwritingAgreementMember__us-gaap--SubsidiarySaleOfStockAxis__custom--MarchRegisteredDirectOfferingMember_z7sC1OPpVPib"><ix:nonFraction name="us-gaap:SharePrice" contextRef="AsOf2021-03-31_custom_UnderwritingAgreementMember_custom_MarchRegisteredDirectOfferingMember" format="ixt:numdotdecimal" decimals="INF" unitRef="USDPShares">1.30</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">per share for gross proceeds of approximately
$<span id="xdx_90B_eus-gaap--ProceedsFromIssuanceOfCommonStock_pn6n6_c20210301__20210331__us-gaap--TypeOfArrangementAxis__custom--UnderwritingAgreementMember__us-gaap--SubsidiarySaleOfStockAxis__custom--MarchRegisteredDirectOfferingMember_zXxKK5h5EZul"><ix:nonFraction name="us-gaap:ProceedsFromIssuanceOfCommonStock" contextRef="From2021-03-012021-03-31_custom_UnderwritingAgreementMember_custom_MarchRegisteredDirectOfferingMember" format="ixt:numdotdecimal" decimals="-6" scale="6" unitRef="USD">15</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million before the deduction of the placement
agents fee and offering expenses. The shares were offered by the Company pursuant to the 2021 Registration Statement. The closing of
the Offering occurred on April 5, 2021.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span id="xdx_908_ecustom--PlacementAgentFeeDescription_c20210301__20210331__us-gaap--TypeOfArrangementAxis__custom--UnderwritingAgreementMember__us-gaap--SubsidiarySaleOfStockAxis__custom--MarchRegisteredDirectOfferingMember_zNVsqgMVK1J7" style="font: 10pt Times New Roman, Times, Serif"><ix:nonNumeric contextRef="From2021-03-012021-03-31_custom_UnderwritingAgreementMember_custom_MarchRegisteredDirectOfferingMember" name="CLSN:PlacementAgentFeeDescription">In
connection with the March 2021 Offering, the Company entered into a placement agent agreement (the &#8220;March 2021 Placement Agent
Agreement&#8221;) with A.G.P./Alliance Global Partners, as lead placement agent (&#8220;AGP,&#8221; and together with JonesTrading Institutional
Services LLC and Brookline Capital Markets, a division of Arcadia Securities, LLC, serving as co-placement agents, the &#8220;March 2021
Placement Agents&#8221;) pursuant to which the Company agreed to pay the March 2021 Placement Agents an aggregate cash fee equal to 7%
of the aggregate gross proceeds raised from the sale of the securities sold in the Offering and reimburse the Placement Agents for certain
of their expenses in an amount not to exceed $82,500.</ix:nonNumeric></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Under
the March 2021 Purchase Agreement and March 2021 Placement Agent Agreement, the Company and its subsidiaries are prohibited, for a period
of 90 days after the closing, from entering into any agreement to issue or announcing any issuance or proposed issuance of common stock
or any other securities that are at any time convertible into, or exercisable or exchangeable for, or otherwise entitle the holder thereof
to receive common stock without the prior written consent of AGP or the investors participating in the offering. For purposes of this
offering, AGP and the investors from the Company&#8217;s January 2021 Offering waived a similar 90-day restriction in the placement agent
agreement and purchase agreement for that transaction.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><i><span style="text-decoration: underline">LPC
Purchase Agreement</span></i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">On
September 8, 2020, the Company entered into a purchase agreement (the &#8220;LPC Purchase Agreement&#8221;) and a Registration Rights
Agreement (the &#8220;Registration Rights Agreement&#8221;) with Lincoln Park Capital Fund, LLC (&#8220;Lincoln Park&#8221;), pursuant
to which, upon the terms and subject to the conditions and limitations set forth therein, the Company has the right to sell to Lincoln
Park up to $<span id="xdx_905_eus-gaap--StockIssuedDuringPeriodSharesNewIssues_pn5n6_c20200907__20200908__us-gaap--TypeOfArrangementAxis__custom--LPCPurchaseAgreementMember__dei--LegalEntityAxis__custom--LincolnParkCapitalFundLLCMember_zjznHtlrf8kh"><ix:nonFraction name="us-gaap:StockIssuedDuringPeriodSharesNewIssues" contextRef="From2020-09-072020-09-08_custom_LPCPurchaseAgreementMember_custom_LincolnParkCapitalFundLLCMember" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="Shares">26.0</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million of shares of the Company&#8217;s common
stock at the Company&#8217;s discretion as described below (the &#8220;LPC Offering&#8221;). During 2020, the Company sold and issued
an aggregate of <span id="xdx_90C_eus-gaap--StockIssuedDuringPeriodSharesNewIssues_pn5n6_c20200101__20201231__us-gaap--TypeOfArrangementAxis__custom--LPCPurchaseAgreementMember__dei--LegalEntityAxis__custom--LincolnParkCapitalFundLLCMember_z85zqYLDSQCd"><ix:nonFraction name="us-gaap:StockIssuedDuringPeriodSharesNewIssues" contextRef="From2020-01-012020-12-31_custom_LPCPurchaseAgreementMember_custom_LincolnParkCapitalFundLLCMember" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="Shares">3.3</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million shares, including the <span id="xdx_905_eus-gaap--StockIssuedDuringPeriodSharesNewIssues_c20200907__20200908__us-gaap--TypeOfArrangementAxis__custom--LPCPurchaseAgreementMember__dei--LegalEntityAxis__custom--LincolnParkCapitalFundLLCMember__us-gaap--StatementEquityComponentsAxis__custom--LPCCommitmentSharesMember_pdd"><ix:nonFraction name="us-gaap:StockIssuedDuringPeriodSharesNewIssues" contextRef="From2020-09-072020-09-08_custom_LPCPurchaseAgreementMember_custom_LincolnParkCapitalFundLLCMember_custom_LPCCommitmentSharesMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">437,828</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">commitment shares, under the LPC Purchase Agreement,
receiving approximately $<span id="xdx_90F_eus-gaap--ProceedsFromIssuanceOfCommonStock_pn5n6_c20200101__20201231__us-gaap--TypeOfArrangementAxis__custom--LPCPurchaseAgreementMember__dei--LegalEntityAxis__custom--LincolnParkCapitalFundLLCMember_ztWQLGUmWN6"><ix:nonFraction name="us-gaap:ProceedsFromIssuanceOfCommonStock" contextRef="From2020-01-012020-12-31_custom_LPCPurchaseAgreementMember_custom_LincolnParkCapitalFundLLCMember" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">2.2</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million in gross proceeds. On January
21, 2021, the Company terminated the LPC Purchase Agreement. The Company did not sell any shares under the LPC Purchase Agreement
in 2021.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

</ix:nonNumeric><ix:nonNumeric contextRef="From2021-01-01to2021-06-30" escape="true" name="us-gaap:DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock"><p id="xdx_80A_eus-gaap--DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_zlOPbZ1JNyq4" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><b>Note
13. <span id="xdx_827_z8STTSt0mLsi">Stock-Based Compensation</span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">The
Company has long-term compensation plans that permit the granting of equity-based awards in the form of stock options, restricted stock,
restricted stock units, stock appreciation rights, other stock awards, and performance awards.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">At
the 2018 Annual Stockholders Meeting of the Company held on May 15, 2018, stockholders approved the Celsion Corporation 2018 Stock Incentive
Plan (the &#8220;2018 Plan&#8221;). The 2018 Plan, as adopted, permits the granting of <span id="xdx_900_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_c20210630__us-gaap--PlanNameAxis__custom--TwoThousandAndEighteenStockIncentivePlanMember_pdd"><ix:nonFraction name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized" contextRef="AsOf2021-06-30_custom_TwoThousandAndEighteenStockIncentivePlanMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">2,700,000</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">shares of Celsion common stock as equity awards
in the form of incentive stock options, nonqualified stock options, restricted stock, restricted stock units, stock appreciation rights,
other stock awards, performance awards, or in any combination of the foregoing. At the 2019 Annual Stockholders Meeting of the Company
held on May 14, 2019, stockholders approved an amendment to the 2018 Plan whereby the Company increased the number of common stock shares
available by <span id="xdx_906_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_iI_c20190514__us-gaap--PlanNameAxis__custom--TwoThousandAndEighteenStockIncentivePlanMember__srt--RangeAxis__srt--MinimumMember_zLqi5XRg0ysh"><ix:nonFraction name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant" contextRef="AsOf2019-05-14_custom_TwoThousandAndEighteenStockIncentivePlanMember_srt_MinimumMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">1,200,000</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">to a total of <span id="xdx_90E_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_iI_c20190514__us-gaap--PlanNameAxis__custom--TwoThousandAndEighteenStockIncentivePlanMember__srt--RangeAxis__srt--MaximumMember_z1yrVQy1CBnh"><ix:nonFraction name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant" contextRef="AsOf2019-05-14_custom_TwoThousandAndEighteenStockIncentivePlanMember_srt_MaximumMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">3,900,000</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">under the 2018 Plan, as amended. Prior to the
adoption of the 2018 Plan, the Company had maintained the Celsion Corporation 2007 Stock Incentive Plan (the &#8220;2007 Plan&#8221;).
At the 2020 Annual Stockholders Meeting of the Company held on June 15, 2020, stockholders approved an amendment to the 2018 Plan, as
previously amended, whereby the Company increased the number of shares of common stock available by <span id="xdx_90D_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_c20200615__us-gaap--PlanNameAxis__custom--TwoThousandAndEighteenStockIncentivePlanMember__srt--RangeAxis__srt--MinimumMember_pdd"><ix:nonFraction name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant" contextRef="AsOf2020-06-15_custom_TwoThousandAndEighteenStockIncentivePlanMember_srt_MinimumMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">2,500,000</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">to a total of <span id="xdx_90F_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_c20200615__us-gaap--PlanNameAxis__custom--TwoThousandAndEighteenStockIncentivePlanMember__srt--RangeAxis__srt--MaximumMember_pdd"><ix:nonFraction name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant" contextRef="AsOf2020-06-15_custom_TwoThousandAndEighteenStockIncentivePlanMember_srt_MaximumMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">6,400,000</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">under the 2018 Plan, as amended. At the 2021
Annual Stockholders Meeting of the Company held on June 10, 2020, stockholders approved an amendment to the 2018 Plan, as previously
amended, whereby the Company increased the number of shares of common stock available by <span id="xdx_902_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_iI_c20210610__us-gaap--PlanNameAxis__custom--TwoThousandAndEighteenStockIncentivePlanMember__srt--RangeAxis__srt--MinimumMember_zkv7ydFVwj2"><ix:nonFraction name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant" contextRef="AsOf2021-06-10_custom_TwoThousandAndEighteenStockIncentivePlanMember_srt_MinimumMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">7,700,000</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">to a total of <span id="xdx_90F_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_iI_c20210610__us-gaap--PlanNameAxis__custom--TwoThousandAndEighteenStockIncentivePlanMember__srt--RangeAxis__srt--MaximumMember_z0Zgx5xDVRQ6"><ix:nonFraction name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant" contextRef="AsOf2021-06-10_custom_TwoThousandAndEighteenStockIncentivePlanMember_srt_MaximumMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">14,100,000</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">under the 2018 Plan, as amended.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">The
Company has issued stock awards to employees and directors in the form of stock options and restricted stock. <span id="xdx_901_ecustom--StockOptionsStrikePriceDescription_c20210101__20210630__us-gaap--PlanNameAxis__custom--TwoThousandSevenStockIncentivePlanMember"><ix:nonNumeric contextRef="From2021-01-012021-06-30_custom_TwoThousandSevenStockIncentivePlanMember" name="CLSN:StockOptionsStrikePriceDescription">Options
are generally granted with strike prices equal to the fair market value of a share of Celsion common stock on the date of grant. Incentive
stock options may be granted to purchase shares of common stock at a price not less than 100% of the fair market value of the underlying
shares on the date of grant, provided that the exercise price of any incentive stock option granted to an eligible employee owning more
than 10% of the outstanding stock of Celsion must be at least 110% of such fair market value on the date of grant. Only officers and
key employees may receive incentive stock options.</ix:nonNumeric></span></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>


<ix:exclude><!-- Field: Page; Sequence: 22 -->
    <div style="border-bottom: Black 1.5pt solid; margin-bottom: 6pt"><table cellpadding="0" cellspacing="0" style="border-collapse: collapse; width: 100%; font-size: 10pt"><tr style="vertical-align: top; text-align: left"><td style="text-align: center; width: 100%"><!-- Field: Sequence; Type: Arabic; Name: PageNo -->19<!-- Field: /Sequence --></td></tr></table></div>
    <div style="break-before: page; margin-top: 6pt"><table cellpadding="0" cellspacing="0" style="border-collapse: collapse; width: 100%; font-size: 10pt"><tr style="vertical-align: top; text-align: left"><td style="text-align: center; width: 100%">&#160;</td></tr></table></div>
    <!-- Field: /Page --></ix:exclude>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Option
and restricted stock awards vest upon terms determined by the Compensation Committee of the Board of Directors and are subject to accelerated
vesting in the event of a change of control or certain terminations of employment. The Company issues new shares to satisfy its obligations
from the exercise of options or the grant of restricted stock awards.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">On
September 28, 2018, and again on February 19, 2019, the Compensation Committee of the Board of Directors approved the grant of (i)
inducement stock options (the &#8220;Inducement Option Grants&#8221;) to purchase a total of <span id="xdx_90C_eus-gaap--SharesIssued_c20180928__us-gaap--PlanNameAxis__custom--InducementOptionGrantsMember__srt--TitleOfIndividualAxis__custom--FiveNewEmployeesMember__us-gaap--StatementEquityComponentsAxis__us-gaap--CommonStockMember_pdd"><ix:nonFraction name="us-gaap:SharesIssued" contextRef="AsOf2018-09-28_custom_InducementOptionGrantsMember_custom_FiveNewEmployeesMember_us-gaap_CommonStockMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">164,004</ix:nonFraction> </span></span><span style="font: 10pt Times New Roman, Times, Serif">and <span id="xdx_907_eus-gaap--SharesIssued_c20190219__us-gaap--PlanNameAxis__custom--InducementOptionGrantsMember__srt--TitleOfIndividualAxis__custom--FiveNewEmployeesMember__us-gaap--StatementEquityComponentsAxis__us-gaap--CommonStockMember_pdd"><ix:nonFraction name="us-gaap:SharesIssued" contextRef="AsOf2019-02-19_custom_InducementOptionGrantsMember_custom_FiveNewEmployeesMember_us-gaap_CommonStockMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">140,004</ix:nonFraction> </span></span><span style="font: 10pt Times New Roman, Times, Serif">shares
of Celsion common stock, respectively and (ii) inducement restricted stock awards (the &#8220;Inducement Stock Grants&#8221;)
totaling <span id="xdx_90D_eus-gaap--SharesIssued_c20180928__us-gaap--PlanNameAxis__custom--InducementOptionGrantsMember__srt--TitleOfIndividualAxis__custom--FiveNewEmployeesMember__us-gaap--AwardTypeAxis__us-gaap--RestrictedStockMember_pdd"><ix:nonFraction name="us-gaap:SharesIssued" contextRef="AsOf2018-09-28_custom_InducementOptionGrantsMember_custom_FiveNewEmployeesMember_us-gaap_RestrictedStockMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">19,000</ix:nonFraction> </span></span><span style="font: 10pt Times New Roman, Times, Serif">and <span id="xdx_906_eus-gaap--SharesIssued_c20190219__us-gaap--PlanNameAxis__custom--InducementOptionGrantsMember__srt--TitleOfIndividualAxis__custom--FiveNewEmployeesMember__us-gaap--AwardTypeAxis__us-gaap--RestrictedStockMember_pdd"><ix:nonFraction name="us-gaap:SharesIssued" contextRef="AsOf2019-02-19_custom_InducementOptionGrantsMember_custom_FiveNewEmployeesMember_us-gaap_RestrictedStockMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">13,000</ix:nonFraction> </span></span><span style="font: 10pt Times New Roman, Times, Serif">shares
of Celsion common stock to five new employees collectively. Each award has a grant date of the date of grant. Each Inducement Option
Grant has an exercise price per share equal to $<span id="xdx_908_eus-gaap--ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_c20180927__20180928__us-gaap--PlanNameAxis__custom--InducementOptionGrantsMember__srt--TitleOfIndividualAxis__custom--FiveNewEmployeesMember_pdd"><ix:nonFraction name="us-gaap:ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice" contextRef="From2018-09-272018-09-28_custom_InducementOptionGrantsMember_custom_FiveNewEmployeesMember" format="ixt:numdotdecimal" decimals="INF" unitRef="USDPShares">2.77</ix:nonFraction> </span></span><span style="font: 10pt Times New Roman, Times, Serif">and
$<span id="xdx_907_eus-gaap--ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_c20190218__20190219__us-gaap--PlanNameAxis__custom--InducementOptionGrantsMember__srt--TitleOfIndividualAxis__custom--FiveNewEmployeesMember_pdd"><ix:nonFraction name="us-gaap:ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice" contextRef="From2019-02-182019-02-19_custom_InducementOptionGrantsMember_custom_FiveNewEmployeesMember" format="ixt:numdotdecimal" decimals="INF" unitRef="USDPShares">2.18</ix:nonFraction> </span></span><span style="font: 10pt Times New Roman, Times, Serif">which
represents the closing price of Celsion&#8217;s common stock as reported by Nasdaq on September 28, 2018 and February 19, 2019,
respectively. Each Inducement Option Grant will vest over <span id="xdx_901_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_dc_c20190218__20190219__us-gaap--PlanNameAxis__custom--InducementOptionGrantsMember__srt--TitleOfIndividualAxis__custom--FiveNewEmployeesMember_zg6B4KigMCR1"><ix:nonNumeric contextRef="From2019-02-182019-02-19_custom_InducementOptionGrantsMember_custom_FiveNewEmployeesMember" format="ixt-sec:durwordsen" name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1">three years</ix:nonNumeric></span>, with one-third vesting on the one-year anniversary of the
employee&#8217;s first day of employment with the Company and one-third vesting on the second and third anniversaries thereafter,
subject to the new employee&#8217;s continued service relationship with the Company on each such date. Each Inducement Option Grant
has a ten-year term and is subject to the terms and conditions of the applicable stock option agreement. Each of Inducement Stock
Grant vested on the one-year anniversary of the employee&#8217;s first day of employment with the Company is subject to the new
employee&#8217;s continued service relationship with the Company through such date and is subject to the terms and conditions of the
applicable restricted stock agreement.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">As
of June 30, 2021, there were a total of <span id="xdx_907_eus-gaap--CommonStockCapitalSharesReservedForFutureIssuance_c20210630__us-gaap--PlanNameAxis__custom--TwoThousandAndEighteenStockIncentivePlanMember_pdd"><ix:nonFraction name="us-gaap:CommonStockCapitalSharesReservedForFutureIssuance" contextRef="AsOf2021-06-30_custom_TwoThousandAndEighteenStockIncentivePlanMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">14,198,424</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">shares of Celsion common stock reserved for
issuance under the 2018 Plan, which were comprised of <span id="xdx_909_eus-gaap--CommonStockCapitalSharesReservedForFutureIssuance_c20210630__us-gaap--AwardTypeAxis__custom--EquityStockAwardsMember__srt--StatementScenarioAxis__custom--GrantedUnderTwoThousandEighteenPlanAndTwoThousandSevenPlanMember_pdd"><ix:nonFraction name="us-gaap:CommonStockCapitalSharesReservedForFutureIssuance" contextRef="AsOf2021-06-30_custom_EquityStockAwardsMember_custom_GrantedUnderTwoThousandEighteenPlanAndTwoThousandSevenPlanMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">6,548,325</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">shares of Celsion common stock subject to equity
awards previously granted under the 2018 Plan and 2007 Plan and <span id="xdx_90E_eus-gaap--CommonStockCapitalSharesReservedForFutureIssuance_iI_c20210630__us-gaap--PlanNameAxis__custom--TwoThousandAndEighteenPlanMember_z956AaBaeSe6"><ix:nonFraction name="us-gaap:CommonStockCapitalSharesReservedForFutureIssuance" contextRef="AsOf2021-06-30_custom_TwoThousandAndEighteenPlanMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">7,650,099</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">shares of Celsion common stock available for
future issuance under the 2018 Plan. As of June 30, 2021, there were a total of <span id="xdx_90D_eus-gaap--CommonStockCapitalSharesReservedForFutureIssuance_iI_c20210630__us-gaap--AwardTypeAxis__custom--InducementAwardsMember_zxqedVkaaaz3"><ix:nonFraction name="us-gaap:CommonStockCapitalSharesReservedForFutureIssuance" contextRef="AsOf2021-06-30_custom_InducementAwardsMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">140,004</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">shares of Celsion common stock subject to outstanding
inducement awards.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Total
compensation cost related to stock options and restricted stock awards amounted to $<span id="xdx_90D_eus-gaap--AllocatedShareBasedCompensationExpense_pp0p0_c20210401__20210630__us-gaap--AwardTypeAxis__custom--EmployeeStockOptionAndRestrictedStockAwardsMember_zOmXtm9Xb4T7"><ix:nonFraction name="us-gaap:AllocatedShareBasedCompensationExpense" contextRef="From2021-04-012021-06-30_custom_EmployeeStockOptionAndRestrictedStockAwardsMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">793,619</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">and $<span id="xdx_906_eus-gaap--AllocatedShareBasedCompensationExpense_pp0p0_c20200401__20200630__us-gaap--AwardTypeAxis__custom--EmployeeStockOptionAndRestrictedStockAwardsMember_zmb9KxLh1xzg"><ix:nonFraction name="us-gaap:AllocatedShareBasedCompensationExpense" contextRef="From2020-04-012020-06-30_custom_EmployeeStockOptionAndRestrictedStockAwardsMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">578,761</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">for the three-month periods ended June 30, 2021
and 2020, respectively. Of these amounts, $<span id="xdx_902_eus-gaap--AllocatedShareBasedCompensationExpense_pp0p0_c20210401__20210630__us-gaap--AwardTypeAxis__custom--EmployeeStockOptionAndRestrictedStockAwardsMember__us-gaap--IncomeStatementLocationAxis__us-gaap--ResearchAndDevelopmentExpenseMember_zvAXbhtQ8ii9"><ix:nonFraction name="us-gaap:AllocatedShareBasedCompensationExpense" contextRef="From2021-04-012021-06-30_custom_EmployeeStockOptionAndRestrictedStockAwardsMember_us-gaap_ResearchAndDevelopmentExpenseMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">299,581</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">and $<span id="xdx_90B_eus-gaap--AllocatedShareBasedCompensationExpense_pp0p0_c20200401__20200630__us-gaap--AwardTypeAxis__custom--EmployeeStockOptionAndRestrictedStockAwardsMember__us-gaap--IncomeStatementLocationAxis__us-gaap--ResearchAndDevelopmentExpenseMember_zo7odFA6jb2j"><ix:nonFraction name="us-gaap:AllocatedShareBasedCompensationExpense" contextRef="From2020-04-012020-06-30_custom_EmployeeStockOptionAndRestrictedStockAwardsMember_us-gaap_ResearchAndDevelopmentExpenseMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">200,186</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">was charged to research and development during
the three-month periods ended June 30, 2021 and 2020, respectively, and $<span id="xdx_908_eus-gaap--AllocatedShareBasedCompensationExpense_pp0p0_c20210401__20210630__us-gaap--AwardTypeAxis__custom--EmployeeStockOptionAndRestrictedStockAwardsMember__us-gaap--IncomeStatementLocationAxis__us-gaap--GeneralAndAdministrativeExpenseMember_zsTEVS685Fp7"><ix:nonFraction name="us-gaap:AllocatedShareBasedCompensationExpense" contextRef="From2021-04-012021-06-30_custom_EmployeeStockOptionAndRestrictedStockAwardsMember_us-gaap_GeneralAndAdministrativeExpenseMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">494,038</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">and $<span id="xdx_908_eus-gaap--AllocatedShareBasedCompensationExpense_pp0p0_c20200401__20200630__us-gaap--AwardTypeAxis__custom--EmployeeStockOptionAndRestrictedStockAwardsMember__us-gaap--IncomeStatementLocationAxis__us-gaap--GeneralAndAdministrativeExpenseMember_z0BVdkASGh58"><ix:nonFraction name="us-gaap:AllocatedShareBasedCompensationExpense" contextRef="From2020-04-012020-06-30_custom_EmployeeStockOptionAndRestrictedStockAwardsMember_us-gaap_GeneralAndAdministrativeExpenseMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">378,575</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">was charged to general and administrative expenses
during the three-month periods ended June 30, 2021 and 2020, respectively.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Total
compensation cost related to stock options and restricted stock awards amounted to $<span id="xdx_90B_eus-gaap--AllocatedShareBasedCompensationExpense_c20210101__20210630__us-gaap--AwardTypeAxis__custom--EmployeeStockOptionAndRestrictedStockAwardsMember_pp0p0"><ix:nonFraction name="us-gaap:AllocatedShareBasedCompensationExpense" contextRef="From2021-01-012021-06-30_custom_EmployeeStockOptionAndRestrictedStockAwardsMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">2,372,945</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">and $<span id="xdx_909_eus-gaap--AllocatedShareBasedCompensationExpense_c20200101__20200630__us-gaap--AwardTypeAxis__custom--EmployeeStockOptionAndRestrictedStockAwardsMember_pp0p0"><ix:nonFraction name="us-gaap:AllocatedShareBasedCompensationExpense" contextRef="From2020-01-012020-06-30_custom_EmployeeStockOptionAndRestrictedStockAwardsMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">1,030,726</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">for the six-month periods ended June 30, 2021
and 2020, respectively. Of these amounts, $<span id="xdx_904_eus-gaap--AllocatedShareBasedCompensationExpense_c20210101__20210630__us-gaap--AwardTypeAxis__custom--EmployeeStockOptionAndRestrictedStockAwardsMember__us-gaap--IncomeStatementLocationAxis__us-gaap--ResearchAndDevelopmentExpenseMember_pp0p0"><ix:nonFraction name="us-gaap:AllocatedShareBasedCompensationExpense" contextRef="From2021-01-012021-06-30_custom_EmployeeStockOptionAndRestrictedStockAwardsMember_us-gaap_ResearchAndDevelopmentExpenseMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">882,088</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">and $<span id="xdx_90B_eus-gaap--AllocatedShareBasedCompensationExpense_c20200101__20200630__us-gaap--AwardTypeAxis__custom--EmployeeStockOptionAndRestrictedStockAwardsMember__us-gaap--IncomeStatementLocationAxis__us-gaap--ResearchAndDevelopmentExpenseMember_pp0p0"><ix:nonFraction name="us-gaap:AllocatedShareBasedCompensationExpense" contextRef="From2020-01-012020-06-30_custom_EmployeeStockOptionAndRestrictedStockAwardsMember_us-gaap_ResearchAndDevelopmentExpenseMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">378,122</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">was charged to research and development during
the six-month periods ended June 30, 2021 and 2020, respectively, and $<span id="xdx_900_eus-gaap--AllocatedShareBasedCompensationExpense_c20210101__20210630__us-gaap--AwardTypeAxis__custom--EmployeeStockOptionAndRestrictedStockAwardsMember__us-gaap--IncomeStatementLocationAxis__us-gaap--GeneralAndAdministrativeExpenseMember_pp0p0"><ix:nonFraction name="us-gaap:AllocatedShareBasedCompensationExpense" contextRef="From2021-01-012021-06-30_custom_EmployeeStockOptionAndRestrictedStockAwardsMember_us-gaap_GeneralAndAdministrativeExpenseMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">1,490,857</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">and $<span id="xdx_902_eus-gaap--AllocatedShareBasedCompensationExpense_c20200101__20200630__us-gaap--AwardTypeAxis__custom--EmployeeStockOptionAndRestrictedStockAwardsMember__us-gaap--IncomeStatementLocationAxis__us-gaap--GeneralAndAdministrativeExpenseMember_pp0p0"><ix:nonFraction name="us-gaap:AllocatedShareBasedCompensationExpense" contextRef="From2020-01-012020-06-30_custom_EmployeeStockOptionAndRestrictedStockAwardsMember_us-gaap_GeneralAndAdministrativeExpenseMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">652,604</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">was charged to general and administrative expenses
during the six-month periods ended June 30, 2021 and 2020, respectively.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">As
of June 30, 2021, there was $<span id="xdx_903_eus-gaap--EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_iI_pn5n6_c20210630_zNzij1mXPAQe"><ix:nonFraction name="us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized" contextRef="AsOf2021-06-30" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">3.2</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million of total unrecognized compensation cost
related to non-vested stock-based compensation arrangements. That cost is expected to be recognized over a weighted-average period of
<span id="xdx_906_eus-gaap--EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_dtY_c20210101__20210630_zE9oLHUCHx4d"><ix:nonNumeric contextRef="From2021-01-01to2021-06-30" format="ixt-sec:duryear" name="us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1">1.2</ix:nonNumeric>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">years. The weighted average grant date fair values
of the stock options granted was $<span id="xdx_907_eus-gaap--ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_c20210101__20210630_pdd"><ix:nonFraction name="us-gaap:ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice" contextRef="From2021-01-01to2021-06-30" format="ixt:numdotdecimal" decimals="INF" unitRef="USDPShares">1.98</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">and $<span id="xdx_90A_eus-gaap--ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_c20200101__20200630_pdd"><ix:nonFraction name="us-gaap:ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice" contextRef="From2020-01-012020-06-30" format="ixt:numdotdecimal" decimals="INF" unitRef="USDPShares">3.10</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">during the six-month periods ended June 30, 2021
and 2020, respectively. A summary of stock option awards and restricted stock grants for the three-months ended June 30, 2021 is presented
below:</span></p>

<ix:nonNumeric contextRef="From2021-01-01to2021-06-30" escape="true" name="CLSN:SummaryOfStockOptionAndRestrictedStockAwardsTableTextBlock"><p id="xdx_897_ecustom--SummaryOfStockOptionAndRestrictedStockAwardsTableTextBlock_zdNvlcpS5MWa" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span id="xdx_8B5_zdwapitkW4Tb" style="font: 10pt Times New Roman, Times, Serif; display: none">Summary
of Stock Option Awards and Restricted Stock Grants</span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="vertical-align: bottom">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="6" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">Stock
    Options</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="6" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">Restricted
    Stock Awards</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>Weighted</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>Average</b></span></p></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>Options</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>Outstanding</b></span></p></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>Weighted</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>Average</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>Exercise</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>Price</b></span></p></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>Non-vested</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>Restricted</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>Stock</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>Outstanding</b></span></p></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>Weighted</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>Average</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>Grant</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>Date</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>Fair
                                            Value</b></span></p></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>Contractual</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>Terms
                                            of</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>Equity</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>Awards</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>(in
                                            years)</b></span></p></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="width: 35%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">Equity awards outstanding at January
    1, 2021</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_987_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_iS_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zs8NivCzWEJl" title="Number Outstanding, Outstanding, Beginning balance" style="width: 9%; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber" contextRef="AsOf2020-12-31_us-gaap_EmployeeStockOptionMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">4,624,725</ix:nonFraction></span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_98E_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_iS_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zjNzVF9yzIq2" title="Weighted Average Exercise Price, Outstanding, Beginning balance" style="width: 9%; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice" contextRef="AsOf2020-12-31_us-gaap_EmployeeStockOptionMember" format="ixt:numdotdecimal" decimals="INF" unitRef="USDPShares">2.77</ix:nonFraction></span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_984_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_iS_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--RestrictedStockMember_zqUlMKUubbcj" title="Number Outstanding, Non-vested stock awards, Outstanding, Beginning balance" style="width: 9%; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" contextRef="AsOf2020-12-31_us-gaap_RestrictedStockMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">2,750</ix:nonFraction></span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_987_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_iS_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--RestrictedStockMember_z740gWcrLMA3" title="Weighted Average Grant Date Fair Value, Non-vested stock awards, Outstanding, Beginning balance" style="width: 9%; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue" contextRef="AsOf2020-12-31_us-gaap_RestrictedStockMember" format="ixt:numdotdecimal" decimals="INF" unitRef="USDPShares">0.89</ix:nonFraction></span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="width: 9%; text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">Equity awards granted</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_986_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_pdd" title="Number Outstanding, Options granted" style="text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod" contextRef="From2021-01-012021-06-30_us-gaap_EmployeeStockOptionMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">2,154,000</ix:nonFraction></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_986_eus-gaap--ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_pdd" title="Weighted Average Exercise Price, Options granted" style="text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice" contextRef="From2021-01-012021-06-30_us-gaap_EmployeeStockOptionMember" format="ixt:numdotdecimal" decimals="INF" unitRef="USDPShares">2.18</ix:nonFraction></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_987_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--RestrictedStockMember_pdd" title="Number Outstanding, Non-vested stock awards, Granted" style="text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" contextRef="From2021-01-012021-06-30_us-gaap_RestrictedStockMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">7,000</ix:nonFraction></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_98E_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--RestrictedStockMember_pdd" title="Weighted Average Grant Date Fair Value, Non-vested stock awards, Granted" style="text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" contextRef="From2021-01-012021-06-30_us-gaap_RestrictedStockMember" format="ixt:numdotdecimal" decimals="INF" unitRef="USDPShares">1.38</ix:nonFraction></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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  <tr style="vertical-align: bottom; background-color: White">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">Equity awards exercised or vested and issued</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_984_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--RestrictedStockMember_pdd" title="Number Outstanding, Non-vested stock awards, exercised or vested and issued" style="text-align: right"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl1157">-</span></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">Equity awards forfeited,
    cancelled or expired</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_98B_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--RestrictedStockMember_pdd" title="Number Outstanding, Non-vested stock awards, Forfeited" style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl1165">-</span></span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_98E_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--RestrictedStockMember_pdd" title="Weighted Average Grant Date Fair Value, Non-vested stock awards, Forfeited" style="padding-bottom: 1.5pt; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl1167">-</span></span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt; text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left; padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">Equity awards outstanding
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    <td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_98F_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_iE_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zoAmbc7LD97b" title="Weighted Average Exercise Price, Outstanding, Ending balance" style="padding-bottom: 2.5pt; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice" contextRef="AsOf2021-06-30_us-gaap_EmployeeStockOptionMember" format="ixt:numdotdecimal" decimals="INF" unitRef="USDPShares">2.58</ix:nonFraction></span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_98F_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_iE_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--RestrictedStockMember_z2MhcObQKuDf" title="Number Outstanding, Non-vested stock awards, Outstanding, Ending balance" style="border-bottom: Black 2.5pt double; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" contextRef="AsOf2021-06-30_us-gaap_RestrictedStockMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">9,750</ix:nonFraction></span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_985_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_iE_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--RestrictedStockMember_zkzFCAGm1tvg" title="Weighted Average Grant Date Fair Value, Non-vested stock awards, Outstanding, Ending balance" style="padding-bottom: 2.5pt; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue" contextRef="AsOf2021-06-30_us-gaap_RestrictedStockMember" format="ixt:numdotdecimal" decimals="INF" unitRef="USDPShares">1.27</ix:nonFraction></span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt; text-align: right"><span id="xdx_905_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_dtY_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zbBH4fvhOS5i" style="font-family: Times New Roman, Times, Serif"><ix:nonNumeric contextRef="From2021-01-012021-06-30_us-gaap_EmployeeStockOptionMember" format="ixt-sec:duryear" name="us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2">8.0</ix:nonNumeric></span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left; padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">Aggregate intrinsic
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    <td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt; text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
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    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left; padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">Aggregate intrinsic
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    <td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt; text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt; text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt; text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt; text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  </table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></p>

</ix:nonNumeric><p id="xdx_8A1_z5CbKCmiKN2l" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>


<ix:exclude><!-- Field: Page; Sequence: 23 -->
    <div style="border-bottom: Black 1.5pt solid; margin-bottom: 6pt"><table cellpadding="0" cellspacing="0" style="border-collapse: collapse; width: 100%; font-size: 10pt"><tr style="vertical-align: top; text-align: left"><td style="text-align: center; width: 100%"><!-- Field: Sequence; Type: Arabic; Name: PageNo -->20<!-- Field: /Sequence --></td></tr></table></div>
    <div style="break-before: page; margin-top: 6pt"><table cellpadding="0" cellspacing="0" style="border-collapse: collapse; width: 100%; font-size: 10pt"><tr style="vertical-align: top; text-align: left"><td style="text-align: center; width: 100%">&#160;</td></tr></table></div>
    <!-- Field: /Page --></ix:exclude>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<ix:nonNumeric contextRef="From2021-01-01to2021-06-30" escape="true" name="us-gaap:ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock"><p id="xdx_89C_eus-gaap--ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock_zvVrpPRBlNSd" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">The
fair values of stock options granted were estimated at the date of grant using the Black-Scholes option pricing model. The Black-Scholes
model was originally developed for use in estimating the fair value of traded options, which have different characteristics from Celsion&#8217;s
stock options. The model is also sensitive to changes in assumptions, which can materially affect the fair value estimate. The Company
used the following assumptions for determining the fair value of options granted under the Black-Scholes option pricing model:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;<span id="xdx_8B1_zAvmRlNBERij" style="display: none">Schedule
of Assumptions Used to Determine Fair Value of Options Granted</span></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1.5pt"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif; padding-bottom: 1.5pt"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: bold 10pt Times New Roman, Times, Serif; padding-bottom: 1.5pt; text-align: left"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td><td colspan="5" style="border-bottom: Black 1.5pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>Six
                                            Months Ended June 30, &#160;</b></span></td><td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1.5pt; text-align: left"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1.5pt"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif; padding-bottom: 1.5pt"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: bold 10pt Times New Roman, Times, Serif; padding-bottom: 1.5pt; text-align: left"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 1.5pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">2021</span></td><td style="font: bold 10pt Times New Roman, Times, Serif; padding-bottom: 1.5pt; text-align: left"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif; padding-bottom: 1.5pt"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: bold 10pt Times New Roman, Times, Serif; padding-bottom: 1.5pt; text-align: left"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 1.5pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">2020</span></td><td style="font: bold 10pt Times New Roman, Times, Serif; padding-bottom: 1.5pt; text-align: left"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; width: 60%; text-align: left"><span style="font: 10pt Times New Roman, Times, Serif">Risk-free
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    <td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 16%; text-align: right"><span id="xdx_90C_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum_pid_dp_c20210101__20210630_zbHSZSVsxGng" style="font: 10pt Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum" contextRef="From2021-01-01to2021-06-30" format="ixt:numdotdecimal" decimals="INF" scale="-2" unitRef="Percentage">1.56</ix:nonFraction>
                                            </span><span style="font: 10pt Times New Roman, Times, Serif">to <span id="xdx_90C_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum_pid_dp_c20210101__20210630_z61dC6LUBpG7"><ix:nonFraction name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum" contextRef="From2021-01-01to2021-06-30" format="ixt:numdotdecimal" decimals="INF" scale="-2" unitRef="Percentage">1.74</ix:nonFraction></span></span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font: 10pt Times New Roman, Times, Serif">%</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 2%"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 16%; text-align: right"><span id="xdx_90D_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum_pid_dp_c20200101__20200630_zsBDu6znfba7" style="font: 10pt Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum" contextRef="From2020-01-012020-06-30" format="ixt:numdotdecimal" decimals="INF" scale="-2" unitRef="Percentage">0.71</ix:nonFraction>
                                            </span><span style="font: 10pt Times New Roman, Times, Serif">to <span id="xdx_903_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum_pid_dp_c20200101__20200630_z4h3tRgTmWW3"><ix:nonFraction name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum" contextRef="From2020-01-012020-06-30" format="ixt:numdotdecimal" decimals="INF" scale="-2" unitRef="Percentage">1.33</ix:nonFraction></span></span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">%</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font: 10pt Times New Roman, Times, Serif">Expected
    volatility</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span id="xdx_908_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum_pid_dp_c20210101__20210630_zOviDMd7lCtf" style="font: 10pt Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum" contextRef="From2021-01-01to2021-06-30" format="ixt:numdotdecimal" decimals="INF" scale="-2" unitRef="Percentage">106.8</ix:nonFraction>
                                            </span><span style="font: 10pt Times New Roman, Times, Serif">to <span id="xdx_904_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum_pid_dp_c20210101__20210630_zY4Mod2WgDI"><ix:nonFraction name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum" contextRef="From2021-01-01to2021-06-30" format="ixt:numdotdecimal" decimals="INF" scale="-2" unitRef="Percentage">113.0</ix:nonFraction></span></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif">%</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span id="xdx_901_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum_pid_dp_c20200101__20200630_zNHIZ28tcg1d" style="font: 10pt Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum" contextRef="From2020-01-012020-06-30" format="ixt:numdotdecimal" decimals="INF" scale="-2" unitRef="Percentage">100.4</ix:nonFraction>
                                            </span><span style="font: 10pt Times New Roman, Times, Serif">to <span id="xdx_904_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum_pid_dp_c20200101__20200630_zmTjM8Vk6KF7"><ix:nonFraction name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum" contextRef="From2020-01-012020-06-30" format="ixt:numdotdecimal" decimals="INF" scale="-2" unitRef="Percentage">104.2</ix:nonFraction></span></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font: 10pt Times New Roman, Times, Serif">%</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font: 10pt Times New Roman, Times, Serif">Expected
    life (in years)</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span id="xdx_90D_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_dtY_c20210101__20210630__srt--RangeAxis__srt--MinimumMember_zUnxBpAcWXsk" style="font: 10pt Times New Roman, Times, Serif"><ix:nonNumeric contextRef="From2021-01-012021-06-30_srt_MinimumMember" format="ixt-sec:duryear" name="us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1">7.5</ix:nonNumeric>
                                            </span><span style="font: 10pt Times New Roman, Times, Serif">to <span id="xdx_904_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_dtY_c20210101__20210630__srt--RangeAxis__srt--MaximumMember_ziitPTyChS7f"><ix:nonNumeric contextRef="From2021-01-012021-06-30_srt_MaximumMember" format="ixt-sec:duryear" name="us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1">10.0</ix:nonNumeric></span></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font: 10pt Times New Roman, Times, Serif">&#160;<span id="xdx_903_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_dtY_c20200101__20200630__srt--RangeAxis__srt--MinimumMember_z68gZQbmans4"><ix:nonNumeric contextRef="From2020-01-012020-06-30_srt_MinimumMember" format="ixt-sec:duryear" name="us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1">8.5</ix:nonNumeric>
                                            </span></span><span style="font: 10pt Times New Roman, Times, Serif">to
                                            <span id="xdx_901_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_dtY_c20200101__20200630__srt--RangeAxis__srt--MaximumMember_zW5npx7wLpgg"><ix:nonNumeric contextRef="From2020-01-012020-06-30_srt_MaximumMember" format="ixt-sec:duryear" name="us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1">10.0</ix:nonNumeric></span></span><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font: 10pt Times New Roman, Times, Serif">Expected
    dividend yield</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_98F_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_pid_dpxL_c20210101__20210630_zIH0kzCyLy2g" title="Expected dividend yield::XDX::0" style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font: 10pt Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl1203">-</span></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font: 10pt Times New Roman, Times, Serif">%</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_981_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_pid_dpxL_c20200101__20200630_zv50SIQiZlGk" title="Expected dividend yield::XDX::0" style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font: 10pt Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl1205">-</span></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font: 10pt Times New Roman, Times, Serif">%</span></td></tr>
  </table>

</ix:nonNumeric><p id="xdx_8A3_z2lHzkFiftZ1" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Expected
volatilities utilized in the model are based on historical volatility of the Company&#8217;s stock price. The risk-free interest rate
is derived from values assigned to U.S. Treasury bonds with terms that approximate the expected option lives in effect at the time of
grant.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

</ix:nonNumeric><ix:nonNumeric contextRef="From2021-01-01to2021-06-30" escape="true" name="CLSN:EarnoutMilestoneLiabilityDisclosureTextBlock"><p id="xdx_801_ecustom--EarnoutMilestoneLiabilityDisclosureTextBlock_zWkAYpPd0my2" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><b>Note
14. <span id="xdx_820_zevo1lJWXTn">Earn-Out Milestone Liability</span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">On
March 28, 2019, the Company and EGWU, Inc, entered into an amendment to its purchase agreement (&#8220;Amended Asset Purchase Agreement&#8221;),
whereby payment of the earnout milestone liability related to the Ovarian Cancer Indication of $<span id="xdx_90F_ecustom--EarnoutMilestoneLiability1_iI_pn5n6_c20190328__us-gaap--TypeOfArrangementAxis__custom--AmendedAssetPurchaseAgreementMember__us-gaap--RelatedPartyTransactionAxis__custom--AchievingMilestoneWithInOneYearMember_zKFdi26YYdQf"><ix:nonFraction name="CLSN:EarnoutMilestoneLiability1" contextRef="AsOf2019-03-28_custom_AmendedAssetPurchaseAgreementMember_custom_AchievingMilestoneWithInOneYearMember" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">12.4</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million had been modified. The Company has the
option to make the payment as follows:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<table cellspacing="0" cellpadding="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">a)</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">$<span id="xdx_903_ecustom--EarnoutMilestoneLiability1_iI_pn5n6_c20190328__us-gaap--TypeOfArrangementAxis__custom--AmendedAssetPurchaseAgreementMember__us-gaap--RelatedPartyTransactionAxis__custom--CertainBusinessDaysOfAchievingMilestoneMember_zsLTm1kmMUok"><ix:nonFraction name="CLSN:EarnoutMilestoneLiability1" contextRef="AsOf2019-03-28_custom_AmendedAssetPurchaseAgreementMember_custom_CertainBusinessDaysOfAchievingMilestoneMember" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">7.0</ix:nonFraction>
    </span></span><span style="font: 10pt Times New Roman, Times, Serif">million in cash within 10 business days of
    achieving the milestone; or</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">b)</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">$<span id="xdx_901_ecustom--EarnoutMilestoneLiability1_iI_pn5n6_c20190328__us-gaap--TypeOfArrangementAxis__custom--AmendedAssetPurchaseAgreementMember_zWYkwwuaJn8d"><ix:nonFraction name="CLSN:EarnoutMilestoneLiability1" contextRef="AsOf2019-03-28_custom_AmendedAssetPurchaseAgreementMember" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">12.4</ix:nonFraction>
    </span></span><span style="font: 10pt Times New Roman, Times, Serif">million in cash, common stock of the Company,
    or a combination of either, within one year of achieving the milestone.</span></td></tr>
  </table>
<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">As
of June 30, 2021, March 31, 2021, and December 31, 2020, the Company fair valued the earn-out milestone liability at $<span id="xdx_907_eus-gaap--BusinessCombinationConsiderationTransferredLiabilitiesIncurred_pn5n6_c20210101__20210630__us-gaap--BusinessAcquisitionAxis__custom--EGWCMember__us-gaap--TypeOfArrangementAxis__custom--FairValueEarnoutMilestoneLiabilityMember_zjvRVWZhGx1c"><ix:nonFraction name="us-gaap:BusinessCombinationConsiderationTransferredLiabilitiesIncurred" contextRef="From2021-01-012021-06-30_custom_EGWCMember_custom_FairValueEarnoutMilestoneLiabilityMember" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">7.1</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million, $<span id="xdx_909_eus-gaap--BusinessCombinationConsiderationTransferredLiabilitiesIncurred_pn5n6_c20210101__20210331__us-gaap--BusinessAcquisitionAxis__custom--EGWCMember__us-gaap--TypeOfArrangementAxis__custom--FairValueEarnoutMilestoneLiabilityMember_z6g6Qd6I8Dqc"><ix:nonFraction name="us-gaap:BusinessCombinationConsiderationTransferredLiabilitiesIncurred" contextRef="From2021-01-012021-03-31_custom_EGWCMember_custom_FairValueEarnoutMilestoneLiabilityMember" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">7.2</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million and $<span id="xdx_906_eus-gaap--BusinessCombinationConsiderationTransferredLiabilitiesIncurred_pn5n6_c20200101__20201231__us-gaap--BusinessAcquisitionAxis__custom--EGWCMember__us-gaap--TypeOfArrangementAxis__custom--FairValueEarnoutMilestoneLiabilityMember_zfxlEFu7gUWe"><ix:nonFraction name="us-gaap:BusinessCombinationConsiderationTransferredLiabilitiesIncurred" contextRef="From2020-01-012020-12-31_custom_EGWCMember_custom_FairValueEarnoutMilestoneLiabilityMember" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">7.0</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million, respectively, and recognized a non-cash
benefit of $<span id="xdx_900_ecustom--NoncashChargeOnEarnoutMilestoneLiability_pn5n6_c20210401__20210630__us-gaap--BusinessAcquisitionAxis__custom--EGWCMember_zkTm03nK4Z6c"><ix:nonFraction name="CLSN:NoncashChargeOnEarnoutMilestoneLiability" contextRef="From2021-04-012021-06-30_custom_EGWCMember" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">0.1</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million for the three-months ended June 30, 2021
and a non-cash charge of $<span id="xdx_909_ecustom--NoncashChargeOnEarnoutMilestoneLiability_pn5n6_c20210101__20210630__us-gaap--BusinessAcquisitionAxis__custom--EGWCMember_zMn6JPDjG6Ea"><ix:nonFraction name="CLSN:NoncashChargeOnEarnoutMilestoneLiability" contextRef="From2021-01-012021-06-30_custom_EGWCMember" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">0.1</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million for the six-months ended June 30, 2021.
<span id="xdx_90C_ecustom--EarnoutPaymentOptionsDescription_c20210101__20210630__us-gaap--BusinessAcquisitionAxis__custom--EGWCMember"><ix:nonNumeric contextRef="From2021-01-012021-06-30_custom_EGWCMember" name="CLSN:EarnoutPaymentOptionsDescription">In
assessing the earnout milestone liability at June 30, 2021 and March 31, 2021, the Company fair valued each of the two payment options
per the Amended Asset Purchase Agreement and weighted them at 50% / 50% probability for the $7.0 million and the $12.4 million payments,
respectively.</ix:nonNumeric></span></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">As
of June 30, 2020, March 31, 2020, and December 31, 2019, the Company fair valued the earn-out milestone liability at $<span id="xdx_903_eus-gaap--BusinessCombinationConsiderationTransferredLiabilitiesIncurred_pn5n6_c20200101__20200630__us-gaap--BusinessAcquisitionAxis__custom--EGWCMember__us-gaap--TypeOfArrangementAxis__custom--FairValueEarnoutMilestoneLiabilityMember_zdUaHYWPIH78"><ix:nonFraction name="us-gaap:BusinessCombinationConsiderationTransferredLiabilitiesIncurred" contextRef="From2020-01-012020-06-30_custom_EGWCMember_custom_FairValueEarnoutMilestoneLiabilityMember" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">6.0</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million, $<span id="xdx_90F_eus-gaap--BusinessCombinationConsiderationTransferredLiabilitiesIncurred_pn5n6_c20200101__20200331__us-gaap--BusinessAcquisitionAxis__custom--EGWCMember__us-gaap--TypeOfArrangementAxis__custom--FairValueEarnoutMilestoneLiabilityMember_ziEPznTBpyw6"><ix:nonFraction name="us-gaap:BusinessCombinationConsiderationTransferredLiabilitiesIncurred" contextRef="From2020-01-012020-03-31_custom_EGWCMember_custom_FairValueEarnoutMilestoneLiabilityMember" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">5.8</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million,</span><span style="font: 10pt Times New Roman, Times, Serif">
and $<span id="xdx_907_eus-gaap--BusinessCombinationConsiderationTransferredLiabilitiesIncurred_pn5n6_c20190101__20191231__us-gaap--BusinessAcquisitionAxis__custom--EGWCMember__us-gaap--TypeOfArrangementAxis__custom--FairValueEarnoutMilestoneLiabilityMember_zsBFzoSykRF5"><ix:nonFraction name="us-gaap:BusinessCombinationConsiderationTransferredLiabilitiesIncurred" contextRef="From2019-01-012019-12-31_custom_EGWCMember_custom_FairValueEarnoutMilestoneLiabilityMember" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">5.7</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million, respectively and recognized a non-cash
charge of $<span id="xdx_905_ecustom--NoncashChargeOnEarnoutMilestoneLiability_pn5n6_c20200401__20200630__us-gaap--BusinessAcquisitionAxis__custom--EGWCMember_zHV7NOomI5m"><ix:nonFraction name="CLSN:NoncashChargeOnEarnoutMilestoneLiability" contextRef="From2020-04-012020-06-30_custom_EGWCMember" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">0.2</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">and $<span id="xdx_903_ecustom--NoncashChargeOnEarnoutMilestoneLiability_pn5n6_c20200101__20200630__us-gaap--BusinessAcquisitionAxis__custom--EGWCMember_zmg9dSrazTr3"><ix:nonFraction name="CLSN:NoncashChargeOnEarnoutMilestoneLiability" contextRef="From2020-01-012020-06-30_custom_EGWCMember" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">0.3</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million for the three-month and six-month periods
ended June 30, 2020, respectively. <span id="xdx_90A_ecustom--EarnoutPaymentOptionsDescription_c20200101__20200630__us-gaap--BusinessAcquisitionAxis__custom--EGWCMember"><ix:nonNumeric contextRef="From2020-01-012020-06-30_custom_EGWCMember" name="CLSN:EarnoutPaymentOptionsDescription">In
assessing the earnout milestone liability at June 30, 2020 and March 31, 2020, the Company fair valued each of the two payment options
per the Amended Asset Purchase Agreement and weighted them at 80% / 20% probability for the $7.0 million and the $12.4 million
payments, respectively.</ix:nonNumeric></span></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<ix:nonNumeric contextRef="From2021-01-01to2021-06-30" escape="true" name="CLSN:ScheduleOfChangesInEarnOutMilestoneLiabilitiesTableTextBlock"><p id="xdx_896_ecustom--ScheduleOfChangesInEarnOutMilestoneLiabilitiesTableTextBlock_zg2vwNiSH1K5" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">The
following is a summary of the changes in the earn-out milestone liability for the six-month period ended June 30, 2021:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;<span id="xdx_8B2_z8jvCwx4n2j5" style="display: none">Schedule
of Changes in Earn-out Milestone Liability</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="display: none; vertical-align: bottom; background-color: White">
    <td style="display: none; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="display: none"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="display: none; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="display: none; text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="display: none; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
<tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="width: 80%"><span style="font-family: Times New Roman, Times, Serif">Balance at January 1, 2021</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_981_ecustom--EarnoutMilestoneLiability_iS_pp0p0_c20210101__20210630_zfgHFwac9LC5" title="Earn-out liabilities, beginning balance" style="width: 16%; text-align: right"><span style="font-family: Times New Roman, Times, Serif">(<ix:nonFraction name="CLSN:EarnoutMilestoneLiability" contextRef="AsOf2020-12-31" format="ixt:numdotdecimal" decimals="0" scale="0" sign="-" unitRef="USD">7,018,000</ix:nonFraction></span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">)</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td style="text-align: left; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">Non-cash loss from the
    change in fair value</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">Balance at June 30, 2021</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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</ix:nonNumeric><p id="xdx_8A1_zh5NamNYDdCg" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<ix:nonNumeric contextRef="From2021-01-01to2021-06-30" escape="true" name="CLSN:ScheduleOfRiskadjustmentAssessmentTableTextBlock"><p id="xdx_898_ecustom--ScheduleOfRiskadjustmentAssessmentTableTextBlock_zO1NEdKx5kH" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">The
following is a schedule of the Company&#8217;s risk-adjustment assessment of each milestone:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;<span id="xdx_8BD_zLRJ6Thwwb7i" style="display: none">Schedule
of Risk Adjustment Assessment</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="vertical-align: bottom">
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                                            Assessment</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>of
                                            Achieving Each Milestone</b></span></p></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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    <td style="border-bottom: Black 1.5pt solid; text-align: center"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>Estimated
                                            Time</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>to
                                            Achieve</b></span></p></td></tr>
  <tr style="vertical-align: bottom">
    <td style="text-align: justify"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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    <td style="text-align: center"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="width: 44%; text-align: justify"><span style="font-family: Times New Roman, Times, Serif">June 30, 2021</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_98C_ecustom--RiskadjustmentAssessmentOfAchievingMilestone_pid_dp_c20210101__20210630_ztRZNKc1f1I" title="Risk-adjustment Assessment of achieving each Milestone" style="width: 13%; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="CLSN:RiskadjustmentAssessmentOfAchievingMilestone" contextRef="From2021-01-01to2021-06-30" format="ixt:numdotdecimal" decimals="INF" scale="-2" unitRef="Percentage">80</ix:nonFraction></span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">%</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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    <td style="width: 20%; text-align: right"><span id="xdx_90B_ecustom--EstimatedTimeToAchieveMileStone_dtY_c20210101__20210630__srt--RangeAxis__srt--MinimumMember_ztCH7vWA4Fdg" style="font-family: Times New Roman, Times, Serif"><ix:nonNumeric contextRef="From2021-01-012021-06-30_srt_MinimumMember" format="ixt-sec:duryear" name="CLSN:EstimatedTimeToAchieveMileStone">0.42</ix:nonNumeric>
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  <tr style="vertical-align: bottom; background-color: White">
    <td style="text-align: justify"><span style="font-family: Times New Roman, Times, Serif">March 31, 2021</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_98A_ecustom--RiskadjustmentAssessmentOfAchievingMilestone_pid_dp_c20210101__20210331_zY1Iv8PYEvyc" title="Risk-adjustment Assessment of achieving each Milestone" style="text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="CLSN:RiskadjustmentAssessmentOfAchievingMilestone" contextRef="From2021-01-012021-03-31" format="ixt:numdotdecimal" decimals="INF" scale="-2" unitRef="Percentage">80</ix:nonFraction></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">%</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: justify"><span style="font-family: Times New Roman, Times, Serif">December 31, 2020</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_982_ecustom--RiskadjustmentAssessmentOfAchievingMilestone_pid_dp_c20200101__20201231_zmiycbmZaiel" title="Risk-adjustment Assessment of achieving each Milestone" style="text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="CLSN:RiskadjustmentAssessmentOfAchievingMilestone" contextRef="From2020-01-012020-12-31" format="ixt:numdotdecimal" decimals="INF" scale="-2" unitRef="Percentage">80</ix:nonFraction></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">%</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_980_ecustom--DiscountRatesOnMileStoneLiabilities_pid_dp_c20200101__20201231_zuXh5ODTXFGg" title="Discount Rate" style="text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="CLSN:DiscountRatesOnMileStoneLiabilities" contextRef="From2020-01-012020-12-31" format="ixt:numdotdecimal" decimals="INF" scale="-2" unitRef="Percentage">9</ix:nonFraction></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">%</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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  <tr style="vertical-align: bottom; background-color: White">
    <td style="text-align: justify"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: justify"><span style="font-family: Times New Roman, Times, Serif">June 30, 2020</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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  <tr style="vertical-align: bottom; background-color: White">
    <td style="text-align: justify"><span style="font-family: Times New Roman, Times, Serif">March 31, 2020</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_98E_ecustom--RiskadjustmentAssessmentOfAchievingMilestone_pid_dp_c20200101__20200331_zM3RagkkzXQh" title="Risk-adjustment Assessment of achieving each Milestone" style="text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="CLSN:RiskadjustmentAssessmentOfAchievingMilestone" contextRef="From2020-01-012020-03-31" format="ixt:numdotdecimal" decimals="INF" scale="-2" unitRef="Percentage">80</ix:nonFraction></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">%</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: justify"><span style="font-family: Times New Roman, Times, Serif">December 31, 2019</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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</ix:nonNumeric><p id="xdx_8A4_zqKPVn7iWL7c" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><b>&#160;</b></span></p>


<ix:exclude><!-- Field: Page; Sequence: 24 -->
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    <!-- Field: /Page --></ix:exclude>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif"><b>&#160;</b></span></p>

</ix:nonNumeric><ix:nonNumeric contextRef="From2021-01-01to2021-06-30" escape="true" name="CLSN:WarrantsTextBlock"><p id="xdx_80F_ecustom--WarrantsTextBlock_zf8qffPJ69p5" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><b>Note
15. <span id="xdx_820_zsC0SEq00lV8">Warrants</span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<ix:nonNumeric contextRef="From2021-01-01to2021-06-30" escape="true" name="us-gaap:ScheduleOfStockholdersEquityNoteWarrantsOrRightsTextBlock"><p id="xdx_89A_eus-gaap--ScheduleOfStockholdersEquityNoteWarrantsOrRightsTextBlock_zyLOReG12MB1" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Following
is a summary of all warrant activity for the six months ended June 30, 2021:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;<span id="xdx_8B5_zuNPNjGPNfbh" style="display: none">Summary
of Warrant Activity</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="vertical-align: bottom">
    <td style="border-bottom: Black 1.5pt solid"><span style="font-family: Times New Roman, Times, Serif">Warrants</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>Number
                                            of<br /> Warrants</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>Issued</b></span></p></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>Weighted</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>Average</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>Exercise
                                            Price</b></span></p></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="width: 60%"><span style="font-family: Times New Roman, Times, Serif">Warrants outstanding at December 31, 2020</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_981_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber_iS_c20210101__20210630_zAhiFozzRZib" title="Number of Warrants Issued, Warrants outstanding, Beginning balance" style="width: 16%; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber" contextRef="AsOf2020-12-31" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">3,853,566</ix:nonFraction></span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_989_ecustom--ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingWeightedAverageExercisePrice_iS_c20210101__20210630_zqVVyHompmr8" title="Weighted Average Exercise Price, Warrants outstanding, Beginning balance" style="width: 16%; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="CLSN:ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingWeightedAverageExercisePrice" contextRef="AsOf2020-12-31" format="ixt:numdotdecimal" decimals="INF" unitRef="USDPShares">1.35</ix:nonFraction></span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">Warrants exercised during the six
    months ended June 30, 2021 (see Note 12)</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_98F_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised_iN_di_c20210101__20210630_zHPeBD6O7QY5" title="Number of Warrants Issued, Warrants exercised" style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif">(<ix:nonFraction name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised" contextRef="From2021-01-01to2021-06-30" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">1,216,667</ix:nonFraction></span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">)</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_988_ecustom--ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExerciseInPeriodWeightedAverageExercisePrice_c20210101__20210630_pdd" title="Weighted Average Exercise Price, Warrants exercised" style="padding-bottom: 1.5pt; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="CLSN:ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExerciseInPeriodWeightedAverageExercisePrice" contextRef="From2021-01-01to2021-06-30" format="ixt:numdotdecimal" decimals="INF" unitRef="USDPShares">1.24</ix:nonFraction></span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">Warrants outstanding at June 30,
    2021</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_98A_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber_iE_c20210101__20210630_zBZnYIt9d2i2" title="Number of Warrants Issued, Warrants outstanding, Ending balance" style="border-bottom: Black 2.5pt double; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber" contextRef="AsOf2021-06-30" format="ixt:numdotdecimal" decimals="INF" unitRef="Shares">2,636,899</ix:nonFraction></span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_98B_ecustom--ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingWeightedAverageExercisePrice_iE_c20210101__20210630_zHc7RRbT6gP6" title="Weighted Average Exercise Price, Warrants outstanding, Ending balance" style="padding-bottom: 2.5pt; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="CLSN:ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingWeightedAverageExercisePrice" contextRef="AsOf2021-06-30" format="ixt:numdotdecimal" decimals="INF" unitRef="USDPShares">1.40</ix:nonFraction></span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">Aggregate intrinsic value of outstanding
    warrants at June 30, 2021</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_98A_ecustom--ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionsOutstandingIntrinsicValue_iE_pp0p0_c20210101__20210630_zvgKs6wzw12k" title="Aggregate intrinsic value of outstanding warrants" style="border-bottom: Black 2.5pt double; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="CLSN:ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionsOutstandingIntrinsicValue" contextRef="AsOf2021-06-30" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">159,857</ix:nonFraction></span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt; text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td><span style="font-family: Times New Roman, Times, Serif">Weighted average remaining contractual terms at June 30, 2021</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span id="xdx_90E_ecustom--SharebasedCompensationArrangementBySharebasedPaymentAwardNonOptionsOutstandingWeightedAverageRemainingContractualTerm2_dtY_c20210101__20210630_ztBClSvcASZk" style="font: 10pt Times New Roman, Times, Serif"><ix:nonNumeric contextRef="From2021-01-01to2021-06-30" format="ixt-sec:duryear" name="CLSN:SharebasedCompensationArrangementBySharebasedPaymentAwardNonOptionsOutstandingWeightedAverageRemainingContractualTerm2">4.6</ix:nonNumeric>
                                            </span><span style="font: 10pt Times New Roman, Times, Serif">years</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  </table>

</ix:nonNumeric><p id="xdx_8AC_zR7J2T3aIpdh" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

</ix:nonNumeric><ix:nonNumeric contextRef="From2021-01-01to2021-06-30" escape="true" name="us-gaap:LesseeOperatingLeasesTextBlock"><p id="xdx_803_eus-gaap--LesseeOperatingLeasesTextBlock_z9DkxzCfoEOl" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><b>Note
16. <span id="xdx_823_zMZbPyAA0R7j">Leases</span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span id="xdx_908_eus-gaap--LesseeOperatingLeaseDescription_c20110701__20110731" style="font: 10pt Times New Roman, Times, Serif"><ix:nonNumeric contextRef="From2011-07-012011-07-31" name="us-gaap:LesseeOperatingLeaseDescription">In
2011, the Company executed a lease (the &#8220;Lease&#8221;) with Brandywine Operating Partnership, L.P. (Brandywine), a Delaware
limited partnership, for a</ix:nonNumeric> </span><span id="xdx_904_eus-gaap--AreaOfLand_iI_uSqft_c20110731_zBXAAeWbCo04" style="font: 10pt Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:AreaOfLand" contextRef="AsOf2011-07-31" format="ixt:numdotdecimal" decimals="INF" unitRef="Sqft">10,870</ix:nonFraction>
square foot premises located in Lawrenceville, New Jersey and relocated its offices to Lawrenceville, New Jersey from Columbia,
Maryland. The Lease had an initial term of </span><span id="xdx_900_eus-gaap--LesseeOperatingLeaseTermOfContract_iI_dtM_c20110731_zRZ2AjYuutEl" style="font: 10pt Times New Roman, Times, Serif"><ix:nonNumeric contextRef="AsOf2011-07-31" format="ixt-sec:durmonth" name="us-gaap:LesseeOperatingLeaseTermOfContract">66</ix:nonNumeric> </span><span style="font: 10pt Times New Roman, Times, Serif">months.
In late 2015, Lenox Drive Office Park LLC purchased the real estate and office building and assumed the Lease. This Lease was set to
expire on <span id="xdx_903_eus-gaap--LeaseExpirationDate1_dd_c20110701__20110731_zMDe2EcMKkyc"><ix:nonNumeric contextRef="From2011-07-012011-07-31" format="ixt:datemonthdayyearen" name="us-gaap:LeaseExpirationDate1">April 30, 2017</ix:nonNumeric></span></span><span style="font: 10pt Times New Roman, Times, Serif">.
In April 2017, the Company and the landlord amended the Lease effective May 1, 2017. The 1<sup>st</sup> Lease Amendment extended the
term of the agreement for an additional 64 months, reduced the premises to 7,565 square feet, reduced the monthly rent and provided
four months free rent. The monthly rent ranged from approximately $<span id="xdx_90D_eus-gaap--PaymentsForRent_c20210101__20210630__us-gaap--TypeOfArrangementAxis__custom--FirstLeaseAmendmentMember__us-gaap--AwardTypeAxis__custom--FirstYearMember_pp0p0"><ix:nonFraction name="us-gaap:PaymentsForRent" contextRef="From2021-01-012021-06-30_custom_FirstLeaseAmendmentMember_custom_FirstYearMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">18,900</ix:nonFraction> </span></span><span style="font: 10pt Times New Roman, Times, Serif">in
the first year to approximately $<span id="xdx_901_eus-gaap--PaymentsForRent_c20210101__20210630__us-gaap--TypeOfArrangementAxis__custom--FirstLeaseAmendmentMember__us-gaap--AwardTypeAxis__custom--FinalYearMember_pp0p0"><ix:nonFraction name="us-gaap:PaymentsForRent" contextRef="From2021-01-012021-06-30_custom_FirstLeaseAmendmentMember_custom_FinalYearMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">20,500</ix:nonFraction> </span></span><span style="font: 10pt Times New Roman, Times, Serif">in
the final year of the 1<sup>st</sup> Lease Amendment. Effective January 9, 2019, the Company amended the current terms of the
1<sup>st</sup> Lease Amendment to increase the size of the premises by 2,285 square feet to 9,850 square feet and also extended the
lease term by one year to September 1, 2023. The monthly rent ranges from approximately $<span id="xdx_90C_eus-gaap--PaymentsForRent_c20210101__20210630__us-gaap--TypeOfArrangementAxis__custom--SecondLeaseAmendmentMember__us-gaap--AwardTypeAxis__custom--FirstYearMember_pp0p0"><ix:nonFraction name="us-gaap:PaymentsForRent" contextRef="From2021-01-012021-06-30_custom_SecondLeaseAmendmentMember_custom_FirstYearMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">25,035</ix:nonFraction> </span></span><span style="font: 10pt Times New Roman, Times, Serif">in
the first year to approximately $<span id="xdx_908_eus-gaap--PaymentsForRent_c20210101__20210630__us-gaap--TypeOfArrangementAxis__custom--SecondLeaseAmendmentMember__us-gaap--AwardTypeAxis__custom--FinalYearMember_pp0p0"><ix:nonFraction name="us-gaap:PaymentsForRent" contextRef="From2021-01-012021-06-30_custom_SecondLeaseAmendmentMember_custom_FinalYearMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">27,088</ix:nonFraction> </span></span><span style="font: 10pt Times New Roman, Times, Serif">in
the final year of the 2<sup>nd</sup> Lease Amendment.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span id="xdx_907_eus-gaap--LesseeOperatingLeaseDescription_c20180101__20180131__us-gaap--TypeOfArrangementAxis__custom--EGENAssetPurchaseAgreementMember" style="font: 10pt Times New Roman, Times, Serif"><ix:nonNumeric contextRef="From2018-01-012018-01-31_custom_EGENAssetPurchaseAgreementMember" name="us-gaap:LesseeOperatingLeaseDescription">In
connection with the EGEN Asset Purchase Agreement in June 2014, the Company assumed the existing lease with another landlord for an</ix:nonNumeric> </span><span style="font: 10pt Times New Roman, Times, Serif"><span id="xdx_904_eus-gaap--AreaOfLand_iI_uSqft_c20201231__srt--StatementGeographicalAxis__custom--HuntsvilleAlabamaMember_z9VwuUYmSqsc"><ix:nonFraction name="us-gaap:AreaOfLand" contextRef="AsOf2020-12-31_custom_HuntsvilleAlabamaMember" format="ixt:numdotdecimal" decimals="INF" unitRef="Sqft">11,500</ix:nonFraction></span>
square foot premises located in Huntsville Alabama. In January 2018, the Company and the Huntsville landlord entered into a new
60-month lease which reduced the premises to 9,049 square feet with rent payments of approximately $</span><span id="xdx_90F_eus-gaap--PaymentsForRent_c20180101__20180131__us-gaap--TypeOfArrangementAxis__custom--EGENAssetPurchaseAgreementMember_pp0p0" style="font: 10pt Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:PaymentsForRent" contextRef="From2018-01-012018-01-31_custom_EGENAssetPurchaseAgreementMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">18,100</ix:nonFraction>
per month.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">We
adopted ASC Topic 842 on January 1, 2019 using the modified retrospective transition method for all lease arrangements at the beginning
of the period of adoption. Results for reporting periods beginning January 1, 2019 are presented under ASC 842, while prior period amounts
were not adjusted and continue to be reported in accordance with our historic accounting under Topic 840, Leases. The standard had a
material impact on our Condensed Consolidated Balance Sheet but had no impact on our condensed consolidated net earnings and cash flows.
The most significant impact of adopting ASC Topic 842 was the recognition of the right-of-use (ROU) asset and lease liabilities for operating
leases, which are presented in the following three-line items on the Consolidated Condensed Balance Sheet: (i) operating lease right-of-use
asset; (ii) current operating lease liabilities; and (iii) operating lease liabilities. Therefore, on date of adoption of ASC Topic 842,
the Company recognized a ROU asset of $<span id="xdx_90C_eus-gaap--OperatingLeaseRightOfUseAsset_iI_pn5n6_c20190102__us-gaap--AdjustmentsForNewAccountingPronouncementsAxis__us-gaap--AccountingStandardsUpdate201602Member_zEM04KJrnLI6"><ix:nonFraction name="us-gaap:OperatingLeaseRightOfUseAsset" contextRef="AsOf2019-01-02_us-gaap_AccountingStandardsUpdate201602Member" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">1.4</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million, operating lease liabilities, current
and non-current collectively, of $<span id="xdx_90A_eus-gaap--OperatingLeaseLiability_iI_pn5n6_c20190102__us-gaap--AdjustmentsForNewAccountingPronouncementsAxis__us-gaap--AccountingStandardsUpdate201602Member_zZKWm4rGCLUd"><ix:nonFraction name="us-gaap:OperatingLeaseLiability" contextRef="AsOf2019-01-02_us-gaap_AccountingStandardsUpdate201602Member" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">1.5</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million and reduced other liabilities by approximately
$<span id="xdx_909_eus-gaap--OtherLiabilities_iI_pn5n6_c20190102__us-gaap--AdjustmentsForNewAccountingPronouncementsAxis__us-gaap--AccountingStandardsUpdate201602Member_zNFw1wNi5JNa"><ix:nonFraction name="us-gaap:OtherLiabilities" contextRef="AsOf2019-01-02_us-gaap_AccountingStandardsUpdate201602Member" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">0.1</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million. We elected the package of practical
expedients for leases that commenced before the effective date of ASC Topic 842 whereby we elected to not reassess the following: (i)
whether any expired or existing contracts contain leases; (ii) the lease classification for any expired or existing leases; and (iii)
initial direct costs for any existing leases. In addition, we have lease agreements with lease and non-lease components, and we have
elected the practical expedient for all underlying asset classes and account for them as a single lease component. We have no finance
leases. We determine if an arrangement is a lease at inception. We have operating leases for office space and research and development
facilities. Neither of our leases include options to renew, however, one contains an option for early termination. We considered the
option of early termination in measurement of right-of-use assets and lease liabilities and we determined it is not reasonably certain
to be terminated. In connection with the 2<sup>nd</sup> Lease Amendment for the New Jersey office lease in January 2019, the Company
considered this as one modified lease and not as two separate leases. Therefore, in January 2019, the Company determined this lease was
an operating lease and remeasured the ROU asset and lease liability. Therefore, the Company increased the ROU asset and operating lease
liabilities by $<span id="xdx_903_eus-gaap--OperatingLeaseRightOfUseAsset_iI_pn5n6_c20190102_zlH6INxpkBfh"><ix:nonFraction name="us-gaap:OperatingLeaseRightOfUseAsset" contextRef="AsOf2019-01-02" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">0.4</ix:nonFraction></span></span> <span style="font: 10pt Times New Roman, Times, Serif">million
to $<span id="xdx_90D_eus-gaap--RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability_pn5n6_c20181230__20190102_z7H2dtHkWFhg"><ix:nonFraction name="us-gaap:RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability" contextRef="From2018-12-302019-01-02" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">1.8</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million and $<span id="xdx_904_eus-gaap--OperatingLeaseLiability_iI_pn5n6_c20190102_zi4Bxybj99Fe"><ix:nonFraction name="us-gaap:OperatingLeaseLiability" contextRef="AsOf2019-01-02" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">1.9</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million, respectively.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>


<ix:exclude><!-- Field: Page; Sequence: 25 -->
    <div style="border-bottom: Black 1.5pt solid; margin-bottom: 6pt"><table cellpadding="0" cellspacing="0" style="border-collapse: collapse; width: 100%; font-size: 10pt"><tr style="vertical-align: top; text-align: left"><td style="text-align: center; width: 100%"><!-- Field: Sequence; Type: Arabic; Name: PageNo -->22<!-- Field: /Sequence --></td></tr></table></div>
    <div style="break-before: page; margin-top: 6pt"><table cellpadding="0" cellspacing="0" style="border-collapse: collapse; width: 100%; font-size: 10pt"><tr style="vertical-align: top; text-align: left"><td style="text-align: center; width: 100%">&#160;</td></tr></table></div>
    <!-- Field: /Page --></ix:exclude>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<ix:nonNumeric contextRef="From2021-01-01to2021-06-30" escape="true" name="us-gaap:LesseeOperatingLeaseLiabilityMaturityTableTextBlock"><p id="xdx_890_eus-gaap--LesseeOperatingLeaseLiabilityMaturityTableTextBlock_z4RySOfHK1V8" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Following
is a table of the lease payments and maturity of our operating lease liabilities as of June 30, 2021:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;<span id="xdx_8B7_zyKGaaw0an66" style="display: none">Schedule
of Lease Payments and Maturity of Operating Lease Liabilities</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="vertical-align: bottom">
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" id="xdx_495_20210630_zE9yRm7JS5b1" style="border-bottom: Black 1.5pt solid; text-align: center"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>For
                                            the</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>year
                                            ending<br /> June 30,</b></span></p></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_40C_eus-gaap--LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_iI_pp0p0_maLOLLPzRpH_zbZY95qxpQc5" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left; width: 80%"><span style="font-family: Times New Roman, Times, Serif">Remainder of 2021</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td style="width: 16%; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths" contextRef="AsOf2021-06-30" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">266,188</ix:nonFraction></span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_402_eus-gaap--LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_iI_pp0p0_maLOLLPzRpH_z06zh07qOhj9" style="vertical-align: bottom; background-color: White">
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">2022</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo" contextRef="AsOf2021-06-30" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">535,579</ix:nonFraction></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_40B_eus-gaap--LesseeOperatingLeaseLiabilityPaymentsDueYearThree_iI_pp0p0_maLOLLPzRpH_zV55xrWo0Y9h" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">2023</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree" contextRef="AsOf2021-06-30" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">233,116</ix:nonFraction></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_409_ecustom--LesseeOperatingLeaseLiabilityPaymentsDueAfterYearThreeAndThereAfter_iI_pp0p0_maLOLLPzRpH_z8CQV3Hxu8o7" style="vertical-align: bottom; background-color: White">
    <td style="text-align: left; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">2024 and thereafter</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl1316">&#160;</span></span></td><td style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif">-</span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_40F_eus-gaap--LesseeOperatingLeaseLiabilityPaymentsDue_iTI_pp0p0_mtLOLLPzRpH_zxkN4KFxThYc" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">Subtotal future lease payments</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue" contextRef="AsOf2021-06-30" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">1,034,883</ix:nonFraction></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_409_ecustom--OperatingLeaseImputedInterest_iNI_pp0p0_di_zxa1wWigBvZ1" style="vertical-align: bottom; background-color: White">
    <td style="padding-left: 10pt; text-align: left; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">Less
    imputed interest</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif">(<ix:nonFraction name="CLSN:OperatingLeaseImputedInterest" contextRef="AsOf2021-06-30" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">101,664</ix:nonFraction></span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">)</span></td></tr>
  <tr id="xdx_404_eus-gaap--OperatingLeaseLiability_iI_pp0p0_zI5OOCubORAk" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">Total lease liabilities</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:OperatingLeaseLiability" contextRef="AsOf2021-06-30" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">933,219</ix:nonFraction></span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">Weighted average remaining
    life</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 1.5pt solid; text-align: right"><span id="xdx_905_eus-gaap--OperatingLeaseWeightedAverageRemainingLeaseTerm1_iI_dtY_c20210630_zDfXmVicMJyg" style="font: 10pt Times New Roman, Times, Serif"><ix:nonNumeric contextRef="AsOf2021-06-30" format="ixt-sec:duryear" name="us-gaap:OperatingLeaseWeightedAverageRemainingLeaseTerm1">2.0</ix:nonNumeric>
                                            </span><span style="font: 10pt Times New Roman, Times, Serif">years</span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left; padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">Weighted average discount
    rate</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 2.5pt double; text-align: right"><span id="xdx_90F_eus-gaap--OperatingLeaseWeightedAverageDiscountRatePercent_iI_pid_dp_c20210630_zcTGE2yTgdg2" style="font-family: Times New Roman, Times, Serif"><ix:nonFraction name="us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent" contextRef="AsOf2021-06-30" format="ixt:numdotdecimal" decimals="INF" scale="-2" unitRef="Percentage">9.98</ix:nonFraction></span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">%</span></td></tr>
  </table>

</ix:nonNumeric><p id="xdx_8A1_zAGTiCFuhki3" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">For
the three-month and six-month periods ended June 30, 2021, operating lease expense was $<span id="xdx_907_eus-gaap--OperatingLeaseCost_pp0p0_c20210401__20210630__us-gaap--TypeOfArrangementAxis__custom--OperatingLeasesMember_zGSiDGXz7GB4"><ix:nonFraction name="us-gaap:OperatingLeaseCost" contextRef="From2021-04-012021-06-30_custom_OperatingLeasesMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">130,595</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">and $<span id="xdx_90A_eus-gaap--OperatingLeaseCost_pp0p0_c20210101__20210630__us-gaap--TypeOfArrangementAxis__custom--OperatingLeasesMember_zluoCzg0oAki"><ix:nonFraction name="us-gaap:OperatingLeaseCost" contextRef="From2021-01-012021-06-30_custom_OperatingLeasesMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">261,190</ix:nonFraction></span></span><span style="font: 10pt Times New Roman, Times, Serif">,
respectively and cash paid for operating leases included in operating cash flows was $<span id="xdx_90B_eus-gaap--OperatingLeasePayments_pp0p0_c20210401__20210630__us-gaap--TypeOfArrangementAxis__custom--OperatingLeasesMember_zO3k0KyjPhJ4"><ix:nonFraction name="us-gaap:OperatingLeasePayments" contextRef="From2021-04-012021-06-30_custom_OperatingLeasesMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">132,684</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">and $<span id="xdx_90D_eus-gaap--OperatingLeasePayments_pp0p0_c20210101__20210630__us-gaap--TypeOfArrangementAxis__custom--OperatingLeasesMember_zObdCU54sZtb"><ix:nonFraction name="us-gaap:OperatingLeasePayments" contextRef="From2021-01-012021-06-30_custom_OperatingLeasesMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">264,546</ix:nonFraction></span></span><span style="font: 10pt Times New Roman, Times, Serif">,
respectively. For the three-month and six-month periods ended June 30, 2020, operating lease expense was $<span id="xdx_90A_eus-gaap--OperatingLeaseCost_pp0p0_c20200401__20200630__us-gaap--TypeOfArrangementAxis__custom--OperatingLeasesMember_zG5j5lJcByy8"><ix:nonFraction name="us-gaap:OperatingLeaseCost" contextRef="From2020-04-012020-06-30_custom_OperatingLeasesMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">130,595</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">and $<span id="xdx_903_eus-gaap--OperatingLeaseCost_c20200101__20200630__us-gaap--TypeOfArrangementAxis__custom--OperatingLeasesMember_pp0p0"><ix:nonFraction name="us-gaap:OperatingLeaseCost" contextRef="From2020-01-012020-06-30_custom_OperatingLeasesMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">261,190</ix:nonFraction></span></span><span style="font: 10pt Times New Roman, Times, Serif">,
respectively and cash paid for operating leases included in operating cash flows was $<span id="xdx_906_eus-gaap--OperatingLeasePayments_pp0p0_c20200401__20200630__us-gaap--TypeOfArrangementAxis__custom--OperatingLeasesMember_zwDlLDPXz3Ih"><ix:nonFraction name="us-gaap:OperatingLeasePayments" contextRef="From2020-04-012020-06-30_custom_OperatingLeasesMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">131,452</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">and $<span id="xdx_90D_eus-gaap--OperatingLeasePayments_c20200101__20200630__us-gaap--TypeOfArrangementAxis__custom--OperatingLeasesMember_pp0p0"><ix:nonFraction name="us-gaap:OperatingLeasePayments" contextRef="From2020-01-012020-06-30_custom_OperatingLeasesMember" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">262,084</ix:nonFraction></span></span><span style="font: 10pt Times New Roman, Times, Serif">,
respectively.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

</ix:nonNumeric><ix:nonNumeric contextRef="From2021-01-01to2021-06-30" escape="true" name="CLSN:LicensingTransactionTextBlock"><p id="xdx_80D_ecustom--LicensingTransactionTextBlock_zO0A5bLZs45e" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><b>Note
17. <span id="xdx_828_zHhke97mWmbc">Technology Development and Licensing Agreements</span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">On
May 7, 2012, the Company entered into a long-term commercial supply agreement with Zhejiang Hisun Pharmaceutical Co. Ltd. (Hisun) for
the production of ThermoDox<sup>&#174;</sup> in the China territory. In accordance with the terms of the agreement, Hisun will be responsible
for providing all of the technical and regulatory support services, including the costs of all technical transfer, registration and bioequivalence
studies, technical transfer costs, Celsion consultative support costs and the purchase of any necessary equipment and additional facility
costs necessary to support capacity requirements for the manufacture of ThermoDox<sup>&#174;</sup>. Celsion will repay Hisun for the aggregate
amount of these development costs and fees commencing on the successful completion of three registration batches of ThermoDox<sup>&#174;</sup>.
Hisun is also obligated to certain performance requirements under the agreement. The agreement will initially be limited to a percentage
of the production requirements of ThermoDox<sup>&#174;</sup> in the China territory with Hisun retaining an option for additional global
supply after local regulatory approval in the China territory. In addition, Hisun will collaborate with Celsion around the regulatory
approval activities for ThermoDox<sup>&#174; </sup>with the China State Food and Drug Administration (CHINA FDA). During the first quarter
of 2015, Hisun completed the successful manufacture of three registration batches of ThermoDox<sup>&#174;</sup>.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">On
January 18, 2013, we entered into a technology development contract with Hisun, pursuant to which Hisun paid us a non-refundable research
and development fee of $<span id="xdx_900_eus-gaap--ProceedsFromLicenseFeesReceived_pn6n6_c20130117__20130118__us-gaap--AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis__custom--HisunMember_zTQp5y8IH3Bg"><ix:nonFraction name="us-gaap:ProceedsFromLicenseFeesReceived" contextRef="From2013-01-172013-01-18_custom_HisunMember" format="ixt:numdotdecimal" decimals="-6" scale="6" unitRef="USD">5</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million to support our development of ThermoDox<sup>&#174;
</sup>in mainland China, Hong Kong and Macau (the China territory). Following our announcement on January 31, 2013 that the HEAT study
failed to meet its primary endpoint, Celsion and Hisun have agreed that the Technology Development Contract entered into on January 18,
2013 will remain in effect while the parties continue to collaborate and are evaluating the next steps in relation to ThermoDox<sup>&#174;</sup>,
which include the sub-group analysis of patients in the Phase III HEAT Study for the hepatocellular carcinoma clinical indication and
other activities to further the development of ThermoDox<sup>&#174; </sup>for the Greater China market. The $<span id="xdx_904_eus-gaap--DeferredRevenue_iI_pn5n6_c20130118__us-gaap--AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis__custom--HisunMember_z8sj8b8g9WSh"><ix:nonFraction name="us-gaap:DeferredRevenue" contextRef="AsOf2013-01-18_custom_HisunMember" format="ixt:numdotdecimal" decimals="-5" scale="6" unitRef="USD">5.0</ix:nonFraction>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million received as a non-refundable payment
from Hisun in the first quarter 2013 has been recorded to deferred revenue and will continue to be amortized over the <span id="xdx_90E_ecustom--DeferredRevenueAmortizationPeriod_dtY_c20130117__20130118__us-gaap--AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis__custom--HisunMember_zo2O5Gnooo6f"><ix:nonNumeric contextRef="From2013-01-172013-01-18_custom_HisunMember" format="ixt-sec:duryear" name="CLSN:DeferredRevenueAmortizationPeriod">10</ix:nonNumeric>
</span></span><span style="font: 10pt Times New Roman, Times, Serif">-year term of the agreement, until such time
as the parties find a mutually acceptable path forward on the development of ThermoDox<sup>&#174;</sup> based on findings of the ongoing
post-study analysis of the HEAT Study data.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">On
July 19, 2013, the Company and Hisun entered into a Memorandum of Understanding to pursue ongoing cooperation for the continued clinical
development of ThermoDox<sup>&#174;</sup> as well as the technology transfer relating to the commercial manufacture of ThermoDox<sup>&#174;
</sup>for the China territory. This expanded level of cooperation includes development of the next generation liposomal formulation with
the goal of creating safer, more efficacious versions of marketed cancer chemotherapeutics.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Among
the key provisions of the Celsion-Hisun Memorandum of Understanding are:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<table cellspacing="0" cellpadding="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; width: 0.5in; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><b>&#9679;</b></span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Hisun
    will provide the Company with internal resources necessary to complete the technology transfer of the Company&#8217;s proprietary
    manufacturing process and the production of registration batches for the China territory;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><b>&#9679;</b></span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Hisun
    will coordinate with the Company around the clinical and regulatory approval activities for ThermoDox<sup>&#174;</sup> as well as
    other liposomal formations with the CHINA FDA; and</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><b>&#9679;</b></span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Hisun
    will be granted a right of <i>first</i> offer for a commercial license to ThermoDox<sup>&#174;</sup> for the sale and distribution
    of ThermoDox<sup>&#174; </sup>in the China territory.</span></td></tr>
  </table>
<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>


<ix:exclude><!-- Field: Page; Sequence: 26 -->
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    <div style="break-before: page; margin-top: 6pt"><table cellpadding="0" cellspacing="0" style="border-collapse: collapse; width: 100%; font-size: 10pt"><tr style="vertical-align: top; text-align: left"><td style="text-align: center; width: 100%">&#160;</td></tr></table></div>
    <!-- Field: /Page --></ix:exclude>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">On
August 8, 2016, we signed a Technology Transfer, Manufacturing and Commercial Supply Agreement (&#8220;GEN-1 Agreement&#8221;) with Hisun
to pursue an expanded partnership for the technology transfer relating to the clinical and commercial manufacture and supply of GEN-1,
Celsion&#8217;s proprietary gene mediated, IL-12 immunotherapy, for the greater China territory, with the option to expand into other
countries in the rest of the world after all necessary regulatory approvals are in effect. The GEN-1 Agreement will help to support supply
for both ongoing and planned clinical studies in the U.S., and for potential future studies of GEN-1 in China. GEN-1 is currently being
evaluated by Celsion in first line ovarian cancer patients.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Key
provisions of the GEN-1 Agreement are as follows:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 9.9pt"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<table cellspacing="0" cellpadding="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; width: 0.5in"><span style="font: 10pt Times New Roman, Times, Serif"><b>&#9679;</b></span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">the
    GEN-1 Agreement has targeted unit costs for clinical supplies of GEN-1 that are substantially competitive with the Company&#8217;s
    current suppliers;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif"><b>&#9679;</b></span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">once
    approved, the cost structure for GEN-1 will support rapid market adoption and significant gross margins across global markets;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif"><b>&#9679;</b></span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Celsion
    will provide Hisun a certain percentage of China&#8217;s commercial unit demand, and separately of global commercial unit demand,
    subject to regulatory approval;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif"><b>&#9679;</b></span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Hisun
    and Celsion will commence technology transfer activities relating to the manufacture of GEN-1, including all studies required by
    CHINA FDA for site approval; and</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif"><b>&#9679;</b></span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Hisun
    will collaborate with Celsion around the regulatory approval activities for GEN-1 with the CHINA FDA. A local China partner affords
    Celsion access to accelerated CHINA FDA review and potential regulatory exclusivity for the approved indication.</span></td></tr>
  </table>
<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">The
Company evaluated the Hisun arrangement in accordance with ASC 606 and determined that its performance obligations under the agreement
include the non-exclusive, royalty-free license, research and development services to be provided by the Company, and its obligation
to serve on a joint committee. The Company concluded that the license was not distinct since its value is closely tied to the ongoing
research and development activities. As such, the license and the research and development services are bundled as a single performance
obligation. Since the provision of the license and research and development services are considered a single performance obligation,
the $<span id="xdx_900_ecustom--UpfrontPaymentBeingRecognized_c20210101__20210630_pp0p0"><ix:nonFraction name="CLSN:UpfrontPaymentBeingRecognized" contextRef="From2021-01-01to2021-06-30" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">5,000,000</ix:nonFraction></span></span> <span style="font: 10pt Times New Roman, Times, Serif">upfront
payment is being recognized as revenue ratably through 2022.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

</ix:nonNumeric><ix:nonNumeric contextRef="From2021-01-01to2021-06-30" escape="true" name="us-gaap:CommitmentsAndContingenciesDisclosureTextBlock"><p id="xdx_80A_eus-gaap--CommitmentsAndContingenciesDisclosureTextBlock_zq4ODTqpkxA7" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><b>Note
18. <span id="xdx_828_zf71VXYqeqia">Commitments and Contingencies</span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">On
September 20, 2019, a purported stockholder of the Company filed a derivative and putative class action lawsuit against the Company and
certain officers and directors (the &#8220;Shareholder Action&#8221;). The Company was a defendant in this derivative and putative class
action lawsuit in the Superior Court of New Jersey, Chancery Division, filed by a shareholder against the Company (as both a class action
defendant and nominal defendant), and certain of its officers and directors (the &#8220;Individual Defendants&#8221;), with the caption
<i>O&#8217;Connor v. Braun et al., Docket No. MER-C-000068-19</i> (the &#8220;Shareholder Action&#8221;). The Shareholder Action alleged
breaches of the defendants&#8217; fiduciary duties based on allegations that the defendants omitted or made improper statements when
seeking shareholder approval of the 2018 Stock Incentive Plan. The Shareholder Action sought, among other things, any damages sustained
by the Company as a result of the defendants&#8217; alleged wrongdoing, a declaratory judgment against all defendants invalidating the
2018 Stock Incentive Plan and declaring any awards made under the Plan invalid, rescinded, and subject to disgorgement, an order disgorging
the equity awards granted to the Individual Defendants under the 2018 Stock Incentive Plan, and attorneys&#8217; fees and costs.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">On
April 24, 2020, the Company, the Individual Defendants, and the plaintiff (the &#8220;Parties&#8221;) entered into a Settlement Agreement
and Release (the &#8220;Settlement Agreement&#8221;), which memorializes the terms of the Parties&#8217; settlement of the Shareholder
Action (the &#8220;Settlement&#8221;). The Settlement calls for repricing of certain stock options and payment of plaintiff legal fees
of $<span id="xdx_90B_eus-gaap--LitigationSettlementExpense_c20200422__20200424_pp0p0"><ix:nonFraction name="us-gaap:LitigationSettlementExpense" contextRef="From2020-04-222020-04-24" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">187,500</ix:nonFraction></span></span><span style="font: 10pt Times New Roman, Times, Serif">.
On July 24, 2020, the Court issued an order approving the Parties&#8217; proposed form of notice to shareholders regarding the Settlement.
A hearing was held on September 8, 2020 whereby the Court issued a final approval approving the Settlement. Pursuant to the Settlement,
the Company paid $<span id="xdx_90E_eus-gaap--PaymentsForLegalSettlements_c20201001__20201002_pp0p0"><ix:nonFraction name="us-gaap:PaymentsForLegalSettlements" contextRef="From2020-10-012020-10-02" format="ixt:numdotdecimal" decimals="0" scale="0" unitRef="USD">187,500</ix:nonFraction></span></span> <span style="font: 10pt Times New Roman, Times, Serif">on
October 1, 2020. Without admitting the validity of any of the claims asserted in the Shareholder Action, or any liability with respect
thereto, and expressly denying all allegations of wrongdoing, fault, liability, or damage against the Company and the Individual Defendants
arising out of any of the conduct, statements, acts or omissions alleged, or that could have been alleged, in the Shareholder Action,
the Company and the Individual Defendants concluded that it was desirable that the claims be settled on the terms and subject to the
conditions set forth in the Settlement Agreement. The Company and the Individual Defendants entered into the Settlement Agreement for
settlement purposes only and solely to avoid the cost and disruption of further litigation.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">On
October 29, 2020, a putative securities class action was filed against the Company and certain of its officers and directors (the &#8220;Spar
Individual Defendants&#8221;) in the U.S. District Court for the District of New Jersey, captioned <i>Spar v. Celsion Corporation, et
al.</i>, Case No. 1:20-cv-15228. The plaintiff alleges that the Company and Individual Defendants made false and misleading statements
regarding one of the Company&#8217;s product candidates, ThermoDox<sup>&#174;</sup>, and brings claims for damages under Section 10(b)
of the Exchange Act and Rule 10b-5 promulgated thereunder against all Defendants, and under Section 20(a) of the Exchange Act of 1934
against the Spar Individual Defendants. The Company believes that the case is without merit and intends to defend it vigorously. Due
to the early stage of the case neither the likelihood that a loss, if any, will be realized, nor an estimate of possible loss or range
of loss, if any, can be determined.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">In
February 2021, a derivative shareholder lawsuit was filed against the Company, as the nominal defendant, and certain of its directors
and officers as defendants in the U.S. District Court for the District of New Jersey, captioned <i>Fidler v. Michael H. Tardugno et al.</i>,
Case No. 3:21-cv-02662. The plaintiff alleges breach of fiduciary duty and other claims arising out of alleged statements made by certain
of the Company&#8217;s directors and/or officers regarding ThermoDox<sup>&#174;.</sup> The Company believes it has meritorious defenses
to these claims and intends to vigorously contest this suit. Due to the early stage of the case neither the likelihood that a loss, if
any, will be realized, nor an estimate of possible loss or range of loss, if any, can be determined.</span></p>

</ix:nonNumeric><p id="xdx_813_z4ZByowhqyqd" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>


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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif"><b>&#160;</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><b><span id="cr_009"></span>Item
2. MANAGEMENT&#8217;S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS.</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><i>The
following discussion and analysis of our financial condition and results of operations This discussion contains forward-looking statements
that involve risks and uncertainties. Our actual results may differ materially from those discussed in forward-looking statements. Factors
that might cause a difference include, but are not limited to, those discussed above under &#8220;Cautionary Note Regarding Forward-Looking
Statements&#8221;, and in Item 1A. Risk factors in our Annual Report on Form 10-K for the fiscal year ended December 31, 2020. </i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><b>Strategic
and Clinical Overview</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Celsion
Corporation (&#8220;Celsion&#8221; and the &#8220;Company&#8221;) is a fully integrated, clinical stage biotechnology company focused
on advancing a portfolio of innovative treatments including DNA-based immunotherapies, next generation vaccines and directed chemotherapies
through clinical trials and eventual commercialization. The Company&#8217;s product pipeline includes GEN-1, a DNA-based immunotherapy
for the localized treatment of ovarian cancer and ThermoDox<sup>&#174;</sup>, a proprietary heat-activated liposomal encapsulation of
doxorubicin, currently under investigator-sponsored development for several cancer indications. Celsion has two feasibility stage platform
technologies for the development of novel nucleic acid-based immunotherapies and next generation vaccines and other anti-cancer DNA or
RNA therapies. Both are novel synthetic, non-viral vectors with demonstrated capability in nucleic acid cellular transfection.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><b><i>IMMUNO-ONCOLOGY
Program</i></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">On
June 20, 2014, the Company completed the acquisition of substantially all of the assets of EGEN, a private company located in Huntsville,
Alabama. Pursuant to the Asset Purchase Agreement, CLSN Laboratories acquired all of EGEN&#8217;s right, title and interest in substantially
all of the assets of EGEN, including cash and cash equivalents, patents, trademarks and other intellectual property rights, clinical
data, certain contracts, licenses and permits, equipment, furniture, office equipment, furnishings, supplies and other tangible personal
property. A key asset acquired from EGEN was the TheraPlas technology platform. The first drug candidate developed from this technology
platform is GEN-1.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><b><i>THERAPLAS
Technology Platform</i></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">TheraPlas
is a technology platform for the delivery of DNA and mRNA therapeutics via synthetic non-viral carriers and is capable of providing cell
transfection for double-stranded DNA plasmids and large therapeutic RNA segments such as mRNA. There are two components of the TheraPlas
system, a plasmid DNA or mRNA payload encoding a therapeutic protein, and a delivery system. The delivery system is designed to protect
the DNA/mRNA from degradation and promote trafficking into cells and through intracellular compartments. We designed the delivery system
of TheraPlas by chemically modifying the low molecular weight polymer to improve its gene transfer activity without increasing toxicity.
We believe that TheraPlas may be a viable alternative to current approaches to gene delivery due to several distinguishing characteristics,
including enhanced molecular versatility that allows for complex modifications to potentially improve activity and safety.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">The
design of the TheraPlas delivery system is based on molecular functionalization of polyethyleneimine (PEI), a cationic delivery polymer
with a distinct ability to escape from the endosomes due to heavy protonation. The transfection activity and toxicity of PEI is tightly
coupled to its molecular weight; therefore, the clinical application of PEI is limited. We have used molecular functionalization strategies
to improve the activity of low molecular weight PEIs without augmenting their cytotoxicity. In one instance, chemical conjugation of
a low molecular weight branched BPEI1800 with cholesterol and polyethylene glycol (PEG) to form PEG-PEI-Cholesterol (PPC) dramatically
improved the transfection activity of BPEI1800 following in vivo delivery. Together, the cholesterol and PEG modifications produced approximately
20-fold enhancement in transfection activity. Biodistribution studies following intraperitoneal or subcutaneous administration of DNA/PPC
nanocomplexes showed DNA delivery localized primarily at the injection site with only small amount escaping into the systemic circulation.
PPC is the delivery component of our lead TheraPlas product, GEN-1, which is in clinical development for the treatment of ovarian cancer.
The PPC manufacturing process has been scaled up from bench scale (1-2 g) to 0.6Kg, and several current Good Manufacturing Practice (&#8220;cGMP&#8221;)
lots have been produced with reproducible quality.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">We
believe that TheraPlas has emerged as a viable alternative to current approaches due to several distinguishing characteristics such as
strong molecular versatility that may allow for complex modifications to potentially improve activity and safety with little difficulty.
The biocompatibility of these polymers reduces the risk of adverse immune response, thus allowing for repeated administration. Compared
to naked DNA or cationic lipids, TheraPlas is generally safer, more efficient, and cost effective. We believe that these advantages place
Celsion in a strong position to capitalize on this technology platform.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>


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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif"><b>&#160;</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><b>Ovarian
Cancer Overview</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Ovarian
cancer is the most lethal of gynecological malignancies among women with an overall five-year survival rate of 45%. This poor outcome
is due in part to the lack of effective prevention and early detection strategies. There were approximately 22,000 new cases of ovarian
cancer in the U.S. in 2014 with an estimated 14,000 deaths. Mortality rates for ovarian cancer declined very little in the last forty
years due to the unavailability of detection tests and improved treatments. Most women with ovarian cancer are not diagnosed until Stages
III or IV, when the disease has spread outside the pelvis to the abdomen and areas beyond causing swelling and pain, where the five-year
survival rates are 25 - 41 percent and 11 percent, respectively. First-line chemotherapy regimens are typically platinum-based combination
therapies. Although this first line of treatment has an approximate 80 percent response rate, 55 to 75 percent of women will develop
recurrent ovarian cancer within two years and ultimately will not respond to platinum therapy. Patients whose cancer recurs or progresses
after initially responding to surgery and first-line chemotherapy have been divided into one of the two groups based on the time from
completion of platinum therapy to disease recurrence or progression. This time period is referred to as platinum-free interval. The platinum-sensitive
group has a platinum-free interval of longer than six months. This group generally responds to additional treatment with platinum-based
therapies. The platinum-resistant group has a platinum-free interval of shorter than six months and is resistant to additional platinum-based
treatments. Pegylated liposomal doxorubicin, topotecan, and Avastin are the only approved second-line therapies for platinum-resistant
ovarian cancer. The overall response rate for these therapies is 10 to 20 percent with median overall survival (&#8220;OS&#8221;) of
eleven to twelve months. Immunotherapy is an attractive novel approach for the treatment of ovarian cancer particularly since ovarian
cancers are considered immunogenic tumors. IL-12 is one of the most active cytokines for the induction of potent anti-cancer immunity
acting through the induction of T-lymphocyte and natural killer cell proliferation. The precedence for a therapeutic role of IL-12 in
ovarian cancer is based on epidemiologic and preclinical data.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><b>GEN-1
Immunotherapy</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">GEN-1
is a DNA-based immunotherapeutic product candidate for the localized treatment of ovarian cancer by intraperitoneally administering an
Interleukin-12 (&#8220;IL-12&#8221;) plasmid formulated with our proprietary TheraPlas delivery system. In this DNA-based approach, the
immunotherapy is combined with a standard chemotherapy drug, which can potentially achieve better clinical outcomes than with chemotherapy
alone. We believe that increases in IL-12 concentrations at tumor sites for several days after a single administration could create a
potent immune environment against tumor activity and that a direct killing of the tumor with concomitant use of cytotoxic chemotherapy
could result in a more robust and durable antitumor response than chemotherapy alone. We believe the rationale for local therapy with
GEN-1 is based on the following:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<table cellspacing="0" cellpadding="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#9679;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Loco-regional
    production of the potent cytokine IL-12 avoids toxicities and poor pharmacokinetics associated with systemic delivery of recombinant
    IL-12;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#9679;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Persistent
    local delivery of IL-12 lasts up to one week and dosing can be repeated; and</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#9679;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Local
    therapy is ideal for long-term maintenance therapy.</span></td></tr>
  </table>
<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><b><i>OVATION
I Study.</i></b> In February 2015, we announced that the U.S. Food and Drug Administration (&#8220;FDA&#8221;) accepted, without objection,
the Phase I dose-escalation clinical trial of GEN-1 in combination with the standard of care in neoadjuvant ovarian cancer (the &#8220;OVATION
I Study&#8221;). On September 30, 2015, we announced enrollment of the first patient in the OVATION I Study. The OVATION I Study was
designed to:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<table cellspacing="0" cellpadding="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">(i)</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">identify
    a safe, tolerable and therapeutically active dose of GEN-1 by recruiting and maximizing an immune response;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">(ii)</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">enroll
    three to six patients per dose level and evaluate safety and efficacy; and</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">(iii)</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">attempt
    to define an optimal dose for a follow-on Phase I/II study.</span></td></tr>
  </table>
<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">In
addition, the OVATION I Study established a unique opportunity to assess how cytokine-based compounds such as GEN-1, directly affect
ovarian cancer cells and the tumor microenvironment in newly diagnosed ovarian cancer patients. The study was designed to characterize
the nature of the immune response triggered by GEN-1 at various levels of the patients&#8217; immune system, including:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<table cellspacing="0" cellpadding="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#9679;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Infiltration
    of cancer fighting T-cell lymphocytes into primary tumor and tumor microenvironment including peritoneal cavity, which is the primary
    site of metastasis of ovarian cancer;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#9679;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Changes
    in local and systemic levels of immuno-stimulatory and immunosuppressive cytokines associated with tumor suppression and growth,
    respectively; and</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#9679;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Expression
    profile of a comprehensive panel of immune related genes in pre-treatment and GEN-1-treated tumor tissue.</span></td></tr>
  </table>
<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>


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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">We
initiated the OVATION I Study at four clinical sites at the University of Alabama at Birmingham, Oklahoma University Medical Center,
Washington University in St. Louis, and the Medical College of Wisconsin. During 2016 and 2017, we announced data from the first fourteen
patients in the OVATION I Study. On October 3, 2017, we announced final translational research and clinical data from the OVATION I Study.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Key
translational research findings from all evaluable patients are consistent with the earlier reports from partial analysis of the data
and are summarized below:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<table cellspacing="0" cellpadding="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#9679;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">The
    intraperitoneal treatment of GEN-1 in conjunction with NACT resulted in dose dependent increases in IL-12 and Interferon-gamma (IFN-&#947;)
    levels that were predominantly in the peritoneal fluid compartment with little to no changes observed in the patients&#8217; systemic
    circulation. These and other post-treatment changes including decreases in VEGF levels in peritoneal fluid are consistent with an
    IL-12 based immune mechanism;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#9679;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Consistent
    with the previous partial reports, the effects observed in the IHC analysis were pronounced decreases in the density of immunosuppressive
    T-cell signals (Foxp3, PD-1, PDL-1, IDO-1) and increases in CD8+ cells in the tumor microenvironment;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#9679;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">The
    ratio of CD8+ cells to immunosuppressive cells was increased in approximately 75% of patients suggesting an overall shift in the
    tumor microenvironment from immunosuppressive to pro-immune stimulatory following treatment with GEN-1. An increase in CD8+ to immunosuppressive
    T-cell populations is a leading indicator and believed to be a good predictor of improved OS; and</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#9679;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Analysis
    of peritoneal fluid by cell sorting, not reported before, shows a treatment-related decrease in the percentage of immunosuppressive
    T-cell (Foxp3+), which is consistent with the reduction of Foxp3+ T-cells in the primary tumor tissue, and a shift in tumor na&#239;ve
    CD8+ cell population to more efficient tumor killing memory effector CD8+ cells.</span></td></tr>
  </table>
<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">The
Company also reported positive clinical data from the first fourteen patients who completed treatment in the OVATION I Study. GEN-1 plus
standard chemotherapy produced no dose limiting toxicities and positive dose dependent efficacy signals which correlate well with positive
surgical outcomes as summarized below:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<table cellspacing="0" cellpadding="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#9679;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Of
    the fourteen patients treated in the entire study, two patients demonstrated a complete response, ten patients demonstrated a partial
    response and two patients demonstrated stable disease, as measured by RECIST criteria. This translates to a 100% disease control
    rate and an 86% objective response rate (&#8220;ORR&#8221;). Of the five patients treated in the highest dose cohort, there was a
    100% ORR with one complete response and four partial responses;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  </table>
<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<table cellspacing="0" cellpadding="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#9679;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Fourteen
    patients had successful resections of their tumors, with nine patients (64%) having a complete tumor resection (&#8220;R0&#8221;),
    which indicates a microscopically margin-negative resection in which no gross or microscopic tumor remains in the tumor bed. Seven
    out of eight (88%) patients in the highest two dose cohorts experienced a R0 surgical resection. All five patients treated at the
    highest dose cohort experienced a R0 surgical resection; and</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; width: 24px; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 24px; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#9679;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">All
    patients experienced a clinically significant decrease in their CA-125 protein levels as of their most recent study visit. CA-125
    is used to monitor certain cancers during and after treatment. CA-125 is present in greater concentrations in ovarian cancer cells
    than in other cells.</span></td></tr>
  </table>
<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; background-color: white"><span style="font: 10pt Times New Roman, Times, Serif">On
March 2, 2019, the Company announced final progression free survival (&#8220;PFS&#8221;) results from the OVATION I Study. Median PFS
in patients treated per protocol (n=14) was 21 months and was 17.1 months for the intent-to-treat (&#8220;ITT&#8221;) population (n=18)
for all dose cohorts, including three patients who dropped out of the study after 13 days or less, and two patients who did not receive
full NAC and GEN-1 cycles. Under the current standard of care, in women with Stage III/IV ovarian cancer undergoing NAC, their disease
progresses within about 12 months on average. The results from the OVATION I Study support continued evaluation of GEN-1 based on promising
tumor response, as reported in the PFS data, and the ability for surgeons to completely remove visible tumor at interval debulking surgery.
GEN-1 was well tolerated, and no dose-limiting toxicities were detected. Intraperitoneal administration of GEN-1 was feasible with broad
patient acceptance.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><b><i>OVATION
2 Study.</i></b> The Company held an Advisory Board Meeting on September 27, 2017 with the clinical investigators and scientific experts
including those from Roswell Park Cancer Institute, Vanderbilt University Medical School, and M.D. Anderson Cancer Center to review and
finalize clinical, translational research and safety data from the OVATION I Study in order to determine the next steps forward for our
GEN-1 immunotherapy program.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>


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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">On
November 13, 2017, the Company filed its Phase I/II clinical trial protocol with the FDA for GEN-1 for the localized treatment of ovarian
cancer. The protocol is designed with a single dose escalation phase to 100 mg/m&#178; to identify a safe and tolerable dose of GEN-1
while maximizing an immune response. The Phase I portion of the study will be followed by a continuation at the selected dose in approximately
110 patients randomized Phase II study.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">In
the OVATION 2 Study, patients in the GEN-1 treatment arm will receive GEN-1 plus chemotherapy pre- and post-interval debulking surgery
(&#8220;IDS&#8221;). The OVATION 2 Study will include up to 110 patients with Stage III/IV ovarian cancer, with 12 to 15 patients in
the Phase I portion and up to 95 patients in Phase II. The study is powered to show a 33% improvement in the primary endpoint, PFS, when
comparing GEN-1 with neoadjuvant + adjuvant chemotherapy versus neoadjuvant + adjuvant chemotherapy alone. The PFS primary analysis will
be conducted after at least 80 events have been observed or after all patients have been followed for at least 16 months, whichever is
later.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">In
March 2020, the Company announced encouraging initial clinical data from the first 15 patients enrolled in the Phase I portion of the
OVATION 2 Study for patients newly diagnosed with Stage III and IV ovarian cancer. The OVATION 2 Study combines GEN-1, the Company&#8217;s
IL-12 gene-mediated immunotherapy, with standard-of-care neoadjuvant chemotherapy (NACT). Following NACT, patients undergo interval debulking
surgery (IDS), followed by three additional cycles of chemotherapy.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">GEN-1
plus standard NACT produced positive dose-dependent efficacy results, with no dose-limiting toxicities, which correlates well with successful
surgical outcomes as summarized below:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<table cellspacing="0" cellpadding="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#9679;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Of
    the 15 patients treated in the Phase I portion of the OVATION 2 Study, nine patients were treated with GEN-1 at a dose of 100 mg/m&#178;
    plus NACT and six patients were treated with NACT only. All 15 patients had successful resections of their tumors, with eight out
    of nine patients (88%) in the GEN-1 treatment arm having an R0 resection, which indicates a microscopically margin-negative complete
    resection in which no gross or microscopic tumor remains in the tumor bed. Only three out of six patients (50%) in the NACT only
    treatment arm had a R0 resection.</span></td></tr>
  </table>
<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<table cellspacing="0" cellpadding="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in"><span style="font: 10pt Times New Roman, Times, Serif">&#9679;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">When
    combining these results with the surgical resection rates observed in the Company&#8217;s prior Phase Ib dose-escalation trial (the
    OVATION 1 Study), a population of patients with inclusion criteria identical to the OVATION 2 Study, the data reflect the strong
    dose-dependent efficacy of adding GEN-1 to the current standard of care NACT:</span></td></tr>
  </table>
<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; margin-left: auto; border-collapse: collapse; width: 85%; margin-right: auto">
  <tr style="vertical-align: bottom">
    <td style="text-align: center"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: center"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"><span style="font-family: Times New Roman, Times, Serif">%
    of <br /> Patients<br /> with R0 <br /> Resections</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="width: 62%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">0, 36, 47 mg/m&#178; of GEN-1 plus
    NACT</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 16%; text-align: right"><span style="font-family: Times New Roman, Times, Serif">n=12</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="width: 16%; text-align: right"><span style="font-family: Times New Roman, Times, Serif">42</span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">%</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">61, 79, 100 mg/m&#178; of GEN-1 plus NACT</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">n=17</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">82</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">%</span></td></tr>
  </table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 0.5in; text-align: justify; text-indent: 0.5in"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<table cellspacing="0" cellpadding="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#9679;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">The
    ORR as measured by Response Evaluation Criteria in Solid Tumors (RECIST) criteria for the 0, 36, 47 mg/m&#178; dose GEN-1 patients
    were comparable, as expected, to the higher (61, 79, 100 mg/m&#178;) dose GEN-1 patients, with both groups demonstrating an approximate
    80% ORR.</span></td></tr>
  </table>
<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">On
March 23, 2020, the Company announced that the European Medicines Agency (the &#8220;EMA&#8221;) Committee for Orphan Medicinal Products
(&#8220;COMP&#8221;) has recommended that GEN-1 be designated as an orphan medicinal product for the treatment of ovarian cancer. GEN-1
is an IL-12 DNA plasmid vector encased in a non-viral nanoparticle delivery system, which enables cell transfection followed by persistent,
local secretion of the IL-12 protein. GEN-1 previously received orphan designation from the FDA.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">On
March 26, 2020, the Company announced with Medidata, a Dassault Syst&#232;mes company, that examining matched patient data provided
by Medidata in a synthetic control arm (&#8220;SCA&#8221;) with results from the Company&#8217;s completed Phase Ib dose-escalating OVATION
I Study showed positive results in progression-free survival (&#8220;PFS&#8221;). The hazard ratio (&#8220;HR&#8221;) was 0.53 in the
ITT group, showing strong signals of efficacy. Celsion believes these data may warrant consideration of strategies to accelerate the
clinical development program for GEN-1 in newly diagnosed, advanced ovarian cancer patients by the FDA. In its March 2019 discussion
with Celsion, the FDA noted that preliminary findings from the Phase Ib OVATION I Study were exciting but lacked a control group to evaluate
GEN-1&#8217;s independent impact on impressive tumor response, surgical results and PFS. The FDA encouraged the Company to continue its
GEN-1 development program and consult with FDA with new findings that may have a bearing on designations such as Fast Track and Breakthrough
Therapy.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">SCAs
have the potential to revolutionize clinical trials in certain oncology indications and some other diseases where a randomized control
is not ethical or practical. SCAs are formed by carefully selecting control patients from historical clinical trials to match the demographic
and disease characteristics of the patients treated with the new investigational product. SCAs have been shown to mimic the results of
traditional randomized controls so that the treatment effects of an investigational product can be visible by comparison to the SCA.
SCAs can help advance the scientific validity of single arm trials, and in certain indications, reduce time and cost, and expose fewer
patients to placebos or existing standard-of-care treatments that might not be effective for them.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>


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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">On
July 27, 2020, the Company announced the randomization of the first two patients in the Phase II portion of the OVATION 2 Study with
GEN-1 in advanced ovarian cancer. The Company anticipates completing enrollment of up to 110 patients in the second half of 2021. Because
this is an open-label study, the Company intends to provide clinical updates throughout the course of treatment including response rates
and surgical resection scores.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">In
February 2021, the Company announced that it has received Fast Track designation from the FDA for GEN-1, its DNA-mediated IL-12 immunotherapy
currently in Phase II development for the treatment of advanced ovarian cancer and also provided an update on the OVATION 2 Study. The
Company reported that approximately one-third, or 34 patients, of the anticipated 110 patients had been enrolled into the OVATION 2 Study,
of which 20 are in the treatment arm and 14 are in the control. Currently, 27 patients have had their interval debulking surgery with
the following results:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<table cellspacing="0" cellpadding="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#9679;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">12
    of 15, or 80%, of patients treated with GEN-1 had a R0 resection, which indicates a microscopically margin-negative complete resection
    in which no gross or microscopic tumor remains in the tumor bed.</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#9679;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">7
    of 12 patients, or 58%, of patients in the control arm had an R0 resection.</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif">&#9679;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">This
    interim data represents a 38% improvement in R0 resection rates for GEN-1 patients compared with control arm patients and is consistent
    with the reported improvement in resection scores noted in the encouraging Phase I OVATION I Study, the manuscript of which has been
    submitted for peer review publication.</span></td></tr>
  </table>
<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">The
Company further reported that 22 clinical sites in the U.S. and Canada have been initiated, with three more sites expected to be added
by the end of the first quarter. Clinical investigators met in early February 2021 in a virtual meeting and expressed excitement about
the potential for GEN-1 to treat advanced ovarian cancer and, despite the challenges and earlier delays posed by the COVID-19 pandemic,
they remain committed to completing enrollment in the study during the second half of 2021.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><b><i>PLACCINE
DNA VACCINE TECHNOLOGY PLATFORM</i></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">In
January 2021, the Company announced the filing of a provisional U.S. patent application for a novel DNA-based, investigational vaccine
for preventing or treating infections from a broad range of infectious agents including the coronavirus disease using its PLACCINE DNA
vaccine technology platform (&#8220;PLACCINE&#8221;). The provisional patent covers a family of novel composition of multi-cistronic
vectors and polymeric nanoparticles that comprise the PLACCINE DNA vaccine platform technology for preventing or treating infectious
agents that have the potential for global pandemics, including the SARS-CoV-2 virus and its variations, using the Company&#8217;s platform
technology.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Celsion&#8217;s
PLACCINE DNA vaccine technology platform is characterized by a single multi-cistronic DNA plasmid vector expressing multiple pathogen
antigens along with a potent immune modifier and delivered with a synthetic delivery system. It is easily adaptable to creating vaccines
for a multitude of pathogens, including emerging pathogens leading to pandemics as well as infectious diseases that have yet to be effectively
addressed with current vaccine technologies. This flexible vaccine platform is well supported by an already established supply chain
to produce any plasmid vector and its assembly into a respective vaccine formulation.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">PLACCINE
is an extension of the Company&#8217;s synthetic, non-viral TheraPlas delivery technology currently in a Phase II trial for the treatment
of late-stage ovarian cancer with GEN-1. Celsion&#8217;s proprietary multifunctional DNA vaccine technology concept is built on the flexible
PLACCINE technology platform that is amenable to rapidly responding to the SARS-CoV-2 virus, as well as possible future mutations of
SARS-CoV-2, other future pandemics, emerging bioterrorism threats, and novel infectious diseases. Celsion&#8217;s extensive experience
with TheraPlas suggests that the PLACCINE-based nanoparticles are stable at storage temperatures of 4<sup>o</sup>C to 25<sup>o</sup>C,
making vaccines developed on this platform easily suitable for broad world-wide distribution.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Celsion&#8217;s
vaccine approach is designed to optimize the quality of the immune response dictating the efficiency of pathogen clearance and patient
recovery. Celsion has taken a multivalent approach in an effort to generate an even more robust immune response that not only results
in a strong neutralizing antibody response, but also a more robust and durable T-cell response. Delivered with Celsion&#8217;s synthetic
polymeric system, the proprietary DNA plasmid is protected from degradation and its cellular uptake is facilitated.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>


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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><b>COVID-19
Vaccine Overview</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Emerging
data from the recent literature indicates that the quality of the immune response as opposed to its absolute magnitude is what dictates
SARS-CoV-2 viral clearance and recovery and that an ineffective or non-neutralizing enhanced antibody response might actually exacerbate
disease. The first-generation COVID-19 vaccines were developed for rapid production and deployment and were not optimized for generating
cellular responses that result in effective viral clearance. Though early data has indicated some of these vaccines to be over 95% effective,
these first-generation vaccines were primarily designed to generate a strong antibody response and, while they have been shown to provide
prophylactic protection against disease, the durability of this protection is currently unclear. The vast majority of these vaccines
have been specifically developed to target the SARS-CoV-2 Spike (S) protein (antigen), though it is known that restricting a vaccine
to a sole viral antigen creates selection pressure that can serve to facilitate the emergence of viral resistance. Indeed, even prior
to full vaccine rollout, it has been observed that the S protein is a locus for rapid evolutionary and functional change as evidenced
by the D614G, Y453F, 501Y.V2, and VUI-202012/01 mutations/deletions. This propensity for mutation of the S protein leads to future risk
of efficacy reduction over time as these mutations accumulate.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><b>Our
Next Generation Vaccine Initiative</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Celsion&#8217;s
next generation vaccine initiative stands at the confluence of immunotherapy and immunogenicity and envisions delivery, on a single plasmid,
multiple SARS-CoV-2 antigens in conjunction with a potent immune modifier, interleukin-12 (IL-12), which directs a TH-1 immune response,
stimulates T-cell immunity, and also promises the promotion of humoral immunity (antibody response). While most COVID-19 vaccines in
late-stage clinical development are monovalent (S protein antigen only), Celsion has taken this multivalent approach in an effort to
generate an even more robust immune response that not only results in a strong neutralizing antibody response, but also a more robust
and durable T-cell response.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Celsion&#8217;s
vaccine candidate approach comprises a single plasmid vector containing the DNA sequence encoding the cytokine IL-12 and multiple SARS-CoV-2
antigens, including S antigen in combination with the membrane (M) or nucleocapsid (N) antigen. Delivery will be evaluated intramuscularly,
intradermally, or subcutaneously with a non-viral synthetic DNA delivery carrier that facilitates vector delivery into the cells of the
injected tissue and has potential immune adjuvant properties. Unique designs and formulations of Celsion vaccine candidates may offer
several potential key advantages.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<table cellspacing="0" cellpadding="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#9679;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">While
    the antibodies against S antigen would prevent virus entry into cells, the M and N antibodies could help virus clearance through
    antibody-mediated opsonization and phagocytosis. The presentation of multiple antigens on the cell surface of vaccine-injected tissue
    produces a broad variety of killer T-cells which could potentially produce more efficient viral clearance than a single antigen vaccine.</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#9679;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Since
    IL-12 is an essential regulator of the differentiation, proliferation, and maintenance of T helper 1 (TH-1) cells that generate killer
    T-cells and memory T-cells against virally infected cells, its simultaneous expression could boost the viral clearance by the vaccine
    and improve the immune system&#8217;s memory against any future exposure of the same virus.</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#9679;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Finally,
    the synthetic polymeric DNA carrier is an important component of the vaccine composition as it has the potential to facilitate the
    vaccine immunogenicity by improving vector delivery and, due to potential adjuvant properties, attract professional immune cells
    to the site of vaccine delivery.</span></td></tr>
  </table>
<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Future
vaccine technology will need to address viral mutations and the challenges of efficient manufacturing, distribution, and storage. We
believe an adaptation of our TheraPlas technology, PLACCINE, has the potential to meet these challenges. Our approach is described in
our provisional patent filing and is summarized as a DNA vaccine technology platform characterized by a single plasmid DNA with multiple
coding regions. The plasmid vector is designed to express multiple pathogen antigens along with a potent immune modifier. It is delivered
via a synthetic delivery system and has the potential to be easily modified to create vaccines against a multitude of infectious diseases,
addressing:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<table cellspacing="0" cellpadding="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#9679;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><b>Viral
    Mutations</b>: PLACCINE may offer broad-spectrum and mutational resistance (variants) by targeting multiple antigens on a single
    plasmid vector.</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#9679;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><b>Enhanced
    Efficacy</b>: The potent immune modifier IL-12 may improve humoral and cellular responses to viral antigens and can be incorporated
    in the plasmid.</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#9679;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><b>Durable
    Efficacy</b>: PLACCINE delivers a DNA plasmid-based antigen that can result in durable antigen exposure and a robust vaccine response
    to viral antigens.</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#9679;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><b>Storage
    &amp; Distribution</b>: PLACCINE allows for stability that is compatible with manageable vaccine storage and distribution.</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#9679;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><b>Simple
    Dosing &amp; Administration</b>: PLACCINE is a synthetic delivery system that should require a simple injection that does not require
    viruses or special equipment to deliver its payload.</span></td></tr>
  </table>
<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>


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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">We
are conducting preliminary research associated with our recently announced proprietary DNA vaccine platform provisional patent filing.
At the same time, we are redoubling our efforts and R&amp;D resources in our immuno-oncology and next generation vaccine program.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><b>THERMODOX<sup>&#174;
</sup>- DIRECTED CHEMOTHERAPY</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Liposomes
are manufactured submicroscopic vesicles consisting of a discrete aqueous central compartment surrounded by a membrane bilayer composed
of naturally occurring lipids. Conventional liposomes have been designed and manufactured to carry drugs and increase residence time,
thus allowing the drugs to remain in the bloodstream for extended periods of time before they are removed from the body. However, the
current existing liposomal formulations of cancer drugs and liposomal cancer drugs under development do not provide for the immediate
release of the drug and the direct targeting of organ specific tumors, two important characteristics that are required for improving
the efficacy of cancer drugs such as doxorubicin. A team of research scientists at Duke University developed a heat-sensitive liposome
that rapidly changes its structure when heated to a threshold minimum temperature of 39.5&#186; to 42&#186; Celsius. Heating creates
channels in the liposome bilayer that allow an encapsulated drug to rapidly disperse into the surrounding tissue. This novel, heat-activated
liposomal technology is differentiated from other liposomes through its unique low heat-activated release of encapsulated chemotherapeutic
agents. We are able to use several available focused-heat technologies, such as radiofrequency ablation (&#8220;RFA&#8221;), microwave
energy and high intensity focused ultrasound (&#8220;HIFU&#8221;), to activate the release of drugs from our novel heat sensitive liposomes.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><b><i>THERMODOX<sup>&#174;
</sup>for the Treatment of Primary Liver Cancer</i></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><b>Primary
Liver Cancer Overview</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Hepatocellular
carcinoma (&#8220;HCC&#8221;) is one of the most common and deadliest forms of cancer worldwide. It ranks as the third most common solid
tumor cancer. It is estimated that up to 90% of liver cancer patients will die within five years of diagnosis. The incidence of primary
liver cancer is approximately 35,000 cases per year in the U.S., approximately 65,000 cases per year in Europe and is increasing at approximately
2-3% per year worldwide. Global incidence (per 2017 GLOBALCAN statistics) is reported at 755,000 cases. The World Health Organization
(the &#8220;WHO&#8221;) has projected that HCC will be the most prevalent form of cancer by 2030. HCC is commonly diagnosed in patients
with longstanding hepatic disease and cirrhosis (primarily due to hepatitis C in the U.S., Japan and Europe and hepatitis B in Asia).</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">At
an early stage, the standard first line treatment for liver cancer is surgical resection of the tumor. Up to 80% of patients are ineligible
for surgery or transplantation at time of diagnosis because early-stage liver cancer generally has few symptoms and when finally detected
the tumor frequently is too large for surgical resection. There are few alternative treatments since radiation therapy and chemotherapy
are largely ineffective in treating liver cancer. For tumors generally up to 5 centimeters in diameter, RFA has emerged as the standard
of care treatment which directly destroys the tumor tissue through the application of high temperatures administered by a probe inserted
into the core of the tumor. Local recurrence rates after RFA directly correlate to the size of the tumor. For tumors 3 cm or smaller
in diameter the recurrence rate has been reported to be 10 &#8211; 20%; however, for tumors greater than 3 cm, local recurrence rates
of 40% or higher have been observed.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><b>Celsion&#8217;s
Approach</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">While
RFA uses extremely high temperatures (greater than 90&#176; Celsius) to ablate the tumor, it may fail to treat micro-metastases in the
outer margins of the ablation zone because temperatures in the periphery may not be high enough to destroy cancer cells. Our ThermoDox&#174;
treatment approach is designed to utilize the ability of RFA devices to ablate the center of the tumor while simultaneously thermally
activating our ThermoDox&#174; liposome to release its encapsulated doxorubicin to kill any remaining viable cancer cells throughout the
heated region, including the ablation margins. This novel treatment approach is intended to deliver the drug directly to those cancer
cells that survive RFA. This approach is designed to increase the delivery of the doxorubicin at the desired tumor site while potentially
reducing drug exposure distant to the tumor site.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><b><i>OPTIMA
Study</i></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">The
OPTIMA Study represents an evaluation of ThermoDox<sup>&#174;</sup> in combination with a first line therapy, RFA, for newly diagnosed,
intermediate stage HCC patients. The OPTIMA Study was designed to enroll up to 550 patients globally at approximately 65 clinical sites
in the U.S., Canada, European Union (EU), China and other countries in the Asia-Pacific region and will evaluate ThermoDox<sup>&#174;
</sup>in combination with standardized RFA, which will require a minimum of 45 minutes across all investigators and clinical sites for
treating lesions three to seven centimeters, versus standardized RFA alone. The primary endpoint for the OPTIMA Study is OS, and the
secondary endpoints are progression free survival and safety. The statistical plan calls for two interim efficacy analyses by an independent
Data Monitoring Committee (&#8220;DMC&#8221;).</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>


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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">On
February 24, 2014, we announced that the FDA provided clearance for the OPTIMA Study, which is a pivotal, double-blind, placebo-controlled
Phase III trial of ThermoDox<sup>&#174;</sup>, in combination with standardized RFA, for the treatment of primary liver cancer. The trial
design of the OPTIMA Study is based on the comprehensive analysis of data from an earlier Phase III clinical trial called the HEAT Study
(the &#8220;HEAT Study&#8221;). The OPTIMA Study is supported by a hypothesis developed from an OS analysis of a large subgroup of patients
from the HEAT Study.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Post-hoc
data analysis from our earlier Phase III HEAT Study suggests that ThermoDox<sup>&#174;</sup> may substantially improve OS, when compared
to the control group, in patients if their lesions undergo a 45-minute RFA procedure standardized for a lesion greater than 3 cm in diameter.
Data from nine OS sweeps have been conducted since the top line progression free survival PFS data from the HEAT Study were announced
in January 2013, with each data set demonstrating substantial improvement in clinical benefit over the control group with statistical
significance. On August 15, 2016, we announced updated results from its final retrospective OS analysis of the data from the HEAT Study.
These results demonstrated that in a large, well bounded, subgroup of patients with a single lesion (n=285, 41% of the HEAT Study patients),
treatment with a combination of ThermoDox<sup>&#174;</sup> and optimized RFA provided an average 54% risk improvement in OS compared to
optimized RFA alone. The HR at this analysis is 0.65 (95% CI 0.45 - 0.94) with a p-value of 0.02. Median OS for the ThermoDox<sup>&#174;
</sup>group has been reached which translates into a two-year survival benefit over the optimized RFA group (projected to be greater
than 80 months for the ThermoDox<sup>&#174;</sup> plus optimized RFA group compared to less than 60 months projection for the optimized
RFA only group). This information should be viewed with caution since it is based on a retrospective analysis of a subgroup.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">We
also conducted additional analyses that further strengthen the evidence for the HEAT Study subgroup.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 0.5in; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<table cellspacing="0" cellpadding="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#9679;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">We
    commissioned an independent computational model at the University of South Carolina Medical School. The results unequivocally indicate
    that longer RFA heating times correlate with significant increases in doxorubicin concentration around the RFA treated tissue.</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#9679;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">In
    addition, we conducted a prospective preclinical study in 22 pigs using two different manufacturers of RFA and human equivalent doses
    of ThermoDox<sup>&#174;</sup> that clearly support the relationship between increased heating duration and doxorubicin concentrations.</span></td></tr>
  </table>
<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">On
August 13, 2019, the Company announced that results from an independent analysis of the Company&#8217;s ThermoDox<i><sup>&#174; </sup></i>HEAT
Study conducted by the National Institutes of Health (NIH) were published in the peer-reviewed publication, <i>Journal of Vascular and
Interventional Radiology</i>. The analysis was conducted by the intramural research program of the NIH and the NIH Center for Interventional
Oncology, with the full data set from the Company&#8217;s HEAT Study. The analysis evaluated the full data set to determine if there
was a correlation between baseline tumor volume and RFA heating time (minutes/tumor volume in milliliters), with or without ThermoDox<sup>&#174;
</sup>treatment, for patients with HCC. The NIH analysis was conducted under the direction of Dr. Bradford Wood, MD, Director, NIH Center
for Interventional Oncology and Chief, NIH Clinical Center Interventional Radiology.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">The
article titled, &#8220;<i>RFA Duration Per Tumor Volume May Correlate with Overall Survival in Solitary Hepatocellular Carcinoma Patients
Treated with RFA Plus Lyso-thermosensitive Liposomal Doxorubicin</i>,&#8221; discussed the NIH analysis of results from 437 patients
in the HEAT Study (all patients with a single lesion representing 62.4% of the study population). The key finding was that increased
RFA heating time per tumor volume significantly improved OS in patients with single-lesion HCC who were treated with RFA plus ThermoDox<sup>&#174;</sup>,
compared to patients treated with RFA alone. A one-unit increase in RFA duration per tumor volume was shown to result in about a 20%
improvement in OS for patients administered ThermoDox<sup>&#174;</sup>, compared to RFA alone. The authors conclude that increasing RFA
heating time in combination with ThermoDox<sup>&#174;</sup> significantly improves OS and establishes an improvement of over two years
versus the control arm when the heating time per milliliter of tumor is greater than 2.5 minutes. This finding was consistent with the
Company&#8217;s own results, which defined the optimized RFA procedure as a 45-minute treatment for tumors with a diameter of 3 centimeters.
Thus, the NIH analysis lent support to the hypothesis underpinning the OPTIMA Study.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">In
August 2018, the Company announced that the OPTIMA Study was fully enrolled. On August 5, 2019, the Company announced that the prescribed
number of OS events had been reached for the first prespecified interim analysis of the OPTIMA Phase III Study. Following preparation
of the data, the first interim analysis was conducted by the DMC. The DMC&#8217;s pre-planned interim efficacy review followed 128 patient
events, or deaths, which occurred in August 2019. On November 4, 2019, the Company announced that the DMC unanimously recommended the
OPTIMA Study continue according to protocol. The recommendation was based on a review of blinded safety and data integrity from 556 patients
enrolled in the OPTIMA Study. Data presented demonstrated that PFS and OS data appeared to be tracking with patient data observed at
a similar point in the Company&#8217;s subgroup of patients followed prospectively in the earlier Phase III HEAT Study, upon which the
OPTIMA Study was based.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">On
April 15, 2020, the Company announced that the prescribed minimum number of events of 158 patient deaths had been reached for the second
pre-specified interim analysis of the OPTIMA Phase III Study. The hazard ratio for success at 158 deaths is 0.70, which represents a
30% reduction in the risk of death compared with RFA alone. On July 13, 2020, the Company announced that it has received a recommendation
from the DMC to consider stopping the global OPTIMA Study. The recommendation was made following the second pre-planned interim safety
and efficacy analysis by the DMC on July 9, 2020. The DMC analysis found that the pre-specified boundary for stopping the trial for futility
of 0.900 was crossed with an actual value of 0.903. However, the 2-sided p-value of 0.524 for this analysis provides uncertainty, subsequently,
the DMC left the final decision of whether or not to stop the OPTIMA Study to Celsion. There were no safety concerns noted during the
interim analysis. The Company followed the advice of the DMC considered its options either to stop the study or continue to follow patients
after a thorough review of the data, and an evaluation of our probability of success.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>


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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">On
August 4, 2020, the Company issued a press release announcing it would continue following patients for OS, noting that the unexpected
and marginally crossed futility boundary, suggested by the Kaplan-Meier analysis at the second interim analysis on July 9, 2020, may
be associated with a data maturity issue. On October 12, 2020, the Company provided an update on the ongoing data analysis from its Phase
III OPTIMA Study with ThermoDox<sup>&#174;</sup> as well as growing interest among clinical investigators in conducting studies with ThermoDox<sup>&#174;
</sup>as a monotherapy or in combination with other therapies.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 0.5in; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<table cellspacing="0" cellpadding="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify; width: 0.25in"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify; width: 0.25in"><span style="font: 10pt Times New Roman, Times, Serif">&#9679;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Celsion
    engaged a global biometrics contract research organization, with forensic statistical analysis capability that specializes in data
    management, statistical consulting, statistical analysis and data sciences, with particular expertise in evaluating unusual data
    from clinical trials and experience with associated regulatory issues. The primary objective of the CRO&#8217;s work was to determine
    the basis and reasoning behind continuing to follow patients for survival, and if there were outside influences that may have impacted
    the forecast of futility.</span></td></tr>
  </table>
<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<table cellspacing="0" cellpadding="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify; width: 0.25in"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify; width: 0.25in"><span style="font: 10pt Times New Roman, Times, Serif">&#9679;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">In
    parallel, the Company submitted all OPTIMA Study clinical trial data to the National Institutes of Health (NIH) and with the expectation
    of receiving a report on the following:</span></td></tr>
  </table>
<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif"></span></p>

<table cellspacing="0" cellpadding="0" style="font: 11pt Calibri, Helvetica, Sans-Serif; width: 100%; border-collapse: collapse">
  <tr style="vertical-align: top">
    <td style="width: 24px; text-align: justify">&#160;</td>
    <td style="width: 24px; text-align: justify">&#160;</td>
    <td style="width: 24px">&#160;</td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 24px; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#9675;</span></td>
    <td style="text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">A Cox Regression Analysis for single solitary lesions including minimum burn time per tumor volume, evaluating similarities to the hypothesis generated from the NIH paper published in the <i>Journal of Vascular and Interventional Radiology</i>, in which the key finding was that increased RFA heating time per tumor volume significantly improved OS in patients with single lesion HCC who were treated with RFA plus ThermoDox<sup>&#174;</sup>, compared with patients treated with RFA alone.</span></td></tr>
  <tr style="vertical-align: top">
    <td style="text-align: justify">&#160;</td>
    <td style="text-align: justify">&#160;</td>
    <td>&#160;</td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#9675;</span></td>
    <td style="text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">A site-by-site evaluation for RFA heating time-based anomalies that may have contributed to the treatment arm performance.</span></td></tr>
  <tr style="vertical-align: top">
    <td style="text-align: justify">&#160;</td>
    <td style="text-align: justify">&#160;</td>
    <td>&#160;</td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#9675;</span></td>
    <td style="text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">An image-based evaluation comparing results from the OPTIMA Study to the data from the HEAT Study that led to the RFA heating time hypothesis.</span></td></tr>
  </table>
<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span>&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">On
February 11, 2021, the Company provided a final update on the Phase III OPTIMA Study and the decision to stop following patients in the
Study. Independent analyses conducted by a global biometrics contract research organization and the NIH, did not find any evidence of
significance or factors that would justify continuing to follow patients for OS. Therefore, the Company notified all clinical sites to
discontinue following patients. The OPTIMA Study database of 556 patients will now be frozen at 185 patient deaths. While the analyses
did identify certain patient subgroups that appear to have had a clinical benefit, the Company concluded that it would not be in its
best interest to pursue these retrospective findings as the regulatory hurdles supporting further discussion will be significant.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><b>Investigator-Sponsored
Studies with ThermoDox<sup>&#174;</sup></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Celsion
continues working closely and supporting investigations by others throughout the world in breast cancer, pancreatic cancer and in solid
tumors in children. Following inquiries from the NIH, we intend to renew our Cooperative Research and Development Agreement (CRADA) with
the Institute at a nominal cost, one goal of which is to pursue their interest in a study of ThermoDox<sup>&#174; </sup>to treat patients
with bladder cancer. Importantly, Celsion is developing a business model to support these investigator-sponsored studies in a manner
that will not interfere with the Company&#8217;s focus on our GEN-1 program and vaccine development initiative.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Below
are summaries of several investigator-sponsored studies using ThermoDox&#174;:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<table cellspacing="0" cellpadding="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#9679;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Oxford
    University commenced enrolling patients in a Phase I pancreatic cancer study with ThermoDox<sup>&#174;</sup> in combination
    with High Intensity Focused Ultrasound (HIFU) in July of 2021. The primary objective of this trial, the <i>PanDox Study: Targeted
    Doxorubicin in Pancreatic Tumors</i>, is to quantify the enhancement in intratumoral doxorubicin concentration when delivered with
    ThermoDox<sup>&#174;</sup> and HIFU, versus doxorubicin monotherapy. This study is being undertaken pursuant to promising data in
    a mouse model of pancreatic cancer, which was published in the <i>International Journal of Hyperthermia </i>in 2018. That preclinical
    study showed a 23x increase in intratumoral doxorubicin concentration with ThermoDox<sup>&#174; </sup>+ HIFU, compared with a 2x increase
    in intratumoral doxorubicin concentration with free doxorubicin plus HIFU.</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#9679;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Utrecht
    University in the Netherlands continues to enroll patients in a Phase I breast cancer study to determine the safety, tolerability
    and feasibility of ThermoDox<sup>&#174;</sup> in combination with Magnetic Resonance Guided High Intensity Focused Ultrasound (MR-HIFU)
    hyperthermia and cyclophosphamide therapy for the local treatment of the primary tumor in metastatic breast cancer (mBC). This investigator-sponsored
    study, which is being funded by the Dutch Cancer Society, the Center for Translational Molecular Medicine (a public-private partnership
    in the Netherlands), will be conducted at University Medical Center Utrecht and will enroll up to 12 newly diagnosed mBC patients.
    Celsion will supply Thermodox<sup>&#174;</sup> clinical product for the trial.</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#9679;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">As
    evidence of the ongoing support Celsion enjoys from the NIH, they have organized a clinical project to evaluate ThermoDox<sup>&#174;
    </sup>plus the chemotherapy drug mitomycin in bladder cancer. Depending on the NIH timelines, this study may commence as early as
    2021.</span></td></tr>
  </table>
<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>


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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><b><i>Business
Plan</i></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Since
inception, the Company has incurred substantial operating losses, principally from expenses associated with the Company&#8217;s research
and development programs, clinical trials conducted in connection with the Company&#8217;s product candidates, and applications and submissions
to the U.S. Food and Drug Administration. The Company has not generated significant revenue and has incurred significant net losses in
each year since our inception. As of June 30, 2021, the Company has incurred approximately $323 million of cumulative net
losses and we had approximately $64.5 million in cash and cash equivalents, restricted cash, short-term investments, and
receivable on sale of net operating losses. We have substantial future capital requirements to continue our research and development
activities and advance our product candidates through various development stages. The Company believes these expenditures are essential
for the commercialization of its technologies.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">The
Company expects its operating losses to continue for the foreseeable future as it continues its product development efforts, and when
it undertakes marketing and sales activities. The Company&#8217;s ability to achieve profitability is dependent upon its ability to obtain
governmental approvals, manufacture, and market and sell its product candidates. There can be no assurance that the Company will be able
to commercialize its technology successfully or that profitability will ever be achieved. The operating results of the Company have fluctuated
significantly in the past.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">In
January 2020, the WHO declared an outbreak of coronavirus, COVID-19, to be a &#8220;Public Health Emergency of International Concern,&#8221;
and the U.S. Department of Health and Human Services declared a public health emergency to aid the U.S. healthcare community in responding
to COVID-19. This virus has spread to over 100 countries, including the U.S. Governments and businesses around the world undertook
unprecedented actions to mitigate the spread of COVID-19, including, but not limited to, shelter-in-place orders, quarantines, significant
restrictions on travel, as well as restrictions that has prohibited many employees from going to work. Uncertainty with respect
to the economic impacts of the pandemic introduced significant volatility in the financial markets. The Company did not observe significant
impacts on its business or results of operations during 2020 and thus far in 2021 due to COVID-19. While the extent to which COVID-19
impacts the Company&#8217;s future results will depend on future developments, the pandemic and associated economic impacts could result
in a material impact to the Company&#8217;s future financial condition, results of operations and cash flows.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">The
Company&#8217;s ability to raise additional capital may be adversely impacted by potential worsening global economic conditions and the
recent disruptions to, and volatility in, financial markets in the U.S. and worldwide resulting from the ongoing COVID-19 pandemic. The
disruptions caused by COVID-19 may also disrupt the clinical trials process and enrolment of patients. This may delay commercialization
efforts. The Company continues to monitor its operating activities in light of these events. The specific impact, if any, is not readily
determinable as of the date of these financial statements.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">The
actual amount of funds the Company will need to operate is subject to many factors, some of which are beyond the Company&#8217;s control.
These factors include the following:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<table cellspacing="0" cellpadding="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; width: 0.5in; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#9679;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">the
    progress of research activities;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#9679;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">the
    number and scope of research programs;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#9679;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">the
    progress of preclinical and clinical development activities;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#9679;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">the
    progress of the development efforts of parties with whom the Company has entered into research and development agreements;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#9679;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">the
    costs associated with additional clinical trials of product candidates;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#9679;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">the
    ability to maintain current research and development licensing arrangements and to establish new research and development and licensing
    arrangements;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#9679;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">the
    ability to achieve milestones under licensing arrangements;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#9679;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">the
    costs involved in prosecuting and enforcing patent claims and other intellectual property rights; and</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#9679;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">the
    costs and timing of regulatory approvals.</span></td></tr>
  </table>
<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>


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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif">On
July 13, 2020As discussed earlier in this Quarterly Report on Form 10Q, the Company announced that it has received a recommendation
from the independent DMC to consider stopping the global Phase III OPTIMA Study of ThermoDox<sup>&#174; </sup>in combination with RFA
for the treatment of HCC, or primary liver cancer on July 13, 2020. On February 11, 2021, the Company issued a letter to shareholders
stating that the Company was notifying all clinical sites to discontinue following patients in the OPTIMA Study.</span></p>
<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"></p><p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">During
2020, 2019 and 2018, the Company submitted applications to sell a portion of the Company&#8217;s State of New Jersey net operating losses
as part of the Technology Business Tax Certificate Program sponsored by The New Jersey Economic Development Authority. Under the program,
emerging biotechnology companies with unused NOLs and unused research and development credits are allowed to sell these benefits to other
New Jersey-based companies. In 2018 and 2019, the Company sold NOLs totaling $13 million receiving net proceeds of $12.2 million. In
June 2020 and as updated in September 2020, the Company filed an application with the New Jersey Economic Development Authority to sell
substantially all of its remaining State of New Jersey net operating losses totaling $2.0 million available under the program. On February
12, 2021, the New Jersey Economic Development Authority approved the full amount of the Company&#8217;s application. In February of 2021,
the Company entered into an agreement to sell the net operating losses from the 2020 application and the Company received net proceeds
of approximately $1.85 million on May 10, 2021. During 2021, the New Jersey State Legislature increased the maximum lifetime benefit
per company from $15 million to $20 million, which will allow the Company to participate in this innovative funding program in future
years (see additional disclosure on next page).</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>


<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif">In
June 2018, the Company entered into a Credit Agreement with Horizon Technology Finance Corporation (&#8220;Horizon&#8221;) that provided
$10 million in capital (the &#8220;Horizon Credit Agreement&#8221;). The obligations under the Horizon Credit Agreement are secured by
a first-priority security interest in substantially all assets of Celsion other than intellectual property assets. Payments under the
loan agreement are interest only (calculated based on one-month LIBOR plus 7.625%) for the first 24 months through July 2020, followed
by a 21-month amortization period of principal and interest starting on August 1, 2020 and ending through the scheduled maturity date
on April 1, 2023. On August 28, 2020, in connection with an Amendment to the Horizon Credit Agreement, Celsion repaid $5 million of the
$10 million loan and $0.2 million in related end of term charges, and the remaining $5 million in obligations were restructured as more
fully discussed in Note 11 to the financial statements As more fully discussed in Note 11, in June 2021, the Company <span style="background-color: white">entered
into a </span>$10 million <span style="background-color: white">loan facility with </span>Silicon Valley Bank<span style="background-color: white">.
</span>The Company <span style="background-color: white">immediately used </span>$6 million <span style="background-color: white">from
this facility to retire all outstanding indebtedness with Horizon Technology Finance Corporation. The remaining </span>$4 million <span style="background-color: white">will
be available to be drawn down up to 12 months after closing and will be used for working capital and to fund the advancement of the Company&#8217;s
product pipelines. The funding is in the form of money market secured indebtedness bearing interest at a calculated WSJ Prime-based variable
rate (currently 3.25%).</span></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; background-color: white">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif; background-color: white">&#160;Payments
under the loan agreement are interest only for the first 24 months after loan closing, followed by a 24-month amortization period of
principal and interest through the scheduled maturity date.</span></p>
<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"></p><p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>



<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif">As
more fully discussed in Note 12, during 2021 through the date of the filing of this Quarterly Report on Form 10-Q, the Company raised
approximately $6.9 million in gross proceeds from the use of its JonesTrading Capital on Demand<sup>TM</sup> financing facility, $35
million from a registered direct financing completed in January 2021, $15 million from a registered direct financing completed in
April 2021, and $1.5 million from warrant exercises. With $64.5 million in cash and cash equivalents, restricted cash,
short-term investments and interest receivable at June 30, 2021, the Company believes it has sufficient capital resources
to fund its operations through the end of 2024.</span></p>
<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"></p><p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">The
Company has based its estimates on assumptions that may prove to be wrong. The Company may need to obtain additional funds sooner or
in greater amounts than it currently anticipates. Potential sources of financing include strategic relationships, public or private sales
of the Company&#8217;s shares or debt, the sale of the Company&#8217;s State of New Jersey net operating losses and other sources. If
the Company raises funds by selling additional shares of common stock or other securities convertible into common stock, the ownership
interest of existing stockholders may be diluted.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><b><i>Financing
Overview</i></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><i><span style="text-decoration: underline">Equity,
Debt and Other Forms of Financing</span></i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">During
2020, 2019 and 2018, the Company submitted applications to sell a portion of the Company&#8217;s State of New Jersey net operating losses
as part of the Technology Business Tax Certificate Program sponsored by The New Jersey Economic Development Authority. Under the program,
emerging biotechnology companies with unused NOLs and unused research and development credits are allowed to sell these benefits to other
New Jersey-based companies. In 2018 and 2019, the Company sold NOLs totaling $13 million receiving net proceeds of $12.2 million. In
June 2020 and as updated in September 2020, the Company filed an application with the New Jersey Economic Development Authority to sell
substantially all of its remaining State of New Jersey net operating losses totaling $2.0 million available under the program. On February
12, 2021, the New Jersey Economic Development Authority approved the full amount of the Company&#8217;s application. In February of 2021,
the Company entered into an agreement to sell the net operating losses from the 2020 application and the Company received net proceeds
of approximately $1.85 million on May 10, 2021. During 2021, the New Jersey State Legislature increased the maximum lifetime benefit
per company from $15 million to $20 million, which will allow the Company to participate in this innovative funding program in future
years. On June 16, 2021, the Company filed another application to sell approximately $1.6 million of net operating losses during
2021 and expects to receive up to approximately $1.4 million under the current year program.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>


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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif">As
previously discussed, the Company entered into a Credit Agreement with Horizon Technology Finance Corporation (&#8220;Horizon&#8221;)
that provided $10 million in capital (the &#8220;Horizon Credit Agreement&#8221;) in June 2018. In August, 2020, in connection with an
Amendment to the Horizon Credit Agreement, Celsion repaid $5 million of the $10 million loan and $0.2 million in related end of term
charges, and the remaining $5 million in obligations were restructured</span><span style="font-family: Times New Roman, Times, Serif">.
In June 2021, the Company <span style="background-color: white">entered into a </span>$10 million <span style="background-color: white">loan
facility with </span>Silicon Valley Bank<span style="background-color: white">. </span>The Company <span style="background-color: white">immediately
used </span>$6 million <span style="background-color: white">from this facility to retire all outstanding indebtedness with Horizon Technology
Finance Corporation. The remaining </span>$4 million <span style="background-color: white">will be available to be drawn down up to 12
months after closing. Payments under the loan agreement are interest only for the first 24 months after loan closing, followed by a 24-month
amortization period of principal and interest through the scheduled maturity date.</span></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif">In
September 2018, the Company filed with the SEC a $75 million shelf registration statement on Form S-3 (the 2018 Shelf Registration Statement)
that allows the Company to issue any combination of common stock, preferred stock or warrants to purchase common stock or preferred stock.
This shelf registration was declared effective on October 12, 2018 and was fully utilized by the end of January 2021.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif">On
March 19, 2021, the Company filed with the SEC a new $100 million shelf registration statement on Form S-3 (File No. 333-254515)
(the &#8220;2021 Registration Statement&#8221;) that allows the Company to issue any combination of common stock, preferred stock or
warrants to purchase common stock or preferred stock. This shelf registration was declared effective on March 30, 2021.</span></p>
<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">During
2020 and 2021 through the date of this Quarterly Report filed on Form 10-Q, we issued a total of 62.5 million shares of common stock
as discussed below for an aggregate $83.2 million in gross proceeds.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<table cellspacing="0" cellpadding="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#9679;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">On
    December 4, 2018, the Company entered into the Capital on Demand Agreement with JonesTrading, pursuant to which the Company may offer
    and sell, from time to time, through JonesTrading shares of Common Stock having an aggregate offering price of up to $16.0 million.
    During 2019, the Company sold and issued an aggregate of 0.5 million shares under the Capital on Demand Agreement, receiving approximately
    $1.0 million in gross proceeds. During 2020, the Company sold and issued an aggregate of 5.2 million shares under the Capital on
    Demand Agreement, receiving approximately $6.2 million in gross proceeds. During 2021 through the date of this Quarterly Report on
    Form 10-Q, the Company sold 7.2 million shares under the Capital on Demand Agreement, receiving approximately $6.9 million in gross
    proceeds under the Capital on Demand Agreement.</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#9679;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">On
    February 27, 2020, we entered into a Securities Purchase Agreement (the &#8220;February 2020 Purchase Agreement&#8221;) with several
    institutional investors, pursuant to which we agreed to issue and sell, in a registered direct offering (the &#8220;February 2020
    Offering&#8221;), an aggregate of 4,571,428 shares of our common stock at an offering price of $1.05 per share for gross proceeds
    of approximately $4.8 million before the deduction of the Placement Agent fees and offering expenses. In a concurrent private placement
    (the &#8220;Private Placement&#8221;), the Company issued to the investors that participated in the February 2020 Offering, for no
    additional consideration, warrants, to purchase up to 2,971,428 shares of common stock (the &#8220;Original Warrants&#8221;). The
    Original Warrants were initially exercisable six months following their date of issue and were set to expire on the five-year anniversary
    of such initial exercise date. The Original Warrants had an exercise price of $1.15 per share subject to adjustment as provided therein.
    On March 12, 2020, the Company entered into private exchange agreements (the &#8220;Exchange Agreements&#8221;) with holders of the
    Original Warrants. Pursuant to the Exchange Agreements, in return for a higher exercise price of $1.24 per share of common stock,
    the Company issued new warrants to the Investors to purchase up to 3,200,000 shares of common stock (the &#8220;Exchange Warrants&#8221;)
    in exchange for the Original Warrants. The Exchange Warrants, like the Original Warrants, are initially exercisable six months following
    their issuance (the &#8220;Initial Exercise Date&#8221;) and expire on the five-year anniversary of their Initial Exercise Date.
    Other than having a higher exercise price, different issue date, Initial Exercise Date and expiration date, the terms of the Exchange
    Warrants are identical to those of the Original Warrants. On July 31, 2020, the Company filed a Form S-3 Registration Statement to
    register the shares of common stock issuable under the Exchange Warrants; the Registration Statement was declared effective by the
    SEC on August 13, 2020. No Exchange Warrants were exercised during 2020. During 2021 through the date of this Quarterly Report on
    Form 10-Q, the Company issued 1.2 million shares pursuant to investors exercising Exchange Warrants, receiving approximately $1.5
    million.</span></td></tr>
  </table>
<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>


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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<table cellspacing="0" cellpadding="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#9679;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">On
    June 22, 2020, the Company entered into an underwriting agreement (the &#8220;Underwriting Agreement&#8221;) with Oppenheimer &amp;
    Co. Inc. (the &#8220;Underwriter&#8221;), relating to the issuance and sale (the &#8220;Underwritten Offering&#8221;) of 2,666,667
    shares of the Company&#8217;s common stock. Pursuant to the terms of the Underwriting Agreement, the Underwriter agreed to purchase
    the shares at a price of $3.4875 per share. The Underwriter offered the shares at a public offering price of $3.75 per share, reflecting
    an underwriting discount equal to $0.2625, or 7.0% of the public offering price. The net proceeds to the Company from the Underwritten
    Offering, after deducting the underwriting discount and estimated offering expenses payable by the Company, were approximately $9.1
    million.</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
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    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#9679;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">On
    September 8, 2020, the Company entered into a purchase agreement (the &#8220;LPC Purchase Agreement&#8221;) and a Registration Rights
    Agreement (the &#8220;Registration Rights Agreement&#8221;) with Lincoln Park Capital Fund, LLC (&#8220;Lincoln Park&#8221;), pursuant
    to which, upon the terms and subject to the conditions and limitations set forth therein, the Company has the right to sell to Lincoln
    Park up to $26.0 million of shares of the Company&#8217;s Common Stock at the Company&#8217;s discretion as described below (the
    &#8220;LPC Offering&#8221;). During 2020, the Company sold and issued an aggregate of 3.3 million shares, including the LPC Commitment
    Shares, under the LPC Purchase Agreement, receiving approximately $2.2 million in gross proceeds. The Company sent a letter to Lincoln
    Park terminating the LPC Offering effective January 21, 2021. The Company did not sell any shares under the LPC Purchase Agreement
    in 2021.</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#9679;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">On
    January 22, 2021, the Company entered into a Securities Purchase Agreement (the &#8220;January 2021 Purchase Agreement&#8221;) with
    several institutional investors, pursuant to which the Company agreed to issue and sell, in a registered direct offering (the &#8220;January
    2021 Offering&#8221;), an aggregate of 25,925,925 shares of the Company&#8217;s common stock at an offering price of $1.35 per share
    for gross proceeds of approximately $35 million before the deduction of the January 2021 Placement Agents (as defined below) fee
    and offering expenses. The closing of the January 2021 Offering occurred on January 26, 2021. In connection with the January 2021
    Offering, the Company entered into a placement agent agreement (the &#8220;January 2021 Placement Agent Agreement&#8221;) with A.G.P./Alliance
    Global Partners (together with Brookline Capital Markets, the &#8220;January 2021 Placement Agents&#8221;) pursuant to which the
    Company agreed to pay the January 2021 Placement Agents a cash fee equal to 7% of the aggregate gross proceeds raised from the sale
    of the securities sold in the January 2021 Offering and reimburse the January 2021 Placement Agents for certain of their expenses
    in an amount not to exceed $82,500. </span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#9679;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">On
    March 31, 2021, the Company entered into a Securities Purchase Agreement (the &#8220;March 2021 Purchase Agreement&#8221;) with several
    institutional investors, pursuant to which the Company agreed to issue and sell, in a registered direct offering (the &#8220;March
    2021 Offering&#8221;), an aggregate of 11,538,462 shares of the Company&#8217;s common stock, at an offering price of $1.30 per share
    for gross proceeds of approximately $15 million before the deduction of the placement agents fee and offering expenses. The shares
    were offered by the Company pursuant to the 2021 Registration Statement. The March 2021 Purchase Agreement contains customary representations,
    warranties and agreements by the Company and customary conditions to closing. The closing of the Offering occurred on April 5, 2021.
    The Company will account for the March 31, 2021 Offering in the second quarter of 2021. In connection with the March 2021 Offering,
    the Company entered into a placement agent agreement (the &#8220;March 2021 Placement Agent Agreement&#8221;) with A.G.P./Alliance
    Global Partners, as lead placement agent (&#8220;AGP,&#8221; and together with JonesTrading Institutional Services LLC and Brookline
    Capital Markets, a division of Arcadia Securities, LLC, serving as co-placement agents, the &#8220;March 2021 Placement Agents&#8221;)
    pursuant to which the Company agreed to pay the March 2021 Placement Agents an aggregate cash fee equal to 7% of the aggregate gross
    proceeds raised from the sale of the securities sold in the Offering and reimburse the Placement Agents for certain of their expenses
    in an amount not to exceed $82,500.</span></td></tr>
  </table>
<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><b>Significant
Accounting Policies</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Our
significant accounting policies are more fully described in Note 1 to our consolidated financial statements included in our 2020 Annual
Report on Form 10-K for the year ended December 31, 2020 filed with the SEC on March 19, 2021. See Note 5 to the Condensed Consolidated
Financial Statements contained in this Quarterly Report on Form 10-Q.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>


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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">As
a clinical stage biopharmaceutical company, our business, and our ability to execute our strategy to achieve our corporate goals
are subject to numerous risks and uncertainties. Material risks and uncertainties relating to our business and our industry are described
in &#8220;Item 1A. Risk Factors&#8221; under &#8220;Part II: Other Information&#8221; included herein.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><b>FINANCIAL
REVIEW FOR THE THREE AND SIX MONTHS ENDED JUNE 30, 2021 AND 2020</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><b>Results
of Operations</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">For
the three months ended June 30, 2021 our net loss was $5.4 million compared to a net loss of $5.3 million for the same three-month
period of 2020. For the six months ended June 30, 2021 our net loss was $11.1 million compared to a net loss of $10.4 million for the
same three-month period of 2020.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">With
$64.5 million in cash and cash equivalents, short-term investments, interest receivable and restricted cash, at June 30, 2021,
coupled with approximately $15 million of potential future sales of the Company&#8217;s State of New Jersey net operating
losses, the Company believes it has sufficient capital resources to fund its operations through 2024.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="vertical-align: bottom">
    <td style="font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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    Months Ended June 30,</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom">
    <td style="font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="6" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">(In
    thousands)</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="6" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">Change
    Increase (Decrease)</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom">
    <td style="font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">2021</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">%</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="width: 40%; font-weight: bold; text-align: left; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">Licensing
    Revenue:</span></td><td style="width: 2%; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td style="border-bottom: Black 1.5pt solid; width: 11%; text-align: right"><span style="font-family: Times New Roman, Times, Serif">125</span></td><td style="width: 1%; padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="width: 2%; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td style="border-bottom: Black 1.5pt solid; width: 11%; text-align: right"><span style="font-family: Times New Roman, Times, Serif">125</span></td><td style="width: 1%; padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="width: 2%; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td style="border-bottom: Black 1.5pt solid; width: 11%; text-align: right"><span style="font-family: Times New Roman, Times, Serif">-</span></td><td style="width: 1%; padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="width: 2%; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="padding-bottom: 1.5pt; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt; width: 11%; text-align: right"><span style="font-family: Times New Roman, Times, Serif">-</span></td><td style="width: 1%; padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">%</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">Operating Expenses:</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td style="padding-left: 10pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">Clinical Research</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
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    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif">(127</span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">)</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt; text-align: right"><span style="font-family: Times New Roman, Times, Serif">(8.4</span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">)%</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
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    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">(398</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">)</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="padding-left: 10pt; text-align: left; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">General
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    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif">2,603</span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif">702</span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt; text-align: right"><span style="font-family: Times New Roman, Times, Serif">36.9</span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">%</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td style="padding-left: 20pt; text-align: left; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">Total
    operating expenses</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif">5,196</span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif">4,892</span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif">304</span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt; text-align: right"><span style="font-family: Times New Roman, Times, Serif">6.2</span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">%</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font-weight: bold; text-align: left; padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">Loss
    from operations</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td style="border-bottom: Black 2.5pt double; text-align: right"><span style="font-family: Times New Roman, Times, Serif">(5,071</span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">)</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td style="border-bottom: Black 2.5pt double; text-align: right"><span style="font-family: Times New Roman, Times, Serif">(4,767</span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">)</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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  </table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="vertical-align: bottom">
    <td style="font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="14" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">Six
    Months Ended June 30,</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom">
    <td style="font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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    thousands)</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="6" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">Change
    Increase (Decrease)</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom">
    <td style="font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">2021</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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    <td colspan="2" style="text-align: center"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="width: 40%; font-weight: bold; text-align: left; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">Licensing
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    <td style="border-bottom: Black 1.5pt solid; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td style="border-bottom: Black 1.5pt solid; width: 11%; text-align: right"><span style="font-family: Times New Roman, Times, Serif">250</span></td><td style="width: 1%; padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="width: 2%; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td style="border-bottom: Black 1.5pt solid; width: 11%; text-align: right"><span style="font-family: Times New Roman, Times, Serif">250</span></td><td style="width: 1%; padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="width: 2%; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td style="border-bottom: Black 1.5pt solid; width: 11%; text-align: right"><span style="font-family: Times New Roman, Times, Serif">-</span></td><td style="width: 1%; padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="width: 2%; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="padding-bottom: 1.5pt; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt; width: 11%; text-align: right"><span style="font-family: Times New Roman, Times, Serif">-</span></td><td style="width: 1%; padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">%</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">Operating Expenses:</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td style="padding-left: 10pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">Clinical Research</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="padding-left: 10pt; text-align: left; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">Chemistry,
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  <tr style="vertical-align: bottom; background-color: White">
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    expenses</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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  <tr style="vertical-align: bottom; background-color: White">
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    operating expenses</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font-weight: bold; text-align: left; padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">Loss
    from operations</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td style="border-bottom: Black 2.5pt double; text-align: right"><span style="font-family: Times New Roman, Times, Serif">(922</span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">)</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt; text-align: right"><span style="font-family: Times New Roman, Times, Serif">(9.7</span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">)%</span></td></tr>
  </table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><b><i>Comparison
of the Three Months Ended June 30, 2021 and 2020</i></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><i><span style="text-decoration: underline">Licensing
Revenue</span></i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">In
January 2013, we entered into a technology development contract with Hisun, pursuant to which Hisun paid us a non-refundable technology
transfer fee of $5.0 million to support our development of ThermoDox&#174; in the China territory. The $5.0 million received as a non-refundable
payment from Hisun in the first quarter 2013 has been recorded to deferred revenue and will be amortized over the ten-year term of the
agreement; therefore, we recorded deferred revenue of $125,000 in each of the second quarters of 2021 and 2020.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>


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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><i><span style="text-decoration: underline">Research
and Development Expenses</span></i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Research
and development (&#8220;R&amp;D&#8221;) expenses decreased by $0.4 million to $2.6 million in the second quarter of 2021 from $3.0 million
in the same period of 2020. Costs associated the OVATION 2 Study increased to $0.4 million in the second quarter of 2021 compared
to $0.2 million in the same period of 2020. The Company initiated enrollment in the Phase 2 portion of the study during the third quarter
of 2020. Costs associated with the OPTIMA Study decreased to $0.2 million in the second quarter of 2021 compared to $0.6 million
in the same period of 2020. In July 2020, the Company unblinded the OPTIMA Study at the recommendation of the DMC to halt the study due
to futility. Regulatory costs were $0.1 million in the second quarter of 2021 compared to $0.3 million in the same period of 2020. Other
clinical costs were $0.4 million the second quarter of 2021 compared to $0.5 million in the same period of 2020. R&amp;D costs associated
with the development of GEN-1 to support the OVATION 2 Study as well as development of the PLACCINE DNA vaccine technology platform increased
to $1.0 million in the second quarter of 2021 compared to $0.7 million in the same period of 2020. CMC costs decreased to $0.4 million
in the second quarter of 2021 compared to $0.8 million in the same period of 2020.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><i><span style="text-decoration: underline">General
and Administrative Expenses</span></i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">General
and administrative expenses increased to $2.6 million in the second quarter of 2021 compared to $1.9 million in the same period of 2020.
This increase is primarily attributable to higher non-cash stock compensation expense of approximately $0.1 million, an increase in professional
fees of $0.4 million and an increase in premiums for directors&#8217; and officers&#8217; insurance of $0.1 million in the second quarter
of 2021 when compared to the same period of 2020.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><i><span style="text-decoration: underline">Change
in Earn-out Milestone Liability and Warrant Expense</span></i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">On
March 28, 2019, the Company and EGWU, Inc, entered into an amendment to its purchase agreement (&#8220;Amended Asset Purchase Agreement&#8221;),
whereby payment of the earnout milestone liability related to the Ovarian Cancer Indication of $12.4 million had been modified. The Company
has the option to make the payment as follows:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<table cellspacing="0" cellpadding="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">a)</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">$7.0
    million in cash within 10 business days of achieving the milestone; or</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">b)</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">$12.4
    million in cash, common stock of the Company, or a combination of either, within one year of achieving the milestone.</span></td></tr>
  </table>
<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">As
of June 30, 2021, and March 31, 2021, the Company fair valued the earn-out milestone liability at $7.1 million and $7.1 million, respectively,
and recognized a non-cash benefit of $0.1 million for the three-months ended June 30, 2021. In assessing the earnout milestone liability
at June 30, 2021, the Company fair valued each of the two payment options per the Amended Asset Purchase Agreement and weighted them
at 50% / 50% probability for the $7.0 million and the $12.4 million payments, respectively.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">As
of June 30, 2020, and March 31, 2020, the Company fair valued the earn-out milestone liability at $6.1 million and $5.8 million, respectively,
and recognized a non-cash charge of $0.3 million for the three-months ended June 30, 2020. In assessing the earnout milestone liability
at June 30, 2020, the Company fair valued each of the two payment options per the Amended Asset Purchase Agreement and weighted them
at 80% / 20% probability for the $7.0 million and the $12.4 million payments, respectively.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><i><span style="text-decoration: underline">Investment
income and interest expense</span></i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Investment
income from its short-term investments was insignificant in each of the second quarters of 2021 and 2020.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">As
more fully discussed in Note 11, in June 2021, the Company entered into a $10 million loan facility with Silicon Valley Bank. The Company
immediately used $6 million from this facility to retire all outstanding indebtedness with Horizon Technology Finance Corporation. The
remaining $4 million will be available to be drawn down up to 12 months after closing and will be used for working capital and to fund
the advancement of the Company&#8217;s product pipelines. In connection with this Horizon Technology Financing Facility, the Company
incurred $0.2 million in interest expense in the second quarter of 2021 compared to $0.3 million during the same period of 2020. In connection
with the termination of the Horizon Technology Financing Facility in the second quarter of 2021, the Company paid early termination and
end of term charges to Horizon and recognized $0.2 million as a loss on debt extinguishment.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><b><i>Comparison
of the Six Months Ended June 30, 2021 and 2020</i></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><i><span style="text-decoration: underline">Licensing
Revenue</span></i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">In
January 2013, we entered a technology development contract with Hisun, pursuant to which Hisun paid us a non-refundable technology transfer
fee of $5.0 million to support our development of ThermoDox&#174; in the China territory. The $5.0 million received as a non-refundable
payment from Hisun in the second quarter 2013 has been recorded to deferred revenue and will be amortized over the ten-year term of the
agreement; therefore, we recorded deferred revenue of $250,000 in each of the first six months of 2021 and 2020.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>


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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><i><span style="text-decoration: underline">Research
and Development Expenses</span></i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">R&amp;D
expenses decreased by $0.9 million to $5.2 million in the first half of 2021 from $6.1 million in the same period of 2020. Costs associated
the OVATION 2 Study increased to $0.9 million in the first half of 2020 compared to $0.5 million in the same period of 2020. The Company
initiated enrollment in the Phase 2 portion of the study during the third quarter of 2020. Costs associated with the OPTIMA Study
decreased to $0.4 million in the first half of 2021 compared to $1.3 million in the same period of 2020. In July 2020, the Company unblinded
the OPTIMA Study at the recommendation of the DMC to halt the study due to futility. Regulatory costs were $0.2 million in the
first half of 2021 compared to $0.4 million in the same period of 2020. Regulatory costs were $0.2 million in the first half of
2021 compared to $0.4 million in the same period of 2020. Other clinical costs were $0.9 million the first half of 2021 compared to $1.1
million in the same period of 2020. R&amp;D costs associated with the development of GEN-1 to support the OVATION 2 Study as well as
development of the PLACCINE DNA vaccine technology platform increased to $2.0 million in the first half of 2021 compared to $1.6 million
in the same period of 2020. CMC costs decreased to $0.8 million in the first half of 2021 compared to $1.1 million in the same period
of 2020.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><i><span style="text-decoration: underline">General
and Administrative Expenses</span></i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">General
and administrative expenses increased to $5.5 million in the first half of 2021 compared to $3.7 million in the same period of 2020.
This increase is primarily attributable to higher non-cash stock compensation expense of approximately $0.8 million, an increase in professional
fees of $0.7 million and an increase in premiums for directors&#8217; and officers&#8217; insurance of $0.2 million in the first half
of 2021 when compared to the same period of 2020.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><i><span style="text-decoration: underline">Change
in Earn-out Milestone Liability and Warrant Expense</span></i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">On
March 28, 2019, the Company and EGWU, Inc, entered into an amendment to its purchase agreement (&#8220;Amended Asset Purchase Agreement&#8221;),
whereby payment of the earnout milestone liability related to the Ovarian Cancer Indication of $12.4 million had been modified. The Company
has the option to make the payment as follows:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<table cellspacing="0" cellpadding="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">a)</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">$7.0
    million in cash within 10 business days of achieving the milestone; or</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">b)</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">$12.4
    million in cash, common stock of the Company, or a combination of either, within one year of achieving the milestone.</span></td></tr>
  </table>
<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">As
of June 30, 2021, and December 31, 2020, the Company fair valued the earn-out milestone liability at $7.1 million and $7.0 million, respectively
and recognized a non-cash charge of $0.1 million during the first half of 2021. In assessing the earnout milestone liability at June
30, 2021, the Company fair valued each of the two payment options per the Amended Asset Purchase Agreement and weighted them at 50% /
50% probability for the $7.0 million and the $12.4 million payments, respectively.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">As
of June 30, 2020, and December 31, 2019, the Company fair valued the earn-out milestone liability at $6.0 million and $5.7 million, respectively
and recognized a non-cash charge of $0.3 million during the first half of 2020. In assessing the earnout milestone liability at June
30, 2020, the Company fair valued each of the two payment options per the Amended Asset Purchase Agreement and weighted them at 80% /
20% probability for the $7.0 million and the $12.4 million payments, respectively.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><i><span style="text-decoration: underline">Investment
income and interest expense</span></i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Investment
income from its short-term investments was insignificant in the first half of 2021. The Company realized $0.1 million of investment income
from its short-term investments during the first half of 2020.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">As
more fully discussed in Note 11, in June 2021, the Company entered into a $10 million loan facility with Silicon Valley Bank. The Company
immediately used $6 million from this facility to retire all outstanding indebtedness with Horizon Technology Finance Corporation. The
remaining $4 million will be available to be drawn down up to 12 months after closing and will be used for working capital and to fund
the advancement of the Company&#8217;s product pipelines. In connection with this Horizon Technology Financing Facility, the Company
incurred $0.4 million in interest expense in the first half of 2021 compared to $0.7 million during the same period of 2020. In connection
with the termination of the Horizon Technology Financing Facility in the second quarter of 2021, the Company paid early termination and
end of term charges to Horizon and recognized $0.2 million as a loss on debt extinguishment.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><b>Financial
Condition, Liquidity and Capital Resources</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Since
inception we have incurred significant losses and negative cash flows from operations. We have financed our operations primarily through
the net proceeds from the sales of equity, credit facilities and amounts received under our product licensing agreement with Yakult and
our technology development agreement with Hisun. The process of developing and commercializing ThermoDox<sup>&#174;</sup>, GEN-1 and other
product candidates and technologies requires significant research and development work and clinical trial studies, as well as significant
manufacturing and process development efforts. We expect these activities, together with our general and administrative expenses, to
result in significant operating losses for the foreseeable future. Our expenses have significantly and regularly exceeded our revenue,
and we had an accumulated deficit of $323 million at June 30, 2021.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">At
June 30, 2021, we had total current assets of $60.3 million and current liabilities of $5.4 million, resulting in net working capital
of $54.9 million. At June 30, 2021, we had cash and cash equivalents, short-term investments, interest receivable on short term investments
and money market investments ($6.0 million of which is included in other assets) of $64.5 million. At December 31, 2020, we had total
current assets of $18.8 million (including cash and cash equivalents of $17.2 million) and current liabilities of $6.8 million, resulting
in net working capital of $12.0 million. We have substantial future capital requirements to continue our research and development activities
and advance our product candidates through various development stages. The Company believes these expenditures are essential for the
commercialization of its technologies.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>


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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Net
cash used in operating activities for the first half of 2021 was $7.3 million. Net cash used in investing activities was $32.2 million
during the first half of 2021. Net cash provided by financing activities was $54.8 million during the first half of 2021 mostly from
net proceeds received through the sale of our common stock. With $64.5 million in cash and cash equivalents, short-term investments,
interest receivable on short term investments and money market investments at June 30, 2021 and with potential future sales of
the Company&#8217;s State of New Jersey net operating losses, the Company believes it has sufficient capital resources to fund its operations
through 2024.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">We
expect to seek additional capital through further public or private equity offerings, debt financing, additional strategic alliance and
licensing arrangements, collaborative arrangements, potential sales of our net operating losses, or some combination of these financing
alternatives. If we raise additional funds through the issuance of equity securities, the percentage ownership of our stockholders could
be significantly diluted, and the newly issued equity securities may have rights, preferences, or privileges senior to those of the holders
of our common stock. If we raise funds through the issuance of debt securities, those securities may have rights, preferences, and privileges
senior to those of our common stock. If we seek strategic alliances, licenses, or other alternative arrangements, such as arrangements
with collaborative partners or others, we may need to relinquish rights to certain of our existing or future technologies, product candidates,
or products we would otherwise seek to develop or commercialize on our own, or to license the rights to our technologies, product candidates,
or products on terms that are not favorable to us. The overall status of the economic climate could also result in the terms of any equity
offering, debt financing, or alliance, license, or other arrangement being even less favorable to us and our stockholders than if the
overall economic climate were stronger. We also will continue to look for government sponsored research collaborations and grants to
help offset future anticipated losses from operations and, to a lesser extent, interest income.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">If
adequate funds are not available through either the capital markets, strategic alliances, collaborators, or sales of our net operating
losses, we may be required to delay or, reduce the scope of, or terminate our research, development, clinical programs, manufacturing,
or commercialization efforts, or effect additional changes to our facilities or personnel, or obtain funds through other arrangements
that may require us to relinquish some of our assets or rights to certain of our existing or future technologies, product candidates,
or products on terms not favorable to us.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><b>Off-Balance
Sheet Arrangements and Contractual Obligations</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">None.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><b><span id="cr_010"></span>Item
3. QUANTITATIVE AND QUALITATIVE DISCLOSURE ABOUT MARKET RISK</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">The
primary objective of our investment activities is to preserve our capital until it is required to fund operations while at the same time
maximizing the income, we receive from our investments without significantly increasing risk. Our cash flow and earnings are subject
to fluctuations due to changes in interest rates in our investment portfolio. We maintain a portfolio of various issuers, types, and
maturities. These securities are classified as available-for-sale and, consequently, are recorded on the condensed consolidated balance
sheet at fair value with unrealized gains or losses reported as a component of accumulated other comprehensive loss included in stockholders&#8217;
equity.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><b><span id="cr_011"></span>Item
4. CONTROLS AND PROCEDURES</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">We
have carried out an evaluation, under the supervision and with the participation of management, including our principal executive officer
and principal financial officer, of the effectiveness of the design and operation of our disclosure controls and procedures, as that
term is defined in Rule 13a-15(e) under the Securities Exchange Act of 1934, as amended. Based on that evaluation, our principal executive
officer and principal financial officer have concluded that, as of June 30, 2021, which is the end of the period covered by this report,
our disclosure controls and procedures are effective at the reasonable assurance level in alerting them in a timely manner to material
information required to be included in our periodic reports with the SEC.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">There
were no changes in our internal control over financial reporting identified in connection with the evaluation that occurred during the
period covered by this report that have materially affected, or are reasonably likely to materially affect, our internal control over
financial reporting.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Our
management, including our chief executive officer and chief financial officer, does not expect that our disclosure controls and procedures
or our internal control over financial reporting will prevent all error and all fraud. A control system, no matter how well conceived
and operated, can provide only reasonable, not absolute, assurance that the objectives of the control system are met. Because of the
inherent limitations in all control systems, no evaluation of controls can provide absolute assurance that all control issues and instances
of fraud, if any, within the company have been detected. These inherent limitations include the realities that judgments in decision-making
can be faulty, and that breakdowns can occur because of simple errors or mistakes. Additionally, controls can be circumvented by the
individual acts of some persons, by collusion of two or more people or by management override of the control. The design of any system
of controls also is based in part upon certain assumptions about the likelihood of future events, and there can be no assurance that
any design will succeed in achieving its stated goals under all potential future conditions. Over time, controls may become inadequate
because of changes in conditions, or the degree of compliance with the policies or procedures may deteriorate. Because of the inherent
limitations in a cost-effective control system, misstatements due to error or fraud may occur and not be detected.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>


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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b><span id="cr_012"></span>PART
II: OTHER INFORMATION</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><b><span id="cr_013"></span>Item
1. Legal Proceedings</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">On
September 20, 2019, a purported stockholder of the Company filed a derivative and putative class action lawsuit against the Company and
certain officers and directors (the &#8220;Shareholder Action&#8221;). The Company was a defendant in this derivative and putative class
action lawsuit in the Superior Court of New Jersey, Chancery Division, filed by a shareholder against the Company (as both a class action
defendant and nominal defendant), and certain of its officers and directors (the &#8220;Individual Defendants&#8221;), with the caption
<i>O&#8217;Connor v. Braun et al., Docket No. MER-C-000068-19</i> (the &#8220;Shareholder Action&#8221;). The Shareholder Action alleged
breaches of the defendants&#8217; fiduciary duties based on allegations that the defendants omitted or made improper statements when
seeking shareholder approval of the 2018 Stock Incentive Plan. The Shareholder Action sought, among other things, any damages sustained
by the Company as a result of the defendants&#8217; alleged wrongdoing, a declaratory judgment against all defendants invalidating the
2018 Stock Incentive Plan and declaring any awards made under the Plan invalid, rescinded, and subject to disgorgement, an order disgorging
the equity awards granted to the Individual Defendants under the 2018 Stock Incentive Plan, and attorneys&#8217; fees and costs.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">On
April 24, 2020, the Company, the Individual Defendants, and the plaintiff (the &#8220;Parties&#8221;) entered into a Settlement Agreement
and Release (the &#8220;Settlement Agreement&#8221;), which memorializes the terms of the Parties&#8217; settlement of the Shareholder
Action (the &#8220;Settlement&#8221;). The Settlement calls for repricing of certain stock options and payment of plaintiff legal fees
of $187,500. On July 24, 2020, the Court issued an order approving the Parties&#8217; proposed form of notice to shareholders regarding
the Settlement. A hearing was held on September 8, 2020 whereby the Court issued a final approval approving the Settlement. Pursuant
to the Settlement, the Company paid $187,500 on October 1, 2020. Without admitting the validity of any of the claims asserted in the
Shareholder Action, or any liability with respect thereto, and expressly denying all allegations of wrongdoing, fault, liability, or
damage against the Company and the Individual Defendants arising out of any of the conduct, statements, acts or omissions alleged, or
that could have been alleged, in the Shareholder Action, the Company and the Individual Defendants concluded that it was desirable that
the claims be settled on the terms and subject to the conditions set forth in the Settlement Agreement. The Company and the Individual
Defendants entered into the Settlement Agreement for settlement purposes only and solely to avoid the cost and disruption of further
litigation.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">On
October 29, 2020, a putative securities class action was filed against the Company and certain of its officers and directors (the &#8220;Spar
Individual Defendants&#8221;) in the U.S. District Court for the District of New Jersey, captioned <i>Spar v. Celsion Corporation, et
al.</i>, Case No. 1:20-cv-15228. The plaintiff alleges that the Company and Individual Defendants made false and misleading statements
regarding one of the Company&#8217;s product candidates, ThermoDox<sup>&#174;</sup>, and brings claims for damages under Section 10(b)
of the Exchange Act and Rule 10b-5 promulgated thereunder against all Defendants, and under Section 20(a) of the Exchange Act of 1934
against the Spar Individual Defendants. The Company believes that the case is without merit and intends to defend it vigorously. Due
to the early stage of the case neither the likelihood that a loss, if any, will be realized, nor an estimate of possible loss or range
of loss, if any, can be determined.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">In
February 2021, a derivative shareholder lawsuit was filed against the Company, as the nominal defendant, and certain of its directors
and officers as defendants in the U.S. District Court for the District of New Jersey, captioned <i>Fidler v. Michael H. Tardugno et al.</i>,
Case No. 3:21-cv-02662. The plaintiff alleges breach of fiduciary duty and other claims arising out of alleged statements made by certain
of the Company&#8217;s directors and/or officers regarding ThermoDox<sup>&#174;.</sup> The Company believes it has meritorious defenses
to these claims and intends to vigorously contest this suit. Due to the early stage of the case neither the likelihood that a loss, if
any, will be realized, nor an estimate of possible loss or range of loss, if any, can be determined.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><b><span id="cr_014"></span>Item
1A. Risk Factors</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">There
have been no material changes to our risk factors from those disclosed under &#8220;Risk Factors&#8221; in Part I, Item 1A of our 2020
Annual Report on Form 10-K. The risks and uncertainties described in our 2020 Annual Report on Form 10-K are not the only ones we face.
Additional risks and uncertainties not presently known to us or that we currently deem immaterial may also materially adversely affect
our business, financial condition or results of operations.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><b><span id="cr_015"></span>Item
2. Unregistered Sales of Equity Securities and Use of Proceeds.</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 33pt"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">None</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><b><span id="cr_016"></span>Item
3. Defaults Upon Senior Securities.</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 33pt"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">None.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><b><span id="cr_017"></span>Item
4. Mine Safety Disclosures.</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 33pt"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Not
applicable.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><b><span id="cr_018"></span>Item
5. Other Information.</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 33pt"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">None.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>




<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><b><span id="cr_019"></span>Item
6. Exhibits.</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<table cellspacing="0" cellpadding="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify; width: 0.5in"><span style="font: 10pt Times New Roman, Times, Serif">31.1+</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify; width: 0.1in"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><a href="ex31-1.htm"><span style="font: 10pt Times New Roman, Times, Serif">Certification of Chief Executive Officer pursuant to Rule 13a-14(a)/15d-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.</span></a></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">31.2+</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><a href="ex31-2.htm"><span style="font-family: Times New Roman, Times, Serif">Certification of Chief Financial Officer pursuant to Rule 13a-14(a)/15d-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.</span></a></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">32.1*</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><a href="ex32-1.htm"><span style="font: 10pt Times New Roman, Times, Serif">Certification pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.</span></a></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">+</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Filed
    herewith.</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">101**</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">The
    following materials from the Company&#8217;s Quarterly Report on Form 10-Q for the quarter ended March 31, 2020 formatted in XBRL
    (Extensible Business Reporting Language): (i) the unaudited Consolidated Balance Sheets, (ii) the unaudited Consolidated Statements
    of Operations, (iii) the unaudited Consolidated Statements of Comprehensive Loss, (iv) the unaudited Consolidated Statements of Cash
    Flows, (v) the unaudited Consolidated Statements of Change in Stockholders&#8217; Equity (Deficit), and (vi) Notes to Consolidated
    Financial Statements.</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">*</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Exhibit
    32.1 is being furnished and shall not be deemed to be &#8220;filed&#8221; for purposes of Section 18 of the Securities Exchange Act
    of 1934, as amended, or otherwise subject to the liability of that section, nor shall such exhibit be deemed to be incorporated by
    reference in any registration statement or other document filed under the Securities Act of 1933, as amended, or the Securities Exchange
    Act, except as otherwise stated in such filing.</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">**</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">XBRL
    information is filed herewith.</span></td></tr>
  </table>
<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>


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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b><span id="cr_020"></span>SIGNATURES</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Pursuant
to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by
the undersigned thereunto duly authorized.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<table cellspacing="0" cellpadding="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">August
    12, 2021</span></td>
    <td colspan="2" style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">CELSION
    CORPORATION</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Registrant</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; width: 50%; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 3%; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 47%; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">By:</span></td>
    <td style="border-bottom: black 1.5pt solid; font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><i>/s/
    Michael H. Tardugno</i></span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Michael
    H. Tardugno</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Chairman,
    President and Chief Executive Officer</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">By:</span></td>
    <td style="border-bottom: black 1.5pt solid; font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><i>/s/
    Jeffrey W. Church</i></span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Jeffrey
    W. Church</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Executive
    Vice President and Chief Financial Officer</span></td></tr>
  </table>
<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>


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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"></p>

</body>
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</DOCUMENT>
<DOCUMENT>
<TYPE>EX-31.1
<SEQUENCE>2
<FILENAME>ex31-1.htm
<TEXT>
<HTML>
<HEAD>
     <TITLE></TITLE>
</HEAD>
<BODY STYLE="font: 10pt Times New Roman, Times, Serif">

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: right"><FONT STYLE="font: 10pt Times New Roman, Times, Serif"><B>Exhibit
31.1</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font: 10pt Times New Roman, Times, Serif"><B>CELSION
CORPORATION</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font: 10pt Times New Roman, Times, Serif"><B>CERTIFICATION</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">I,
Michael H. Tardugno, certify that:</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 0.25in"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 0.25in"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">1.</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">I
    have reviewed this quarterly report on Form 10-Q of Celsion Corporation;</FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">2.</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">Based
    on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary
    to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to
    the period covered by this report;</FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">3.</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">Based
    on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material
    respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in
    this report;</FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">4.</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">The
    registrant&rsquo;s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures
    (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)), and internal control over financial reporting (as defined in Exchange
    Act Rules 13a-15(f) and 15d-15 (f)), for the registrant and have:</FONT></TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 0.5in"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 0.25in"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">(a)</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">Designed
    such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision,
    to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others
    within those entities, particularly during the period in which this report is being prepared;</FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">(b)</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">Designed
    such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our
    supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements
    for external purposes in accordance with generally accepted accounting principles;</FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">(c)</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">Evaluated
    the effectiveness of the registrant&rsquo;s disclosure controls and procedures and presented in this report our conclusions about
    the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation;
    and</FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">(d)</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">Disclosed
    in this report any change in the registrant&rsquo;s internal control over financial reporting that occurred during the registrant&rsquo;s
    most recent fiscal quarter that has materially affected, or is reasonably likely to materially affect, the registrant&rsquo;s internal
    control over financial reporting; and</FONT></TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 0.25in"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 0.25in"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">5.</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">The
    registrant&rsquo;s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial
    reporting, to the registrant&rsquo;s auditors and the audit committee of the registrant&rsquo;s board of directors (or persons performing
    the equivalent functions):</FONT></TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 0.5in"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 0.25in"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">(a)</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">All
    significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are
    reasonably likely to adversely affect the registrant&rsquo;s ability to record, process, summarize and report financial information;
    and</FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">(b)</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">Any
    fraud, whether or not material, that involves management or other employees who have a significant role in the registrant&rsquo;s
    internal control over financial reporting.</FONT></TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD COLSPAN="2" STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif"><B>Celsion
    Corporation</B></FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 50%"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 3%"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 47%"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">August
    12, 2021</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">By:
    </FONT></TD>
    <TD STYLE="border-bottom: black 1.5pt solid; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif"><I>/s/
    Michael H. Tardugno</I></FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">Michael
    H. Tardugno</FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">Chairman,
    President and Chief Executive Officer</FONT></TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></P>


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</DOCUMENT>
<DOCUMENT>
<TYPE>EX-31.2
<SEQUENCE>3
<FILENAME>ex31-2.htm
<TEXT>
<HTML>
<HEAD>
     <TITLE></TITLE>
</HEAD>
<BODY STYLE="font: 10pt Times New Roman, Times, Serif">

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: right"><FONT STYLE="font: 10pt Times New Roman, Times, Serif"><B>Exhibit
31.2</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font: 10pt Times New Roman, Times, Serif"><B>CELSION
CORPORATION</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font: 10pt Times New Roman, Times, Serif"><B>CERTIFICATION</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">I,
Jeffrey W. Church, certify that:</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 0.25in; text-align: justify"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 0.25in; text-align: justify"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">1.</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">I
    have reviewed this quarterly report on Form 10-Q of Celsion Corporation;</FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">2.</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">Based
    on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary
    to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to
    the period covered by this report;</FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">3.</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">Based
    on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material
    respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in
    this report;</FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">4.</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">The
    registrant&rsquo;s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures
    (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)), and internal control over financial reporting (as defined in Exchange
    Act Rules 13a-15(f) and 15d-15 (f)), for the registrant and have:</FONT></TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 0.5in"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 0.25in"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">(a)</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">Designed
    such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision,
    to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others
    within those entities, particularly during the period in which this report is being prepared;</FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">(b)</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">Designed
    such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our
    supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements
    for external purposes in accordance with generally accepted accounting principles;</FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">(c)</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">Evaluated
    the effectiveness of the registrant&rsquo;s disclosure controls and procedures and presented in this report our conclusions about
    the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation;
    and</FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">(d)</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">Disclosed
    in this report any change in the registrant&rsquo;s internal control over financial reporting that occurred during the registrant&rsquo;s
    most recent fiscal quarter that has materially affected, or is reasonably likely to materially affect, the registrant&rsquo;s internal
    control over financial reporting; and</FONT></TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 0.25in"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 0.25in"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">5.</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">The
    registrant&rsquo;s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial
    reporting, to the registrant&rsquo;s auditors and the audit committee of the registrant&rsquo;s board of directors (or persons performing
    the equivalent functions):</FONT></TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 0.5in"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 0.25in"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">(a)</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">All
    significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are
    reasonably likely to adversely affect the registrant&rsquo;s ability to record, process, summarize and report financial information;
    and</FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">(b)</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">Any
    fraud, whether or not material, that involves management or other employees who have a significant role in the registrant&rsquo;s
    internal control over financial reporting.</FONT></TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD COLSPAN="2" STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif"><B>Celsion
    Corporation</B></FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 50%"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 3%"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 47%"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">August
    12, 2021</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">By:
    </FONT></TD>
    <TD STYLE="border-bottom: black 1.5pt solid; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif"><I>/s/
    Jeffrey W. Church</I></FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">Jeffrey
    W. Church</FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">Executive
    Vice President and Chief Financial Officer</FONT></TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></P>


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<DOCUMENT>
<TYPE>EX-32.1
<SEQUENCE>4
<FILENAME>ex32-1.htm
<TEXT>
<HTML>
<HEAD>
     <TITLE></TITLE>
</HEAD>
<BODY STYLE="font: 10pt Times New Roman, Times, Serif">

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>&nbsp;</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: right"><FONT STYLE="font: 10pt Times New Roman, Times, Serif"><B>Exhibit
32.1</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font: 10pt Times New Roman, Times, Serif"><B>CELSION
CORPORATION</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font: 10pt Times New Roman, Times, Serif"><B>SECTION
1350 CERTIFICATIONS*</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">Pursuant
to the requirement set forth in Rule 13a-14(b) of the Securities Exchange Act of 1934, as amended (the &ldquo;Exchange Act&rdquo;), and
Section 1350 of Chapter 63 of Title 18 of the United States Code (18 U.S.C. &sect;1350), each of the undersigned hereby certifies that,
to the best of his knowledge, (i) the Quarterly Report on Form 10-Q for the period ended June 30, 2021 of Celsion Corporation (the &ldquo;Company&rdquo;)
filed with the Securities and Exchange Commission on the date hereof fully complies with the requirements of Section 13(a) or 15(d) of
the Exchange Act and (ii) the information contained in such report fairly presents, in all material respects, the financial condition
and results of operations of the Company.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 50%"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">August
    12, 2021</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 3%"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">By:
    </FONT></TD>
    <TD STYLE="border-bottom: black 1.5pt solid; font: 10pt Times New Roman, Times, Serif; width: 47%"><FONT STYLE="font: 10pt Times New Roman, Times, Serif"><I>/s/
    Michael H. Tardugno</I></FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">Michael
    H. Tardugno</FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">Chairman,
    President and Chief Executive Officer</FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">August
    12, 2021</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">By:</FONT></TD>
    <TD STYLE="border-bottom: black 1.5pt solid; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif"><I>/s/
    Jeffrey W. Church</I></FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">Jeffrey
    W. Church</FONT></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">Executive
    Vice President and Chief Financial Officer</FONT></TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">*
This certification accompanies the Form 10-Q to which it relates, is not deemed filed with the Securities and Exchange Commission and
is not to be incorporated by reference into any filing of the Company under the Securities Act of 1933, as amended, or the Exchange Act
(whether made before or after the date of the Form 10-Q), irrespective of any general incorporation language contained in such filing.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></P>


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<TYPE>EX-101.SCH
<SEQUENCE>5
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	<link:roleType roleURI="http://celsion.com/role/NewAccountingPronouncements" id="NewAccountingPronouncements">
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    <element id="CLSN_LPCCommitmentSharesMember" name="LPCCommitmentSharesMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="CLSN_TwoThousandAndEighteenStockIncentivePlanMember" name="TwoThousandAndEighteenStockIncentivePlanMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="CLSN_TwoThousandSevenStockIncentivePlanMember" name="TwoThousandSevenStockIncentivePlanMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="CLSN_InducementOptionGrantsMember" name="InducementOptionGrantsMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="CLSN_FiveNewEmployeesMember" name="FiveNewEmployeesMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="CLSN_EquityStockAwardsMember" name="EquityStockAwardsMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="CLSN_GrantedUnderTwoThousandEighteenPlanAndTwoThousandSevenPlanMember" name="GrantedUnderTwoThousandEighteenPlanAndTwoThousandSevenPlanMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="CLSN_TwoThousandAndEighteenPlanMember" name="TwoThousandAndEighteenPlanMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="CLSN_InducementAwardsMember" name="InducementAwardsMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="CLSN_EmployeeStockOptionAndRestrictedStockAwardsMember" name="EmployeeStockOptionAndRestrictedStockAwardsMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="CLSN_AmendedAssetPurchaseAgreementMember" name="AmendedAssetPurchaseAgreementMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="CLSN_AchievingMilestoneWithInOneYearMember" name="AchievingMilestoneWithInOneYearMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="CLSN_CertainBusinessDaysOfAchievingMilestoneMember" name="CertainBusinessDaysOfAchievingMilestoneMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="CLSN_EGWCMember" name="EGWCMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="CLSN_FairValueEarnoutMilestoneLiabilityMember" name="FairValueEarnoutMilestoneLiabilityMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="CLSN_FirstLeaseAmendmentMember" name="FirstLeaseAmendmentMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="CLSN_FirstYearMember" name="FirstYearMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
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    <element id="CLSN_HuntsvilleAlabamaMember" name="HuntsvilleAlabamaMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
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    <element id="CLSN_GainLossFromChangeInEarnoutMilestoneLiability" name="GainLossFromChangeInEarnoutMilestoneLiability" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="CLSN_InvestmentIncomeLossNonoperating" name="InvestmentIncomeLossNonoperating" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="CLSN_RecognizedGainsLossesOnExtinguishmentOfDebtNonoperating" name="RecognizedGainsLossesOnExtinguishmentOfDebtNonoperating" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="CLSN_AmortizationOfDeferredFinanceChargesAndDebtDiscountAssociatedWithNotePayable" name="AmortizationOfDeferredFinanceChargesAndDebtDiscountAssociatedWithNotePayable" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="CLSN_ProceedsFromIssuanceOfCommonStockUponConversionOfStockWarrants" name="ProceedsFromIssuanceOfCommonStockUponConversionOfStockWarrants" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="CLSN_ProceedsFromIssuanceOfCommonStockUponConversionOfStockOptions" name="ProceedsFromIssuanceOfCommonStockUponConversionOfStockOptions" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="CLSN_RealizedAndUnrealizedGainsAndLossesNetOnInvestmentInDebtSecurities" name="RealizedAndUnrealizedGainsAndLossesNetOnInvestmentInDebtSecurities" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="CLSN_StockIssuedUponExerciseOfCommonStockWarrants" name="StockIssuedUponExerciseOfCommonStockWarrants" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="CLSN_StockIssuedUponExerciseOfCommonStockWarrantsShares" name="StockIssuedUponExerciseOfCommonStockWarrantsShares" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="CLSN_IssuanceOfCommonStockUponExerciseOfOptions" name="IssuanceOfCommonStockUponExerciseOfOptions" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="CLSN_IssuanceOfCommonStockUponExerciseOfOptionsShares" name="IssuanceOfCommonStockUponExerciseOfOptionsShares" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="CLSN_DisclosureFairValueMeasurementsAbstract" name="DisclosureFairValueMeasurementsAbstract" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="CLSN_DisclosureEarnoutMilestoneLiabilityAbstract" name="DisclosureEarnoutMilestoneLiabilityAbstract" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="CLSN_EarnoutMilestoneLiabilityDisclosureTextBlock" name="EarnoutMilestoneLiabilityDisclosureTextBlock" nillable="true" xbrli:periodType="duration" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" />
    <element id="CLSN_DisclosureWarrantsAbstract" name="DisclosureWarrantsAbstract" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="CLSN_WarrantsTextBlock" name="WarrantsTextBlock" nillable="true" xbrli:periodType="duration" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" />
    <element id="CLSN_DisclosureLeasesAbstract" name="DisclosureLeasesAbstract" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="CLSN_DisclosureTechnologyDevelopmentAndLicensingAgreementsAbstract" name="DisclosureTechnologyDevelopmentAndLicensingAgreementsAbstract" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="CLSN_LicensingTransactionTextBlock" name="LicensingTransactionTextBlock" nillable="true" xbrli:periodType="duration" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" />
    <element id="CLSN_SummaryOfStockOptionAndRestrictedStockAwardsTableTextBlock" name="SummaryOfStockOptionAndRestrictedStockAwardsTableTextBlock" nillable="true" xbrli:periodType="duration" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" />
    <element id="CLSN_ScheduleOfChangesInEarnOutMilestoneLiabilitiesTableTextBlock" name="ScheduleOfChangesInEarnOutMilestoneLiabilitiesTableTextBlock" nillable="true" xbrli:periodType="duration" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" />
    <element id="CLSN_ScheduleOfRiskadjustmentAssessmentTableTextBlock" name="ScheduleOfRiskadjustmentAssessmentTableTextBlock" nillable="true" xbrli:periodType="duration" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" />
    <element id="CLSN_CashAndCashEquivalentsRestrictedCashShorttermInvestmentsAndReceivableOnSaleOfNetOperatingLosses" name="CashAndCashEquivalentsRestrictedCashShorttermInvestmentsAndReceivableOnSaleOfNetOperatingLosses" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="CLSN_NetProceedsFromSaleOfNetOperatingLosses" name="NetProceedsFromSaleOfNetOperatingLosses" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="CLSN_ReceivableOnSaleOfNetOperatingLosses" name="ReceivableOnSaleOfNetOperatingLosses" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="CLSN_PaymentOfDebtEndTermCharges" name="PaymentOfDebtEndTermCharges" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="CLSN_RepaymentOfOutstandingIndebtednessAmount" name="RepaymentOfOutstandingIndebtednessAmount" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="CLSN_NumberOfSharesOfCommonStockIssuableUponExerciseOfWarrantsAndEquityAwards" name="NumberOfSharesOfCommonStockIssuableUponExerciseOfWarrantsAndEquityAwards" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="CLSN_NumberOfSharesOfCommonStockIssuedInCalculationBasicLossPerShare" name="NumberOfSharesOfCommonStockIssuedInCalculationBasicLossPerShare" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="CLSN_DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingWithinThreeMonthsAmortizedCost" name="DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingWithinThreeMonthsAmortizedCost" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="CLSN_DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingWithinThreeMonthsFairValue" name="DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingWithinThreeMonthsFairValue" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="CLSN_DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingBetweenThreeAndTwelveMonthsAmortizedCost" name="DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingBetweenThreeAndTwelveMonthsAmortizedCost" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="CLSN_DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingBetweenThreeAndTwelveMonthsFairValue" name="DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingBetweenThreeAndTwelveMonthsFairValue" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="CLSN_AvailableForSaleDebtSecuritiesAmortizedCostBasisCurrent" name="AvailableForSaleDebtSecuritiesAmortizedCostBasisCurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="CLSN_AvailableForSaleSecuritiesUnrealizedGainsFairValue" name="AvailableForSaleSecuritiesUnrealizedGainsFairValue" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="CLSN_AvailableForSaleSecuritiesUnrealizedHoldingGainsLessThanTwelveMonths" name="AvailableForSaleSecuritiesUnrealizedHoldingGainsLessThanTwelveMonths" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="CLSN_AvailableForSaleSecuritiesUnrealizedLossFairValue" name="AvailableForSaleSecuritiesUnrealizedLossFairValue" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="CLSN_AvailableForSaleSecuritiesUnrealizedHoldingLossesLessThanTwelveMonths" name="AvailableForSaleSecuritiesUnrealizedHoldingLossesLessThanTwelveMonths" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="CLSN_AvailableForSaleSecuritiesUnrealizedHoldingGainsLossesLessThanTwelveMonths" name="AvailableForSaleSecuritiesUnrealizedHoldingGainsLossesLessThanTwelveMonths" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
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    <element id="CLSN_ClassOfWarrantOrRightWarrantsOrRightsCancelled" name="ClassOfWarrantOrRightWarrantsOrRightsCancelled" nillable="true" xbrli:periodType="instant" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="CLSN_ShelfRegistrationStatementAmount" name="ShelfRegistrationStatementAmount" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
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    <element id="CLSN_PercentageOfUnderwritingDiscountOnPublicOfferingPrice" name="PercentageOfUnderwritingDiscountOnPublicOfferingPrice" nillable="true" xbrli:periodType="duration" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" />
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    <element id="CLSN_StockOptionsStrikePriceDescription" name="StockOptionsStrikePriceDescription" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
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    <element id="CLSN_GainLossFromChangeInFairValueOfEarnOutMilestoneLiability" name="GainLossFromChangeInFairValueOfEarnOutMilestoneLiability" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
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    <element id="CLSN_EarnoutMilestoneLiability1" name="EarnoutMilestoneLiability1" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
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    <element id="CLSN_EarnoutPaymentOptionsDescription" name="EarnoutPaymentOptionsDescription" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="CLSN_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingWeightedAverageExercisePrice" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingWeightedAverageExercisePrice" nillable="true" xbrli:periodType="instant" type="dtr-types:perShareItemType" substitutionGroup="xbrli:item" />
    <element id="CLSN_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExerciseInPeriodWeightedAverageExercisePrice" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExerciseInPeriodWeightedAverageExercisePrice" nillable="true" xbrli:periodType="duration" type="dtr-types:perShareItemType" substitutionGroup="xbrli:item" />
    <element id="CLSN_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionsOutstandingIntrinsicValue" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionsOutstandingIntrinsicValue" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="CLSN_SharebasedCompensationArrangementBySharebasedPaymentAwardNonOptionsOutstandingWeightedAverageRemainingContractualTerm2" name="SharebasedCompensationArrangementBySharebasedPaymentAwardNonOptionsOutstandingWeightedAverageRemainingContractualTerm2" nillable="true" xbrli:periodType="duration" type="xbrli:durationItemType" substitutionGroup="xbrli:item" />
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    <element id="CLSN_OperatingLeaseImputedInterest" name="OperatingLeaseImputedInterest" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
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    <element id="CLSN_UpfrontPaymentBeingRecognized" name="UpfrontPaymentBeingRecognized" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="CLSN_EarlyTerminationAndEndOfTermFeePaidOnNotesPayable" name="EarlyTerminationAndEndOfTermFeePaidOnNotesPayable" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="CLSN_UnrestrictedCashPercentage" name="UnrestrictedCashPercentage" nillable="true" xbrli:periodType="duration" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" />
</schema>
</XBRL>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-101.CAL
<SEQUENCE>6
<FILENAME>clsn-20210630_cal.xml
<DESCRIPTION>XBRL CALCULATION FILE
<TEXT>
<XBRL>
<?xml version="1.0" encoding="US-ASCII" standalone="no"?>
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      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_LegalEntityAxis" xlink:to="dei_LegalEntityAxis_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_LegalEntityAxis_lbl" xml:lang="en-US">Series [Axis]</link:label>
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      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_HorizonTechnologyFinanceCorporationMember" xlink:to="CLSN_HorizonTechnologyFinanceCorporationMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_HorizonTechnologyFinanceCorporationMember_lbl" xml:lang="en-US">Horizon Technology Finance Corporation [Member]</link:label>
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      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_VariableRateAxis" xlink:to="us-gaap_VariableRateAxis_lbl" xlink:type="arc" />
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LondonInterbankOfferedRateLIBORMember_lbl" xml:lang="en-US">London Interbank Offered Rate (LIBOR) [Member]</link:label>
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      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_AmendmentToHorizonCreditAgreementMember" xlink:to="CLSN_AmendmentToHorizonCreditAgreementMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_AmendmentToHorizonCreditAgreementMember_lbl" xml:lang="en-US">Amendment to Horizon Credit Agreement [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:label="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:to="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_lbl" xml:lang="en-US">Related Party [Axis]</link:label>
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      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_SiliconValleyBankMember" xlink:to="CLSN_SiliconValleyBankMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_SiliconValleyBankMember_lbl" xml:lang="en-US">Silicon Valley Bank [Member]</link:label>
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      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_SVBLoanFacilityMember" xlink:to="CLSN_SVBLoanFacilityMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_SVBLoanFacilityMember_lbl" xml:lang="en-US">SVB Loan Facility [Member]</link:label>
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      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PrimeRateMember" xlink:to="us-gaap_PrimeRateMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PrimeRateMember_lbl" xml:lang="en-US">Prime Rate [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_CapitalOnDemandTMSalesAgreementMember" xlink:label="CLSN_CapitalOnDemandTMSalesAgreementMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_CapitalOnDemandTMSalesAgreementMember" xlink:to="CLSN_CapitalOnDemandTMSalesAgreementMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_CapitalOnDemandTMSalesAgreementMember_lbl" xml:lang="en-US">Capital on DemandTM Sales Agreement [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_JonesTradingInstitutionalServicesLLCMember" xlink:label="CLSN_JonesTradingInstitutionalServicesLLCMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_JonesTradingInstitutionalServicesLLCMember" xlink:to="CLSN_JonesTradingInstitutionalServicesLLCMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_JonesTradingInstitutionalServicesLLCMember_lbl" xml:lang="en-US">Jones Trading Institutional Services, LLC [Member]</link:label>
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      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FinancialInstrumentAxis" xlink:to="us-gaap_FinancialInstrumentAxis_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FinancialInstrumentAxis_lbl" xml:lang="en-US">Financial Instrument [Axis]</link:label>
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      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CommercialPaperMember" xlink:to="us-gaap_CommercialPaperMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CommercialPaperMember_lbl" xml:lang="en-US">Commercial Paper [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_GovernmentBackedDebtSecuritiesMember" xlink:label="CLSN_GovernmentBackedDebtSecuritiesMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_GovernmentBackedDebtSecuritiesMember" xlink:to="CLSN_GovernmentBackedDebtSecuritiesMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_GovernmentBackedDebtSecuritiesMember_lbl" xml:lang="en-US">Government Backed Debt Securities [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueByMeasurementFrequencyAxis" xlink:label="us-gaap_FairValueByMeasurementFrequencyAxis" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueByMeasurementFrequencyAxis" xlink:to="us-gaap_FairValueByMeasurementFrequencyAxis_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FairValueByMeasurementFrequencyAxis_lbl" xml:lang="en-US">Measurement Frequency [Axis]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementsRecurringMember" xlink:label="us-gaap_FairValueMeasurementsRecurringMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueMeasurementsRecurringMember" xlink:to="us-gaap_FairValueMeasurementsRecurringMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FairValueMeasurementsRecurringMember_lbl" xml:lang="en-US">Fair Value, Recurring [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CorporateDebtSecuritiesMember" xlink:label="us-gaap_CorporateDebtSecuritiesMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CorporateDebtSecuritiesMember" xlink:to="us-gaap_CorporateDebtSecuritiesMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CorporateDebtSecuritiesMember_lbl" xml:lang="en-US">Corporate Debt Securities [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:label="us-gaap_FairValueByFairValueHierarchyLevelAxis" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:to="us-gaap_FairValueByFairValueHierarchyLevelAxis_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FairValueByFairValueHierarchyLevelAxis_lbl" xml:lang="en-US">Fair Value Hierarchy and NAV [Axis]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueInputsLevel1Member" xlink:label="us-gaap_FairValueInputsLevel1Member" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueInputsLevel1Member" xlink:to="us-gaap_FairValueInputsLevel1Member_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FairValueInputsLevel1Member_lbl" xml:lang="en-US">Fair Value, Inputs, Level 1 [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueInputsLevel2Member" xlink:label="us-gaap_FairValueInputsLevel2Member" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueInputsLevel2Member" xlink:to="us-gaap_FairValueInputsLevel2Member_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FairValueInputsLevel2Member_lbl" xml:lang="en-US">Fair Value, Inputs, Level 2 [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueInputsLevel3Member" xlink:label="us-gaap_FairValueInputsLevel3Member" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueInputsLevel3Member" xlink:to="us-gaap_FairValueInputsLevel3Member_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FairValueInputsLevel3Member_lbl" xml:lang="en-US">Fair Value, Inputs, Level 3 [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementsNonrecurringMember" xlink:label="us-gaap_FairValueMeasurementsNonrecurringMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueMeasurementsNonrecurringMember" xlink:to="us-gaap_FairValueMeasurementsNonrecurringMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FairValueMeasurementsNonrecurringMember_lbl" xml:lang="en-US">Fair Value, Nonrecurring [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_InprocessRandDMember" xlink:label="CLSN_InprocessRandDMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_InprocessRandDMember" xlink:to="CLSN_InprocessRandDMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_InprocessRandDMember_lbl" xml:lang="en-US">Inprocess R&amp;D [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="us-gaap_BusinessAcquisitionAxis" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_BusinessAcquisitionAxis" xlink:to="us-gaap_BusinessAcquisitionAxis_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_BusinessAcquisitionAxis_lbl" xml:lang="en-US">Business Acquisition [Axis]</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_EGENIncMember" xlink:label="CLSN_EGENIncMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_EGENIncMember" xlink:to="CLSN_EGENIncMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_EGENIncMember_lbl" xml:lang="en-US">EGEN Inc [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_IPRAndDDrugTechnologyPlatformsMember" xlink:label="CLSN_IPRAndDDrugTechnologyPlatformsMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_IPRAndDDrugTechnologyPlatformsMember" xlink:to="CLSN_IPRAndDDrugTechnologyPlatformsMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_IPRAndDDrugTechnologyPlatformsMember_lbl" xml:lang="en-US">Glioblastoma Multiforme Brain Cancer [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ContingentConsiderationByTypeAxis" xlink:label="us-gaap_ContingentConsiderationByTypeAxis" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ContingentConsiderationByTypeAxis" xlink:to="us-gaap_ContingentConsiderationByTypeAxis_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ContingentConsiderationByTypeAxis_lbl" xml:lang="en-US">Contingent Consideration by Type [Axis]</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_OvarianCancerMember" xlink:label="CLSN_OvarianCancerMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_OvarianCancerMember" xlink:to="CLSN_OvarianCancerMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_OvarianCancerMember_lbl" xml:lang="en-US">Ovarian Cancer [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_GlioblastomaMultiformeBrainCancerMember" xlink:label="CLSN_GlioblastomaMultiformeBrainCancerMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_GlioblastomaMultiformeBrainCancerMember" xlink:to="CLSN_GlioblastomaMultiformeBrainCancerMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="CLSN_GlioblastomaMultiformeBrainCancerMember_lbl" xml:lang="en-US">Glioblastoma Multiforme Brain Cancer [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_PurchaseAgreementMember" xlink:label="CLSN_PurchaseAgreementMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_PurchaseAgreementMember" xlink:to="CLSN_PurchaseAgreementMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_PurchaseAgreementMember_lbl" xml:lang="en-US">Purchase Agreement [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_AspirePurchaseAgreementsMember" xlink:label="CLSN_AspirePurchaseAgreementsMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_AspirePurchaseAgreementsMember" xlink:to="CLSN_AspirePurchaseAgreementsMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_AspirePurchaseAgreementsMember_lbl" xml:lang="en-US">2018 Aspire Purchase Agreements [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueByAssetClassAxis" xlink:label="us-gaap_FairValueByAssetClassAxis" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueByAssetClassAxis" xlink:to="us-gaap_FairValueByAssetClassAxis_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FairValueByAssetClassAxis_lbl" xml:lang="en-US">Asset Class [Axis]</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_IPRAndDMember" xlink:label="CLSN_IPRAndDMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_IPRAndDMember" xlink:to="CLSN_IPRAndDMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_IPRAndDMember_lbl" xml:lang="en-US">IPR&amp;D [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GoodwillMember" xlink:label="us-gaap_GoodwillMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_GoodwillMember" xlink:to="us-gaap_GoodwillMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_GoodwillMember_lbl" xml:lang="en-US">Goodwill [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis" xlink:label="us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis" xlink:to="us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_lbl" xml:lang="en-US">Finite-Lived Intangible Assets by Major Class [Axis]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NoncompeteAgreementsMember" xlink:label="us-gaap_NoncompeteAgreementsMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NoncompeteAgreementsMember" xlink:to="us-gaap_NoncompeteAgreementsMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NoncompeteAgreementsMember_lbl" xml:lang="en-US">Noncompete Agreements [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_InitialHorizonCreditAgreementMember" xlink:label="CLSN_InitialHorizonCreditAgreementMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_InitialHorizonCreditAgreementMember" xlink:to="CLSN_InitialHorizonCreditAgreementMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_InitialHorizonCreditAgreementMember_lbl" xml:lang="en-US">Initial Horizon Credit Agreement [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="us-gaap_DebtInstrumentAxis" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DebtInstrumentAxis" xlink:to="us-gaap_DebtInstrumentAxis_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DebtInstrumentAxis_lbl" xml:lang="en-US">Debt Instrument [Axis]</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_InitialHorizonCreditAgreementAmendmentMember" xlink:label="CLSN_InitialHorizonCreditAgreementAmendmentMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_InitialHorizonCreditAgreementAmendmentMember" xlink:to="CLSN_InitialHorizonCreditAgreementAmendmentMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_InitialHorizonCreditAgreementAmendmentMember_lbl" xml:lang="en-US">Initial Horizon Credit Agreement Amendment [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_CapitalOnDemandAgreementMember" xlink:label="CLSN_CapitalOnDemandAgreementMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_CapitalOnDemandAgreementMember" xlink:to="CLSN_CapitalOnDemandAgreementMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_CapitalOnDemandAgreementMember_lbl" xml:lang="en-US">Capital on Demand Agreement [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_SecuritiesPurchaseAgreementMember" xlink:label="CLSN_SecuritiesPurchaseAgreementMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_SecuritiesPurchaseAgreementMember" xlink:to="CLSN_SecuritiesPurchaseAgreementMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_SecuritiesPurchaseAgreementMember_lbl" xml:lang="en-US">Securities Purchase Agreement [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_OriginalWarrantsMember" xlink:label="CLSN_OriginalWarrantsMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_OriginalWarrantsMember" xlink:to="CLSN_OriginalWarrantsMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_OriginalWarrantsMember_lbl" xml:lang="en-US">Original Warrants [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_ExchangeAgreementsMember" xlink:label="CLSN_ExchangeAgreementsMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_ExchangeAgreementsMember" xlink:to="CLSN_ExchangeAgreementsMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_ExchangeAgreementsMember_lbl" xml:lang="en-US">Exchange Agreements [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_WarrantMember" xlink:label="us-gaap_WarrantMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_WarrantMember" xlink:to="us-gaap_WarrantMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_WarrantMember_lbl" xml:lang="en-US">Warrant [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_UnderwritingAgreementMember" xlink:label="CLSN_UnderwritingAgreementMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_UnderwritingAgreementMember" xlink:to="CLSN_UnderwritingAgreementMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_UnderwritingAgreementMember_lbl" xml:lang="en-US">Underwriting Agreement [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SubsidiarySaleOfStockAxis" xlink:label="us-gaap_SubsidiarySaleOfStockAxis" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SubsidiarySaleOfStockAxis" xlink:to="us-gaap_SubsidiarySaleOfStockAxis_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SubsidiarySaleOfStockAxis_lbl" xml:lang="en-US">Sale of Stock [Axis]</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_UnderwrittenOfferingMember" xlink:label="CLSN_UnderwrittenOfferingMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_UnderwrittenOfferingMember" xlink:to="CLSN_UnderwrittenOfferingMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_UnderwrittenOfferingMember_lbl" xml:lang="en-US">Underwritten Offering [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_JanuaryRegisteredDirectOfferingMember" xlink:label="CLSN_JanuaryRegisteredDirectOfferingMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_JanuaryRegisteredDirectOfferingMember" xlink:to="CLSN_JanuaryRegisteredDirectOfferingMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_JanuaryRegisteredDirectOfferingMember_lbl" xml:lang="en-US">January 2021 Registered Direct Offering [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_MarchRegisteredDirectOfferingMember" xlink:label="CLSN_MarchRegisteredDirectOfferingMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_MarchRegisteredDirectOfferingMember" xlink:to="CLSN_MarchRegisteredDirectOfferingMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_MarchRegisteredDirectOfferingMember_lbl" xml:lang="en-US">March 2021 Registered Direct Offering [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_LPCPurchaseAgreementMember" xlink:label="CLSN_LPCPurchaseAgreementMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_LPCPurchaseAgreementMember" xlink:to="CLSN_LPCPurchaseAgreementMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_LPCPurchaseAgreementMember_lbl" xml:lang="en-US">LPC Purchase Agreement [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_LincolnParkCapitalFundLLCMember" xlink:label="CLSN_LincolnParkCapitalFundLLCMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_LincolnParkCapitalFundLLCMember" xlink:to="CLSN_LincolnParkCapitalFundLLCMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_LincolnParkCapitalFundLLCMember_lbl" xml:lang="en-US">Lincoln Park Capital Fund, LLC [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_LPCCommitmentSharesMember" xlink:label="CLSN_LPCCommitmentSharesMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_LPCCommitmentSharesMember" xlink:to="CLSN_LPCCommitmentSharesMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_LPCCommitmentSharesMember_lbl" xml:lang="en-US">LPC Commitment Shares [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PlanNameAxis" xlink:label="us-gaap_PlanNameAxis" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PlanNameAxis" xlink:to="us-gaap_PlanNameAxis_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PlanNameAxis_lbl" xml:lang="en-US">Plan Name [Axis]</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_TwoThousandAndEighteenStockIncentivePlanMember" xlink:label="CLSN_TwoThousandAndEighteenStockIncentivePlanMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_TwoThousandAndEighteenStockIncentivePlanMember" xlink:to="CLSN_TwoThousandAndEighteenStockIncentivePlanMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_TwoThousandAndEighteenStockIncentivePlanMember_lbl" xml:lang="en-US">2018 Stock Incentive Plan [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_TwoThousandSevenStockIncentivePlanMember" xlink:label="CLSN_TwoThousandSevenStockIncentivePlanMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_TwoThousandSevenStockIncentivePlanMember" xlink:to="CLSN_TwoThousandSevenStockIncentivePlanMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_TwoThousandSevenStockIncentivePlanMember_lbl" xml:lang="en-US">2007 Stock Incentive Plan [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_InducementOptionGrantsMember" xlink:label="CLSN_InducementOptionGrantsMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_InducementOptionGrantsMember" xlink:to="CLSN_InducementOptionGrantsMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_InducementOptionGrantsMember_lbl" xml:lang="en-US">Inducement Option Grants [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_TitleOfIndividualAxis" xlink:label="srt_TitleOfIndividualAxis" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="srt_TitleOfIndividualAxis" xlink:to="srt_TitleOfIndividualAxis_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="srt_TitleOfIndividualAxis_lbl" xml:lang="en-US">Title of Individual [Axis]</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_FiveNewEmployeesMember" xlink:label="CLSN_FiveNewEmployeesMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_FiveNewEmployeesMember" xlink:to="CLSN_FiveNewEmployeesMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_FiveNewEmployeesMember_lbl" xml:lang="en-US">Five New Employees [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="us-gaap_AwardTypeAxis" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AwardTypeAxis" xlink:to="us-gaap_AwardTypeAxis_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AwardTypeAxis_lbl" xml:lang="en-US">Award Type [Axis]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestrictedStockMember" xlink:label="us-gaap_RestrictedStockMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RestrictedStockMember" xlink:to="us-gaap_RestrictedStockMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_RestrictedStockMember_lbl" xml:lang="en-US">Restricted Stock [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_EquityStockAwardsMember" xlink:label="CLSN_EquityStockAwardsMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_EquityStockAwardsMember" xlink:to="CLSN_EquityStockAwardsMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_EquityStockAwardsMember_lbl" xml:lang="en-US">Equity Stock Awards [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_StatementScenarioAxis" xlink:label="srt_StatementScenarioAxis" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="srt_StatementScenarioAxis" xlink:to="srt_StatementScenarioAxis_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="srt_StatementScenarioAxis_lbl" xml:lang="en-US">Scenario [Axis]</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_GrantedUnderTwoThousandEighteenPlanAndTwoThousandSevenPlanMember" xlink:label="CLSN_GrantedUnderTwoThousandEighteenPlanAndTwoThousandSevenPlanMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_GrantedUnderTwoThousandEighteenPlanAndTwoThousandSevenPlanMember" xlink:to="CLSN_GrantedUnderTwoThousandEighteenPlanAndTwoThousandSevenPlanMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_GrantedUnderTwoThousandEighteenPlanAndTwoThousandSevenPlanMember_lbl" xml:lang="en-US">Granted Under 2018 Plan and 2007 Plan [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_TwoThousandAndEighteenPlanMember" xlink:label="CLSN_TwoThousandAndEighteenPlanMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_TwoThousandAndEighteenPlanMember" xlink:to="CLSN_TwoThousandAndEighteenPlanMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_TwoThousandAndEighteenPlanMember_lbl" xml:lang="en-US">2018 Plan [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_InducementAwardsMember" xlink:label="CLSN_InducementAwardsMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_InducementAwardsMember" xlink:to="CLSN_InducementAwardsMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_InducementAwardsMember_lbl" xml:lang="en-US">Inducement Awards [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_EmployeeStockOptionAndRestrictedStockAwardsMember" xlink:label="CLSN_EmployeeStockOptionAndRestrictedStockAwardsMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_EmployeeStockOptionAndRestrictedStockAwardsMember" xlink:to="CLSN_EmployeeStockOptionAndRestrictedStockAwardsMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_EmployeeStockOptionAndRestrictedStockAwardsMember_lbl" xml:lang="en-US">Stock Options and Restricted Stock Awards [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementLocationAxis" xlink:label="us-gaap_IncomeStatementLocationAxis" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncomeStatementLocationAxis" xlink:to="us-gaap_IncomeStatementLocationAxis_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_IncomeStatementLocationAxis_lbl" xml:lang="en-US">Income Statement Location [Axis]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ResearchAndDevelopmentExpenseMember" xlink:label="us-gaap_ResearchAndDevelopmentExpenseMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ResearchAndDevelopmentExpenseMember" xlink:to="us-gaap_ResearchAndDevelopmentExpenseMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ResearchAndDevelopmentExpenseMember_lbl" xml:lang="en-US">Research and Development Expense [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GeneralAndAdministrativeExpenseMember" xlink:label="us-gaap_GeneralAndAdministrativeExpenseMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_GeneralAndAdministrativeExpenseMember" xlink:to="us-gaap_GeneralAndAdministrativeExpenseMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_GeneralAndAdministrativeExpenseMember_lbl" xml:lang="en-US">General and Administrative Expense [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EmployeeStockOptionMember" xlink:label="us-gaap_EmployeeStockOptionMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_EmployeeStockOptionMember" xlink:to="us-gaap_EmployeeStockOptionMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_EmployeeStockOptionMember_lbl" xml:lang="en-US">Share-based Payment Arrangement, Option [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_AmendedAssetPurchaseAgreementMember" xlink:label="CLSN_AmendedAssetPurchaseAgreementMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_AmendedAssetPurchaseAgreementMember" xlink:to="CLSN_AmendedAssetPurchaseAgreementMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_AmendedAssetPurchaseAgreementMember_lbl" xml:lang="en-US">Amended Asset Purchase Agreement [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RelatedPartyTransactionAxis" xlink:label="us-gaap_RelatedPartyTransactionAxis" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RelatedPartyTransactionAxis" xlink:to="us-gaap_RelatedPartyTransactionAxis_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_RelatedPartyTransactionAxis_lbl" xml:lang="en-US">Related Party Transaction [Axis]</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_AchievingMilestoneWithInOneYearMember" xlink:label="CLSN_AchievingMilestoneWithInOneYearMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_AchievingMilestoneWithInOneYearMember" xlink:to="CLSN_AchievingMilestoneWithInOneYearMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_AchievingMilestoneWithInOneYearMember_lbl" xml:lang="en-US">Within One Year of Achieving Milestone [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_CertainBusinessDaysOfAchievingMilestoneMember" xlink:label="CLSN_CertainBusinessDaysOfAchievingMilestoneMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_CertainBusinessDaysOfAchievingMilestoneMember" xlink:to="CLSN_CertainBusinessDaysOfAchievingMilestoneMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_CertainBusinessDaysOfAchievingMilestoneMember_lbl" xml:lang="en-US">10 Business Days of Achieving Milestone [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_EGWCMember" xlink:label="CLSN_EGWCMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_EGWCMember" xlink:to="CLSN_EGWCMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_EGWCMember_lbl" xml:lang="en-US">EGWC, Inc [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_FairValueEarnoutMilestoneLiabilityMember" xlink:label="CLSN_FairValueEarnoutMilestoneLiabilityMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_FairValueEarnoutMilestoneLiabilityMember" xlink:to="CLSN_FairValueEarnoutMilestoneLiabilityMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_FairValueEarnoutMilestoneLiabilityMember_lbl" xml:lang="en-US">Fair Value Earnout Milestone Liability [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_FirstLeaseAmendmentMember" xlink:label="CLSN_FirstLeaseAmendmentMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_FirstLeaseAmendmentMember" xlink:to="CLSN_FirstLeaseAmendmentMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_FirstLeaseAmendmentMember_lbl" xml:lang="en-US">1st Lease Amendment [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_FirstYearMember" xlink:label="CLSN_FirstYearMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_FirstYearMember" xlink:to="CLSN_FirstYearMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_FirstYearMember_lbl" xml:lang="en-US">First Year [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_FinalYearMember" xlink:label="CLSN_FinalYearMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_FinalYearMember" xlink:to="CLSN_FinalYearMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_FinalYearMember_lbl" xml:lang="en-US">Final Year [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_SecondLeaseAmendmentMember" xlink:label="CLSN_SecondLeaseAmendmentMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_SecondLeaseAmendmentMember" xlink:to="CLSN_SecondLeaseAmendmentMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_SecondLeaseAmendmentMember_lbl" xml:lang="en-US">2nd Lease Amendment [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_EGENAssetPurchaseAgreementMember" xlink:label="CLSN_EGENAssetPurchaseAgreementMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_EGENAssetPurchaseAgreementMember" xlink:to="CLSN_EGENAssetPurchaseAgreementMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_EGENAssetPurchaseAgreementMember_lbl" xml:lang="en-US">EGEN Asset Purchase Agreement [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_HuntsvilleAlabamaMember" xlink:label="CLSN_HuntsvilleAlabamaMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_HuntsvilleAlabamaMember" xlink:to="CLSN_HuntsvilleAlabamaMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_HuntsvilleAlabamaMember_lbl" xml:lang="en-US">Huntsville Alabama [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AdjustmentsForNewAccountingPronouncementsAxis" xlink:label="us-gaap_AdjustmentsForNewAccountingPronouncementsAxis" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AdjustmentsForNewAccountingPronouncementsAxis" xlink:to="us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_lbl" xml:lang="en-US">Accounting Standards Update [Axis]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccountingStandardsUpdate201602Member" xlink:label="us-gaap_AccountingStandardsUpdate201602Member" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AccountingStandardsUpdate201602Member" xlink:to="us-gaap_AccountingStandardsUpdate201602Member_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AccountingStandardsUpdate201602Member_lbl" xml:lang="en-US">Accounting Standards Update 2016-02 [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_OperatingLeasesMember" xlink:label="CLSN_OperatingLeasesMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_OperatingLeasesMember" xlink:to="CLSN_OperatingLeasesMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_OperatingLeasesMember_lbl" xml:lang="en-US">Operating Leases [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis" xlink:label="us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis" xlink:to="us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis_lbl" xml:lang="en-US">Legal Entity of Counterparty, Type [Axis]</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_HisunMember" xlink:label="CLSN_HisunMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_HisunMember" xlink:to="CLSN_HisunMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_HisunMember_lbl" xml:lang="en-US">Hisun [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_CoverAbstract" xlink:label="dei_CoverAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_CoverAbstract" xlink:to="dei_CoverAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_CoverAbstract_lbl" xml:lang="en-US">Cover [Abstract]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_DocumentType" xlink:label="dei_DocumentType" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentType" xlink:to="dei_DocumentType_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_DocumentType_lbl" xml:lang="en-US">Document Type</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_AmendmentFlag" xlink:label="dei_AmendmentFlag" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_AmendmentFlag" xlink:to="dei_AmendmentFlag_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_AmendmentFlag_lbl" xml:lang="en-US">Amendment Flag</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_AmendmentDescription" xlink:label="dei_AmendmentDescription" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_AmendmentDescription" xlink:to="dei_AmendmentDescription_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_AmendmentDescription_lbl" xml:lang="en-US">Amendment Description</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_DocumentRegistrationStatement" xlink:label="dei_DocumentRegistrationStatement" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentRegistrationStatement" xlink:to="dei_DocumentRegistrationStatement_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_DocumentRegistrationStatement_lbl" xml:lang="en-US">Document Registration Statement</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_DocumentAnnualReport" xlink:label="dei_DocumentAnnualReport" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentAnnualReport" xlink:to="dei_DocumentAnnualReport_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_DocumentAnnualReport_lbl" xml:lang="en-US">Document Annual Report</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_DocumentQuarterlyReport" xlink:label="dei_DocumentQuarterlyReport" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentQuarterlyReport" xlink:to="dei_DocumentQuarterlyReport_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_DocumentQuarterlyReport_lbl" xml:lang="en-US">Document Quarterly Report</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_DocumentTransitionReport" xlink:label="dei_DocumentTransitionReport" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentTransitionReport" xlink:to="dei_DocumentTransitionReport_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_DocumentTransitionReport_lbl" xml:lang="en-US">Document Transition Report</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_DocumentShellCompanyReport" xlink:label="dei_DocumentShellCompanyReport" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentShellCompanyReport" xlink:to="dei_DocumentShellCompanyReport_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_DocumentShellCompanyReport_lbl" xml:lang="en-US">Document Shell Company Report</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_DocumentShellCompanyEventDate" xlink:label="dei_DocumentShellCompanyEventDate" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentShellCompanyEventDate" xlink:to="dei_DocumentShellCompanyEventDate_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_DocumentShellCompanyEventDate_lbl" xml:lang="en-US">Document Shell Company Event Date</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_DocumentPeriodStartDate" xlink:label="dei_DocumentPeriodStartDate" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentPeriodStartDate" xlink:to="dei_DocumentPeriodStartDate_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_DocumentPeriodStartDate_lbl" xml:lang="en-US">Document Period Start Date</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_DocumentPeriodEndDate" xlink:label="dei_DocumentPeriodEndDate" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentPeriodEndDate" xlink:to="dei_DocumentPeriodEndDate_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_DocumentPeriodEndDate_lbl" xml:lang="en-US">Document Period End Date</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_DocumentFiscalPeriodFocus" xlink:label="dei_DocumentFiscalPeriodFocus" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentFiscalPeriodFocus" xlink:to="dei_DocumentFiscalPeriodFocus_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_DocumentFiscalPeriodFocus_lbl" xml:lang="en-US">Document Fiscal Period Focus</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_DocumentFiscalYearFocus" xlink:label="dei_DocumentFiscalYearFocus" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentFiscalYearFocus" xlink:to="dei_DocumentFiscalYearFocus_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_DocumentFiscalYearFocus_lbl" xml:lang="en-US">Document Fiscal Year Focus</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_CurrentFiscalYearEndDate" xlink:label="dei_CurrentFiscalYearEndDate" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_CurrentFiscalYearEndDate" xlink:to="dei_CurrentFiscalYearEndDate_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_CurrentFiscalYearEndDate_lbl" xml:lang="en-US">Current Fiscal Year End Date</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityFileNumber" xlink:label="dei_EntityFileNumber" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityFileNumber" xlink:to="dei_EntityFileNumber_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityFileNumber_lbl" xml:lang="en-US">Entity File Number</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityRegistrantName" xlink:label="dei_EntityRegistrantName" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityRegistrantName" xlink:to="dei_EntityRegistrantName_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityRegistrantName_lbl" xml:lang="en-US">Entity Registrant Name</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityCentralIndexKey" xlink:label="dei_EntityCentralIndexKey" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityCentralIndexKey" xlink:to="dei_EntityCentralIndexKey_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityCentralIndexKey_lbl" xml:lang="en-US">Entity Central Index Key</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityPrimarySicNumber" xlink:label="dei_EntityPrimarySicNumber" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityPrimarySicNumber" xlink:to="dei_EntityPrimarySicNumber_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityPrimarySicNumber_lbl" xml:lang="en-US">Entity Primary SIC Number</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityTaxIdentificationNumber" xlink:label="dei_EntityTaxIdentificationNumber" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityTaxIdentificationNumber" xlink:to="dei_EntityTaxIdentificationNumber_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityTaxIdentificationNumber_lbl" xml:lang="en-US">Entity Tax Identification Number</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityIncorporationStateCountryCode" xlink:label="dei_EntityIncorporationStateCountryCode" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityIncorporationStateCountryCode" xlink:to="dei_EntityIncorporationStateCountryCode_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityIncorporationStateCountryCode_lbl" xml:lang="en-US">Entity Incorporation, State or Country Code</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityAddressAddressLine1" xlink:label="dei_EntityAddressAddressLine1" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityAddressAddressLine1" xlink:to="dei_EntityAddressAddressLine1_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityAddressAddressLine1_lbl" xml:lang="en-US">Entity Address, Address Line One</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityAddressAddressLine2" xlink:label="dei_EntityAddressAddressLine2" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityAddressAddressLine2" xlink:to="dei_EntityAddressAddressLine2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityAddressAddressLine2_lbl" xml:lang="en-US">Entity Address, Address Line Two</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityAddressAddressLine3" xlink:label="dei_EntityAddressAddressLine3" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityAddressAddressLine3" xlink:to="dei_EntityAddressAddressLine3_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityAddressAddressLine3_lbl" xml:lang="en-US">Entity Address, Address Line Three</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityAddressCityOrTown" xlink:label="dei_EntityAddressCityOrTown" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityAddressCityOrTown" xlink:to="dei_EntityAddressCityOrTown_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityAddressCityOrTown_lbl" xml:lang="en-US">Entity Address, City or Town</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityAddressStateOrProvince" xlink:label="dei_EntityAddressStateOrProvince" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityAddressStateOrProvince" xlink:to="dei_EntityAddressStateOrProvince_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityAddressStateOrProvince_lbl" xml:lang="en-US">Entity Address, State or Province</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityAddressCountry" xlink:label="dei_EntityAddressCountry" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityAddressCountry" xlink:to="dei_EntityAddressCountry_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityAddressCountry_lbl" xml:lang="en-US">Entity Address, Country</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityAddressPostalZipCode" xlink:label="dei_EntityAddressPostalZipCode" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityAddressPostalZipCode" xlink:to="dei_EntityAddressPostalZipCode_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityAddressPostalZipCode_lbl" xml:lang="en-US">Entity Address, Postal Zip Code</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_CountryRegion" xlink:label="dei_CountryRegion" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_CountryRegion" xlink:to="dei_CountryRegion_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_CountryRegion_lbl" xml:lang="en-US">Country Region</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_CityAreaCode" xlink:label="dei_CityAreaCode" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_CityAreaCode" xlink:to="dei_CityAreaCode_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_CityAreaCode_lbl" xml:lang="en-US">City Area Code</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_LocalPhoneNumber" xlink:label="dei_LocalPhoneNumber" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_LocalPhoneNumber" xlink:to="dei_LocalPhoneNumber_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_LocalPhoneNumber_lbl" xml:lang="en-US">Local Phone Number</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_Extension" xlink:label="dei_Extension" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_Extension" xlink:to="dei_Extension_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_Extension_lbl" xml:lang="en-US">Extension</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_WrittenCommunications" xlink:label="dei_WrittenCommunications" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_WrittenCommunications" xlink:to="dei_WrittenCommunications_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_WrittenCommunications_lbl" xml:lang="en-US">Written Communications</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_SolicitingMaterial" xlink:label="dei_SolicitingMaterial" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_SolicitingMaterial" xlink:to="dei_SolicitingMaterial_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_SolicitingMaterial_lbl" xml:lang="en-US">Soliciting Material</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_PreCommencementTenderOffer" xlink:label="dei_PreCommencementTenderOffer" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_PreCommencementTenderOffer" xlink:to="dei_PreCommencementTenderOffer_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_PreCommencementTenderOffer_lbl" xml:lang="en-US">Pre-commencement Tender Offer</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_PreCommencementIssuerTenderOffer" xlink:label="dei_PreCommencementIssuerTenderOffer" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_PreCommencementIssuerTenderOffer" xlink:to="dei_PreCommencementIssuerTenderOffer_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_PreCommencementIssuerTenderOffer_lbl" xml:lang="en-US">Pre-commencement Issuer Tender Offer</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_Security12bTitle" xlink:label="dei_Security12bTitle" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_Security12bTitle" xlink:to="dei_Security12bTitle_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_Security12bTitle_lbl" xml:lang="en-US">Title of 12(b) Security</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_NoTradingSymbolFlag" xlink:label="dei_NoTradingSymbolFlag" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_NoTradingSymbolFlag" xlink:to="dei_NoTradingSymbolFlag_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_NoTradingSymbolFlag_lbl" xml:lang="en-US">No Trading Symbol Flag</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_TradingSymbol" xlink:label="dei_TradingSymbol" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_TradingSymbol" xlink:to="dei_TradingSymbol_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_TradingSymbol_lbl" xml:lang="en-US">Trading Symbol</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_SecurityExchangeName" xlink:label="dei_SecurityExchangeName" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_SecurityExchangeName" xlink:to="dei_SecurityExchangeName_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_SecurityExchangeName_lbl" xml:lang="en-US">Security Exchange Name</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_Security12gTitle" xlink:label="dei_Security12gTitle" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_Security12gTitle" xlink:to="dei_Security12gTitle_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_Security12gTitle_lbl" xml:lang="en-US">Title of 12(g) Security</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_SecurityReportingObligation" xlink:label="dei_SecurityReportingObligation" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_SecurityReportingObligation" xlink:to="dei_SecurityReportingObligation_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_SecurityReportingObligation_lbl" xml:lang="en-US">Security Reporting Obligation</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_AnnualInformationForm" xlink:label="dei_AnnualInformationForm" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_AnnualInformationForm" xlink:to="dei_AnnualInformationForm_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_AnnualInformationForm_lbl" xml:lang="en-US">Annual Information Form</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_AuditedAnnualFinancialStatements" xlink:label="dei_AuditedAnnualFinancialStatements" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_AuditedAnnualFinancialStatements" xlink:to="dei_AuditedAnnualFinancialStatements_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_AuditedAnnualFinancialStatements_lbl" xml:lang="en-US">Audited Annual Financial Statements</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityWellKnownSeasonedIssuer" xlink:label="dei_EntityWellKnownSeasonedIssuer" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityWellKnownSeasonedIssuer" xlink:to="dei_EntityWellKnownSeasonedIssuer_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityWellKnownSeasonedIssuer_lbl" xml:lang="en-US">Entity Well-known Seasoned Issuer</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityVoluntaryFilers" xlink:label="dei_EntityVoluntaryFilers" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityVoluntaryFilers" xlink:to="dei_EntityVoluntaryFilers_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityVoluntaryFilers_lbl" xml:lang="en-US">Entity Voluntary Filers</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityCurrentReportingStatus" xlink:label="dei_EntityCurrentReportingStatus" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityCurrentReportingStatus" xlink:to="dei_EntityCurrentReportingStatus_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityCurrentReportingStatus_lbl" xml:lang="en-US">Entity Current Reporting Status</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityInteractiveDataCurrent" xlink:label="dei_EntityInteractiveDataCurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityInteractiveDataCurrent" xlink:to="dei_EntityInteractiveDataCurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityInteractiveDataCurrent_lbl" xml:lang="en-US">Entity Interactive Data Current</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityFilerCategory" xlink:label="dei_EntityFilerCategory" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityFilerCategory" xlink:to="dei_EntityFilerCategory_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityFilerCategory_lbl" xml:lang="en-US">Entity Filer Category</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntitySmallBusiness" xlink:label="dei_EntitySmallBusiness" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntitySmallBusiness" xlink:to="dei_EntitySmallBusiness_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntitySmallBusiness_lbl" xml:lang="en-US">Entity Small Business</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityEmergingGrowthCompany" xlink:label="dei_EntityEmergingGrowthCompany" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityEmergingGrowthCompany" xlink:to="dei_EntityEmergingGrowthCompany_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityEmergingGrowthCompany_lbl" xml:lang="en-US">Entity Emerging Growth Company</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityExTransitionPeriod" xlink:label="dei_EntityExTransitionPeriod" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityExTransitionPeriod" xlink:to="dei_EntityExTransitionPeriod_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityExTransitionPeriod_lbl" xml:lang="en-US">Elected Not To Use the Extended Transition Period</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_DocumentAccountingStandard" xlink:label="dei_DocumentAccountingStandard" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentAccountingStandard" xlink:to="dei_DocumentAccountingStandard_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_DocumentAccountingStandard_lbl" xml:lang="en-US">Document Accounting Standard</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_OtherReportingStandardItemNumber" xlink:label="dei_OtherReportingStandardItemNumber" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_OtherReportingStandardItemNumber" xlink:to="dei_OtherReportingStandardItemNumber_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_OtherReportingStandardItemNumber_lbl" xml:lang="en-US">Other Reporting Standard Item Number</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityShellCompany" xlink:label="dei_EntityShellCompany" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityShellCompany" xlink:to="dei_EntityShellCompany_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityShellCompany_lbl" xml:lang="en-US">Entity Shell Company</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityPublicFloat" xlink:label="dei_EntityPublicFloat" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityPublicFloat" xlink:to="dei_EntityPublicFloat_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityPublicFloat_lbl" xml:lang="en-US">Entity Public Float</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityBankruptcyProceedingsReportingCurrent" xlink:label="dei_EntityBankruptcyProceedingsReportingCurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityBankruptcyProceedingsReportingCurrent" xlink:to="dei_EntityBankruptcyProceedingsReportingCurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityBankruptcyProceedingsReportingCurrent_lbl" xml:lang="en-US">Entity Bankruptcy Proceedings, Reporting Current</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityCommonStockSharesOutstanding" xlink:label="dei_EntityCommonStockSharesOutstanding" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityCommonStockSharesOutstanding" xlink:to="dei_EntityCommonStockSharesOutstanding_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityCommonStockSharesOutstanding_lbl" xml:lang="en-US">Entity Common Stock, Shares Outstanding</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_DocumentsIncorporatedByReferenceTextBlock" xlink:label="dei_DocumentsIncorporatedByReferenceTextBlock" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentsIncorporatedByReferenceTextBlock" xlink:to="dei_DocumentsIncorporatedByReferenceTextBlock_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_DocumentsIncorporatedByReferenceTextBlock_lbl" xml:lang="en-US">Documents Incorporated by Reference [Text Block]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementOfFinancialPositionAbstract" xlink:label="us-gaap_StatementOfFinancialPositionAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StatementOfFinancialPositionAbstract" xlink:to="us-gaap_StatementOfFinancialPositionAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StatementOfFinancialPositionAbstract_lbl" xml:lang="en-US">Statement of Financial Position [Abstract]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AssetsAbstract" xlink:label="us-gaap_AssetsAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AssetsAbstract" xlink:to="us-gaap_AssetsAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AssetsAbstract_lbl" xml:lang="en-US">ASSETS</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AssetsCurrentAbstract" xlink:label="us-gaap_AssetsCurrentAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AssetsCurrentAbstract" xlink:to="us-gaap_AssetsCurrentAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AssetsCurrentAbstract_lbl" xml:lang="en-US">Current assets:</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="us-gaap_CashAndCashEquivalentsAtCarryingValue" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:to="us-gaap_CashAndCashEquivalentsAtCarryingValue_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CashAndCashEquivalentsAtCarryingValue_lbl" xml:lang="en-US">Cash and cash equivalents</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent" xlink:label="us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent" xlink:to="us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent_lbl" xml:lang="en-US">Investment in debt securities - available for sale, at fair value</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtSecuritiesHeldToMaturityAccruedInterestAfterAllowanceForCreditLoss" xlink:label="us-gaap_DebtSecuritiesHeldToMaturityAccruedInterestAfterAllowanceForCreditLoss" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DebtSecuritiesHeldToMaturityAccruedInterestAfterAllowanceForCreditLoss" xlink:to="us-gaap_DebtSecuritiesHeldToMaturityAccruedInterestAfterAllowanceForCreditLoss_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DebtSecuritiesHeldToMaturityAccruedInterestAfterAllowanceForCreditLoss_lbl" xml:lang="en-US">Accrued interest on investment in debt securities</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GrantsReceivableCurrent" xlink:label="us-gaap_GrantsReceivableCurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_GrantsReceivableCurrent" xlink:to="us-gaap_GrantsReceivableCurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_GrantsReceivableCurrent_lbl" xml:lang="en-US">Advances and deposits on clinical programs and other current assets</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AssetsCurrent" xlink:label="us-gaap_AssetsCurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AssetsCurrent" xlink:to="us-gaap_AssetsCurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_AssetsCurrent_lbl" xml:lang="en-US">Total current assets</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="us-gaap_PropertyPlantAndEquipmentNet" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PropertyPlantAndEquipmentNet" xlink:to="us-gaap_PropertyPlantAndEquipmentNet_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PropertyPlantAndEquipmentNet_lbl" xml:lang="en-US">Property and equipment (at cost, less accumulated depreciation and amortization)</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherAssetsAbstract" xlink:label="us-gaap_OtherAssetsAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OtherAssetsAbstract" xlink:to="us-gaap_OtherAssetsAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OtherAssetsAbstract_lbl" xml:lang="en-US">Other assets:</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherLongTermInvestments" xlink:label="us-gaap_OtherLongTermInvestments" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OtherLongTermInvestments" xlink:to="us-gaap_OtherLongTermInvestments_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OtherLongTermInvestments_lbl" xml:lang="en-US">Money market investments, restricted cash</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredIncomeTaxAssetsNet" xlink:label="us-gaap_DeferredIncomeTaxAssetsNet" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DeferredIncomeTaxAssetsNet" xlink:to="us-gaap_DeferredIncomeTaxAssetsNet_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DeferredIncomeTaxAssetsNet_lbl" xml:lang="en-US">Deferred income tax asset</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill" xlink:label="us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill" xlink:to="us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_lbl" xml:lang="en-US">In-process research and development, net</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_Goodwill" xlink:label="us-gaap_Goodwill" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_Goodwill" xlink:to="us-gaap_Goodwill_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_Goodwill_lbl" xml:lang="en-US">Goodwill</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingLeaseRightOfUseAsset" xlink:label="us-gaap_OperatingLeaseRightOfUseAsset" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OperatingLeaseRightOfUseAsset" xlink:to="us-gaap_OperatingLeaseRightOfUseAsset_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OperatingLeaseRightOfUseAsset_lbl" xml:lang="en-US">Operating lease right-of-use assets, net</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsNet" xlink:label="us-gaap_FiniteLivedIntangibleAssetsNet" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FiniteLivedIntangibleAssetsNet" xlink:to="us-gaap_FiniteLivedIntangibleAssetsNet_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FiniteLivedIntangibleAssetsNet_lbl" xml:lang="en-US">Other intangible assets, net</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DepositsAssetsNoncurrent" xlink:label="us-gaap_DepositsAssetsNoncurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DepositsAssetsNoncurrent" xlink:to="us-gaap_DepositsAssetsNoncurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DepositsAssetsNoncurrent_lbl" xml:lang="en-US">Deposits and other assets</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherAssetsNoncurrent" xlink:label="us-gaap_OtherAssetsNoncurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OtherAssetsNoncurrent" xlink:to="us-gaap_OtherAssetsNoncurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OtherAssetsNoncurrent_lbl" xml:lang="en-US">Total other assets</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_Assets" xlink:label="us-gaap_Assets" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_Assets" xlink:to="us-gaap_Assets_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_Assets_lbl" xml:lang="en-US">Total assets</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:label="us-gaap_LiabilitiesAndStockholdersEquityAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:to="us-gaap_LiabilitiesAndStockholdersEquityAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LiabilitiesAndStockholdersEquityAbstract_lbl" xml:lang="en-US">LIABILITIES AND STOCKHOLDERS&#8217; EQUITY</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LiabilitiesCurrentAbstract" xlink:label="us-gaap_LiabilitiesCurrentAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LiabilitiesCurrentAbstract" xlink:to="us-gaap_LiabilitiesCurrentAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LiabilitiesCurrentAbstract_lbl" xml:lang="en-US">Current liabilities:</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccountsPayableCurrent" xlink:label="us-gaap_AccountsPayableCurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AccountsPayableCurrent" xlink:to="us-gaap_AccountsPayableCurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AccountsPayableCurrent_lbl" xml:lang="en-US">Accounts payable &#8211; trade</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccruedLiabilitiesCurrent" xlink:label="us-gaap_AccruedLiabilitiesCurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AccruedLiabilitiesCurrent" xlink:to="us-gaap_AccruedLiabilitiesCurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AccruedLiabilitiesCurrent_lbl" xml:lang="en-US">Other accrued liabilities</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NotesPayableCurrent" xlink:label="us-gaap_NotesPayableCurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NotesPayableCurrent" xlink:to="us-gaap_NotesPayableCurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NotesPayableCurrent_lbl" xml:lang="en-US">Notes payable &#8211; current portion, net of deferred financing costs</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingLeaseLiabilityCurrent" xlink:label="us-gaap_OperatingLeaseLiabilityCurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OperatingLeaseLiabilityCurrent" xlink:to="us-gaap_OperatingLeaseLiabilityCurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OperatingLeaseLiabilityCurrent_lbl" xml:lang="en-US">Operating lease liability - current portion</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ContractWithCustomerLiabilityCurrent" xlink:label="us-gaap_ContractWithCustomerLiabilityCurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ContractWithCustomerLiabilityCurrent" xlink:to="us-gaap_ContractWithCustomerLiabilityCurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ContractWithCustomerLiabilityCurrent_lbl" xml:lang="en-US">Deferred revenue - current portion</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LiabilitiesCurrent" xlink:label="us-gaap_LiabilitiesCurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LiabilitiesCurrent" xlink:to="us-gaap_LiabilitiesCurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_LiabilitiesCurrent_lbl" xml:lang="en-US">Total current liabilities</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent" xlink:label="us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent" xlink:to="us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent_lbl" xml:lang="en-US">Earn-out milestone liability</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongTermNotesPayable" xlink:label="us-gaap_LongTermNotesPayable" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LongTermNotesPayable" xlink:to="us-gaap_LongTermNotesPayable_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LongTermNotesPayable_lbl" xml:lang="en-US">Notes payable &#8211; non-current portion, net of deferred financing costs</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingLeaseLiabilityNoncurrent" xlink:label="us-gaap_OperatingLeaseLiabilityNoncurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OperatingLeaseLiabilityNoncurrent" xlink:to="us-gaap_OperatingLeaseLiabilityNoncurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OperatingLeaseLiabilityNoncurrent_lbl" xml:lang="en-US">Operating lease liability - non-current portion</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredRevenueNoncurrent" xlink:label="us-gaap_DeferredRevenueNoncurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DeferredRevenueNoncurrent" xlink:to="us-gaap_DeferredRevenueNoncurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DeferredRevenueNoncurrent_lbl" xml:lang="en-US">Deferred revenue - non-current portion</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_Liabilities" xlink:label="us-gaap_Liabilities" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_Liabilities" xlink:to="us-gaap_Liabilities_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_Liabilities_lbl" xml:lang="en-US">Total liabilities</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommitmentsAndContingencies" xlink:label="us-gaap_CommitmentsAndContingencies" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CommitmentsAndContingencies" xlink:to="us-gaap_CommitmentsAndContingencies_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CommitmentsAndContingencies_lbl" xml:lang="en-US">Commitments and contingencies</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockholdersEquityAbstract" xlink:label="us-gaap_StockholdersEquityAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockholdersEquityAbstract" xlink:to="us-gaap_StockholdersEquityAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockholdersEquityAbstract_lbl" xml:lang="en-US">Stockholders&#8217; equity:</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PreferredStockValue" xlink:label="us-gaap_PreferredStockValue" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PreferredStockValue" xlink:to="us-gaap_PreferredStockValue_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PreferredStockValue_lbl" xml:lang="en-US">Preferred Stock - $0.01 par value (100,000 shares authorized, and no shares issued or outstanding at June 30, 2021 and December 31, 2020)</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockValue" xlink:label="us-gaap_CommonStockValue" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CommonStockValue" xlink:to="us-gaap_CommonStockValue_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CommonStockValue_lbl" xml:lang="en-US">Common stock - $0.01 par value (112,500,000 shares authorized; 86,558,070 and 40,701,356 shares issued at June 30, 2021 and December 31, 2020, respectively, and 86,557,736 and 40,701,022 shares outstanding at June 30, 2021 and December 31, 2020, respectively)</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AdditionalPaidInCapital" xlink:label="us-gaap_AdditionalPaidInCapital" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AdditionalPaidInCapital" xlink:to="us-gaap_AdditionalPaidInCapital_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AdditionalPaidInCapital_lbl" xml:lang="en-US">Additional paid-in capital</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax" xlink:label="us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax" xlink:to="us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_lbl" xml:lang="en-US">Accumulated other comprehensive loss</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RetainedEarningsAccumulatedDeficit" xlink:label="us-gaap_RetainedEarningsAccumulatedDeficit" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RetainedEarningsAccumulatedDeficit" xlink:to="us-gaap_RetainedEarningsAccumulatedDeficit_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_RetainedEarningsAccumulatedDeficit_lbl" xml:lang="en-US">Accumulated deficit</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockholdersEquityBeforeTreasuryStock" xlink:label="us-gaap_StockholdersEquityBeforeTreasuryStock" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockholdersEquityBeforeTreasuryStock" xlink:to="us-gaap_StockholdersEquityBeforeTreasuryStock_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_StockholdersEquityBeforeTreasuryStock_lbl" xml:lang="en-US">Total stockholders&#8217; equity before treasury stock</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TreasuryStockValue" xlink:label="us-gaap_TreasuryStockValue" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_TreasuryStockValue" xlink:to="us-gaap_TreasuryStockValue_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_TreasuryStockValue_lbl" xml:lang="en-US">Treasury stock, at cost (334 shares at June 30, 2021 and December 31, 2020)</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockholdersEquity" xlink:label="us-gaap_StockholdersEquity" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockholdersEquity" xlink:to="us-gaap_StockholdersEquity_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_StockholdersEquity_lbl" xml:lang="en-US">Total stockholders&#8217; equity</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquity" xlink:label="us-gaap_LiabilitiesAndStockholdersEquity" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LiabilitiesAndStockholdersEquity" xlink:to="us-gaap_LiabilitiesAndStockholdersEquity_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_LiabilitiesAndStockholdersEquity_lbl" xml:lang="en-US">Total liabilities and stockholders&#8217; equity</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PreferredStockParOrStatedValuePerShare" xlink:label="us-gaap_PreferredStockParOrStatedValuePerShare" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PreferredStockParOrStatedValuePerShare" xlink:to="us-gaap_PreferredStockParOrStatedValuePerShare_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PreferredStockParOrStatedValuePerShare_lbl" xml:lang="en-US">Preferred stock, par value</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PreferredStockSharesAuthorized" xlink:label="us-gaap_PreferredStockSharesAuthorized" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PreferredStockSharesAuthorized" xlink:to="us-gaap_PreferredStockSharesAuthorized_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PreferredStockSharesAuthorized_lbl" xml:lang="en-US">Preferred stock, shares authorized</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PreferredStockSharesIssued" xlink:label="us-gaap_PreferredStockSharesIssued" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PreferredStockSharesIssued" xlink:to="us-gaap_PreferredStockSharesIssued_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PreferredStockSharesIssued_lbl" xml:lang="en-US">Preferred stock, shares issued</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PreferredStockSharesOutstanding" xlink:label="us-gaap_PreferredStockSharesOutstanding" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PreferredStockSharesOutstanding" xlink:to="us-gaap_PreferredStockSharesOutstanding_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PreferredStockSharesOutstanding_lbl" xml:lang="en-US">Preferred stock, shares outstanding</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockParOrStatedValuePerShare" xlink:label="us-gaap_CommonStockParOrStatedValuePerShare" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CommonStockParOrStatedValuePerShare" xlink:to="us-gaap_CommonStockParOrStatedValuePerShare_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CommonStockParOrStatedValuePerShare_lbl" xml:lang="en-US">Common stock, par value</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockSharesAuthorized" xlink:label="us-gaap_CommonStockSharesAuthorized" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CommonStockSharesAuthorized" xlink:to="us-gaap_CommonStockSharesAuthorized_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CommonStockSharesAuthorized_lbl" xml:lang="en-US">Common stock, shares authorized</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockSharesIssued" xlink:label="us-gaap_CommonStockSharesIssued" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CommonStockSharesIssued" xlink:to="us-gaap_CommonStockSharesIssued_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CommonStockSharesIssued_lbl" xml:lang="en-US">Common stock, shares issued</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockSharesOutstanding" xlink:label="us-gaap_CommonStockSharesOutstanding" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CommonStockSharesOutstanding" xlink:to="us-gaap_CommonStockSharesOutstanding_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CommonStockSharesOutstanding_lbl" xml:lang="en-US">Common stock, shares outstanding</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TreasuryStockShares" xlink:label="us-gaap_TreasuryStockShares" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_TreasuryStockShares" xlink:to="us-gaap_TreasuryStockShares_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_TreasuryStockShares_lbl" xml:lang="en-US">Treasury stock, shares</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementAbstract" xlink:label="us-gaap_IncomeStatementAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncomeStatementAbstract" xlink:to="us-gaap_IncomeStatementAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_IncomeStatementAbstract_lbl" xml:lang="en-US">Income Statement [Abstract]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax" xlink:label="us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax" xlink:to="us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_lbl" xml:lang="en-US">Licensing revenue</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingExpensesAbstract" xlink:label="us-gaap_OperatingExpensesAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OperatingExpensesAbstract" xlink:to="us-gaap_OperatingExpensesAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OperatingExpensesAbstract_lbl" xml:lang="en-US">Operating expenses:</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ResearchAndDevelopmentExpense" xlink:label="us-gaap_ResearchAndDevelopmentExpense" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ResearchAndDevelopmentExpense" xlink:to="us-gaap_ResearchAndDevelopmentExpense_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ResearchAndDevelopmentExpense_lbl" xml:lang="en-US">Research and development</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GeneralAndAdministrativeExpense" xlink:label="us-gaap_GeneralAndAdministrativeExpense" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_GeneralAndAdministrativeExpense" xlink:to="us-gaap_GeneralAndAdministrativeExpense_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_GeneralAndAdministrativeExpense_lbl" xml:lang="en-US">General and administrative</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingExpenses" xlink:label="us-gaap_OperatingExpenses" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OperatingExpenses" xlink:to="us-gaap_OperatingExpenses_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_OperatingExpenses_lbl" xml:lang="en-US">Total operating expenses</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingIncomeLoss" xlink:label="us-gaap_OperatingIncomeLoss" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OperatingIncomeLoss" xlink:to="us-gaap_OperatingIncomeLoss_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_OperatingIncomeLoss_lbl" xml:lang="en-US">Loss from operations</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherIncomeAndExpensesAbstract" xlink:label="us-gaap_OtherIncomeAndExpensesAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OtherIncomeAndExpensesAbstract" xlink:to="us-gaap_OtherIncomeAndExpensesAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OtherIncomeAndExpensesAbstract_lbl" xml:lang="en-US">Other (expense) income:</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_GainLossFromChangeInEarnoutMilestoneLiability" xlink:label="CLSN_GainLossFromChangeInEarnoutMilestoneLiability" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_GainLossFromChangeInEarnoutMilestoneLiability" xlink:to="CLSN_GainLossFromChangeInEarnoutMilestoneLiability_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_GainLossFromChangeInEarnoutMilestoneLiability_lbl" xml:lang="en-US">Gain (loss) from change in valuation of earn-out milestone liability</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_InvestmentIncomeLossNonoperating" xlink:label="CLSN_InvestmentIncomeLossNonoperating" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_InvestmentIncomeLossNonoperating" xlink:to="CLSN_InvestmentIncomeLossNonoperating_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_InvestmentIncomeLossNonoperating_lbl" xml:lang="en-US">Investment income</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InterestAndDebtExpense" xlink:label="us-gaap_InterestAndDebtExpense" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InterestAndDebtExpense" xlink:to="us-gaap_InterestAndDebtExpense_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_InterestAndDebtExpense_lbl" xml:lang="en-US">Interest expense</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_RecognizedGainsLossesOnExtinguishmentOfDebtNonoperating" xlink:label="CLSN_RecognizedGainsLossesOnExtinguishmentOfDebtNonoperating" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_RecognizedGainsLossesOnExtinguishmentOfDebtNonoperating" xlink:to="CLSN_RecognizedGainsLossesOnExtinguishmentOfDebtNonoperating_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_RecognizedGainsLossesOnExtinguishmentOfDebtNonoperating_lbl" xml:lang="en-US">Recognized loss on extinguishment of debt</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherNonoperatingIncomeExpense" xlink:label="us-gaap_OtherNonoperatingIncomeExpense" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OtherNonoperatingIncomeExpense" xlink:to="us-gaap_OtherNonoperatingIncomeExpense_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OtherNonoperatingIncomeExpense_lbl" xml:lang="en-US">Other (expense) income</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NonoperatingIncomeExpense" xlink:label="us-gaap_NonoperatingIncomeExpense" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NonoperatingIncomeExpense" xlink:to="us-gaap_NonoperatingIncomeExpense_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_NonoperatingIncomeExpense_lbl" xml:lang="en-US">Total other (expense) income, net</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="us-gaap_NetIncomeLoss" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetIncomeLoss" xlink:to="us-gaap_NetIncomeLoss_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_NetIncomeLoss_lbl" xml:lang="en-US">Net loss</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EarningsPerShareBasicAndDiluted" xlink:label="us-gaap_EarningsPerShareBasicAndDiluted" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_EarningsPerShareBasicAndDiluted" xlink:to="us-gaap_EarningsPerShareBasicAndDiluted_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_EarningsPerShareBasicAndDiluted_lbl" xml:lang="en-US">Basic and diluted</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted" xlink:label="us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted" xlink:to="us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted_lbl" xml:lang="en-US">Basic and diluted</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract" xlink:label="us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract" xlink:to="us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract_lbl" xml:lang="en-US">Statement of Comprehensive Income [Abstract]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAbstract" xlink:label="us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAbstract" xlink:to="us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAbstract_lbl" xml:lang="en-US">Other comprehensive (loss) gain</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParentAbstract" xlink:label="us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParentAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParentAbstract" xlink:to="us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParentAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParentAbstract_lbl" xml:lang="en-US">Changes in:</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax" xlink:label="us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax" xlink:to="us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax_lbl" xml:lang="en-US">Realized gains (losses) on debt securities recognized in investment income, net</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax" xlink:label="us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax" xlink:to="us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax_lbl" xml:lang="en-US">Unrealized (losses) gains on debt securities, net</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax" xlink:label="us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax" xlink:to="us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax_lbl" xml:lang="en-US">Change in unrealized (losses) gains on available for sale securities, net</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetIncomeLoss" xlink:to="us-gaap_NetIncomeLoss_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NetIncomeLoss_2_lbl" xml:lang="en-US">Net loss</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTax" xlink:label="us-gaap_ComprehensiveIncomeNetOfTax" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ComprehensiveIncomeNetOfTax" xlink:to="us-gaap_ComprehensiveIncomeNetOfTax_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_ComprehensiveIncomeNetOfTax_lbl" xml:lang="en-US">Comprehensive loss</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementOfCashFlowsAbstract" xlink:label="us-gaap_StatementOfCashFlowsAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StatementOfCashFlowsAbstract" xlink:to="us-gaap_StatementOfCashFlowsAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StatementOfCashFlowsAbstract_lbl" xml:lang="en-US">Statement of Cash Flows [Abstract]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" xlink:to="us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_lbl" xml:lang="en-US">Cash flows from operating activities:</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:to="us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_lbl" xml:lang="en-US">Adjustments to reconcile net loss to net cash used in operating activities:</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DepreciationDepletionAndAmortization" xlink:label="us-gaap_DepreciationDepletionAndAmortization" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DepreciationDepletionAndAmortization" xlink:to="us-gaap_DepreciationDepletionAndAmortization_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DepreciationDepletionAndAmortization_lbl" xml:lang="en-US">Depreciation and amortization</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_GainLossFromChangeInEarnoutMilestoneLiability" xlink:to="CLSN_GainLossFromChangeInEarnoutMilestoneLiability_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="CLSN_GainLossFromChangeInEarnoutMilestoneLiability_2_lbl" xml:lang="en-US">Change in fair value of earn-out milestone liability</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ContractWithCustomerLiabilityRevenueRecognized" xlink:label="us-gaap_ContractWithCustomerLiabilityRevenueRecognized" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ContractWithCustomerLiabilityRevenueRecognized" xlink:to="us-gaap_ContractWithCustomerLiabilityRevenueRecognized_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_ContractWithCustomerLiabilityRevenueRecognized_lbl" xml:lang="en-US">Recognition of deferred revenue</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensation" xlink:label="us-gaap_ShareBasedCompensation" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensation" xlink:to="us-gaap_ShareBasedCompensation_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensation_lbl" xml:lang="en-US">Stock-based compensation costs</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredIncomeTaxExpenseBenefit" xlink:label="us-gaap_DeferredIncomeTaxExpenseBenefit" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DeferredIncomeTaxExpenseBenefit" xlink:to="us-gaap_DeferredIncomeTaxExpenseBenefit_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_DeferredIncomeTaxExpenseBenefit_lbl" xml:lang="en-US">Deferred income tax asset</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_AmortizationOfDeferredFinanceChargesAndDebtDiscountAssociatedWithNotePayable" xlink:label="CLSN_AmortizationOfDeferredFinanceChargesAndDebtDiscountAssociatedWithNotePayable" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_AmortizationOfDeferredFinanceChargesAndDebtDiscountAssociatedWithNotePayable" xlink:to="CLSN_AmortizationOfDeferredFinanceChargesAndDebtDiscountAssociatedWithNotePayable_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_AmortizationOfDeferredFinanceChargesAndDebtDiscountAssociatedWithNotePayable_lbl" xml:lang="en-US">Amortization of deferred finance charges and debt discount associated with notes payable</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncreaseDecreaseInOperatingCapitalAbstract" xlink:label="us-gaap_IncreaseDecreaseInOperatingCapitalAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncreaseDecreaseInOperatingCapitalAbstract" xlink:to="us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_lbl" xml:lang="en-US">Net changes in:</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncreaseDecreaseInAccruedInvestmentIncomeReceivable" xlink:label="us-gaap_IncreaseDecreaseInAccruedInvestmentIncomeReceivable" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncreaseDecreaseInAccruedInvestmentIncomeReceivable" xlink:to="us-gaap_IncreaseDecreaseInAccruedInvestmentIncomeReceivable_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_IncreaseDecreaseInAccruedInvestmentIncomeReceivable_lbl" xml:lang="en-US">Accrued interest on investment securities</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets" xlink:label="us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets" xlink:to="us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_lbl" xml:lang="en-US">Advances, deposits, and other current assets</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities" xlink:label="us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities" xlink:to="us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_lbl" xml:lang="en-US">Accounts payable and accrued liabilities</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivities" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:to="us-gaap_NetCashProvidedByUsedInOperatingActivities_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivities_lbl" xml:lang="en-US">Net cash used in operating activities</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:to="us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_lbl" xml:lang="en-US">Cash flows from investing activities:</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt" xlink:label="us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt" xlink:to="us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt_lbl" xml:lang="en-US">Purchases of investment securities</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities" xlink:label="us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities" xlink:to="us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities_lbl" xml:lang="en-US">Proceeds from sale and maturity of investment securities</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment" xlink:label="us-gaap_PaymentsToAcquirePropertyPlantAndEquipment" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PaymentsToAcquirePropertyPlantAndEquipment" xlink:to="us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_lbl" xml:lang="en-US">Purchases of property and equipment</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities" xlink:label="us-gaap_NetCashProvidedByUsedInInvestingActivities" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetCashProvidedByUsedInInvestingActivities" xlink:to="us-gaap_NetCashProvidedByUsedInInvestingActivities_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_NetCashProvidedByUsedInInvestingActivities_lbl" xml:lang="en-US">Net cash (used in) provided by investing activities</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:to="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_lbl" xml:lang="en-US">Cash flows from financing activities:</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProceedsFromIssuanceOfCommonStock" xlink:label="us-gaap_ProceedsFromIssuanceOfCommonStock" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ProceedsFromIssuanceOfCommonStock" xlink:to="us-gaap_ProceedsFromIssuanceOfCommonStock_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ProceedsFromIssuanceOfCommonStock_lbl" xml:lang="en-US">Proceeds from sale of common stock equity, net of issuance costs</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_ProceedsFromIssuanceOfCommonStockUponConversionOfStockWarrants" xlink:label="CLSN_ProceedsFromIssuanceOfCommonStockUponConversionOfStockWarrants" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_ProceedsFromIssuanceOfCommonStockUponConversionOfStockWarrants" xlink:to="CLSN_ProceedsFromIssuanceOfCommonStockUponConversionOfStockWarrants_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_ProceedsFromIssuanceOfCommonStockUponConversionOfStockWarrants_lbl" xml:lang="en-US">Proceeds from issuance of common stock upon conversion of stock warrants</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_ProceedsFromIssuanceOfCommonStockUponConversionOfStockOptions" xlink:label="CLSN_ProceedsFromIssuanceOfCommonStockUponConversionOfStockOptions" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_ProceedsFromIssuanceOfCommonStockUponConversionOfStockOptions" xlink:to="CLSN_ProceedsFromIssuanceOfCommonStockUponConversionOfStockOptions_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_ProceedsFromIssuanceOfCommonStockUponConversionOfStockOptions_lbl" xml:lang="en-US">Proceeds from issuance of common stock upon conversion of stock options</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProceedsFromIssuanceOfLongTermDebt" xlink:label="us-gaap_ProceedsFromIssuanceOfLongTermDebt" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ProceedsFromIssuanceOfLongTermDebt" xlink:to="us-gaap_ProceedsFromIssuanceOfLongTermDebt_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ProceedsFromIssuanceOfLongTermDebt_lbl" xml:lang="en-US">Proceeds from the SVB Loan Facility, net of issuance costs</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RepaymentsOfLongTermDebt" xlink:label="us-gaap_RepaymentsOfLongTermDebt" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RepaymentsOfLongTermDebt" xlink:to="us-gaap_RepaymentsOfLongTermDebt_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_RepaymentsOfLongTermDebt_lbl" xml:lang="en-US">Payoff of the Horizon Credit Agreement and accrued end of term fees</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProceedsFromIssuanceOfDebt" xlink:label="us-gaap_ProceedsFromIssuanceOfDebt" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ProceedsFromIssuanceOfDebt" xlink:to="us-gaap_ProceedsFromIssuanceOfDebt_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ProceedsFromIssuanceOfDebt_lbl" xml:lang="en-US">Proceeds from Payroll Protection Program (PPP) loans</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RepaymentsOfDebt" xlink:label="us-gaap_RepaymentsOfDebt" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RepaymentsOfDebt" xlink:to="us-gaap_RepaymentsOfDebt_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_RepaymentsOfDebt_lbl" xml:lang="en-US">Repayments on Payroll Protection Program (PPP) loans</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities" xlink:label="us-gaap_NetCashProvidedByUsedInFinancingActivities" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetCashProvidedByUsedInFinancingActivities" xlink:to="us-gaap_NetCashProvidedByUsedInFinancingActivities_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_NetCashProvidedByUsedInFinancingActivities_lbl" xml:lang="en-US">Net cash provided by financing activities</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect" xlink:to="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_lbl" xml:lang="en-US">Increase in cash, cash equivalents and restricted cash</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations" xlink:to="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations_lbl" xml:lang="en-US">Cash, cash equivalents and restricted cash at beginning of period</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations" xlink:to="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations_2_lbl" xml:lang="en-US">Cash, cash equivalents and restricted cash at end of period</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SupplementalCashFlowInformationAbstract" xlink:label="us-gaap_SupplementalCashFlowInformationAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SupplementalCashFlowInformationAbstract" xlink:to="us-gaap_SupplementalCashFlowInformationAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SupplementalCashFlowInformationAbstract_lbl" xml:lang="en-US">Supplemental disclosures of cash flow information:</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InterestPaidNet" xlink:label="us-gaap_InterestPaidNet" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InterestPaidNet" xlink:to="us-gaap_InterestPaidNet_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_InterestPaidNet_lbl" xml:lang="en-US">Interest paid</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract" xlink:label="us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract" xlink:to="us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_lbl" xml:lang="en-US">Cash paid for amounts included in measurement of lease liabilities:</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingLeasePayments" xlink:label="us-gaap_OperatingLeasePayments" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OperatingLeasePayments" xlink:to="us-gaap_OperatingLeasePayments_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OperatingLeasePayments_lbl" xml:lang="en-US">Operating cash flows from lease payments</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssued1" xlink:label="us-gaap_StockIssued1" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssued1" xlink:to="us-gaap_StockIssued1_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockIssued1_lbl" xml:lang="en-US">Common stock issued to settle accrued bonuses</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_RealizedAndUnrealizedGainsAndLossesNetOnInvestmentInDebtSecurities" xlink:label="CLSN_RealizedAndUnrealizedGainsAndLossesNetOnInvestmentInDebtSecurities" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_RealizedAndUnrealizedGainsAndLossesNetOnInvestmentInDebtSecurities" xlink:to="CLSN_RealizedAndUnrealizedGainsAndLossesNetOnInvestmentInDebtSecurities_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_RealizedAndUnrealizedGainsAndLossesNetOnInvestmentInDebtSecurities_lbl" xml:lang="en-US">Realized and unrealized gains (losses), net, on investment securities</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementTable" xlink:label="us-gaap_StatementTable" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StatementTable" xlink:to="us-gaap_StatementTable_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StatementTable_lbl" xml:lang="en-US">Statement [Table]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementLineItems" xlink:label="us-gaap_StatementLineItems" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_StatementLineItems_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StatementLineItems_lbl" xml:lang="en-US">Statement [Line Items]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockholdersEquity" xlink:to="us-gaap_StockholdersEquity_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="us-gaap_StockholdersEquity_2_lbl" xml:lang="en-US">Beginning balance, value</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SharesOutstanding" xlink:label="us-gaap_SharesOutstanding" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SharesOutstanding" xlink:to="us-gaap_SharesOutstanding_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="us-gaap_SharesOutstanding_lbl" xml:lang="en-US">Balance, shares</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueNewIssues" xlink:label="us-gaap_StockIssuedDuringPeriodValueNewIssues" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssuedDuringPeriodValueNewIssues" xlink:to="us-gaap_StockIssuedDuringPeriodValueNewIssues_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockIssuedDuringPeriodValueNewIssues_lbl" xml:lang="en-US">Sale of equity through equity financing facilities</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesNewIssues" xlink:label="us-gaap_StockIssuedDuringPeriodSharesNewIssues" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssuedDuringPeriodSharesNewIssues" xlink:to="us-gaap_StockIssuedDuringPeriodSharesNewIssues_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockIssuedDuringPeriodSharesNewIssues_lbl" xml:lang="en-US">Sale of equity through equity financing facilities net of fees, shares</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_StockIssuedUponExerciseOfCommonStockWarrants" xlink:label="CLSN_StockIssuedUponExerciseOfCommonStockWarrants" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_StockIssuedUponExerciseOfCommonStockWarrants" xlink:to="CLSN_StockIssuedUponExerciseOfCommonStockWarrants_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_StockIssuedUponExerciseOfCommonStockWarrants_lbl" xml:lang="en-US">Shares issued upon exercise of common stock warrants, net of fees</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_StockIssuedUponExerciseOfCommonStockWarrantsShares" xlink:label="CLSN_StockIssuedUponExerciseOfCommonStockWarrantsShares" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_StockIssuedUponExerciseOfCommonStockWarrantsShares" xlink:to="CLSN_StockIssuedUponExerciseOfCommonStockWarrantsShares_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_StockIssuedUponExerciseOfCommonStockWarrantsShares_lbl" xml:lang="en-US">Shares issued upon exercise of common stock warrants, net of fees, shares</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised" xlink:label="us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised" xlink:to="us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_lbl" xml:lang="en-US">Shares issued upon exercise of options to purchase common stock</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised" xlink:label="us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised" xlink:to="us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_lbl" xml:lang="en-US">Shares issued upon exercise of options to purchase common stock, shares</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent" xlink:label="us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent" xlink:to="us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_lbl" xml:lang="en-US">Realized and unrealized gains and losses, net, on investments securities</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_IssuanceOfCommonStockUponExerciseOfOptions" xlink:label="CLSN_IssuanceOfCommonStockUponExerciseOfOptions" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_IssuanceOfCommonStockUponExerciseOfOptions" xlink:to="CLSN_IssuanceOfCommonStockUponExerciseOfOptions_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_IssuanceOfCommonStockUponExerciseOfOptions_lbl" xml:lang="en-US">Issuance of common stock upon exercise of options</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_IssuanceOfCommonStockUponExerciseOfOptionsShares" xlink:label="CLSN_IssuanceOfCommonStockUponExerciseOfOptionsShares" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_IssuanceOfCommonStockUponExerciseOfOptionsShares" xlink:to="CLSN_IssuanceOfCommonStockUponExerciseOfOptionsShares_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_IssuanceOfCommonStockUponExerciseOfOptionsShares_lbl" xml:lang="en-US">Issuance of common stock upon exercise of options, shares</link:label>
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DebtInstrumentFaceAmount_lbl" xml:lang="en-US">Debt Instrument, Face Amount</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_PaymentOfDebtEndTermCharges" xlink:label="CLSN_PaymentOfDebtEndTermCharges" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_PaymentOfDebtEndTermCharges" xlink:to="CLSN_PaymentOfDebtEndTermCharges_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_PaymentOfDebtEndTermCharges_lbl" xml:lang="en-US">Debt instrument related end term charges</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" xlink:label="us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" xlink:to="us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_lbl" xml:lang="en-US">Line of Credit Facility, Maximum Borrowing Capacity</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_RepaymentOfOutstandingIndebtednessAmount" xlink:label="CLSN_RepaymentOfOutstandingIndebtednessAmount" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_RepaymentOfOutstandingIndebtednessAmount" xlink:to="CLSN_RepaymentOfOutstandingIndebtednessAmount_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_RepaymentOfOutstandingIndebtednessAmount_lbl" xml:lang="en-US">[custom:RepaymentOfOutstandingIndebtednessAmount-0]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity" xlink:label="us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity" xlink:to="us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_lbl" xml:lang="en-US">Line of Credit Facility, Remaining Borrowing Capacity</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentDescription" xlink:label="us-gaap_DebtInstrumentDescription" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DebtInstrumentDescription" xlink:to="us-gaap_DebtInstrumentDescription_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DebtInstrumentDescription_lbl" xml:lang="en-US">Debt Instrument, Description</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProceedsFromWarrantExercises" xlink:label="us-gaap_ProceedsFromWarrantExercises" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ProceedsFromWarrantExercises" xlink:to="us-gaap_ProceedsFromWarrantExercises_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ProceedsFromWarrantExercises_lbl" xml:lang="en-US">Proceeds from Warrant Exercises</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestrictedInvestments" xlink:label="us-gaap_RestrictedInvestments" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RestrictedInvestments" xlink:to="us-gaap_RestrictedInvestments_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_RestrictedInvestments_lbl" xml:lang="en-US">Money market investments, restricted</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" xlink:to="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_lbl" xml:lang="en-US">Total</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable" xlink:label="us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable" xlink:to="us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_lbl" xml:lang="en-US">Schedule of Defined Benefit Plans Disclosures [Table]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_DiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReservesLineItems" xlink:label="srt_DiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReservesLineItems" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="srt_DiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReservesLineItems" xlink:to="srt_DiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReservesLineItems_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="srt_DiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReservesLineItems_lbl" xml:lang="en-US">Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LineOfCreditFacilityDescription" xlink:label="us-gaap_LineOfCreditFacilityDescription" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LineOfCreditFacilityDescription" xlink:to="us-gaap_LineOfCreditFacilityDescription_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LineOfCreditFacilityDescription_lbl" xml:lang="en-US">Line of Credit Facility, Description</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RestrictedInvestments" xlink:to="us-gaap_RestrictedInvestments_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_RestrictedInvestments_2_lbl" xml:lang="en-US">Restricted Investments</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_NumberOfSharesOfCommonStockIssuableUponExerciseOfWarrantsAndEquityAwards" xlink:label="CLSN_NumberOfSharesOfCommonStockIssuableUponExerciseOfWarrantsAndEquityAwards" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_NumberOfSharesOfCommonStockIssuableUponExerciseOfWarrantsAndEquityAwards" xlink:to="CLSN_NumberOfSharesOfCommonStockIssuableUponExerciseOfWarrantsAndEquityAwards_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_NumberOfSharesOfCommonStockIssuableUponExerciseOfWarrantsAndEquityAwards_lbl" xml:lang="en-US">clsn_NumberOfSharesOfCommonStockIssuableUponExerciseOfWarrantsAndEquityAwards</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1" xlink:label="us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1" xlink:to="us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_lbl" xml:lang="en-US">Class of Warrant or Right, Exercise Price of Warrants or Rights</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_NumberOfSharesOfCommonStockIssuedInCalculationBasicLossPerShare" xlink:label="CLSN_NumberOfSharesOfCommonStockIssuedInCalculationBasicLossPerShare" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_NumberOfSharesOfCommonStockIssuedInCalculationBasicLossPerShare" xlink:to="CLSN_NumberOfSharesOfCommonStockIssuedInCalculationBasicLossPerShare_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_NumberOfSharesOfCommonStockIssuedInCalculationBasicLossPerShare_lbl" xml:lang="en-US">Description of Business</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_MarketableSecuritiesTable" xlink:label="us-gaap_MarketableSecuritiesTable" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_MarketableSecuritiesTable" xlink:to="us-gaap_MarketableSecuritiesTable_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_MarketableSecuritiesTable_lbl" xml:lang="en-US">Marketable Securities [Table]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_MarketableSecuritiesLineItems" xlink:label="us-gaap_MarketableSecuritiesLineItems" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_MarketableSecuritiesLineItems" xlink:to="us-gaap_MarketableSecuritiesLineItems_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_MarketableSecuritiesLineItems_lbl" xml:lang="en-US">Marketable Securities [Line Items]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShortTermInvestments" xlink:label="us-gaap_ShortTermInvestments" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShortTermInvestments" xlink:to="us-gaap_ShortTermInvestments_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShortTermInvestments_lbl" xml:lang="en-US">Short-term investments - Cost</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent" xlink:to="us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent_2_lbl" xml:lang="en-US">Short-term investments - Fair Value</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingWithinThreeMonthsAmortizedCost" xlink:label="CLSN_DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingWithinThreeMonthsAmortizedCost" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingWithinThreeMonthsAmortizedCost" xlink:to="CLSN_DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingWithinThreeMonthsAmortizedCost_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingWithinThreeMonthsAmortizedCost_lbl" xml:lang="en-US">Short-term investment maturities - Within 3 months, cost</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingWithinThreeMonthsFairValue" xlink:label="CLSN_DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingWithinThreeMonthsFairValue" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingWithinThreeMonthsFairValue" xlink:to="CLSN_DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingWithinThreeMonthsFairValue_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingWithinThreeMonthsFairValue_lbl" xml:lang="en-US">Short-term investment maturities - Within 3 months, fair value</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingBetweenThreeAndTwelveMonthsAmortizedCost" xlink:label="CLSN_DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingBetweenThreeAndTwelveMonthsAmortizedCost" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingBetweenThreeAndTwelveMonthsAmortizedCost" xlink:to="CLSN_DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingBetweenThreeAndTwelveMonthsAmortizedCost_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingBetweenThreeAndTwelveMonthsAmortizedCost_lbl" xml:lang="en-US">Short-term investment maturities - Between 3-12 months, cost</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingBetweenThreeAndTwelveMonthsFairValue" xlink:label="CLSN_DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingBetweenThreeAndTwelveMonthsFairValue" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingBetweenThreeAndTwelveMonthsFairValue" xlink:to="CLSN_DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingBetweenThreeAndTwelveMonthsFairValue_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingBetweenThreeAndTwelveMonthsFairValue_lbl" xml:lang="en-US">Short-term investment maturities - Between 3-12 months, fair value</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_AvailableForSaleDebtSecuritiesAmortizedCostBasisCurrent" xlink:label="CLSN_AvailableForSaleDebtSecuritiesAmortizedCostBasisCurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_AvailableForSaleDebtSecuritiesAmortizedCostBasisCurrent" xlink:to="CLSN_AvailableForSaleDebtSecuritiesAmortizedCostBasisCurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_AvailableForSaleDebtSecuritiesAmortizedCostBasisCurrent_lbl" xml:lang="en-US">Total, cost</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate" xlink:label="us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate" xlink:to="us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate_lbl" xml:lang="en-US">Total, fair value</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_AvailableForSaleSecuritiesUnrealizedGainsFairValue" xlink:label="CLSN_AvailableForSaleSecuritiesUnrealizedGainsFairValue" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_AvailableForSaleSecuritiesUnrealizedGainsFairValue" xlink:to="CLSN_AvailableForSaleSecuritiesUnrealizedGainsFairValue_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_AvailableForSaleSecuritiesUnrealizedGainsFairValue_lbl" xml:lang="en-US">Investments with unrealized gains, Fair Value</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_AvailableForSaleSecuritiesUnrealizedHoldingGainsLessThanTwelveMonths" xlink:label="CLSN_AvailableForSaleSecuritiesUnrealizedHoldingGainsLessThanTwelveMonths" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_AvailableForSaleSecuritiesUnrealizedHoldingGainsLessThanTwelveMonths" xlink:to="CLSN_AvailableForSaleSecuritiesUnrealizedHoldingGainsLessThanTwelveMonths_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_AvailableForSaleSecuritiesUnrealizedHoldingGainsLessThanTwelveMonths_lbl" xml:lang="en-US">Investments with unrealized gains, Unrealized Holding Gains (Losses)</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_AvailableForSaleSecuritiesUnrealizedLossFairValue" xlink:label="CLSN_AvailableForSaleSecuritiesUnrealizedLossFairValue" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_AvailableForSaleSecuritiesUnrealizedLossFairValue" xlink:to="CLSN_AvailableForSaleSecuritiesUnrealizedLossFairValue_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_AvailableForSaleSecuritiesUnrealizedLossFairValue_lbl" xml:lang="en-US">Investments with unrealized losses, Fair Value</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_AvailableForSaleSecuritiesUnrealizedHoldingLossesLessThanTwelveMonths" xlink:label="CLSN_AvailableForSaleSecuritiesUnrealizedHoldingLossesLessThanTwelveMonths" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_AvailableForSaleSecuritiesUnrealizedHoldingLossesLessThanTwelveMonths" xlink:to="CLSN_AvailableForSaleSecuritiesUnrealizedHoldingLossesLessThanTwelveMonths_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_AvailableForSaleSecuritiesUnrealizedHoldingLossesLessThanTwelveMonths_lbl" xml:lang="en-US">Investments with unrealized Losses, Unrealized Holding Gains (Losses)</link:label>
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent_3_lbl" xml:lang="en-US">Investment securities, available for sale</link:label>
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      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet" xlink:label="us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet" />
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_lbl" xml:lang="en-US">Fair Value, Recurring and Nonrecurring [Table]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareLineItems" xlink:label="us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareLineItems" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareLineItems" xlink:to="us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareLineItems_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareLineItems_lbl" xml:lang="en-US">Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable" xlink:label="us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable" xlink:to="us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_lbl" xlink:type="arc" />
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      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems" xlink:label="us-gaap_FiniteLivedIntangibleAssetsLineItems" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FiniteLivedIntangibleAssetsLineItems" xlink:to="us-gaap_FiniteLivedIntangibleAssetsLineItems_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FiniteLivedIntangibleAssetsLineItems_lbl" xml:lang="en-US">Finite-Lived Intangible Assets [Line Items]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FiniteLivedIntangibleAssetsNet" xlink:to="us-gaap_FiniteLivedIntangibleAssetsNet_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="us-gaap_FiniteLivedIntangibleAssetsNet_2_lbl" xml:lang="en-US">Intangible assets, beginning balance</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AmortizationOfIntangibleAssets" xlink:label="us-gaap_AmortizationOfIntangibleAssets" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AmortizationOfIntangibleAssets" xlink:to="us-gaap_AmortizationOfIntangibleAssets_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_AmortizationOfIntangibleAssets_lbl" xml:lang="en-US">Amortization</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FiniteLivedIntangibleAssetsNet" xlink:to="us-gaap_FiniteLivedIntangibleAssetsNet_3_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="us-gaap_FiniteLivedIntangibleAssetsNet_3_lbl" xml:lang="en-US">Intangible assets, ending balance</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable" xlink:label="us-gaap_ScheduleOfRestructuringAndRelatedCostsTable" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ScheduleOfRestructuringAndRelatedCostsTable" xlink:to="us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_lbl" xml:lang="en-US">Schedule of Restructuring and Related Costs [Table]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AcquiredIndefiniteLivedIntangibleAssetsLineItems" xlink:label="us-gaap_AcquiredIndefiniteLivedIntangibleAssetsLineItems" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AcquiredIndefiniteLivedIntangibleAssetsLineItems" xlink:to="us-gaap_AcquiredIndefiniteLivedIntangibleAssetsLineItems_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AcquiredIndefiniteLivedIntangibleAssetsLineItems_lbl" xml:lang="en-US">Acquired Indefinite-lived Intangible Assets [Line Items]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IndefinitelivedIntangibleAssetsAcquired" xlink:label="us-gaap_IndefinitelivedIntangibleAssetsAcquired" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IndefinitelivedIntangibleAssetsAcquired" xlink:to="us-gaap_IndefinitelivedIntangibleAssetsAcquired_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_IndefinitelivedIntangibleAssetsAcquired_lbl" xml:lang="en-US">Indefinite-lived Intangible Assets Acquired</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FinitelivedIntangibleAssetsAcquired1" xlink:label="us-gaap_FinitelivedIntangibleAssetsAcquired1" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FinitelivedIntangibleAssetsAcquired1" xlink:to="us-gaap_FinitelivedIntangibleAssetsAcquired1_lbl" xlink:type="arc" />
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      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AssetImpairmentCharges" xlink:label="us-gaap_AssetImpairmentCharges" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AssetImpairmentCharges" xlink:to="us-gaap_AssetImpairmentCharges_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AssetImpairmentCharges_lbl" xml:lang="en-US">Asset Impairment Charges</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_NoncashCharge" xlink:label="CLSN_NoncashCharge" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_NoncashCharge" xlink:to="CLSN_NoncashCharge_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_NoncashCharge_lbl" xml:lang="en-US">[custom:NoncashCharge]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetUsefulLife" xlink:label="us-gaap_FiniteLivedIntangibleAssetUsefulLife" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FiniteLivedIntangibleAssetUsefulLife" xlink:to="us-gaap_FiniteLivedIntangibleAssetUsefulLife_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FiniteLivedIntangibleAssetUsefulLife_lbl" xml:lang="en-US">Finite-Lived Intangible Asset, Useful Life</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AdjustmentForAmortization" xlink:label="us-gaap_AdjustmentForAmortization" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AdjustmentForAmortization" xlink:to="us-gaap_AdjustmentForAmortization_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AdjustmentForAmortization_lbl" xml:lang="en-US">Amortization</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FiniteLivedIntangibleAssetsNet" xlink:to="us-gaap_FiniteLivedIntangibleAssetsNet_4_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_FiniteLivedIntangibleAssetsNet_4_lbl" xml:lang="en-US">Finite-Lived Intangible Assets, Net</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization" xlink:label="us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization" xlink:to="us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_lbl" xml:lang="en-US">Finite-Lived Intangible Assets, Accumulated Amortization</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GoodwillAcquiredDuringPeriod" xlink:label="us-gaap_GoodwillAcquiredDuringPeriod" />
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      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ContractualObligation" xlink:label="us-gaap_ContractualObligation" />
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ContractualObligation_lbl" xml:lang="en-US">Amounts due to contract research organizations and other contractual agreements</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EmployeeRelatedLiabilitiesCurrent" xlink:label="us-gaap_EmployeeRelatedLiabilitiesCurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_EmployeeRelatedLiabilitiesCurrent" xlink:to="us-gaap_EmployeeRelatedLiabilitiesCurrent_lbl" xlink:type="arc" />
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      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccruedProfessionalFeesCurrent" xlink:label="us-gaap_AccruedProfessionalFeesCurrent" />
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      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InterestPayableCurrent" xlink:label="us-gaap_InterestPayableCurrent" />
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      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherAccruedLiabilitiesCurrent" xlink:label="us-gaap_OtherAccruedLiabilitiesCurrent" />
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OtherAccruedLiabilitiesCurrent_lbl" xml:lang="en-US">Other</link:label>
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_AccruedLiabilitiesCurrent_2_lbl" xml:lang="en-US">Total</link:label>
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      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths" xlink:to="us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths_lbl" xml:lang="en-US">2022</link:label>
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      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_LongTermDebtMaturitiesRepaymentsOfPrincipalYearFourAndThereAfter" xlink:to="CLSN_LongTermDebtMaturitiesRepaymentsOfPrincipalYearFourAndThereAfter_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_LongTermDebtMaturitiesRepaymentsOfPrincipalYearFourAndThereAfter_lbl" xml:lang="en-US">2025 and thereafter</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentCarryingAmount" xlink:label="us-gaap_DebtInstrumentCarryingAmount" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DebtInstrumentCarryingAmount" xlink:to="us-gaap_DebtInstrumentCarryingAmount_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_DebtInstrumentCarryingAmount_lbl" xml:lang="en-US">Subtotal of future principal payments</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredFinanceCostsNet" xlink:label="us-gaap_DeferredFinanceCostsNet" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DeferredFinanceCostsNet" xlink:to="us-gaap_DeferredFinanceCostsNet_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_DeferredFinanceCostsNet_lbl" xml:lang="en-US">Unamortized debt premium, net</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongTermDebt" xlink:label="us-gaap_LongTermDebt" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LongTermDebt" xlink:to="us-gaap_LongTermDebt_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_LongTermDebt_lbl" xml:lang="en-US">Total</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityListingsLineItems" xlink:label="dei_EntityListingsLineItems" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityListingsLineItems" xlink:to="dei_EntityListingsLineItems_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityListingsLineItems_lbl" xml:lang="en-US">Entity Listings [Line Items]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LineOfCredit" xlink:label="us-gaap_LineOfCredit" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LineOfCredit" xlink:to="us-gaap_LineOfCredit_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="us-gaap_LineOfCredit_lbl" xml:lang="en-US">Line of credit, beginning balance</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_EarlyTerminationFees" xlink:label="CLSN_EarlyTerminationFees" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_EarlyTerminationFees" xlink:to="CLSN_EarlyTerminationFees_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_EarlyTerminationFees_lbl" xml:lang="en-US">Early termination fees</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_EndOfTermFees" xlink:label="CLSN_EndOfTermFees" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_EndOfTermFees" xlink:to="CLSN_EndOfTermFees_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_EndOfTermFees_lbl" xml:lang="en-US">End of term charges</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LineOfCredit" xlink:to="us-gaap_LineOfCredit_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="us-gaap_LineOfCredit_2_lbl" xml:lang="en-US">Line of credit, ending balance</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfShortTermDebtTable" xlink:label="us-gaap_ScheduleOfShortTermDebtTable" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ScheduleOfShortTermDebtTable" xlink:to="us-gaap_ScheduleOfShortTermDebtTable_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ScheduleOfShortTermDebtTable_lbl" xml:lang="en-US">Schedule of Short-term Debt [Table]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShortTermDebtLineItems" xlink:label="us-gaap_ShortTermDebtLineItems" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShortTermDebtLineItems" xlink:to="us-gaap_ShortTermDebtLineItems_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShortTermDebtLineItems_lbl" xml:lang="en-US">Short-term Debt [Line Items]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProceedsFromLinesOfCredit" xlink:label="us-gaap_ProceedsFromLinesOfCredit" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ProceedsFromLinesOfCredit" xlink:to="us-gaap_ProceedsFromLinesOfCredit_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ProceedsFromLinesOfCredit_lbl" xml:lang="en-US">Proceeds from Lines of Credit</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestrictedCash" xlink:label="us-gaap_RestrictedCash" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RestrictedCash" xlink:to="us-gaap_RestrictedCash_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_RestrictedCash_lbl" xml:lang="en-US">Restricted cash</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_FinalPaymentPercentage" xlink:label="CLSN_FinalPaymentPercentage" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_FinalPaymentPercentage" xlink:to="CLSN_FinalPaymentPercentage_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_FinalPaymentPercentage_lbl" xml:lang="en-US">Final payment percentage</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LineOfCredit" xlink:to="us-gaap_LineOfCredit_3_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LineOfCredit_3_lbl" xml:lang="en-US">Long-term Line of Credit</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LineOfCreditFacilityCommitmentFeeAmount" xlink:label="us-gaap_LineOfCreditFacilityCommitmentFeeAmount" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LineOfCreditFacilityCommitmentFeeAmount" xlink:to="us-gaap_LineOfCreditFacilityCommitmentFeeAmount_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LineOfCreditFacilityCommitmentFeeAmount_lbl" xml:lang="en-US">Line of Credit Facility, Commitment Fee Amount</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtConversionConvertedInstrumentWarrantsOrOptionsIssued1" xlink:label="us-gaap_DebtConversionConvertedInstrumentWarrantsOrOptionsIssued1" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DebtConversionConvertedInstrumentWarrantsOrOptionsIssued1" xlink:to="us-gaap_DebtConversionConvertedInstrumentWarrantsOrOptionsIssued1_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DebtConversionConvertedInstrumentWarrantsOrOptionsIssued1_lbl" xml:lang="en-US">Debt Conversion, Converted Instrument, Warrants or Options Issued</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InterestAndDebtExpense" xlink:to="us-gaap_InterestAndDebtExpense_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InterestAndDebtExpense_2_lbl" xml:lang="en-US">Interest and Debt Expense</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_EndOfTermChargePercentage" xlink:label="CLSN_EndOfTermChargePercentage" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_EndOfTermChargePercentage" xlink:to="CLSN_EndOfTermChargePercentage_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_EndOfTermChargePercentage_lbl" xml:lang="en-US">End of term charge percentage</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AmortizationOfFinancingCosts" xlink:label="us-gaap_AmortizationOfFinancingCosts" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AmortizationOfFinancingCosts" xlink:to="us-gaap_AmortizationOfFinancingCosts_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AmortizationOfFinancingCosts_lbl" xml:lang="en-US">Amortization of Debt Issuance Costs</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InterestExpenseDebt" xlink:label="us-gaap_InterestExpenseDebt" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InterestExpenseDebt" xlink:to="us-gaap_InterestExpenseDebt_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InterestExpenseDebt_lbl" xml:lang="en-US">Interest Expense, Debt</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AmortizationOfFinancingCostsAndDiscounts" xlink:label="us-gaap_AmortizationOfFinancingCostsAndDiscounts" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AmortizationOfFinancingCostsAndDiscounts" xlink:to="us-gaap_AmortizationOfFinancingCostsAndDiscounts_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AmortizationOfFinancingCostsAndDiscounts_lbl" xml:lang="en-US">Amortization of Debt Issuance Costs and Discounts</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentInterestRateTerms" xlink:label="us-gaap_DebtInstrumentInterestRateTerms" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DebtInstrumentInterestRateTerms" xlink:to="us-gaap_DebtInstrumentInterestRateTerms_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DebtInstrumentInterestRateTerms_lbl" xml:lang="en-US">Debt Instrument, Interest Rate Terms</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentFeeAmount" xlink:label="us-gaap_DebtInstrumentFeeAmount" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DebtInstrumentFeeAmount" xlink:to="us-gaap_DebtInstrumentFeeAmount_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DebtInstrumentFeeAmount_lbl" xml:lang="en-US">Debt Instrument, Fee Amount</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentRestrictiveCovenants" xlink:label="us-gaap_DebtInstrumentRestrictiveCovenants" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DebtInstrumentRestrictiveCovenants" xlink:to="us-gaap_DebtInstrumentRestrictiveCovenants_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DebtInstrumentRestrictiveCovenants_lbl" xml:lang="en-US">Debt Instrument, Restrictive Covenants</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LoanProcessingFee" xlink:label="us-gaap_LoanProcessingFee" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LoanProcessingFee" xlink:to="us-gaap_LoanProcessingFee_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LoanProcessingFee_lbl" xml:lang="en-US">Loan Processing Fee</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentUnamortizedDiscount" xlink:label="us-gaap_DebtInstrumentUnamortizedDiscount" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DebtInstrumentUnamortizedDiscount" xlink:to="us-gaap_DebtInstrumentUnamortizedDiscount_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DebtInstrumentUnamortizedDiscount_lbl" xml:lang="en-US">Debt Instrument, Unamortized Discount</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DeferredFinanceCostsNet" xlink:to="us-gaap_DeferredFinanceCostsNet_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DeferredFinanceCostsNet_2_lbl" xml:lang="en-US">Debt Issuance Costs, Net</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights" xlink:label="us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights" xlink:to="us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights_lbl" xml:lang="en-US">Class of Warrant or Right, Number of Securities Called by Warrants or Rights</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueAdjustmentOfWarrants" xlink:label="us-gaap_FairValueAdjustmentOfWarrants" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueAdjustmentOfWarrants" xlink:to="us-gaap_FairValueAdjustmentOfWarrants_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FairValueAdjustmentOfWarrants_lbl" xml:lang="en-US">Fair Value Adjustment of Warrants</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_ClassOfWarrantOrRightWarrantsOrRightsCancelled" xlink:label="CLSN_ClassOfWarrantOrRightWarrantsOrRightsCancelled" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_ClassOfWarrantOrRightWarrantsOrRightsCancelled" xlink:to="CLSN_ClassOfWarrantOrRightWarrantsOrRightsCancelled_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_ClassOfWarrantOrRightWarrantsOrRightsCancelled_lbl" xml:lang="en-US">Warrants cancelled</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ClassOfWarrantOrRightOutstanding" xlink:label="us-gaap_ClassOfWarrantOrRightOutstanding" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ClassOfWarrantOrRightOutstanding" xlink:to="us-gaap_ClassOfWarrantOrRightOutstanding_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ClassOfWarrantOrRightOutstanding_lbl" xml:lang="en-US">Class of Warrant or Right, Outstanding</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PaymentsOfDebtExtinguishmentCosts" xlink:label="us-gaap_PaymentsOfDebtExtinguishmentCosts" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PaymentsOfDebtExtinguishmentCosts" xlink:to="us-gaap_PaymentsOfDebtExtinguishmentCosts_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PaymentsOfDebtExtinguishmentCosts_lbl" xml:lang="en-US">Payment for Debt Extinguishment or Debt Prepayment Cost</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_WarrantsNotSettleableInCashFairValueDisclosure" xlink:label="us-gaap_WarrantsNotSettleableInCashFairValueDisclosure" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_WarrantsNotSettleableInCashFairValueDisclosure" xlink:to="us-gaap_WarrantsNotSettleableInCashFairValueDisclosure_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_WarrantsNotSettleableInCashFairValueDisclosure_lbl" xml:lang="en-US">Warrants Not Settleable in Cash, Fair Value Disclosure</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_EndOfTermFees" xlink:to="CLSN_EndOfTermFees_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="CLSN_EndOfTermFees_2_lbl" xml:lang="en-US">[custom:EndOfTermFees]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GainLossOnContractTermination" xlink:label="us-gaap_GainLossOnContractTermination" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_GainLossOnContractTermination" xlink:to="us-gaap_GainLossOnContractTermination_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_GainLossOnContractTermination_lbl" xml:lang="en-US">Gain (Loss) on Contract Termination</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossTable" xlink:label="us-gaap_AccumulatedOtherComprehensiveIncomeLossTable" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AccumulatedOtherComprehensiveIncomeLossTable" xlink:to="us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_lbl" xml:lang="en-US">Accumulated Other Comprehensive Income (Loss) [Table]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems" xlink:label="us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems" xlink:to="us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_lbl" xml:lang="en-US">Accumulated Other Comprehensive Income (Loss) [Line Items]</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_ShelfRegistrationStatementAmount" xlink:label="CLSN_ShelfRegistrationStatementAmount" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_ShelfRegistrationStatementAmount" xlink:to="CLSN_ShelfRegistrationStatementAmount_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_ShelfRegistrationStatementAmount_lbl" xml:lang="en-US">clsn_ShelfRegistrationStatementAmount</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_AggregateOfferingPrices" xlink:label="CLSN_AggregateOfferingPrices" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_AggregateOfferingPrices" xlink:to="CLSN_AggregateOfferingPrices_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_AggregateOfferingPrices_lbl" xml:lang="en-US">Less than 12 months, unrealized gains, fair value</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssuedDuringPeriodSharesNewIssues" xlink:to="us-gaap_StockIssuedDuringPeriodSharesNewIssues_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_StockIssuedDuringPeriodSharesNewIssues_2_lbl" xml:lang="en-US">Stock Issued During Period, Shares, New Issues</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ProceedsFromIssuanceOfCommonStock" xlink:to="us-gaap_ProceedsFromIssuanceOfCommonStock_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_ProceedsFromIssuanceOfCommonStock_2_lbl" xml:lang="en-US">Proceeds from Issuance of Common Stock</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SharesIssuedPricePerShare" xlink:label="us-gaap_SharesIssuedPricePerShare" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SharesIssuedPricePerShare" xlink:to="us-gaap_SharesIssuedPricePerShare_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SharesIssuedPricePerShare_lbl" xml:lang="en-US">Shares Issued, Price Per Share</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight" xlink:label="us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight" xlink:to="us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight_lbl" xml:lang="en-US">Class of Warrant or Right, Number of Securities Called by Each Warrant or Right</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_WarrantsAndRightsOutstandingTerm" xlink:label="us-gaap_WarrantsAndRightsOutstandingTerm" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_WarrantsAndRightsOutstandingTerm" xlink:to="us-gaap_WarrantsAndRightsOutstandingTerm_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_WarrantsAndRightsOutstandingTerm_lbl" xml:lang="en-US">Warrants and Rights Outstanding, Term</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProceedsFromIssuanceOfWarrants" xlink:label="us-gaap_ProceedsFromIssuanceOfWarrants" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ProceedsFromIssuanceOfWarrants" xlink:to="us-gaap_ProceedsFromIssuanceOfWarrants_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ProceedsFromIssuanceOfWarrants_lbl" xml:lang="en-US">Proceeds from Issuance of Warrants</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SharePrice" xlink:label="us-gaap_SharePrice" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SharePrice" xlink:to="us-gaap_SharePrice_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SharePrice_lbl" xml:lang="en-US">Share Price</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_UnderwritingDiscountPricePerShare" xlink:label="CLSN_UnderwritingDiscountPricePerShare" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_UnderwritingDiscountPricePerShare" xlink:to="CLSN_UnderwritingDiscountPricePerShare_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_UnderwritingDiscountPricePerShare_lbl" xml:lang="en-US">[custom:UnderwritingDiscountPricePerShare]</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_PercentageOfUnderwritingDiscountOnPublicOfferingPrice" xlink:label="CLSN_PercentageOfUnderwritingDiscountOnPublicOfferingPrice" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_PercentageOfUnderwritingDiscountOnPublicOfferingPrice" xlink:to="CLSN_PercentageOfUnderwritingDiscountOnPublicOfferingPrice_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_PercentageOfUnderwritingDiscountOnPublicOfferingPrice_lbl" xml:lang="en-US">Payments from sale of nols</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_PlacementAgentFeeDescription" xlink:label="CLSN_PlacementAgentFeeDescription" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_PlacementAgentFeeDescription" xlink:to="CLSN_PlacementAgentFeeDescription_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_PlacementAgentFeeDescription_lbl" xml:lang="en-US">Placement agent fee description.</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:to="us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_lbl" xml:lang="en-US">Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_lbl" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award [Line Items]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_lbl" xml:lang="en-US">Number Outstanding, Outstanding, Beginning balance</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_lbl" xml:lang="en-US">Weighted Average Exercise Price, Outstanding, Beginning balance</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_lbl" xml:lang="en-US">Number Outstanding, Non-vested stock awards, Outstanding, Beginning balance</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_lbl" xml:lang="en-US">Weighted Average Grant Date Fair Value, Non-vested stock awards, Outstanding, Beginning balance</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod_lbl" xml:lang="en-US">Number Outstanding, Options granted</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice" xlink:to="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_lbl" xml:lang="en-US">Weighted Average Exercise Price, Options granted</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_lbl" xml:lang="en-US">Number Outstanding, Non-vested stock awards, Granted</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_lbl" xml:lang="en-US">Weighted Average Grant Date Fair Value, Non-vested stock awards, Granted</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised" xlink:to="us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_2_lbl" xml:lang="en-US">Number Outstanding, Options exercised or vested and issued</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice" xlink:to="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_lbl" xml:lang="en-US">Weighted Average Exercise Price, Options exercised or vested and issued</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_lbl" xml:lang="en-US">Number Outstanding, Non-vested stock awards, exercised or vested and issued</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_lbl" xlink:type="arc" />
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_lbl" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term</link:label>
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      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding" xlink:to="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding_lbl" xml:lang="en-US">Aggregate Intrinsic Value, Non-vested stock awards, Outstanding, Ending balance</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber" />
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      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1" />
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_lbl" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1" />
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1_lbl" xml:lang="en-US">Aggregate Intrinsic Value, Exercisable, Ending balance</link:label>
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum_lbl" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum</link:label>
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_2_lbl" xml:lang="en-US">Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_lbl" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockCapitalSharesReservedForFutureIssuance" xlink:label="us-gaap_CommonStockCapitalSharesReservedForFutureIssuance" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CommonStockCapitalSharesReservedForFutureIssuance" xlink:to="us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_lbl" xml:lang="en-US">Common Stock, Capital Shares Reserved for Future Issuance</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AllocatedShareBasedCompensationExpense" xlink:label="us-gaap_AllocatedShareBasedCompensationExpense" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AllocatedShareBasedCompensationExpense" xlink:to="us-gaap_AllocatedShareBasedCompensationExpense_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AllocatedShareBasedCompensationExpense_lbl" xml:lang="en-US">Share-based Payment Arrangement, Expense</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized" xlink:label="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized" xlink:to="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_lbl" xml:lang="en-US">Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1" xlink:label="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1" xlink:to="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_lbl" xml:lang="en-US">Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_DisclosureEarnoutMilestoneLiabilityAbstract" xlink:to="CLSN_DisclosureEarnoutMilestoneLiabilityAbstract_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="CLSN_DisclosureEarnoutMilestoneLiabilityAbstract_2_lbl" xml:lang="en-US">Schedule Of Changes In Earn-out Milestone Liability</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_EarnoutMilestoneLiability" xlink:label="CLSN_EarnoutMilestoneLiability" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_EarnoutMilestoneLiability" xlink:to="CLSN_EarnoutMilestoneLiability_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="CLSN_EarnoutMilestoneLiability_lbl" xml:lang="en-US">Earn-out liabilities, beginning balance</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_GainLossFromChangeInFairValueOfEarnOutMilestoneLiability" xlink:label="CLSN_GainLossFromChangeInFairValueOfEarnOutMilestoneLiability" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_GainLossFromChangeInFairValueOfEarnOutMilestoneLiability" xlink:to="CLSN_GainLossFromChangeInFairValueOfEarnOutMilestoneLiability_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_GainLossFromChangeInFairValueOfEarnOutMilestoneLiability_lbl" xml:lang="en-US">Non-cash gain loss from the adjustment for the change in fair value</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_EarnoutMilestoneLiability" xlink:to="CLSN_EarnoutMilestoneLiability_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="CLSN_EarnoutMilestoneLiability_2_lbl" xml:lang="en-US">Earn-out liabilities, ending balance</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersLineItems" xlink:label="srt_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersLineItems" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="srt_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersLineItems" xlink:to="srt_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersLineItems_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="srt_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersLineItems_lbl" xml:lang="en-US">SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters [Line Items]</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_RiskadjustmentAssessmentOfAchievingMilestone" xlink:label="CLSN_RiskadjustmentAssessmentOfAchievingMilestone" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_RiskadjustmentAssessmentOfAchievingMilestone" xlink:to="CLSN_RiskadjustmentAssessmentOfAchievingMilestone_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_RiskadjustmentAssessmentOfAchievingMilestone_lbl" xml:lang="en-US">Risk-adjustment Assessment of achieving each Milestone</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_DiscountRatesOnMileStoneLiabilities" xlink:label="CLSN_DiscountRatesOnMileStoneLiabilities" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_DiscountRatesOnMileStoneLiabilities" xlink:to="CLSN_DiscountRatesOnMileStoneLiabilities_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_DiscountRatesOnMileStoneLiabilities_lbl" xml:lang="en-US">Discount Rate</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_EstimatedTimeToAchieveMileStone" xlink:label="CLSN_EstimatedTimeToAchieveMileStone" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_EstimatedTimeToAchieveMileStone" xlink:to="CLSN_EstimatedTimeToAchieveMileStone_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_EstimatedTimeToAchieveMileStone_lbl" xml:lang="en-US">[custom:EstimatedTimeToAchieveMileStone]</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_EarnoutMilestoneLiability1" xlink:label="CLSN_EarnoutMilestoneLiability1" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_EarnoutMilestoneLiability1" xlink:to="CLSN_EarnoutMilestoneLiability1_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_EarnoutMilestoneLiability1_lbl" xml:lang="en-US">Earnout milestone liability</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred" xlink:label="us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred" xlink:to="us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred_lbl" xml:lang="en-US">Business Combination, Consideration Transferred, Liabilities Incurred</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_NoncashChargeOnEarnoutMilestoneLiability" xlink:label="CLSN_NoncashChargeOnEarnoutMilestoneLiability" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_NoncashChargeOnEarnoutMilestoneLiability" xlink:to="CLSN_NoncashChargeOnEarnoutMilestoneLiability_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_NoncashChargeOnEarnoutMilestoneLiability_lbl" xml:lang="en-US">Non-cash charge on earnout milestone liability</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_EarnoutPaymentOptionsDescription" xlink:label="CLSN_EarnoutPaymentOptionsDescription" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_EarnoutPaymentOptionsDescription" xlink:to="CLSN_EarnoutPaymentOptionsDescription_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_EarnoutPaymentOptionsDescription_lbl" xml:lang="en-US">[custom:EarnoutPaymentOptionsDescription]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_DisclosureWarrantsAbstract" xlink:to="CLSN_DisclosureWarrantsAbstract_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="CLSN_DisclosureWarrantsAbstract_2_lbl" xml:lang="en-US">Summary Of Warrant Activity</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber_lbl" xml:lang="en-US">Number of Warrants Issued, Warrants outstanding, Beginning balance</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingWeightedAverageExercisePrice" xlink:label="CLSN_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingWeightedAverageExercisePrice" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingWeightedAverageExercisePrice" xlink:to="CLSN_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingWeightedAverageExercisePrice_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="CLSN_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingWeightedAverageExercisePrice_lbl" xml:lang="en-US">Weighted Average Exercise Price, Warrants outstanding, Beginning balance</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised_lbl" xml:lang="en-US">Number of Warrants Issued, Warrants exercised</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExerciseInPeriodWeightedAverageExercisePrice" xlink:label="CLSN_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExerciseInPeriodWeightedAverageExercisePrice" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExerciseInPeriodWeightedAverageExercisePrice" xlink:to="CLSN_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExerciseInPeriodWeightedAverageExercisePrice_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExerciseInPeriodWeightedAverageExercisePrice_lbl" xml:lang="en-US">Weighted Average Exercise Price, Warrants exercised</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber_2_lbl" xml:lang="en-US">Number of Warrants Issued, Warrants outstanding, Ending balance</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingWeightedAverageExercisePrice" xlink:to="CLSN_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingWeightedAverageExercisePrice_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="CLSN_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingWeightedAverageExercisePrice_2_lbl" xml:lang="en-US">Weighted Average Exercise Price, Warrants outstanding, Ending balance</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionsOutstandingIntrinsicValue" xlink:label="CLSN_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionsOutstandingIntrinsicValue" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionsOutstandingIntrinsicValue" xlink:to="CLSN_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionsOutstandingIntrinsicValue_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="CLSN_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionsOutstandingIntrinsicValue_lbl" xml:lang="en-US">Aggregate intrinsic value of outstanding warrants</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_SharebasedCompensationArrangementBySharebasedPaymentAwardNonOptionsOutstandingWeightedAverageRemainingContractualTerm2" xlink:label="CLSN_SharebasedCompensationArrangementBySharebasedPaymentAwardNonOptionsOutstandingWeightedAverageRemainingContractualTerm2" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_SharebasedCompensationArrangementBySharebasedPaymentAwardNonOptionsOutstandingWeightedAverageRemainingContractualTerm2" xlink:to="CLSN_SharebasedCompensationArrangementBySharebasedPaymentAwardNonOptionsOutstandingWeightedAverageRemainingContractualTerm2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_SharebasedCompensationArrangementBySharebasedPaymentAwardNonOptionsOutstandingWeightedAverageRemainingContractualTerm2_lbl" xml:lang="en-US">Weighted average remaining contractual terms (years)</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_DisclosureLeasesAbstract" xlink:to="CLSN_DisclosureLeasesAbstract_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="CLSN_DisclosureLeasesAbstract_2_lbl" xml:lang="en-US">Schedule Of Lease Payments And Maturity Of Operating Lease Liabilities</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths" xlink:to="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_lbl" xml:lang="en-US">Remainder of 2021</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo" xlink:to="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_lbl" xml:lang="en-US">2022</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree" xlink:to="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_lbl" xml:lang="en-US">2023</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearThreeAndThereAfter" xlink:label="CLSN_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearThreeAndThereAfter" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearThreeAndThereAfter" xlink:to="CLSN_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearThreeAndThereAfter_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearThreeAndThereAfter_lbl" xml:lang="en-US">2024 and thereafter</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue" xlink:to="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_lbl" xml:lang="en-US">Subtotal future lease payments</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_OperatingLeaseImputedInterest" xlink:label="CLSN_OperatingLeaseImputedInterest" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_OperatingLeaseImputedInterest" xlink:to="CLSN_OperatingLeaseImputedInterest_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="CLSN_OperatingLeaseImputedInterest_lbl" xml:lang="en-US">Less imputed interest</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingLeaseLiability" xlink:label="us-gaap_OperatingLeaseLiability" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OperatingLeaseLiability" xlink:to="us-gaap_OperatingLeaseLiability_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OperatingLeaseLiability_lbl" xml:lang="en-US">Total lease liabilities</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1" xlink:label="us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1" xlink:to="us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_lbl" xml:lang="en-US">Operating Lease, Weighted Average Remaining Lease Term</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent" xlink:label="us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent" xlink:to="us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_lbl" xml:lang="en-US">Operating Lease, Weighted Average Discount Rate, Percent</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MortgageLoansOnRealEstateLineItems" xlink:label="srt_MortgageLoansOnRealEstateLineItems" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="srt_MortgageLoansOnRealEstateLineItems" xlink:to="srt_MortgageLoansOnRealEstateLineItems_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="srt_MortgageLoansOnRealEstateLineItems_lbl" xml:lang="en-US">SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LesseeOperatingLeaseDescription" xlink:label="us-gaap_LesseeOperatingLeaseDescription" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LesseeOperatingLeaseDescription" xlink:to="us-gaap_LesseeOperatingLeaseDescription_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LesseeOperatingLeaseDescription_lbl" xml:lang="en-US">Lessee, Operating Lease, Description</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AreaOfLand" xlink:label="us-gaap_AreaOfLand" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AreaOfLand" xlink:to="us-gaap_AreaOfLand_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AreaOfLand_lbl" xml:lang="en-US">Area of Land</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LesseeOperatingLeaseTermOfContract" xlink:label="us-gaap_LesseeOperatingLeaseTermOfContract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LesseeOperatingLeaseTermOfContract" xlink:to="us-gaap_LesseeOperatingLeaseTermOfContract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LesseeOperatingLeaseTermOfContract_lbl" xml:lang="en-US">Lessee, Operating Lease, Term of Contract</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LeaseExpirationDate1" xlink:label="us-gaap_LeaseExpirationDate1" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LeaseExpirationDate1" xlink:to="us-gaap_LeaseExpirationDate1_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LeaseExpirationDate1_lbl" xml:lang="en-US">Lease Expiration Date</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PaymentsForRent" xlink:label="us-gaap_PaymentsForRent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PaymentsForRent" xlink:to="us-gaap_PaymentsForRent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PaymentsForRent_lbl" xml:lang="en-US">Payments for Rent</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OperatingLeaseRightOfUseAsset" xlink:to="us-gaap_OperatingLeaseRightOfUseAsset_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_OperatingLeaseRightOfUseAsset_2_lbl" xml:lang="en-US">Operating Lease, Right-of-Use Asset</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OperatingLeaseLiability" xlink:to="us-gaap_OperatingLeaseLiability_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_OperatingLeaseLiability_2_lbl" xml:lang="en-US">Operating Lease, Liability</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherLiabilities" xlink:label="us-gaap_OtherLiabilities" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OtherLiabilities" xlink:to="us-gaap_OtherLiabilities_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OtherLiabilities_lbl" xml:lang="en-US">Other Liabilities</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability" xlink:label="us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability" xlink:to="us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability_lbl" xml:lang="en-US">Right-of-Use Asset Obtained in Exchange for Operating Lease Liability</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingLeaseCost" xlink:label="us-gaap_OperatingLeaseCost" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OperatingLeaseCost" xlink:to="us-gaap_OperatingLeaseCost_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OperatingLeaseCost_lbl" xml:lang="en-US">Operating Lease, Cost</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OperatingLeasePayments" xlink:to="us-gaap_OperatingLeasePayments_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_OperatingLeasePayments_2_lbl" xml:lang="en-US">Operating Lease, Payments</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable" xlink:label="us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable" xlink:to="us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_lbl" xml:lang="en-US">Schedule of Accounts, Notes, Loans and Financing Receivable [Table]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccountsNotesAndLoansReceivableLineItems" xlink:label="us-gaap_AccountsNotesAndLoansReceivableLineItems" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AccountsNotesAndLoansReceivableLineItems" xlink:to="us-gaap_AccountsNotesAndLoansReceivableLineItems_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AccountsNotesAndLoansReceivableLineItems_lbl" xml:lang="en-US">Accounts, Notes, Loans and Financing Receivable [Line Items]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProceedsFromLicenseFeesReceived" xlink:label="us-gaap_ProceedsFromLicenseFeesReceived" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ProceedsFromLicenseFeesReceived" xlink:to="us-gaap_ProceedsFromLicenseFeesReceived_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ProceedsFromLicenseFeesReceived_lbl" xml:lang="en-US">Proceeds from License Fees Received</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredRevenue" xlink:label="us-gaap_DeferredRevenue" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DeferredRevenue" xlink:to="us-gaap_DeferredRevenue_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DeferredRevenue_lbl" xml:lang="en-US">Deferred Revenue</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_DeferredRevenueAmortizationPeriod" xlink:label="CLSN_DeferredRevenueAmortizationPeriod" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_DeferredRevenueAmortizationPeriod" xlink:to="CLSN_DeferredRevenueAmortizationPeriod_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_DeferredRevenueAmortizationPeriod_lbl" xml:lang="en-US">clsn_DeferredRevenueAmortizationPeriod</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_UpfrontPaymentBeingRecognized" xlink:label="CLSN_UpfrontPaymentBeingRecognized" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_UpfrontPaymentBeingRecognized" xlink:to="CLSN_UpfrontPaymentBeingRecognized_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_UpfrontPaymentBeingRecognized_lbl" xml:lang="en-US">[custom:UpfrontPaymentBeingRecognized]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LitigationSettlementExpense" xlink:label="us-gaap_LitigationSettlementExpense" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LitigationSettlementExpense" xlink:to="us-gaap_LitigationSettlementExpense_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LitigationSettlementExpense_lbl" xml:lang="en-US">Litigation Settlement, Expense</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PaymentsForLegalSettlements" xlink:label="us-gaap_PaymentsForLegalSettlements" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PaymentsForLegalSettlements" xlink:to="us-gaap_PaymentsForLegalSettlements_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PaymentsForLegalSettlements_lbl" xml:lang="en-US">Payments for Legal Settlements</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_GainLossFromChangeInEarnoutMilestoneLiability" xlink:to="CLSN_GainLossFromChangeInEarnoutMilestoneLiability_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_GainLossFromChangeInEarnoutMilestoneLiability_doc" xml:lang="en-US">Gain (loss) from change in valuation of earn-out milestone liability.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_AmortizationOfDeferredFinanceChargesAndDebtDiscountAssociatedWithNotePayable" xlink:to="CLSN_AmortizationOfDeferredFinanceChargesAndDebtDiscountAssociatedWithNotePayable_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_AmortizationOfDeferredFinanceChargesAndDebtDiscountAssociatedWithNotePayable_doc" xml:lang="en-US">Amortization of deferred finance charges and debt discount associated with note payable.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_ProceedsFromIssuanceOfCommonStockUponConversionOfStockOptions" xlink:to="CLSN_ProceedsFromIssuanceOfCommonStockUponConversionOfStockOptions_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_ProceedsFromIssuanceOfCommonStockUponConversionOfStockOptions_doc" xml:lang="en-US">Proceeds from issuance of common stock upon conversion of stock options.</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_EarlyTerminationAndEndOfTermFeePaidOnNotesPayable" xlink:label="CLSN_EarlyTerminationAndEndOfTermFeePaidOnNotesPayable" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_EarlyTerminationAndEndOfTermFeePaidOnNotesPayable" xlink:to="CLSN_EarlyTerminationAndEndOfTermFeePaidOnNotesPayable_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_EarlyTerminationAndEndOfTermFeePaidOnNotesPayable_doc" xml:lang="en-US">Early termination and end of term fee paid on notes payable.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_RealizedAndUnrealizedGainsAndLossesNetOnInvestmentInDebtSecurities" xlink:to="CLSN_RealizedAndUnrealizedGainsAndLossesNetOnInvestmentInDebtSecurities_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_RealizedAndUnrealizedGainsAndLossesNetOnInvestmentInDebtSecurities_doc" xml:lang="en-US">Realized and unrealized (gains) and losses, net, on investment in debt securities.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_StockIssuedUponExerciseOfCommonStockWarrants" xlink:to="CLSN_StockIssuedUponExerciseOfCommonStockWarrants_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_StockIssuedUponExerciseOfCommonStockWarrants_doc" xml:lang="en-US">Shares issued upon exercise of common stock warrants, net of fees.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_StockIssuedUponExerciseOfCommonStockWarrantsShares" xlink:to="CLSN_StockIssuedUponExerciseOfCommonStockWarrantsShares_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_StockIssuedUponExerciseOfCommonStockWarrantsShares_doc" xml:lang="en-US">Shares issued upon exercise of common stock warrants, net of fees, shares.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_IssuanceOfCommonStockUponExerciseOfOptions" xlink:to="CLSN_IssuanceOfCommonStockUponExerciseOfOptions_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_IssuanceOfCommonStockUponExerciseOfOptions_doc" xml:lang="en-US">Issuance of common stock upon exercise of options.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_IssuanceOfCommonStockUponExerciseOfOptionsShares" xlink:to="CLSN_IssuanceOfCommonStockUponExerciseOfOptionsShares_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_IssuanceOfCommonStockUponExerciseOfOptionsShares_doc" xml:lang="en-US">Issuance of common stock upon exercise of options, shares.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_CashAndCashEquivalentsRestrictedCashShorttermInvestmentsAndReceivableOnSaleOfNetOperatingLosses" xlink:to="CLSN_CashAndCashEquivalentsRestrictedCashShorttermInvestmentsAndReceivableOnSaleOfNetOperatingLosses_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_CashAndCashEquivalentsRestrictedCashShorttermInvestmentsAndReceivableOnSaleOfNetOperatingLosses_doc" xml:lang="en-US">Cash and cash equivalents, restricted cash short-term investments and receivable on sale of net operating losses.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_NetProceedsFromSaleOfNetOperatingLosses" xlink:to="CLSN_NetProceedsFromSaleOfNetOperatingLosses_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_NetProceedsFromSaleOfNetOperatingLosses_doc" xml:lang="en-US">Net proceeds from sale of net operating losses.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_NJMember" xlink:to="CLSN_NJMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_NJMember_doc" xml:lang="en-US">New Jersey [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_ReceivableOnSaleOfNetOperatingLosses" xlink:to="CLSN_ReceivableOnSaleOfNetOperatingLosses_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_ReceivableOnSaleOfNetOperatingLosses_doc" xml:lang="en-US">Receivable on sale of net operating losses.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_HorizonCreditAgreementMember" xlink:to="CLSN_HorizonCreditAgreementMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_HorizonCreditAgreementMember_doc" xml:lang="en-US">Horizon Credit Agreement [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_HorizonTechnologyFinanceCorporationMember" xlink:to="CLSN_HorizonTechnologyFinanceCorporationMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_HorizonTechnologyFinanceCorporationMember_doc" xml:lang="en-US">Horizon Technology Finance Corporation [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_AmendmentToHorizonCreditAgreementMember" xlink:to="CLSN_AmendmentToHorizonCreditAgreementMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_AmendmentToHorizonCreditAgreementMember_doc" xml:lang="en-US">Amendment to Horizon Credit Agreement [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_PaymentOfDebtEndTermCharges" xlink:to="CLSN_PaymentOfDebtEndTermCharges_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_PaymentOfDebtEndTermCharges_doc" xml:lang="en-US">Debt instrument related end term charges.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_SiliconValleyBankMember" xlink:to="CLSN_SiliconValleyBankMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_SiliconValleyBankMember_doc" xml:lang="en-US">Silicon Valley Bank [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_RepaymentOfOutstandingIndebtednessAmount" xlink:to="CLSN_RepaymentOfOutstandingIndebtednessAmount_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_RepaymentOfOutstandingIndebtednessAmount_doc" xml:lang="en-US">Repayment of outstanding indebtedness amount.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_SVBLoanFacilityMember" xlink:to="CLSN_SVBLoanFacilityMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_SVBLoanFacilityMember_doc" xml:lang="en-US">SVB Loan Facility [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_CapitalOnDemandTMSalesAgreementMember" xlink:to="CLSN_CapitalOnDemandTMSalesAgreementMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_CapitalOnDemandTMSalesAgreementMember_doc" xml:lang="en-US">Capital on DemandTM Sales Agreement [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_JonesTradingInstitutionalServicesLLCMember" xlink:to="CLSN_JonesTradingInstitutionalServicesLLCMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_JonesTradingInstitutionalServicesLLCMember_doc" xml:lang="en-US">Jones Trading Institutional Services, LLC [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_NumberOfSharesOfCommonStockIssuableUponExerciseOfWarrantsAndEquityAwards" xlink:to="CLSN_NumberOfSharesOfCommonStockIssuableUponExerciseOfWarrantsAndEquityAwards_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_NumberOfSharesOfCommonStockIssuableUponExerciseOfWarrantsAndEquityAwards_doc" xml:lang="en-US">Represents the total number of Shares of common stock issuable upon exercise of warrants and equity awards.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_NumberOfSharesOfCommonStockIssuedInCalculationBasicLossPerShare" xlink:to="CLSN_NumberOfSharesOfCommonStockIssuedInCalculationBasicLossPerShare_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_NumberOfSharesOfCommonStockIssuedInCalculationBasicLossPerShare_doc" xml:lang="en-US">Number of shares of common stock issued in calculation basic loss per share.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_GovernmentBackedDebtSecuritiesMember" xlink:to="CLSN_GovernmentBackedDebtSecuritiesMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_GovernmentBackedDebtSecuritiesMember_doc" xml:lang="en-US">Government Backed Debt Securities [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingWithinThreeMonthsAmortizedCost" xlink:to="CLSN_DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingWithinThreeMonthsAmortizedCost_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingWithinThreeMonthsAmortizedCost_doc" xml:lang="en-US">Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) with single maturity date and allocated without single maturity date, maturing in next rolling three months.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingBetweenThreeAndTwelveMonthsAmortizedCost" xlink:to="CLSN_DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingBetweenThreeAndTwelveMonthsAmortizedCost_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingBetweenThreeAndTwelveMonthsAmortizedCost_doc" xml:lang="en-US">Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in next rolling three to twelve months.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_AvailableForSaleDebtSecuritiesAmortizedCostBasisCurrent" xlink:to="CLSN_AvailableForSaleDebtSecuritiesAmortizedCostBasisCurrent_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_AvailableForSaleDebtSecuritiesAmortizedCostBasisCurrent_doc" xml:lang="en-US">The current amount of amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingWithinThreeMonthsFairValue" xlink:to="CLSN_DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingWithinThreeMonthsFairValue_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingWithinThreeMonthsFairValue_doc" xml:lang="en-US">Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in next rolling three months.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingBetweenThreeAndTwelveMonthsFairValue" xlink:to="CLSN_DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingBetweenThreeAndTwelveMonthsFairValue_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingBetweenThreeAndTwelveMonthsFairValue_doc" xml:lang="en-US">Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in next rolling three to twelve months.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_AvailableForSaleSecuritiesUnrealizedGainsFairValue" xlink:to="CLSN_AvailableForSaleSecuritiesUnrealizedGainsFairValue_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_AvailableForSaleSecuritiesUnrealizedGainsFairValue_doc" xml:lang="en-US">Available for sale securities unrealized gains fair value.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_AvailableForSaleSecuritiesUnrealizedHoldingGainsLessThanTwelveMonths" xlink:to="CLSN_AvailableForSaleSecuritiesUnrealizedHoldingGainsLessThanTwelveMonths_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_AvailableForSaleSecuritiesUnrealizedHoldingGainsLessThanTwelveMonths_doc" xml:lang="en-US">Available for sale securities unrealized gains less than twelve months.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_AvailableForSaleSecuritiesUnrealizedHoldingLossesLessThanTwelveMonths" xlink:to="CLSN_AvailableForSaleSecuritiesUnrealizedHoldingLossesLessThanTwelveMonths_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_AvailableForSaleSecuritiesUnrealizedHoldingLossesLessThanTwelveMonths_doc" xml:lang="en-US">Available for sale securities unrealized losses less than twelve months.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_AvailableForSaleSecuritiesUnrealizedLossFairValue" xlink:to="CLSN_AvailableForSaleSecuritiesUnrealizedLossFairValue_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_AvailableForSaleSecuritiesUnrealizedLossFairValue_doc" xml:lang="en-US">Available for sale securities unrealized losses fair value.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_AvailableForSaleSecuritiesUnrealizedHoldingGainsLossesLessThanTwelveMonths" xlink:to="CLSN_AvailableForSaleSecuritiesUnrealizedHoldingGainsLossesLessThanTwelveMonths_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_AvailableForSaleSecuritiesUnrealizedHoldingGainsLossesLessThanTwelveMonths_doc" xml:lang="en-US">Available for sale securities unrealized gains (losses) less than twelve months.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_InprocessRandDMember" xlink:to="CLSN_InprocessRandDMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_InprocessRandDMember_doc" xml:lang="en-US">Inprocess R&amp;D [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_IPRAndDMember" xlink:to="CLSN_IPRAndDMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_IPRAndDMember_doc" xml:lang="en-US">IPR&amp;D [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_EGENIncMember" xlink:to="CLSN_EGENIncMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_EGENIncMember_doc" xml:lang="en-US">Information pertaining to the business acquisition of EGEN, Inc.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_IPRAndDDrugTechnologyPlatformsMember" xlink:to="CLSN_IPRAndDDrugTechnologyPlatformsMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_IPRAndDDrugTechnologyPlatformsMember_doc" xml:lang="en-US">IPR&amp;D Drug Technology Platforms [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_OvarianCancerMember" xlink:to="CLSN_OvarianCancerMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_OvarianCancerMember_doc" xml:lang="en-US">Ovarian Cancer [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_GlioblastomaMultiformeBrainCancerMember" xlink:to="CLSN_GlioblastomaMultiformeBrainCancerMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_GlioblastomaMultiformeBrainCancerMember_doc" xml:lang="en-US">Glioblastoma Multiforme Brain Cancer [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_NoncashCharge" xlink:to="CLSN_NoncashCharge_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_NoncashCharge_doc" xml:lang="en-US">Non-cash charge.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_PurchaseAgreementMember" xlink:to="CLSN_PurchaseAgreementMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_PurchaseAgreementMember_doc" xml:lang="en-US">Purchase Agreement [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_AspirePurchaseAgreementsMember" xlink:to="CLSN_AspirePurchaseAgreementsMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_AspirePurchaseAgreementsMember_doc" xml:lang="en-US">2018 Aspire Purchase Agreements [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_LongTermDebtMaturitiesRepaymentsOfPrincipalYearFourAndThereAfter" xlink:to="CLSN_LongTermDebtMaturitiesRepaymentsOfPrincipalYearFourAndThereAfter_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_LongTermDebtMaturitiesRepaymentsOfPrincipalYearFourAndThereAfter_doc" xml:lang="en-US">Long Term Debt Maturities Repayments Of Principal Year Four And There After.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_FinalPaymentPercentage" xlink:to="CLSN_FinalPaymentPercentage_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_FinalPaymentPercentage_doc" xml:lang="en-US">Final Payment Percentage.</link:label>
      <link:loc xlink:type="locator" xlink:href="clsn-20210630.xsd#CLSN_UnrestrictedCashPercentage" xlink:label="CLSN_UnrestrictedCashPercentage" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_UnrestrictedCashPercentage" xlink:to="CLSN_UnrestrictedCashPercentage_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_UnrestrictedCashPercentage_doc" xml:lang="en-US">Unrestricted cash, percentage.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_EndOfTermChargePercentage" xlink:to="CLSN_EndOfTermChargePercentage_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_EndOfTermChargePercentage_doc" xml:lang="en-US">End of term charge percentage.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_InitialHorizonCreditAgreementMember" xlink:to="CLSN_InitialHorizonCreditAgreementMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_InitialHorizonCreditAgreementMember_doc" xml:lang="en-US">Initial Horizon Credit Agreement [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_ClassOfWarrantOrRightWarrantsOrRightsCancelled" xlink:to="CLSN_ClassOfWarrantOrRightWarrantsOrRightsCancelled_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_ClassOfWarrantOrRightWarrantsOrRightsCancelled_doc" xml:lang="en-US">Warrants cancelled.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_EndOfTermFees" xlink:to="CLSN_EndOfTermFees_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_EndOfTermFees_doc" xml:lang="en-US">End of term fees.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_InitialHorizonCreditAgreementAmendmentMember" xlink:to="CLSN_InitialHorizonCreditAgreementAmendmentMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_InitialHorizonCreditAgreementAmendmentMember_doc" xml:lang="en-US">Initial Horizon Credit Agreement Amendment [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_EarlyTerminationFees" xlink:to="CLSN_EarlyTerminationFees_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_EarlyTerminationFees_doc" xml:lang="en-US">Early termination fees.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_EarnoutMilestoneLiabilityDisclosureTextBlock" xlink:to="CLSN_EarnoutMilestoneLiabilityDisclosureTextBlock_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_EarnoutMilestoneLiabilityDisclosureTextBlock_doc" xml:lang="en-US">Earnout Milestone Liability Disclosure [Text Block]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_WarrantsTextBlock" xlink:to="CLSN_WarrantsTextBlock_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_WarrantsTextBlock_doc" xml:lang="en-US">Warrants [Text Block]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_LicensingTransactionTextBlock" xlink:to="CLSN_LicensingTransactionTextBlock_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_LicensingTransactionTextBlock_doc" xml:lang="en-US">Licensing Transaction [Text Block]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_SummaryOfStockOptionAndRestrictedStockAwardsTableTextBlock" xlink:to="CLSN_SummaryOfStockOptionAndRestrictedStockAwardsTableTextBlock_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_SummaryOfStockOptionAndRestrictedStockAwardsTableTextBlock_doc" xml:lang="en-US">Summary of Stock Option And Restricted Stock Awards [Table Text Block]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_ScheduleOfChangesInEarnOutMilestoneLiabilitiesTableTextBlock" xlink:to="CLSN_ScheduleOfChangesInEarnOutMilestoneLiabilitiesTableTextBlock_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_ScheduleOfChangesInEarnOutMilestoneLiabilitiesTableTextBlock_doc" xml:lang="en-US">The disclosure of transactions regarding the changes in earn-out liabilities during the period.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_ScheduleOfRiskadjustmentAssessmentTableTextBlock" xlink:to="CLSN_ScheduleOfRiskadjustmentAssessmentTableTextBlock_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_ScheduleOfRiskadjustmentAssessmentTableTextBlock_doc" xml:lang="en-US">Schedule Of Risk adjustment Assessment [Table Text Block]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_ShelfRegistrationStatementAmount" xlink:to="CLSN_ShelfRegistrationStatementAmount_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_ShelfRegistrationStatementAmount_doc" xml:lang="en-US">Shelf Registration statement.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_AggregateOfferingPrices" xlink:to="CLSN_AggregateOfferingPrices_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_AggregateOfferingPrices_doc" xml:lang="en-US">Aggregate offering price.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_CapitalOnDemandAgreementMember" xlink:to="CLSN_CapitalOnDemandAgreementMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_CapitalOnDemandAgreementMember_doc" xml:lang="en-US">Capital on Demand Agreement [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_SecuritiesPurchaseAgreementMember" xlink:to="CLSN_SecuritiesPurchaseAgreementMember_doc" xlink:type="arc" />
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      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_OriginalWarrantsMember" xlink:to="CLSN_OriginalWarrantsMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_OriginalWarrantsMember_doc" xml:lang="en-US">Original Warrants [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_ExchangeAgreementsMember" xlink:to="CLSN_ExchangeAgreementsMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_ExchangeAgreementsMember_doc" xml:lang="en-US">Exchange Agreements [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_UnderwritingAgreementMember" xlink:to="CLSN_UnderwritingAgreementMember_doc" xlink:type="arc" />
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      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_UnderwrittenOfferingMember" xlink:to="CLSN_UnderwrittenOfferingMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_UnderwrittenOfferingMember_doc" xml:lang="en-US">Underwritten Offering [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_UnderwritingDiscountPricePerShare" xlink:to="CLSN_UnderwritingDiscountPricePerShare_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_UnderwritingDiscountPricePerShare_doc" xml:lang="en-US">Underwriting discount price per share.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_PercentageOfUnderwritingDiscountOnPublicOfferingPrice" xlink:to="CLSN_PercentageOfUnderwritingDiscountOnPublicOfferingPrice_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_PercentageOfUnderwritingDiscountOnPublicOfferingPrice_doc" xml:lang="en-US">Percentage of underwriting discount on public offering price.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_JanuaryRegisteredDirectOfferingMember" xlink:to="CLSN_JanuaryRegisteredDirectOfferingMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_JanuaryRegisteredDirectOfferingMember_doc" xml:lang="en-US">January 2021 Registered Direct Offering [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_PlacementAgentFeeDescription" xlink:to="CLSN_PlacementAgentFeeDescription_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_PlacementAgentFeeDescription_doc" xml:lang="en-US">Placement agent fee description.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_MarchRegisteredDirectOfferingMember" xlink:to="CLSN_MarchRegisteredDirectOfferingMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_MarchRegisteredDirectOfferingMember_doc" xml:lang="en-US">March 2021 Registered Direct Offering [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_LPCPurchaseAgreementMember" xlink:to="CLSN_LPCPurchaseAgreementMember_doc" xlink:type="arc" />
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      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_LincolnParkCapitalFundLLCMember" xlink:to="CLSN_LincolnParkCapitalFundLLCMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_LincolnParkCapitalFundLLCMember_doc" xml:lang="en-US">Lincoln Park Capital Fund, LLC [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_LPCCommitmentSharesMember" xlink:to="CLSN_LPCCommitmentSharesMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_LPCCommitmentSharesMember_doc" xml:lang="en-US">LPC Commitment Shares [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_TwoThousandAndEighteenStockIncentivePlanMember" xlink:to="CLSN_TwoThousandAndEighteenStockIncentivePlanMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_TwoThousandAndEighteenStockIncentivePlanMember_doc" xml:lang="en-US">2018 Stock Incentive Plan [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_StockOptionsStrikePriceDescription" xlink:to="CLSN_StockOptionsStrikePriceDescription_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_StockOptionsStrikePriceDescription_doc" xml:lang="en-US">Stock options, strike price description.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_TwoThousandSevenStockIncentivePlanMember" xlink:to="CLSN_TwoThousandSevenStockIncentivePlanMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_TwoThousandSevenStockIncentivePlanMember_doc" xml:lang="en-US">2007 Stock Incentive Plan [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_InducementOptionGrantsMember" xlink:to="CLSN_InducementOptionGrantsMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_InducementOptionGrantsMember_doc" xml:lang="en-US">Inducement Option Grants [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_FiveNewEmployeesMember" xlink:to="CLSN_FiveNewEmployeesMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_FiveNewEmployeesMember_doc" xml:lang="en-US">Five New Employees [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_EquityStockAwardsMember" xlink:to="CLSN_EquityStockAwardsMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_EquityStockAwardsMember_doc" xml:lang="en-US">Equity Stock Awards [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_GrantedUnderTwoThousandEighteenPlanAndTwoThousandSevenPlanMember" xlink:to="CLSN_GrantedUnderTwoThousandEighteenPlanAndTwoThousandSevenPlanMember_doc" xlink:type="arc" />
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_TwoThousandAndEighteenPlanMember_doc" xml:lang="en-US">2018 Plan [Member]</link:label>
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      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_EarnoutMilestoneLiability" xlink:to="CLSN_EarnoutMilestoneLiability_doc" xlink:type="arc" />
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_RiskadjustmentAssessmentOfAchievingMilestone_doc" xml:lang="en-US">Risk-adjustment Assessment of achieving each Milestone.</link:label>
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_DiscountRatesOnMileStoneLiabilities_doc" xml:lang="en-US">Discount Rate on milestone liabilities.</link:label>
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_EstimatedTimeToAchieveMileStone_doc" xml:lang="en-US">Estimated time to achieve milestone liability.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_EarnoutMilestoneLiability1" xlink:to="CLSN_EarnoutMilestoneLiability1_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_EarnoutMilestoneLiability1_doc" xml:lang="en-US">Earnout milestone liability.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_AmendedAssetPurchaseAgreementMember" xlink:to="CLSN_AmendedAssetPurchaseAgreementMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_AmendedAssetPurchaseAgreementMember_doc" xml:lang="en-US">Amended Asset Purchase Agreement [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_AchievingMilestoneWithInOneYearMember" xlink:to="CLSN_AchievingMilestoneWithInOneYearMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_AchievingMilestoneWithInOneYearMember_doc" xml:lang="en-US">Within One Year of Achieving Milestone [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_CertainBusinessDaysOfAchievingMilestoneMember" xlink:to="CLSN_CertainBusinessDaysOfAchievingMilestoneMember_doc" xlink:type="arc" />
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      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_EGWCMember" xlink:to="CLSN_EGWCMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_EGWCMember_doc" xml:lang="en-US">EGWC, Inc [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_FairValueEarnoutMilestoneLiabilityMember" xlink:to="CLSN_FairValueEarnoutMilestoneLiabilityMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_FairValueEarnoutMilestoneLiabilityMember_doc" xml:lang="en-US">Fair Value Earnout Milestone Liability [Member]</link:label>
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      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_EarnoutPaymentOptionsDescription" xlink:to="CLSN_EarnoutPaymentOptionsDescription_doc" xlink:type="arc" />
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      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionsOutstandingIntrinsicValue" xlink:to="CLSN_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionsOutstandingIntrinsicValue_doc" xlink:type="arc" />
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      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_SharebasedCompensationArrangementBySharebasedPaymentAwardNonOptionsOutstandingWeightedAverageRemainingContractualTerm2" xlink:to="CLSN_SharebasedCompensationArrangementBySharebasedPaymentAwardNonOptionsOutstandingWeightedAverageRemainingContractualTerm2_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_SharebasedCompensationArrangementBySharebasedPaymentAwardNonOptionsOutstandingWeightedAverageRemainingContractualTerm2_doc" xml:lang="en-US">Weighted average remaining contractual term for non-option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.</link:label>
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingWeightedAverageExercisePrice_doc" xml:lang="en-US">Weighted average price at which grantees can acquire the shares reserved for issuance under the stock non-option equity plan.</link:label>
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExerciseInPeriodWeightedAverageExercisePrice_doc" xml:lang="en-US">Share based compensation arrangement by share based payment award non option equity instruments exercised in period weighted average exercise price.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearThreeAndThereAfter" xlink:to="CLSN_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearThreeAndThereAfter_doc" xlink:type="arc" />
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      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_FirstYearMember" xlink:to="CLSN_FirstYearMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_FirstYearMember_doc" xml:lang="en-US">First Year [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_FinalYearMember" xlink:to="CLSN_FinalYearMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_FinalYearMember_doc" xml:lang="en-US">Final Year [Member]</link:label>
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_SecondLeaseAmendmentMember_doc" xml:lang="en-US">2nd Lease Amendment [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_EGENAssetPurchaseAgreementMember" xlink:to="CLSN_EGENAssetPurchaseAgreementMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_EGENAssetPurchaseAgreementMember_doc" xml:lang="en-US">EGEN Asset Purchase Agreement [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_HuntsvilleAlabamaMember" xlink:to="CLSN_HuntsvilleAlabamaMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_HuntsvilleAlabamaMember_doc" xml:lang="en-US">Huntsville Alabama [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_OperatingLeasesMember" xlink:to="CLSN_OperatingLeasesMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_OperatingLeasesMember_doc" xml:lang="en-US">Operating Leases [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_HisunMember" xlink:to="CLSN_HisunMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_HisunMember_doc" xml:lang="en-US">Hisun [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_DeferredRevenueAmortizationPeriod" xlink:to="CLSN_DeferredRevenueAmortizationPeriod_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_DeferredRevenueAmortizationPeriod_doc" xml:lang="en-US">The amortization period for deferred revenue.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_UpfrontPaymentBeingRecognized" xlink:to="CLSN_UpfrontPaymentBeingRecognized_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_UpfrontPaymentBeingRecognized_doc" xml:lang="en-US">Upfront Payment, being recognized.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_ProceedsFromIssuanceOfCommonStockUponConversionOfStockWarrants" xlink:to="CLSN_ProceedsFromIssuanceOfCommonStockUponConversionOfStockWarrants_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="CLSN_ProceedsFromIssuanceOfCommonStockUponConversionOfStockWarrants_doc" xml:lang="en-US">Proceeds from issuance of common stock upon conversion of stock warrants.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_GlioblastomaMultiformeBrainCancerMember" xlink:to="CLSN_GlioblastomaMultiformeBrainCancerMember_3_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_GlioblastomaMultiformeBrainCancerMember_3_lbl" xml:lang="en-US">Glioblastoma Multiforme Brain Cancer [Member] [Default Label]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AssetsCurrent" xlink:to="us-gaap_AssetsCurrent_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AssetsCurrent_2_lbl" xml:lang="en-US">Assets, Current</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_Assets" xlink:to="us-gaap_Assets_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_Assets_2_lbl" xml:lang="en-US">Assets</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LiabilitiesCurrent" xlink:to="us-gaap_LiabilitiesCurrent_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LiabilitiesCurrent_2_lbl" xml:lang="en-US">Liabilities, Current</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_Liabilities" xlink:to="us-gaap_Liabilities_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_Liabilities_2_lbl" xml:lang="en-US">Liabilities</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockholdersEquityBeforeTreasuryStock" xlink:to="us-gaap_StockholdersEquityBeforeTreasuryStock_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockholdersEquityBeforeTreasuryStock_2_lbl" xml:lang="en-US">Stockholders' Equity before Treasury Stock</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_TreasuryStockValue" xlink:to="us-gaap_TreasuryStockValue_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_TreasuryStockValue_2_lbl" xml:lang="en-US">Treasury Stock, Value</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockholdersEquity" xlink:to="us-gaap_StockholdersEquity_4_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockholdersEquity_4_lbl" xml:lang="en-US">Stockholders' Equity Attributable to Parent</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LiabilitiesAndStockholdersEquity" xlink:to="us-gaap_LiabilitiesAndStockholdersEquity_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LiabilitiesAndStockholdersEquity_2_lbl" xml:lang="en-US">Liabilities and Equity</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OperatingExpenses" xlink:to="us-gaap_OperatingExpenses_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OperatingExpenses_2_lbl" xml:lang="en-US">Operating Expenses</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OperatingIncomeLoss" xlink:to="us-gaap_OperatingIncomeLoss_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OperatingIncomeLoss_2_lbl" xml:lang="en-US">Operating Income (Loss)</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NonoperatingIncomeExpense" xlink:to="us-gaap_NonoperatingIncomeExpense_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NonoperatingIncomeExpense_2_lbl" xml:lang="en-US">Nonoperating Income (Expense)</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted" xlink:to="us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted_2_lbl" xml:lang="en-US">Weighted Average Number of Shares Outstanding, Basic and Diluted</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax" xlink:to="us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax_2_lbl" xml:lang="en-US">OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment and Tax</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ComprehensiveIncomeNetOfTax" xlink:to="us-gaap_ComprehensiveIncomeNetOfTax_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ComprehensiveIncomeNetOfTax_2_lbl" xml:lang="en-US">Comprehensive Income (Loss), Net of Tax, Attributable to Parent</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ContractWithCustomerLiabilityRevenueRecognized" xlink:to="us-gaap_ContractWithCustomerLiabilityRevenueRecognized_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ContractWithCustomerLiabilityRevenueRecognized_2_lbl" xml:lang="en-US">Contract with Customer, Liability, Revenue Recognized</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DeferredIncomeTaxExpenseBenefit" xlink:to="us-gaap_DeferredIncomeTaxExpenseBenefit_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DeferredIncomeTaxExpenseBenefit_2_lbl" xml:lang="en-US">Deferred Income Tax Expense (Benefit)</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncreaseDecreaseInAccruedInvestmentIncomeReceivable" xlink:to="us-gaap_IncreaseDecreaseInAccruedInvestmentIncomeReceivable_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_IncreaseDecreaseInAccruedInvestmentIncomeReceivable_2_lbl" xml:lang="en-US">Increase (Decrease) in Accrued Investment Income Receivable</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets" xlink:to="us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_2_lbl" xml:lang="en-US">Increase (Decrease) in Prepaid Expense and Other Assets</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:to="us-gaap_NetCashProvidedByUsedInOperatingActivities_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivities_2_lbl" xml:lang="en-US">Net Cash Provided by (Used in) Operating Activities</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt" xlink:to="us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt_2_lbl" xml:lang="en-US">Payments to Acquire Debt Securities, Available-for-sale</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PaymentsToAcquirePropertyPlantAndEquipment" xlink:to="us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_2_lbl" xml:lang="en-US">Payments to Acquire Property, Plant, and Equipment</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetCashProvidedByUsedInInvestingActivities" xlink:to="us-gaap_NetCashProvidedByUsedInInvestingActivities_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NetCashProvidedByUsedInInvestingActivities_2_lbl" xml:lang="en-US">Net Cash Provided by (Used in) Investing Activities</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RepaymentsOfLongTermDebt" xlink:to="us-gaap_RepaymentsOfLongTermDebt_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_RepaymentsOfLongTermDebt_2_lbl" xml:lang="en-US">Repayments of Long-term Debt</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RepaymentsOfDebt" xlink:to="us-gaap_RepaymentsOfDebt_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_RepaymentsOfDebt_2_lbl" xml:lang="en-US">Repayments of Debt</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetCashProvidedByUsedInFinancingActivities" xlink:to="us-gaap_NetCashProvidedByUsedInFinancingActivities_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NetCashProvidedByUsedInFinancingActivities_2_lbl" xml:lang="en-US">Net Cash Provided by (Used in) Financing Activities</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect" xlink:to="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_2_lbl" xml:lang="en-US">Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations" xlink:to="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations_3_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations_3_lbl" xml:lang="en-US">Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InterestPaidNet" xlink:to="us-gaap_InterestPaidNet_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InterestPaidNet_2_lbl" xml:lang="en-US">Interest Paid, Excluding Capitalized Interest, Operating Activities</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SharesOutstanding" xlink:to="us-gaap_SharesOutstanding_3_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SharesOutstanding_3_lbl" xml:lang="en-US">Shares, Outstanding</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssuedDuringPeriodValueOther" xlink:to="us-gaap_StockIssuedDuringPeriodValueOther_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockIssuedDuringPeriodValueOther_2_lbl" xml:lang="en-US">Stock Issued During Period, Value, Other</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DerivativesAndFairValueTextBlock" xlink:to="us-gaap_DerivativesAndFairValueTextBlock_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DerivativesAndFairValueTextBlock_2_lbl" xml:lang="en-US">Derivatives and Fair Value [Text Block]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CLSN_WarrantsTextBlock" xlink:to="CLSN_WarrantsTextBlock_3_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CLSN_WarrantsTextBlock_3_lbl" xml:lang="en-US">Warrants [Text Block]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LesseeOperatingLeasesTextBlock" xlink:to="us-gaap_LesseeOperatingLeasesTextBlock_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LesseeOperatingLeasesTextBlock_2_lbl" xml:lang="en-US">Lessee, Operating Leases [Text Block]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" xlink:to="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_2_lbl" xml:lang="en-US">Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AmortizationOfIntangibleAssets" xlink:to="us-gaap_AmortizationOfIntangibleAssets_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AmortizationOfIntangibleAssets_2_lbl" xml:lang="en-US">Amortization of Intangible Assets</link:label>
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DebtInstrumentCarryingAmount_2_lbl" xml:lang="en-US">Long-term Debt, Gross</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LongTermDebt" xlink:to="us-gaap_LongTermDebt_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LongTermDebt_2_lbl" xml:lang="en-US">Long-term Debt</link:label>
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_3_lbl" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_3_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_3_lbl" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_3_lbl" xlink:type="arc" />
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<DOCUMENT>
<TYPE>EX-101.PRE
<SEQUENCE>9
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    <us-gaap:BusinessDescriptionAndAccountingPoliciesTextBlock contextRef="From2021-01-01to2021-06-30">&lt;p id="xdx_809_eus-gaap--BusinessDescriptionAndAccountingPoliciesTextBlock_zd0d78DlCrA4" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Note
1. &lt;span id="xdx_826_z77l7KZWFk3g"&gt;Business Description&lt;/span&gt;&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;Celsion
Corporation (&#x201c;Celsion&#x201d; and the &#x201c;Company&#x201d;) is a fully integrated, clinical stage biotechnology company focused
on advancing a portfolio of innovative treatments including DNA-based immunotherapies, next generation vaccines and directed chemotherapies
through clinical trials and eventual commercialization. The Company&#x2019;s product pipeline includes GEN-1, a DNA-based immunotherapy
for the localized treatment of ovarian cancer and ThermoDox&lt;sup&gt;&#xae;&lt;/sup&gt;, a proprietary heat-activated liposomal encapsulation of
doxorubicin, currently under investigator-sponsored development for several cancer indications. Celsion has two feasibility stage platform
technologies for the development of novel nucleic acid-based immunotherapies and next generation vaccines and other anti-cancer DNA or
RNA therapies. Both are novel synthetic, non-viral vectors with demonstrated capability in nucleic acid cellular transfection.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

</us-gaap:BusinessDescriptionAndAccountingPoliciesTextBlock>
    <us-gaap:BasisOfAccounting contextRef="From2021-01-01to2021-06-30">&lt;p id="xdx_808_eus-gaap--BasisOfAccounting_zZVqsNibJoJk" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Note
2. &lt;span id="xdx_828_ztNFNuNVrkjl"&gt;Basis of Presentation&lt;/span&gt;&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;The
accompanying unaudited condensed consolidated financial statements, which include the accounts of the Company and its wholly owned subsidiaries,
CLSN Laboratories, Inc. and Celsion, GmbH, have been prepared in accordance with generally accepted accounting principles
in the United States (GAAP) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X.
All significant intercompany balances and transactions have been eliminated in consolidation. Certain information and disclosures normally
included in financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;In
the opinion of management, all adjustments, consisting only of normal recurring accruals considered necessary for a fair presentation,
have been included in the accompanying unaudited condensed consolidated financial statements. Operating results for the three and six-month
periods June 30, 2021 and 2020 are not necessarily indicative of the results that may be expected for any other interim period(s)
or for any full year. For further information, refer to the financial statements and notes thereto included in the Company&#x2019;s Annual
Report on Form 10-K for the fiscal year ended December 31, 2020 filed with the Securities and Exchange Commission (SEC) on March 19,
2021.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;The
preparation of financial statements in conformity with GAAP requires management to make judgments, estimates, and assumptions that affect
the amount reported in the Company&#x2019;s financial statements and accompanying notes. Actual results could differ materially from those
estimates. Events and conditions arising subsequent to the most recent balance sheet date have been evaluated for their possible impact
on the financial statements and accompanying notes. The Company continues to monitor the impact of the COVID-19 pandemic on its financial
condition and results of operations, along with the valuation of its long-term assets, intangible assets, and goodwill. The effect of
this matter could potentially have an impact on the valuation of such assets in the future. The COVID-19 pandemic is discussed in more
detail in Note 3 to the financial statements.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

</us-gaap:BasisOfAccounting>
    <us-gaap:SubstantialDoubtAboutGoingConcernTextBlock contextRef="From2021-01-01to2021-06-30">&lt;p id="xdx_807_eus-gaap--SubstantialDoubtAboutGoingConcernTextBlock_zv4RrF6zTDT7" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Note
3. &lt;span id="xdx_821_zcInolR5nAVk"&gt;Financial Condition and Business Plan&lt;/span&gt;&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;Since
inception, the Company has incurred substantial operating losses, principally from expenses associated with the Company&#x2019;s research
and development programs, clinical trials conducted in connection with the Company&#x2019;s product candidates, and applications and submissions
to the U.S. Food and Drug Administration. The Company has not generated significant revenue and has incurred significant net losses in
each year since our inception. As of June 30, 2021, the Company has incurred approximately $&lt;span id="xdx_90D_eus-gaap--RetainedEarningsAccumulatedDeficit_iNI_pn6n6_di_c20210630_ztG3Q0nMBMe1"&gt;323
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;million of cumulative net losses and had approximately
$&lt;span id="xdx_90D_ecustom--CashAndCashEquivalentsRestrictedCashShorttermInvestmentsAndReceivableOnSaleOfNetOperatingLosses_iI_pn5n6_c20210630_zk4bgIWIquY2"&gt;64.5
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;million in cash and cash equivalents, restricted
cash, short-term investments and interest receivable. We have substantial future capital requirements to continue our research
and development activities and advance our product candidates through various development stages. The Company believes these expenditures
are essential for the commercialization of its technologies.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;The
Company expects its operating losses to continue for the foreseeable future as it continues its product development efforts, and when
it undertakes marketing and sales activities. The Company&#x2019;s ability to achieve profitability is dependent upon its ability to obtain
governmental approvals, manufacture, and market and sell its product candidates. There can be no assurance that the Company will be able
to commercialize its technology successfully or that profitability will ever be achieved. The operating results of the Company have fluctuated
significantly in the past.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;




&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;In
January 2020, the WHO declared an outbreak of coronavirus, COVID-19, to be a &#x201c;Public Health Emergency of International Concern,&#x201d;
and the U.S. Department of Health and Human Services declared a public health emergency to aid the U.S. healthcare community in responding
to COVID-19. This virus has spread to over 100 countries, including the U.S. Governments and businesses around the world have taken unprecedented
actions to mitigate the spread of COVID-19, including, but not limited to, shelter-in-place orders, quarantines, significant restrictions
on travel, as well as restrictions that prohibit many employees from going to work. Uncertainty with respect to the economic impacts
of the pandemic has introduced significant volatility in the financial markets. The Company did not observe significant impacts on its
business or results of operations during 2020 and into 2021 due to COVID-19. While the extent to which COVID-19 impacts the Company&#x2019;s
future results will depend on future developments, the pandemic and associated economic impacts could result in a material impact to
the Company&#x2019;s future financial condition, results of operations and cash flows. The Company&#x2019;s ability to raise additional
capital may be adversely impacted by potential worsening global economic conditions and the recent disruptions to, and volatility in,
financial markets in the U.S. and worldwide resulting from the ongoing COVID-19 pandemic. The disruptions caused by COVID-19 may also
disrupt the clinical trials process and enrolment of patients. This may delay commercialization efforts. The Company continues to monitor
its operating activities in light of these events. The specific impact, if any, is not readily determinable as of the date of these financial
statements.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;The
actual amount of funds the Company will need to operate is subject to many factors, some of which are beyond the Company&#x2019;s control.
These factors include the following:&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse"&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 0.5in; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#x25cf;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;the
    progress of research activities;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#x25cf;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;the
    number and scope of research programs;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#x25cf;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;the
    progress of preclinical and clinical development activities;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#x25cf;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;the
    progress of the development efforts of parties with whom the Company has entered into research and development agreements;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#x25cf;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;the
    costs associated with additional clinical trials of product candidates;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#x25cf;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;the
    ability to maintain current research and development licensing arrangements and to establish new research and development and licensing
    arrangements;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#x25cf;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;the
    ability to achieve milestones under licensing arrangements;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#x25cf;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;the
    costs involved in prosecuting and enforcing patent claims and other intellectual property rights; and&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#x25cf;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;the
    costs and timing of regulatory approvals.&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;
&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;On
July 13, 2020, the Company announced that it has received a recommendation from the independent DMC to consider stopping the global Phase
III OPTIMA Study of ThermoDox&lt;sup&gt;&#xae; &lt;/sup&gt;in combination with RFA for the treatment of HCC, or primary liver cancer. The recommendation
was made following the second pre-planned interim safety and efficacy analysis by the DMC on July 9, 2020. The DMC&#x2019;s analysis found
that the pre-specified boundary for stopping the trial for futility of 0.900 was crossed with an actual value of 0.903. The Company followed
the advice of the DMC and considered its options to either stop the study or continue to follow patients after a thorough review of the
data, and an evaluation of the probability of success. On February 11, 2021, the Company issued a letter to shareholders stating that
the Company was notifying all clinical sites to discontinue following patients in the OPTIMA Study.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;During
2020, 2019 and 2018, the Company submitted applications to sell a portion of the Company&#x2019;s State of New Jersey net operating losses
as part of the Technology Business Tax Certificate Program sponsored by The New Jersey Economic Development Authority. Under the program,
emerging biotechnology companies with unused NOLs and unused research and development credits are allowed to sell these benefits to other
New Jersey-based companies. In 2018 and 2019, the Company sold NOLs totaling $&lt;span id="xdx_904_ecustom--NetProceedsFromSaleOfNetOperatingLosses_pn6n6_c20180101__20181231__srt--StatementGeographicalAxis__custom--NJMember_zHT2zFu4X2nj"&gt;13
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;million receiving net proceeds of $&lt;span id="xdx_90B_ecustom--NetProceedsFromSaleOfNetOperatingLosses_pn5n6_c20190101__20191231__srt--StatementGeographicalAxis__custom--NJMember_z5oV6bjqj5ne"&gt;12.2
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;million. In June 2020 and as updated in September
2020, the Company filed an application with the New Jersey Economic Development Authority to sell substantially all of its remaining
State of New Jersey net operating losses totaling $&lt;span id="xdx_90C_ecustom--NetProceedsFromSaleOfNetOperatingLosses_pn5n6_c20200901__20200930__srt--StatementGeographicalAxis__custom--NJMember_zpaYoC4lW2z3"&gt;2.0
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;million available under the program. On February
12, 2021, the New Jersey Economic Development Authority approved the full amount of the Company&#x2019;s application. In February of 2021,
the Company entered into an agreement to sell the net operating losses from the 2020 application and the Company received net proceeds
of approximately $&lt;span id="xdx_90E_ecustom--ReceivableOnSaleOfNetOperatingLosses_iI_pn4n6_c20210630_zGqiWGHT1ncg"&gt;1.85&lt;/span&gt;&lt;/span&gt;
&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;million on May 10, 2021. During 2021, the New Jersey State
Legislature increased the maximum lifetime benefit per company from $&lt;span id="xdx_90C_ecustom--NetProceedsFromSaleOfNetOperatingLosses_pn6n6_c20210509__20210510__srt--StatementGeographicalAxis__custom--NJMember__srt--RangeAxis__srt--MinimumMember_zyDmUzUgjYo1"&gt;15
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;million to $&lt;span id="xdx_90E_ecustom--NetProceedsFromSaleOfNetOperatingLosses_pn6n6_c20210509__20210510__srt--StatementGeographicalAxis__custom--NJMember__srt--RangeAxis__srt--MaximumMember_zTnGwnQ5wTN7"&gt;20
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;million, which will allow the Company to participate
in this innovative funding program in future years. On June 16, 2021, the Company filed another application to sell approximately $&lt;span id="xdx_903_ecustom--NetProceedsFromSaleOfNetOperatingLosses_pn5n6_c20210615__20210616__srt--StatementGeographicalAxis__custom--NJMember_zOrlede95sDf"&gt;1.6
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;million of net operating losses during 2021
and expects to receive up to approximately $&lt;span id="xdx_908_ecustom--NetProceedsFromSaleOfNetOperatingLosses_pn5n6_c20210615__20210616__srt--StatementGeographicalAxis__custom--NJMember__srt--RangeAxis__srt--MaximumMember_zM14sOMsind"&gt;1.4
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;million under the current year program.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;




&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;In
June 2018, the Company entered into a Credit Agreement with Horizon Technology Finance Corporation (&#x201c;Horizon&#x201d;) that provided
$&lt;span id="xdx_902_eus-gaap--ProceedsFromContributedCapital_pn6n6_c20180601__20180630__us-gaap--TypeOfArrangementAxis__custom--HorizonCreditAgreementMember__dei--LegalEntityAxis__custom--HorizonTechnologyFinanceCorporationMember_zdLw2GbVEqGg"&gt;10
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;million in capital (the &#x201c;Horizon Credit
Agreement&#x201d;). The obligations under the Horizon Credit Agreement are secured by a first-priority security interest in substantially
all assets of Celsion other than intellectual property assets. Payments under the loan agreement are interest only (calculated based
on one-month LIBOR plus &lt;span id="xdx_90D_eus-gaap--DebtInstrumentInterestRateStatedPercentage_iI_pid_dp_uPercentage_c20180630__us-gaap--TypeOfArrangementAxis__custom--HorizonCreditAgreementMember__dei--LegalEntityAxis__custom--HorizonTechnologyFinanceCorporationMember__us-gaap--VariableRateAxis__us-gaap--LondonInterbankOfferedRateLIBORMember_zVwTUEla0Zqh"&gt;7.625&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;%)
for the first 24 months through July 2020, followed by a 21-month amortization period of principal and interest starting on August 1,
2020 and ending through the scheduled maturity date on April 1, 2023. On August 28, 2020, in connection with an Amendment to the Horizon
Credit Agreement, Celsion repaid $&lt;span id="xdx_90E_eus-gaap--RepaymentsOfNotesPayable_pn6n6_c20200827__20200828__us-gaap--TypeOfArrangementAxis__custom--AmendmentToHorizonCreditAgreementMember__dei--LegalEntityAxis__custom--HorizonTechnologyFinanceCorporationMember_zQaoltFZ080c"&gt;5
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;million of the $&lt;span id="xdx_907_eus-gaap--DebtInstrumentFaceAmount_iI_pn6n6_c20200828__us-gaap--TypeOfArrangementAxis__custom--HorizonCreditAgreementMember__dei--LegalEntityAxis__custom--HorizonTechnologyFinanceCorporationMember_zJqDwhPMg24e"&gt;10
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;million loan and $&lt;span id="xdx_902_ecustom--PaymentOfDebtEndTermCharges_pn5n6_c20200827__20200828__us-gaap--TypeOfArrangementAxis__custom--AmendmentToHorizonCreditAgreementMember__dei--LegalEntityAxis__custom--HorizonTechnologyFinanceCorporationMember_z5f0yRKT1L5k"&gt;0.2
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;million in related end of term charges, and the
remaining $&lt;span id="xdx_90E_eus-gaap--DebtInstrumentFaceAmount_iI_pn6n6_c20200828__us-gaap--TypeOfArrangementAxis__custom--AmendmentToHorizonCreditAgreementMember__dei--LegalEntityAxis__custom--HorizonTechnologyFinanceCorporationMember_z0bp8AxcWkHd"&gt;5
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;million in obligations were restructured. As
more fully discussed in Note 11 to these financial statements, in June 2021, the Company entered into a $&lt;span id="xdx_907_eus-gaap--LineOfCreditFacilityMaximumBorrowingCapacity_iI_pn6n6_c20210630__us-gaap--RelatedPartyTransactionsByRelatedPartyAxis__custom--SiliconValleyBankMember__us-gaap--TypeOfArrangementAxis__custom--SVBLoanFacilityMember_zV2Rv9i8JACe"&gt;10
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;million loan facility with Silicon Valley Bank.
The Company immediately used $&lt;span id="xdx_90D_ecustom--RepaymentOfOutstandingIndebtednessAmount_iI_pn6n6_c20210630__dei--LegalEntityAxis__custom--HorizonTechnologyFinanceCorporationMember__us-gaap--TypeOfArrangementAxis__custom--SVBLoanFacilityMember_zNLFG1E2xTB3"&gt;6
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;million from this facility to retire all outstanding
indebtedness with Horizon Technology Finance Corporation. The remaining $&lt;span id="xdx_90B_eus-gaap--LineOfCreditFacilityRemainingBorrowingCapacity_iI_pn6n6_c20210630__us-gaap--RelatedPartyTransactionsByRelatedPartyAxis__custom--SiliconValleyBankMember__us-gaap--TypeOfArrangementAxis__custom--SVBLoanFacilityMember_zxSF6sRCR6Dg"&gt;4
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;million will be available to be drawn down up
to 12 months after closing and will be used for working capital and to fund the advancement of the Company&#x2019;s product pipelines.
The funding is in the form of money market secured indebtedness bearing interest at a calculated WSJ Prime-based variable rate (currently
&lt;span id="xdx_907_eus-gaap--DebtInstrumentInterestRateStatedPercentage_iI_pid_dp_uPercentage_c20210630__us-gaap--RelatedPartyTransactionsByRelatedPartyAxis__custom--SiliconValleyBankMember__us-gaap--VariableRateAxis__us-gaap--PrimeRateMember__us-gaap--TypeOfArrangementAxis__custom--SVBLoanFacilityMember_zwZJPMZvFLd4"&gt;3.25&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;%).
&lt;span id="xdx_90C_eus-gaap--DebtInstrumentDescription_c20210101__20210630__us-gaap--TypeOfArrangementAxis__custom--SVBLoanFacilityMember_zf4PMOmqOnt5"&gt;Payments
under the loan agreement are interest only for the first 24 months after loan closing, followed by a 24-month amortization period of
principal and interest through the scheduled maturity date.&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;As
more fully discussed in Note 12, during 2021 through the date of the filing of this Quarterly Report on Form 10-Q, the Company has raised
approximately $&lt;span id="xdx_901_eus-gaap--ProceedsFromContributedCapital_pn5n6_c20210317__20210319__us-gaap--TypeOfArrangementAxis__custom--CapitalOnDemandTMSalesAgreementMember__dei--LegalEntityAxis__custom--JonesTradingInstitutionalServicesLLCMember_za4ISqmWMfL4"&gt;6.9
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;million in gross proceeds from the use of its
JonesTrading Capital on Demand&lt;sup&gt;TM&lt;/sup&gt; financing facility, $&lt;span id="xdx_903_eus-gaap--DebtInstrumentFaceAmount_iI_pn6n6_c20210131__us-gaap--TypeOfArrangementAxis__custom--CapitalOnDemandTMSalesAgreementMember__dei--LegalEntityAxis__custom--JonesTradingInstitutionalServicesLLCMember_zqPg8iwXU2p2"&gt;35
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;million from a registered direct financing completed
in January 2021, $&lt;span id="xdx_909_eus-gaap--DebtInstrumentFaceAmount_iI_pn6n6_c20210405__us-gaap--TypeOfArrangementAxis__custom--CapitalOnDemandTMSalesAgreementMember__dei--LegalEntityAxis__custom--JonesTradingInstitutionalServicesLLCMember_zQjCKudCqbe8"&gt;15
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;million from a registered direct financing completed
on April 5, 2021, and $&lt;span id="xdx_907_eus-gaap--ProceedsFromWarrantExercises_pn5n6_c20210101__20210131__us-gaap--TypeOfArrangementAxis__custom--CapitalOnDemandTMSalesAgreementMember__dei--LegalEntityAxis__custom--JonesTradingInstitutionalServicesLLCMember_zK45SMEHZAQk"&gt;1.5
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;million from warrant exercises. With $&lt;span id="xdx_906_ecustom--CashAndCashEquivalentsRestrictedCashShorttermInvestmentsAndReceivableOnSaleOfNetOperatingLosses_iI_pn5n6_c20210630__dei--LegalEntityAxis__custom--JonesTradingInstitutionalServicesLLCMember__us-gaap--TypeOfArrangementAxis__custom--CapitalOnDemandTMSalesAgreementMember_zAvkbZ7Ym9Yl"&gt;64.5
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;million in cash and cash equivalents, restricted
cash, short-term investments and interest receivable, the Company believes it has sufficient capital resources to fund
its operations through the end of 2024.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;The
Company has based its estimates on assumptions that may prove to be wrong. The Company may need to obtain additional funds sooner or
in greater amounts than it currently anticipates. Potential sources of financing include strategic relationships, public or private sales
of the Company&#x2019;s shares or debt, the sale of the Company&#x2019;s State of New Jersey net operating losses and other sources. If
the Company raises funds by selling additional shares of common stock or other securities convertible into common stock, the ownership
interest of existing stockholders may be diluted.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

</us-gaap:SubstantialDoubtAboutGoingConcernTextBlock>
    <us-gaap:RetainedEarningsAccumulatedDeficit contextRef="AsOf2021-06-30" decimals="-6" unitRef="USD">-323000000</us-gaap:RetainedEarningsAccumulatedDeficit>
    <CLSN:CashAndCashEquivalentsRestrictedCashShorttermInvestmentsAndReceivableOnSaleOfNetOperatingLosses contextRef="AsOf2021-06-30" decimals="-5" unitRef="USD">64500000</CLSN:CashAndCashEquivalentsRestrictedCashShorttermInvestmentsAndReceivableOnSaleOfNetOperatingLosses>
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      contextRef="From2018-01-012018-12-31_custom_NJMember"
      decimals="-6"
      unitRef="USD">13000000</CLSN:NetProceedsFromSaleOfNetOperatingLosses>
    <CLSN:NetProceedsFromSaleOfNetOperatingLosses
      contextRef="From2019-01-012019-12-31_custom_NJMember"
      decimals="-5"
      unitRef="USD">12200000</CLSN:NetProceedsFromSaleOfNetOperatingLosses>
    <CLSN:NetProceedsFromSaleOfNetOperatingLosses
      contextRef="From2020-09-012020-09-30_custom_NJMember"
      decimals="-5"
      unitRef="USD">2000000.0</CLSN:NetProceedsFromSaleOfNetOperatingLosses>
    <CLSN:ReceivableOnSaleOfNetOperatingLosses contextRef="AsOf2021-06-30" decimals="-4" unitRef="USD">1850000</CLSN:ReceivableOnSaleOfNetOperatingLosses>
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      contextRef="From2021-05-092021-05-10_custom_NJMember_srt_MinimumMember"
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      contextRef="From2021-05-092021-05-10_custom_NJMember_srt_MaximumMember"
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      contextRef="From2021-06-152021-06-16_custom_NJMember"
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      contextRef="From2021-06-152021-06-16_custom_NJMember_srt_MaximumMember"
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      unitRef="USD">1400000</CLSN:NetProceedsFromSaleOfNetOperatingLosses>
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      unitRef="USD">10000000</us-gaap:ProceedsFromContributedCapital>
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    <us-gaap:DebtInstrumentFaceAmount
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    <us-gaap:DebtInstrumentFaceAmount
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    <us-gaap:ProceedsFromWarrantExercises
      contextRef="From2021-01-012021-01-31_custom_CapitalOnDemandTMSalesAgreementMember_custom_JonesTradingInstitutionalServicesLLCMember"
      decimals="-5"
      unitRef="USD">1500000</us-gaap:ProceedsFromWarrantExercises>
    <CLSN:CashAndCashEquivalentsRestrictedCashShorttermInvestmentsAndReceivableOnSaleOfNetOperatingLosses
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      decimals="-5"
      unitRef="USD">64500000</CLSN:CashAndCashEquivalentsRestrictedCashShorttermInvestmentsAndReceivableOnSaleOfNetOperatingLosses>
    <us-gaap:NewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock contextRef="From2021-01-01to2021-06-30">&lt;p id="xdx_801_eus-gaap--NewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock_z9QsB29XOOTj" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Note
4. &lt;span id="xdx_82F_z5vVHZtyOqXc"&gt;New Accounting Pronouncements&lt;/span&gt;&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;From
time to time, new accounting pronouncements are issued by the Financial Accounting Standards Board (FASB) and are adopted by us as of
the specified effective date. Unless otherwise discussed, we believe that the impact of recently issued accounting pronouncements will
not have a material impact on the Company&#x2019;s condensed consolidated financial position, results of operations, and cash flows, or
do not apply to our operations.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;In
June 2016, the FASB issued ASU No. 2016-13, &#x201c;Financial Instruments &#x2013; Credit Losses (Topic 326): Measurement of Credit Losses
on Financial Instruments&#x201d;, which modifies the measurement of expected credit losses on certain financial instruments. The Company
adopted ASU 2016-13 in the first quarter of 2021 utilizing the modified retrospective transition method. Based on the composition of
the Company&#x2019;s investment portfolio and current market conditions, the adoption of ASU 2016-13 did not have a material impact on
its consolidated financial statements.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;In
December 2019, the FASB issued ASU No. 2019-12, Income Taxes (Topic 740). The standard simplifies the accounting for incomes taxes by
removing certain exceptions to the general principles in Topic 740 related to the approach for intra-period tax allocation and the recognition
of deferred tax liabilities for outside basis differences. The standard also clarifies the accounting for transactions that result in
a step-up in the tax basis of goodwill. The standard also improves consistent application of and simplifies GAAP for other areas of Topic
740 by clarifying and amending existing guidance. The amendment is effective for fiscal years, and interim periods within those fiscal
years, beginning after December 15, 2020. The Company adopted this standard during the first quarter of 2021. The adoption of ASU 2019-12
did not have a material impact on its consolidated financial statements.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;In
connection with the upcoming elimination of the London Inter-bank Offered Rate, (&#x201c;LIBOR&#x201d;) and other reference interest rates,
the FASB issued ASU 2020-04, Reference Rate Reform (Topic 848) Facilitation of the Effects of Reference Reform on Financial Reporting.
ASU 2020-04, which is available for contract modifications and hedging relationship modifications entered into or evaluated before December
31, 2022, provides certain practical expedients related to simplifying the accounting for contract modifications resulting from the change
in terms from LIBOR to a new required interest rate benchmark. The Company is currently evaluating the effects of adopting this accounting
standards update.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

</us-gaap:NewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock>
    <us-gaap:RestrictedAssetsDisclosureTextBlock contextRef="From2021-01-01to2021-06-30">&lt;p id="xdx_80F_eus-gaap--RestrictedAssetsDisclosureTextBlock_zSgNtnKozLjb" style="font: 10pt Times New Roman, Times, Serif; margin: 0"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Note
5. &lt;span id="xdx_82D_z5d9qsvgwDE2"&gt;Restricted Cash&lt;/span&gt;&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;&#160;&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;As
a condition of the $&lt;span id="xdx_901_eus-gaap--LineOfCreditFacilityMaximumBorrowingCapacity_iI_pn6n6_c20210618__us-gaap--RelatedPartyTransactionsByRelatedPartyAxis__custom--SiliconValleyBankMember__us-gaap--TypeOfArrangementAxis__custom--SVBLoanFacilityMember_zI0eQmDX1ONi"&gt;10
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;million loan facility with Silicon Valley Bank
(&#x201c;SVB&#x201d;) entered into on June 18, 2021 as further discussed in Note 11, &lt;span id="xdx_900_eus-gaap--LineOfCreditFacilityDescription_c20210601__20210618__us-gaap--TypeOfArrangementAxis__custom--SVBLoanFacilityMember_zVcmOyGoWY94"&gt;the
Company is required at all times to maintain on deposit with SVB as cash collateral in a segregated money market bank account
in the name of the Company, unrestricted and unencumbered cash in an amount of at least 100% of the aggregate outstanding amount of the
SVB loan facility. SVB may restrict withdrawals or transfers by or on behalf of the Company that would violate this requirement.
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;The required reserve totaled $&lt;span id="xdx_90A_eus-gaap--RestrictedInvestments_iI_pn5n6_c20210630__us-gaap--RelatedPartyTransactionsByRelatedPartyAxis__custom--SiliconValleyBankMember__us-gaap--TypeOfArrangementAxis__custom--SVBLoanFacilityMember_ziQKADbcEov2"&gt;6.0
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;million as of June 30, 2021. This amount is presented
in part as restricted cash in other non-current assets on the accompanying condensed consolidated balance sheets.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;




&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p id="xdx_898_eus-gaap--ScheduleOfRestrictedCashAndCashEquivalentsTextBlock_z8WfHHRzm9Ci" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;The
following table reconciles cash and cash equivalents and restricted cash per the balance sheet to the condensed statement of cash flows:&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; display: none; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;span id="xdx_8B9_zu6BBBVVxRYh"&gt;Schedule
of Cash and Cash Equivalents and Restricted Cash&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%"&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" id="xdx_499_20210630_zGNQaOpaYT13" style="font-weight: bold; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;June
    30,&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" id="xdx_493_20200630_zxHHC3hlb117" style="font-weight: bold; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;June
    30,&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;2021&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;2020&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_405_eus-gaap--CashAndCashEquivalentsAtCarryingValue_iI_pp0p0_maCCERCz29N_ztdehdP1Lfm9" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="width: 60%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Cash and cash equivalents&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 16%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;26,437,424&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 16%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;22,653,760&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_403_eus-gaap--RestrictedInvestments_iI_pp0p0_maCCERCz29N_zVPUqCGAxf5c" style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Money market investments,
    restricted&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1.5pt solid; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;6,000,000&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0773"&gt;&#160;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1.5pt solid; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;-&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_404_eus-gaap--CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_iTI_pp0p0_mtCCERCz29N_zHaEkfeLA1P2" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="padding-left: 10pt; padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Total&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;32,437,424&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;22,653,760&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;

&lt;p id="xdx_8AA_zpb3DK2tazK9" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

</us-gaap:RestrictedAssetsDisclosureTextBlock>
    <us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity
      contextRef="AsOf2021-06-18_custom_SiliconValleyBankMember_custom_SVBLoanFacilityMember"
      decimals="-6"
      unitRef="USD">10000000</us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity>
    <us-gaap:LineOfCreditFacilityDescription contextRef="From2021-06-012021-06-18_custom_SVBLoanFacilityMember">the
Company is required at all times to maintain on deposit with SVB as cash collateral in a segregated money market bank account
in the name of the Company, unrestricted and unencumbered cash in an amount of at least 100% of the aggregate outstanding amount of the
SVB loan facility. SVB may restrict withdrawals or transfers by or on behalf of the Company that would violate this requirement.</us-gaap:LineOfCreditFacilityDescription>
    <us-gaap:RestrictedInvestments
      contextRef="AsOf2021-06-30_custom_SiliconValleyBankMember_custom_SVBLoanFacilityMember"
      decimals="-5"
      unitRef="USD">6000000.0</us-gaap:RestrictedInvestments>
    <us-gaap:ScheduleOfRestrictedCashAndCashEquivalentsTextBlock contextRef="From2021-01-01to2021-06-30">&lt;p id="xdx_898_eus-gaap--ScheduleOfRestrictedCashAndCashEquivalentsTextBlock_z8WfHHRzm9Ci" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;The
following table reconciles cash and cash equivalents and restricted cash per the balance sheet to the condensed statement of cash flows:&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; display: none; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;span id="xdx_8B9_zu6BBBVVxRYh"&gt;Schedule
of Cash and Cash Equivalents and Restricted Cash&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%"&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" id="xdx_499_20210630_zGNQaOpaYT13" style="font-weight: bold; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;June
    30,&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" id="xdx_493_20200630_zxHHC3hlb117" style="font-weight: bold; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;June
    30,&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;2021&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;2020&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_405_eus-gaap--CashAndCashEquivalentsAtCarryingValue_iI_pp0p0_maCCERCz29N_ztdehdP1Lfm9" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="width: 60%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Cash and cash equivalents&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 16%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;26,437,424&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 16%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;22,653,760&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_403_eus-gaap--RestrictedInvestments_iI_pp0p0_maCCERCz29N_zVPUqCGAxf5c" style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Money market investments,
    restricted&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1.5pt solid; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;6,000,000&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0773"&gt;&#160;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1.5pt solid; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;-&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_404_eus-gaap--CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_iTI_pp0p0_mtCCERCz29N_zHaEkfeLA1P2" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="padding-left: 10pt; padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Total&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;32,437,424&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;22,653,760&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;

</us-gaap:ScheduleOfRestrictedCashAndCashEquivalentsTextBlock>
    <us-gaap:CashAndCashEquivalentsAtCarryingValue contextRef="AsOf2021-06-30" decimals="0" unitRef="USD">26437424</us-gaap:CashAndCashEquivalentsAtCarryingValue>
    <us-gaap:CashAndCashEquivalentsAtCarryingValue contextRef="AsOf2020-06-30" decimals="0" unitRef="USD">22653760</us-gaap:CashAndCashEquivalentsAtCarryingValue>
    <us-gaap:RestrictedInvestments contextRef="AsOf2021-06-30" decimals="0" unitRef="USD">6000000</us-gaap:RestrictedInvestments>
    <us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents contextRef="AsOf2021-06-30" decimals="0" unitRef="USD">32437424</us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents>
    <us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents contextRef="AsOf2020-06-30" decimals="0" unitRef="USD">22653760</us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents>
    <us-gaap:EarningsPerShareTextBlock contextRef="From2021-01-01to2021-06-30">&lt;p id="xdx_80A_eus-gaap--EarningsPerShareTextBlock_zwTEQ6ataZc8" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Note
6. &lt;span id="xdx_822_za03PqMUoPEf"&gt;Net Loss per Common Share&lt;/span&gt;&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;Basic
loss per share is calculated based upon the net loss available to common shareholders divided by the weighted average number of common
shares outstanding during the period. Diluted loss per share is calculated after adjusting the denominator of the basic earnings per
share computation for the effects of all dilutive potential common shares outstanding during the period. The dilutive effects of preferred
stock, options and warrants and their equivalents are computed using the treasury stock method.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;The
total number of shares of common stock issuable upon exercise of warrants, stock option grants and equity awards were &lt;span id="xdx_907_ecustom--NumberOfSharesOfCommonStockIssuableUponExerciseOfWarrantsAndEquityAwards_pid_c20210101__20210630_zmsnKy2rNZg4"&gt;9,325,228
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;and &lt;span id="xdx_901_ecustom--NumberOfSharesOfCommonStockIssuableUponExerciseOfWarrantsAndEquityAwards_pid_c20200101__20200630_z48gjb7JWcOk"&gt;8,560,124
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;shares for the three and six-month periods ended
June 30, 2021 and 2020, respectively. Warrants with an exercise price of $&lt;span id="xdx_907_eus-gaap--ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_c20210630_pdd"&gt;0.01
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;exercisable for &lt;span id="xdx_90F_ecustom--NumberOfSharesOfCommonStockIssuedInCalculationBasicLossPerShare_pid_c20200101__20200630_za86XsP5oyP7"&gt;200,000
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;shares of common stock were considered issued
in calculating basic loss per share during the first six-months of 2020. These warrants were exercised in October 2020. For the three
and six-month periods ended June 30, 2021 and 2020, diluted loss per common share was the same as basic loss per common share as the
other warrants and equity awards that were convertible into shares of the Company&#x2019;s common stock were excluded from the calculation
of diluted loss per common share as their effect would have been anti-dilutive. The Company did not pay any dividends during the first
six months of 2021 or 2020.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

</us-gaap:EarningsPerShareTextBlock>
    <CLSN:NumberOfSharesOfCommonStockIssuableUponExerciseOfWarrantsAndEquityAwards
      contextRef="From2021-01-01to2021-06-30"
      decimals="INF"
      unitRef="Shares">9325228</CLSN:NumberOfSharesOfCommonStockIssuableUponExerciseOfWarrantsAndEquityAwards>
    <CLSN:NumberOfSharesOfCommonStockIssuableUponExerciseOfWarrantsAndEquityAwards
      contextRef="From2020-01-012020-06-30"
      decimals="INF"
      unitRef="Shares">8560124</CLSN:NumberOfSharesOfCommonStockIssuableUponExerciseOfWarrantsAndEquityAwards>
    <us-gaap:ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
      contextRef="AsOf2021-06-30"
      decimals="INF"
      unitRef="USDPShares">0.01</us-gaap:ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1>
    <CLSN:NumberOfSharesOfCommonStockIssuedInCalculationBasicLossPerShare
      contextRef="From2020-01-012020-06-30"
      decimals="INF"
      unitRef="Shares">200000</CLSN:NumberOfSharesOfCommonStockIssuedInCalculationBasicLossPerShare>
    <us-gaap:InvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureTextBlock contextRef="From2021-01-01to2021-06-30">&lt;p id="xdx_80A_eus-gaap--InvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureTextBlock_zlpYMOEScUfh" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Note
7. &lt;span id="xdx_828_zpgEeELWxkTd"&gt;Investment in Debt Securities Available for Sale&lt;/span&gt;&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;Investments
in debt securities available for sale with a fair value of $&lt;span id="xdx_901_eus-gaap--AvailableForSaleSecuritiesDebtSecuritiesCurrent_c20210630_pp0p0"&gt;31,923,285
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;as of June 30, 2021, consisted of government
backed debt securities and commercial paper. These investments are valued at estimated fair value, with unrealized gains and losses reported
as a separate component of stockholders&#x2019; equity in accumulated other comprehensive loss. The Company only had investments in cash
and cash equivalents on December 31, 2020.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;Investments
in debt securities available for sale are evaluated periodically to determine whether a decline in their value is other than temporary.
The term &#x201c;other than temporary&#x201d; is not intended to indicate a permanent decline in value. Rather, it means that the prospects
for near term recovery of value are not necessarily favorable, or that there is a lack of evidence to support fair values equal to, or
greater than, the carrying value of the security. Management reviews criteria such as the magnitude and duration of the decline, as well
as the reasons for the decline, to predict whether the loss in value is other than temporary. Once a decline in value is determined to
be other than temporary, the value of the security is reduced and a corresponding charge to earnings is recognized.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p id="xdx_89A_eus-gaap--AvailableForSaleSecuritiesTextBlock_zRaide2ifxYk" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;A
summary of the cost, fair value and maturities of the Company&#x2019;s short-term investments is as follows:&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; display: none; margin: 0"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;span id="xdx_8BC_z87fG4UsVTe9"&gt;Schedule
of Cost, Fair Value and Maturities of Short Term Investments&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%"&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td style="font-weight: bold; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="6" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;June
    30, 2021&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="6" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;December
    31, 2020&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td style="font-weight: bold; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Cost&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Fair
    Value&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Cost&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Fair
    Value&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font-weight: bold; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Short-term investments&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="width: 40%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Commercial paper&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98A_eus-gaap--ShortTermInvestments_c20210630__us-gaap--FinancialInstrumentAxis__us-gaap--CommercialPaperMember_pp0p0" style="width: 11%; text-align: right" title="Short-term investments - Cost"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;7,795,035&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98E_eus-gaap--AvailableForSaleSecuritiesDebtSecuritiesCurrent_c20210630__us-gaap--FinancialInstrumentAxis__us-gaap--CommercialPaperMember_pp0p0" style="width: 11%; text-align: right" title="Short-term investments - Fair Value"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;7,792,785&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_980_eus-gaap--ShortTermInvestments_c20201231__us-gaap--FinancialInstrumentAxis__us-gaap--CommercialPaperMember_pp0p0" style="width: 11%; text-align: right" title="Short-term investments - Cost"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0793"&gt;-&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98D_eus-gaap--AvailableForSaleSecuritiesDebtSecuritiesCurrent_c20201231__us-gaap--FinancialInstrumentAxis__us-gaap--CommercialPaperMember_pp0p0" style="width: 11%; text-align: right" title="Short-term investments - Fair Value"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0795"&gt;-&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="text-align: left; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Government backed debt
    securities&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_985_eus-gaap--ShortTermInvestments_c20210630__us-gaap--FinancialInstrumentAxis__custom--GovernmentBackedDebtSecuritiesMember_pp0p0" style="border-bottom: Black 1.5pt solid; text-align: right" title="Short-term investments - Cost"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;24,132,020&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98A_eus-gaap--AvailableForSaleSecuritiesDebtSecuritiesCurrent_c20210630__us-gaap--FinancialInstrumentAxis__custom--GovernmentBackedDebtSecuritiesMember_pp0p0" style="border-bottom: Black 1.5pt solid; text-align: right" title="Short-term investments - Fair Value"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;24,130,500&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1.5pt solid; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;-&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1.5pt solid; text-align: right"&gt;-&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font-weight: bold; padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Total&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_986_eus-gaap--ShortTermInvestments_c20210630_pp0p0" style="border-bottom: Black 2.5pt double; text-align: right" title="Short-term investments - Cost"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;31,927,055&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_989_eus-gaap--AvailableForSaleSecuritiesDebtSecuritiesCurrent_c20210630_pp0p0" style="border-bottom: Black 2.5pt double; text-align: right" title="Short-term investments - Fair Value"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;31,923,285&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_981_eus-gaap--ShortTermInvestments_c20201231_pp0p0" style="border-bottom: Black 2.5pt double; text-align: right" title="Short-term investments - Cost"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0805"&gt;-&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98C_eus-gaap--AvailableForSaleSecuritiesDebtSecuritiesCurrent_c20201231_pp0p0" style="border-bottom: Black 2.5pt double; text-align: right" title="Short-term investments - Fair Value"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0807"&gt;-&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%"&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="6" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;June
    30, 2021&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="6" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;December
    31, 2020&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td style="font-weight: bold; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Cost&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Fair
    Value&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Cost&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Fair
    Value&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font-weight: bold; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Short-term investment maturities&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font-weight: bold; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font-weight: bold; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font-weight: bold; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font-weight: bold; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="width: 40%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Within 3 months&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_985_ecustom--DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingWithinThreeMonthsAmortizedCost_c20210630_pp0p0" style="width: 11%; text-align: right" title="Short-term investment maturities - Within 3 months, cost"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;2,999,420&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_989_ecustom--DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingWithinThreeMonthsFairValue_c20210630_pp0p0" style="width: 11%; text-align: right" title="Short-term investment maturities - Within 3 months, fair value"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;7,792,785&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_986_ecustom--DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingWithinThreeMonthsAmortizedCost_c20201231_pp0p0" style="width: 11%; text-align: right" title="Short-term investment maturities - Within 3 months, cost"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0813"&gt;-&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_984_ecustom--DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingWithinThreeMonthsFairValue_c20201231_pp0p0" style="width: 11%; text-align: right" title="Short-term investment maturities - Within 3 months, fair value"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0815"&gt;-&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Between 3-12 months&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_981_ecustom--DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingBetweenThreeAndTwelveMonthsAmortizedCost_c20210630_pp0p0" style="border-bottom: Black 1.5pt solid; text-align: right" title="Short-term investment maturities - Between 3-12 months, cost"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;28,927,635&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98E_ecustom--DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingBetweenThreeAndTwelveMonthsFairValue_c20210630_pp0p0" style="border-bottom: Black 1.5pt solid; text-align: right" title="Short-term investment maturities - Between 3-12 months, fair value"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;24,130,500&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_984_ecustom--DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingBetweenThreeAndTwelveMonthsAmortizedCost_c20201231_pp0p0" style="border-bottom: Black 1.5pt solid; text-align: right" title="Short-term investment maturities - Between 3-12 months, cost"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0821"&gt;-&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98D_ecustom--DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingBetweenThreeAndTwelveMonthsFairValue_c20201231_pp0p0" style="border-bottom: Black 1.5pt solid; text-align: right" title="Short-term investment maturities - Between 3-12 months, fair value"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0823"&gt;-&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font-weight: bold; padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Total&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98B_ecustom--AvailableForSaleDebtSecuritiesAmortizedCostBasisCurrent_c20210630_pp0p0" style="border-bottom: Black 2.5pt double; text-align: right" title="Total, cost"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;31,927,055&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_983_eus-gaap--AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate_c20210630_pp0p0" style="border-bottom: Black 2.5pt double; text-align: right" title="Total, fair value"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;31,923,285&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_988_ecustom--AvailableForSaleDebtSecuritiesAmortizedCostBasisCurrent_c20201231_pp0p0" style="border-bottom: Black 2.5pt double; text-align: right" title="Total, cost"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0829"&gt;-&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_980_eus-gaap--AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate_c20201231_pp0p0" style="border-bottom: Black 2.5pt double; text-align: right" title="Total, fair value"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0831"&gt;-&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;

&lt;p id="xdx_8AE_zM8e9HIJINVg" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;




&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p id="xdx_899_eus-gaap--ScheduleOfUnrealizedLossOnInvestmentsTableTextBlock_zoRkyQc8eJSh" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;The
following table shows the Company&#x2019;s investment in debt securities available for sale gross unrealized gains (losses) and fair value
by investment category and length of time that individual securities have been in a continuous unrealized loss position at June 30, 2021
and December 31, 2020. The Company has reviewed individual securities to determine whether a decline in fair value below the amortizable
cost basis is other than temporary.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; display: none; margin: 0; text-align: justify"&gt;&lt;span id="xdx_8BD_zpnMxAxahwPg" style="font: 10pt Times New Roman, Times, Serif"&gt;Summary
of Investment Securities Gross Unrealized Gains (Losses)&lt;/span&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%"&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td style="font-weight: bold; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="6" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;June
    30, 2021&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="6" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;December
    31, 2020&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Available
    for sale securities (all unrealized holding gains and losses are less than 12 months at date of measurement)&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Fair
    Value&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"&gt;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Unrealized
                                            Holding&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Gains
                                            (Losses)&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Fair
    Value&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"&gt;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Unrealized
                                            Holding&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Gains
                                            (Losses)&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="width: 44%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Investments with unrealized gains&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_987_ecustom--AvailableForSaleSecuritiesUnrealizedGainsFairValue_iI_c20210630_z3kP7aYVfYY7" style="width: 11%; text-align: right" title="Investments with unrealized gains, Fair Value"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;5,998,980&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_989_ecustom--AvailableForSaleSecuritiesUnrealizedHoldingGainsLessThanTwelveMonths_iI_c20210630_z73yY5dYjkJj" style="width: 11%; text-align: right" title="Investments with unrealized gains, Unrealized Holding Gains (Losses)"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;1,073&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98E_ecustom--AvailableForSaleSecuritiesUnrealizedGainsFairValue_iI_c20201231_zEUHF5fxggM9" style="width: 9%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0838"&gt;-&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98D_ecustom--AvailableForSaleSecuritiesUnrealizedHoldingGainsLessThanTwelveMonths_iI_c20201231_zJALWk90Uhec" style="width: 9%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0839"&gt;-&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Investments with unrealized
    losses&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98C_ecustom--AvailableForSaleSecuritiesUnrealizedLossFairValue_iI_c20210630_z9UDyW8OCJEh" style="border-bottom: Black 1.5pt solid; text-align: right" title="Investments with unrealized losses, Fair Value"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;25,924,305&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_989_ecustom--AvailableForSaleSecuritiesUnrealizedHoldingLossesLessThanTwelveMonths_iI_c20210630_zlbRJMBli5Vc" style="border-bottom: Black 1.5pt solid; text-align: right" title="Investments with unrealized Losses, Unrealized Holding Gains (Losses)"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;(4,843&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;)&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_980_ecustom--AvailableForSaleSecuritiesUnrealizedLossFairValue_iI_c20201231_zEaBVYTqEBR" style="border-bottom: Black 1.5pt solid; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0844"&gt;-&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98B_ecustom--AvailableForSaleSecuritiesUnrealizedHoldingLossesLessThanTwelveMonths_iI_c20201231_zC9q5gqMTzC2" style="border-bottom: Black 1.5pt solid; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0845"&gt;-&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="padding-left: 10pt; font-weight: bold; padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Total&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_989_eus-gaap--AvailableForSaleSecuritiesDebtSecuritiesCurrent_iI_c20210630_zd1pGBsy9UX3" style="border-bottom: Black 2.5pt double; text-align: right" title="Investment securities, available for sale"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;31,923,285&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_988_ecustom--AvailableForSaleSecuritiesUnrealizedHoldingGainsLossesLessThanTwelveMonths_iI_c20210630_zklx76pw00Xl" style="border-bottom: Black 2.5pt double; text-align: right" title="Investments with unrealized Gains (Losses), Unrealized Holding Gains (Losses)"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;(3,770&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;)&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98E_eus-gaap--AvailableForSaleSecuritiesDebtSecuritiesCurrent_iI_pp0p0_c20201231_zitrNAaI3459" style="border-bottom: Black 2.5pt double; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0850"&gt;-&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98A_ecustom--AvailableForSaleSecuritiesUnrealizedHoldingGainsLossesLessThanTwelveMonths_iI_c20201231_zMBfZ8IjgWek" style="border-bottom: Black 2.5pt double; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0851"&gt;-&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;

&lt;p id="xdx_8A4_zQnLlUZMRva7" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p id="xdx_89F_eus-gaap--InvestmentIncomeTextBlock_zFQTOKwfKVCf" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;Investment
(loss) income, which includes net realized losses on sales of available for sale securities and investment income interest and
dividends, is summarized as follows:&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; display: none; margin: 0"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;span id="xdx_8B2_zeRwJVgb5CRk"&gt;Summary
of Net Realized Losses on Sales of Available for Sale Securities and Investment Income Interest and Dividends&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%"&gt;
  &lt;tr style="display: none; vertical-align: bottom"&gt;
    &lt;td style="text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" id="xdx_494_20210401__20210630_zSHyDhyzLjZ6" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;2021&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" id="xdx_493_20200401__20200630_zgTSeZK7Cr9e" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;2020&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom"&gt;
    &lt;td style="text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="6" style="border-bottom: Black 1.5pt solid; text-align: center"&gt;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Three
                                            Months Ended&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;June
                                            30,&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td style="text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;2021&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;2020&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_403_eus-gaap--InvestmentIncomeInterestAndDividend_maIINzj8E_zfdE28HysZqg" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="width: 60%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Interest and dividends accrued
    and paid&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 16%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;1,436&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 16%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;18,095&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_409_eus-gaap--AvailableForSaleSecuritiesGrossRealizedGainLossNet_maIINzj8E_zSqSuTUlXRhc" style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Realized (losses) gains&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1.5pt solid; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;(1,785&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;)&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1.5pt solid; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;2,865&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_403_ecustom--InvestmentIncomeLossNonoperating_iT_pp0p0_mtIINzj8E_zhAI9SQfD4u6" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="text-align: left; padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Investment (loss) income,
    net&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;(349&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;)&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;20,960&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%"&gt;
  &lt;tr style="display: none; vertical-align: bottom"&gt;
    &lt;td style="text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" id="xdx_495_20210101__20210630_zueeupzM32bg" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;2021&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" id="xdx_494_20200101__20200630_zlvHlUejVj51" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;2020&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom"&gt;
    &lt;td style="text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="6" style="border-bottom: Black 1.5pt solid; text-align: center"&gt;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Six
                                            Months Ended&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;June
                                            30,&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td style="text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;2021&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;2020&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_400_eus-gaap--InvestmentIncomeInterestAndDividend_maIINz3xg_z2bCtAatVzL4" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="width: 60%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Interest and dividends accrued
    and paid&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 16%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;3,847&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 16%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;63,172&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40C_eus-gaap--AvailableForSaleSecuritiesGrossRealizedGainLossNet_maIINz3xg_zLf2CPwQ83kc" style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Realized (losses) gains&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1.5pt solid; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;(1,785&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;)&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1.5pt solid; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;46,097&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_402_ecustom--InvestmentIncomeLossNonoperating_iT_mtIINz3xg_zXBNfvUuLAe7" style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left; padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Investment income, net&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;2,062&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;109,269&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40F_ecustom--InvestmentIncomeLossNonoperating_iT_mtIINz3xg_zEY8MspCTele" style="display: none; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left; padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Investment (loss) income,
    net&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;2,062&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;109,269&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;

</us-gaap:InvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureTextBlock>
    <us-gaap:AvailableForSaleSecuritiesDebtSecuritiesCurrent contextRef="AsOf2021-06-30" decimals="0" unitRef="USD">31923285</us-gaap:AvailableForSaleSecuritiesDebtSecuritiesCurrent>
    <us-gaap:AvailableForSaleSecuritiesTextBlock contextRef="From2021-01-01to2021-06-30">&lt;p id="xdx_89A_eus-gaap--AvailableForSaleSecuritiesTextBlock_zRaide2ifxYk" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;A
summary of the cost, fair value and maturities of the Company&#x2019;s short-term investments is as follows:&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; display: none; margin: 0"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;span id="xdx_8BC_z87fG4UsVTe9"&gt;Schedule
of Cost, Fair Value and Maturities of Short Term Investments&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%"&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td style="font-weight: bold; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="6" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;June
    30, 2021&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="6" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;December
    31, 2020&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td style="font-weight: bold; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Cost&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Fair
    Value&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Cost&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Fair
    Value&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font-weight: bold; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Short-term investments&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="width: 40%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Commercial paper&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98A_eus-gaap--ShortTermInvestments_c20210630__us-gaap--FinancialInstrumentAxis__us-gaap--CommercialPaperMember_pp0p0" style="width: 11%; text-align: right" title="Short-term investments - Cost"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;7,795,035&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98E_eus-gaap--AvailableForSaleSecuritiesDebtSecuritiesCurrent_c20210630__us-gaap--FinancialInstrumentAxis__us-gaap--CommercialPaperMember_pp0p0" style="width: 11%; text-align: right" title="Short-term investments - Fair Value"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;7,792,785&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_980_eus-gaap--ShortTermInvestments_c20201231__us-gaap--FinancialInstrumentAxis__us-gaap--CommercialPaperMember_pp0p0" style="width: 11%; text-align: right" title="Short-term investments - Cost"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0793"&gt;-&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98D_eus-gaap--AvailableForSaleSecuritiesDebtSecuritiesCurrent_c20201231__us-gaap--FinancialInstrumentAxis__us-gaap--CommercialPaperMember_pp0p0" style="width: 11%; text-align: right" title="Short-term investments - Fair Value"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0795"&gt;-&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="text-align: left; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Government backed debt
    securities&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_985_eus-gaap--ShortTermInvestments_c20210630__us-gaap--FinancialInstrumentAxis__custom--GovernmentBackedDebtSecuritiesMember_pp0p0" style="border-bottom: Black 1.5pt solid; text-align: right" title="Short-term investments - Cost"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;24,132,020&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98A_eus-gaap--AvailableForSaleSecuritiesDebtSecuritiesCurrent_c20210630__us-gaap--FinancialInstrumentAxis__custom--GovernmentBackedDebtSecuritiesMember_pp0p0" style="border-bottom: Black 1.5pt solid; text-align: right" title="Short-term investments - Fair Value"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;24,130,500&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1.5pt solid; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;-&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1.5pt solid; text-align: right"&gt;-&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font-weight: bold; padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Total&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_986_eus-gaap--ShortTermInvestments_c20210630_pp0p0" style="border-bottom: Black 2.5pt double; text-align: right" title="Short-term investments - Cost"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;31,927,055&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_989_eus-gaap--AvailableForSaleSecuritiesDebtSecuritiesCurrent_c20210630_pp0p0" style="border-bottom: Black 2.5pt double; text-align: right" title="Short-term investments - Fair Value"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;31,923,285&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_981_eus-gaap--ShortTermInvestments_c20201231_pp0p0" style="border-bottom: Black 2.5pt double; text-align: right" title="Short-term investments - Cost"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0805"&gt;-&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98C_eus-gaap--AvailableForSaleSecuritiesDebtSecuritiesCurrent_c20201231_pp0p0" style="border-bottom: Black 2.5pt double; text-align: right" title="Short-term investments - Fair Value"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0807"&gt;-&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%"&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="6" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;June
    30, 2021&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="6" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;December
    31, 2020&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td style="font-weight: bold; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Cost&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Fair
    Value&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Cost&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Fair
    Value&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font-weight: bold; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Short-term investment maturities&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font-weight: bold; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font-weight: bold; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font-weight: bold; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font-weight: bold; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="width: 40%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Within 3 months&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_985_ecustom--DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingWithinThreeMonthsAmortizedCost_c20210630_pp0p0" style="width: 11%; text-align: right" title="Short-term investment maturities - Within 3 months, cost"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;2,999,420&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_989_ecustom--DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingWithinThreeMonthsFairValue_c20210630_pp0p0" style="width: 11%; text-align: right" title="Short-term investment maturities - Within 3 months, fair value"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;7,792,785&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_986_ecustom--DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingWithinThreeMonthsAmortizedCost_c20201231_pp0p0" style="width: 11%; text-align: right" title="Short-term investment maturities - Within 3 months, cost"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0813"&gt;-&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_984_ecustom--DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingWithinThreeMonthsFairValue_c20201231_pp0p0" style="width: 11%; text-align: right" title="Short-term investment maturities - Within 3 months, fair value"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0815"&gt;-&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Between 3-12 months&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_981_ecustom--DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingBetweenThreeAndTwelveMonthsAmortizedCost_c20210630_pp0p0" style="border-bottom: Black 1.5pt solid; text-align: right" title="Short-term investment maturities - Between 3-12 months, cost"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;28,927,635&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98E_ecustom--DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingBetweenThreeAndTwelveMonthsFairValue_c20210630_pp0p0" style="border-bottom: Black 1.5pt solid; text-align: right" title="Short-term investment maturities - Between 3-12 months, fair value"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;24,130,500&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_984_ecustom--DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingBetweenThreeAndTwelveMonthsAmortizedCost_c20201231_pp0p0" style="border-bottom: Black 1.5pt solid; text-align: right" title="Short-term investment maturities - Between 3-12 months, cost"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0821"&gt;-&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98D_ecustom--DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingBetweenThreeAndTwelveMonthsFairValue_c20201231_pp0p0" style="border-bottom: Black 1.5pt solid; text-align: right" title="Short-term investment maturities - Between 3-12 months, fair value"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0823"&gt;-&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font-weight: bold; padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Total&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98B_ecustom--AvailableForSaleDebtSecuritiesAmortizedCostBasisCurrent_c20210630_pp0p0" style="border-bottom: Black 2.5pt double; text-align: right" title="Total, cost"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;31,927,055&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_983_eus-gaap--AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate_c20210630_pp0p0" style="border-bottom: Black 2.5pt double; text-align: right" title="Total, fair value"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;31,923,285&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_988_ecustom--AvailableForSaleDebtSecuritiesAmortizedCostBasisCurrent_c20201231_pp0p0" style="border-bottom: Black 2.5pt double; text-align: right" title="Total, cost"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0829"&gt;-&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_980_eus-gaap--AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate_c20201231_pp0p0" style="border-bottom: Black 2.5pt double; text-align: right" title="Total, fair value"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0831"&gt;-&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;

</us-gaap:AvailableForSaleSecuritiesTextBlock>
    <us-gaap:ShortTermInvestments
      contextRef="AsOf2021-06-30_us-gaap_CommercialPaperMember"
      decimals="0"
      unitRef="USD">7795035</us-gaap:ShortTermInvestments>
    <us-gaap:AvailableForSaleSecuritiesDebtSecuritiesCurrent
      contextRef="AsOf2021-06-30_us-gaap_CommercialPaperMember"
      decimals="0"
      unitRef="USD">7792785</us-gaap:AvailableForSaleSecuritiesDebtSecuritiesCurrent>
    <us-gaap:ShortTermInvestments
      contextRef="AsOf2021-06-30_custom_GovernmentBackedDebtSecuritiesMember"
      decimals="0"
      unitRef="USD">24132020</us-gaap:ShortTermInvestments>
    <us-gaap:AvailableForSaleSecuritiesDebtSecuritiesCurrent
      contextRef="AsOf2021-06-30_custom_GovernmentBackedDebtSecuritiesMember"
      decimals="0"
      unitRef="USD">24130500</us-gaap:AvailableForSaleSecuritiesDebtSecuritiesCurrent>
    <us-gaap:ShortTermInvestments contextRef="AsOf2021-06-30" decimals="0" unitRef="USD">31927055</us-gaap:ShortTermInvestments>
    <us-gaap:AvailableForSaleSecuritiesDebtSecuritiesCurrent contextRef="AsOf2021-06-30" decimals="0" unitRef="USD">31923285</us-gaap:AvailableForSaleSecuritiesDebtSecuritiesCurrent>
    <CLSN:DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingWithinThreeMonthsAmortizedCost contextRef="AsOf2021-06-30" decimals="0" unitRef="USD">2999420</CLSN:DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingWithinThreeMonthsAmortizedCost>
    <CLSN:DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingWithinThreeMonthsFairValue contextRef="AsOf2021-06-30" decimals="0" unitRef="USD">7792785</CLSN:DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingWithinThreeMonthsFairValue>
    <CLSN:DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingBetweenThreeAndTwelveMonthsAmortizedCost contextRef="AsOf2021-06-30" decimals="0" unitRef="USD">28927635</CLSN:DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingBetweenThreeAndTwelveMonthsAmortizedCost>
    <CLSN:DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingBetweenThreeAndTwelveMonthsFairValue contextRef="AsOf2021-06-30" decimals="0" unitRef="USD">24130500</CLSN:DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingBetweenThreeAndTwelveMonthsFairValue>
    <CLSN:AvailableForSaleDebtSecuritiesAmortizedCostBasisCurrent contextRef="AsOf2021-06-30" decimals="0" unitRef="USD">31927055</CLSN:AvailableForSaleDebtSecuritiesAmortizedCostBasisCurrent>
    <us-gaap:AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate contextRef="AsOf2021-06-30" decimals="0" unitRef="USD">31923285</us-gaap:AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate>
    <us-gaap:ScheduleOfUnrealizedLossOnInvestmentsTableTextBlock contextRef="From2021-01-01to2021-06-30">&lt;p id="xdx_899_eus-gaap--ScheduleOfUnrealizedLossOnInvestmentsTableTextBlock_zoRkyQc8eJSh" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;The
following table shows the Company&#x2019;s investment in debt securities available for sale gross unrealized gains (losses) and fair value
by investment category and length of time that individual securities have been in a continuous unrealized loss position at June 30, 2021
and December 31, 2020. The Company has reviewed individual securities to determine whether a decline in fair value below the amortizable
cost basis is other than temporary.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; display: none; margin: 0; text-align: justify"&gt;&lt;span id="xdx_8BD_zpnMxAxahwPg" style="font: 10pt Times New Roman, Times, Serif"&gt;Summary
of Investment Securities Gross Unrealized Gains (Losses)&lt;/span&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%"&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td style="font-weight: bold; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="6" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;June
    30, 2021&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="6" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;December
    31, 2020&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Available
    for sale securities (all unrealized holding gains and losses are less than 12 months at date of measurement)&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Fair
    Value&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"&gt;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Unrealized
                                            Holding&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Gains
                                            (Losses)&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Fair
    Value&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"&gt;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Unrealized
                                            Holding&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Gains
                                            (Losses)&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="width: 44%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Investments with unrealized gains&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_987_ecustom--AvailableForSaleSecuritiesUnrealizedGainsFairValue_iI_c20210630_z3kP7aYVfYY7" style="width: 11%; text-align: right" title="Investments with unrealized gains, Fair Value"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;5,998,980&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_989_ecustom--AvailableForSaleSecuritiesUnrealizedHoldingGainsLessThanTwelveMonths_iI_c20210630_z73yY5dYjkJj" style="width: 11%; text-align: right" title="Investments with unrealized gains, Unrealized Holding Gains (Losses)"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;1,073&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98E_ecustom--AvailableForSaleSecuritiesUnrealizedGainsFairValue_iI_c20201231_zEUHF5fxggM9" style="width: 9%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0838"&gt;-&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98D_ecustom--AvailableForSaleSecuritiesUnrealizedHoldingGainsLessThanTwelveMonths_iI_c20201231_zJALWk90Uhec" style="width: 9%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0839"&gt;-&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Investments with unrealized
    losses&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98C_ecustom--AvailableForSaleSecuritiesUnrealizedLossFairValue_iI_c20210630_z9UDyW8OCJEh" style="border-bottom: Black 1.5pt solid; text-align: right" title="Investments with unrealized losses, Fair Value"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;25,924,305&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_989_ecustom--AvailableForSaleSecuritiesUnrealizedHoldingLossesLessThanTwelveMonths_iI_c20210630_zlbRJMBli5Vc" style="border-bottom: Black 1.5pt solid; text-align: right" title="Investments with unrealized Losses, Unrealized Holding Gains (Losses)"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;(4,843&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;)&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_980_ecustom--AvailableForSaleSecuritiesUnrealizedLossFairValue_iI_c20201231_zEaBVYTqEBR" style="border-bottom: Black 1.5pt solid; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0844"&gt;-&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98B_ecustom--AvailableForSaleSecuritiesUnrealizedHoldingLossesLessThanTwelveMonths_iI_c20201231_zC9q5gqMTzC2" style="border-bottom: Black 1.5pt solid; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0845"&gt;-&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="padding-left: 10pt; font-weight: bold; padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Total&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_989_eus-gaap--AvailableForSaleSecuritiesDebtSecuritiesCurrent_iI_c20210630_zd1pGBsy9UX3" style="border-bottom: Black 2.5pt double; text-align: right" title="Investment securities, available for sale"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;31,923,285&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_988_ecustom--AvailableForSaleSecuritiesUnrealizedHoldingGainsLossesLessThanTwelveMonths_iI_c20210630_zklx76pw00Xl" style="border-bottom: Black 2.5pt double; text-align: right" title="Investments with unrealized Gains (Losses), Unrealized Holding Gains (Losses)"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;(3,770&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;)&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98E_eus-gaap--AvailableForSaleSecuritiesDebtSecuritiesCurrent_iI_pp0p0_c20201231_zitrNAaI3459" style="border-bottom: Black 2.5pt double; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0850"&gt;-&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98A_ecustom--AvailableForSaleSecuritiesUnrealizedHoldingGainsLossesLessThanTwelveMonths_iI_c20201231_zMBfZ8IjgWek" style="border-bottom: Black 2.5pt double; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0851"&gt;-&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;

</us-gaap:ScheduleOfUnrealizedLossOnInvestmentsTableTextBlock>
    <CLSN:AvailableForSaleSecuritiesUnrealizedGainsFairValue contextRef="AsOf2021-06-30" decimals="0" unitRef="USD">5998980</CLSN:AvailableForSaleSecuritiesUnrealizedGainsFairValue>
    <CLSN:AvailableForSaleSecuritiesUnrealizedHoldingGainsLessThanTwelveMonths contextRef="AsOf2021-06-30" decimals="0" unitRef="USD">1073</CLSN:AvailableForSaleSecuritiesUnrealizedHoldingGainsLessThanTwelveMonths>
    <CLSN:AvailableForSaleSecuritiesUnrealizedLossFairValue contextRef="AsOf2021-06-30" decimals="0" unitRef="USD">25924305</CLSN:AvailableForSaleSecuritiesUnrealizedLossFairValue>
    <CLSN:AvailableForSaleSecuritiesUnrealizedHoldingLossesLessThanTwelveMonths contextRef="AsOf2021-06-30" decimals="0" unitRef="USD">-4843</CLSN:AvailableForSaleSecuritiesUnrealizedHoldingLossesLessThanTwelveMonths>
    <us-gaap:AvailableForSaleSecuritiesDebtSecuritiesCurrent contextRef="AsOf2021-06-30" decimals="0" unitRef="USD">31923285</us-gaap:AvailableForSaleSecuritiesDebtSecuritiesCurrent>
    <CLSN:AvailableForSaleSecuritiesUnrealizedHoldingGainsLossesLessThanTwelveMonths contextRef="AsOf2021-06-30" decimals="0" unitRef="USD">-3770</CLSN:AvailableForSaleSecuritiesUnrealizedHoldingGainsLossesLessThanTwelveMonths>
    <us-gaap:InvestmentIncomeTextBlock contextRef="From2021-01-01to2021-06-30">&lt;p id="xdx_89F_eus-gaap--InvestmentIncomeTextBlock_zFQTOKwfKVCf" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;Investment
(loss) income, which includes net realized losses on sales of available for sale securities and investment income interest and
dividends, is summarized as follows:&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; display: none; margin: 0"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;span id="xdx_8B2_zeRwJVgb5CRk"&gt;Summary
of Net Realized Losses on Sales of Available for Sale Securities and Investment Income Interest and Dividends&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%"&gt;
  &lt;tr style="display: none; vertical-align: bottom"&gt;
    &lt;td style="text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" id="xdx_494_20210401__20210630_zSHyDhyzLjZ6" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;2021&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" id="xdx_493_20200401__20200630_zgTSeZK7Cr9e" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;2020&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom"&gt;
    &lt;td style="text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="6" style="border-bottom: Black 1.5pt solid; text-align: center"&gt;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Three
                                            Months Ended&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;June
                                            30,&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td style="text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;2021&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;2020&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_403_eus-gaap--InvestmentIncomeInterestAndDividend_maIINzj8E_zfdE28HysZqg" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="width: 60%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Interest and dividends accrued
    and paid&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 16%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;1,436&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 16%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;18,095&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_409_eus-gaap--AvailableForSaleSecuritiesGrossRealizedGainLossNet_maIINzj8E_zSqSuTUlXRhc" style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Realized (losses) gains&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1.5pt solid; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;(1,785&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;)&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1.5pt solid; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;2,865&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_403_ecustom--InvestmentIncomeLossNonoperating_iT_pp0p0_mtIINzj8E_zhAI9SQfD4u6" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="text-align: left; padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Investment (loss) income,
    net&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;(349&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;)&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;20,960&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%"&gt;
  &lt;tr style="display: none; vertical-align: bottom"&gt;
    &lt;td style="text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" id="xdx_495_20210101__20210630_zueeupzM32bg" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;2021&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" id="xdx_494_20200101__20200630_zlvHlUejVj51" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;2020&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom"&gt;
    &lt;td style="text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="6" style="border-bottom: Black 1.5pt solid; text-align: center"&gt;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Six
                                            Months Ended&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;June
                                            30,&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td style="text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;2021&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;2020&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_400_eus-gaap--InvestmentIncomeInterestAndDividend_maIINz3xg_z2bCtAatVzL4" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="width: 60%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Interest and dividends accrued
    and paid&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 16%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;3,847&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 16%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;63,172&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40C_eus-gaap--AvailableForSaleSecuritiesGrossRealizedGainLossNet_maIINz3xg_zLf2CPwQ83kc" style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Realized (losses) gains&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1.5pt solid; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;(1,785&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;)&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1.5pt solid; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;46,097&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_402_ecustom--InvestmentIncomeLossNonoperating_iT_mtIINz3xg_zXBNfvUuLAe7" style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left; padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Investment income, net&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;2,062&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;109,269&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40F_ecustom--InvestmentIncomeLossNonoperating_iT_mtIINz3xg_zEY8MspCTele" style="display: none; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left; padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Investment (loss) income,
    net&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;2,062&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;109,269&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;

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    <us-gaap:DerivativesAndFairValueTextBlock contextRef="From2021-01-01to2021-06-30">&lt;p id="xdx_804_eus-gaap--DerivativesAndFairValueTextBlock_zZIO6JLbLlU" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Note
8. &lt;span id="xdx_824_zNUNouQNdgKg"&gt;Fair Value Measurements&lt;/span&gt;&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;FASB
ASC Section 820, &lt;i&gt;Fair Value Measurements and Disclosures&lt;/i&gt; establishes a three-level hierarchy for fair value measurements which
requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. The
three levels of inputs that may be used to measure fair value are as follows:&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 0.5in; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;Level
1: Quoted prices (unadjusted) or identical assets or liabilities in active markets that the entity has the ability to access as of the
measurement date;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 0.5in; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 0.5in; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;Level
2: Significant other observable inputs other than Level 1 prices such as quoted prices for similar assets or liabilities; quoted prices
in markets that are not active; or other inputs that are observable or can be corroborated by observable market data; and&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 0.5in; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 0.5in; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;Level
3: Significant unobservable inputs that reflect a reporting entity&#x2019;s own assumptions that market participants would use in pricing
an asset or liability.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;Cash
and cash equivalents, other current assets, accounts payable and other accrued liabilities are reflected in the condensed consolidated
balance sheet at their approximate estimated fair values primarily due to their short-term nature. The fair values of securities available
for sale is determined by relying on the securities&#x2019; relationship to other benchmark quoted securities and classified its investments
as Level 2 items in both 2021 and 2020. There were no transfers of assets or liabilities between Level 1 and Level 2 and no transfers
in or out of Level 3 during the six-months ended June 30, 2021 or during the year ended December 31, 2020. The changes
in Level 3 liabilities were the result of changes in the fair value of the earn-out milestone liability included in earnings and in-process
R&amp;amp;D. The earnout milestone liability is valued using a risk-adjusted assessment of the probability of payment of each milestone,
discounted to present value using an estimated time to achieve the milestone (see Note 14).&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;




&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p id="xdx_89D_eus-gaap--ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock_z4POuAb1LhXf" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;Assets
and liabilities measured at fair value are summarized below:&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;span id="xdx_8B9_zn5uah0SSVHd" style="display: none"&gt;Schedule
of Fair Value, Assets and Liabilities Measured on Recurring Basis&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%"&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td style="text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Total
    Fair Value&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Quoted
    Prices in Active Markets for Identical Assets/Liabilities (Level 1)&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"&gt;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Significant
                                            Other Observable Inputs&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;(Level
                                            2)&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"&gt;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Significant
                                            Unobservable Inputs&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;(Level
                                            3)&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Assets:&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Recurring items as of June 30, 2021&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="padding-left: 10pt; width: 40%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Investment
    in debt securities - available for sale, at fair value&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98D_eus-gaap--AvailableForSaleSecuritiesDebtSecuritiesCurrent_c20210630__us-gaap--FairValueByMeasurementFrequencyAxis__us-gaap--FairValueMeasurementsRecurringMember__us-gaap--FinancialInstrumentAxis__us-gaap--CorporateDebtSecuritiesMember_pp0p0" style="width: 11%; text-align: right" title="Investment securities, available for sale"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;31,923,285&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_983_eus-gaap--AvailableForSaleSecuritiesDebtSecuritiesCurrent_c20210630__us-gaap--FairValueByMeasurementFrequencyAxis__us-gaap--FairValueMeasurementsRecurringMember__us-gaap--FairValueByFairValueHierarchyLevelAxis__us-gaap--FairValueInputsLevel1Member__us-gaap--FinancialInstrumentAxis__us-gaap--CorporateDebtSecuritiesMember_pp0p0" style="width: 11%; text-align: right" title="Investment securities, available for sale"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0882"&gt;&#x2013;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_980_eus-gaap--AvailableForSaleSecuritiesDebtSecuritiesCurrent_c20210630__us-gaap--FairValueByMeasurementFrequencyAxis__us-gaap--FairValueMeasurementsRecurringMember__us-gaap--FairValueByFairValueHierarchyLevelAxis__us-gaap--FairValueInputsLevel2Member__us-gaap--FinancialInstrumentAxis__us-gaap--CorporateDebtSecuritiesMember_pp0p0" style="width: 11%; text-align: right" title="Investment securities, available for sale"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;31,923,285&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_981_eus-gaap--AvailableForSaleSecuritiesDebtSecuritiesCurrent_c20210630__us-gaap--FairValueByMeasurementFrequencyAxis__us-gaap--FairValueMeasurementsRecurringMember__us-gaap--FairValueByFairValueHierarchyLevelAxis__us-gaap--FairValueInputsLevel3Member__us-gaap--FinancialInstrumentAxis__us-gaap--CorporateDebtSecuritiesMember_pp0p0" style="width: 11%; text-align: right" title="Investment securities, available for sale"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0886"&gt;&#x2013;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Non-recurring items as of June 30, 2021&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="padding-left: 10pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;In-process R&amp;amp;D (Note
    9)&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_989_eus-gaap--AvailableForSaleSecuritiesDebtSecuritiesCurrent_c20210630__us-gaap--FairValueByMeasurementFrequencyAxis__us-gaap--FairValueMeasurementsNonrecurringMember__us-gaap--FinancialInstrumentAxis__custom--InprocessRandDMember_pp0p0" style="text-align: right" title="Investment securities, available for sale"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;13,366,234&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_980_eus-gaap--AvailableForSaleSecuritiesDebtSecuritiesCurrent_c20210630__us-gaap--FairValueByMeasurementFrequencyAxis__us-gaap--FairValueMeasurementsNonrecurringMember__us-gaap--FairValueByFairValueHierarchyLevelAxis__us-gaap--FairValueInputsLevel1Member__us-gaap--FinancialInstrumentAxis__custom--InprocessRandDMember_pp0p0" style="text-align: right" title="Investment securities, available for sale"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0890"&gt;&#x2013;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_981_eus-gaap--AvailableForSaleSecuritiesDebtSecuritiesCurrent_c20210630__us-gaap--FairValueByMeasurementFrequencyAxis__us-gaap--FairValueMeasurementsNonrecurringMember__us-gaap--FairValueByFairValueHierarchyLevelAxis__us-gaap--FairValueInputsLevel2Member__us-gaap--FinancialInstrumentAxis__custom--InprocessRandDMember_pp0p0" style="text-align: right" title="Investment securities, available for sale"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0892"&gt;&#x2013;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_986_eus-gaap--AvailableForSaleSecuritiesDebtSecuritiesCurrent_c20210630__us-gaap--FairValueByMeasurementFrequencyAxis__us-gaap--FairValueMeasurementsNonrecurringMember__us-gaap--FairValueByFairValueHierarchyLevelAxis__us-gaap--FairValueInputsLevel3Member__us-gaap--FinancialInstrumentAxis__custom--InprocessRandDMember_pp0p0" style="text-align: right" title="Investment securities, available for sale"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;13,366,234&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Non-recurring items as of December 31, 2020&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="padding-left: 10pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;In-process R&amp;amp;D (Note
    9)&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98C_eus-gaap--AvailableForSaleSecuritiesDebtSecuritiesCurrent_c20201231__us-gaap--FairValueByMeasurementFrequencyAxis__us-gaap--FairValueMeasurementsNonrecurringMember__us-gaap--FinancialInstrumentAxis__custom--InprocessRandDMember_pp0p0" style="text-align: right" title="Investment securities, available for sale"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;13,366,234&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98C_eus-gaap--AvailableForSaleSecuritiesDebtSecuritiesCurrent_c20201231__us-gaap--FairValueByMeasurementFrequencyAxis__us-gaap--FairValueMeasurementsNonrecurringMember__us-gaap--FairValueByFairValueHierarchyLevelAxis__us-gaap--FairValueInputsLevel1Member__us-gaap--FinancialInstrumentAxis__custom--InprocessRandDMember_pp0p0" style="text-align: right" title="Investment securities, available for sale"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0898"&gt;&#x2013;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_982_eus-gaap--AvailableForSaleSecuritiesDebtSecuritiesCurrent_c20201231__us-gaap--FairValueByMeasurementFrequencyAxis__us-gaap--FairValueMeasurementsNonrecurringMember__us-gaap--FairValueByFairValueHierarchyLevelAxis__us-gaap--FairValueInputsLevel2Member__us-gaap--FinancialInstrumentAxis__custom--InprocessRandDMember_pp0p0" style="text-align: right" title="Investment securities, available for sale"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0900"&gt;&#x2013;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_983_eus-gaap--AvailableForSaleSecuritiesDebtSecuritiesCurrent_c20201231__us-gaap--FairValueByMeasurementFrequencyAxis__us-gaap--FairValueMeasurementsNonrecurringMember__us-gaap--FairValueByFairValueHierarchyLevelAxis__us-gaap--FairValueInputsLevel3Member__us-gaap--FinancialInstrumentAxis__custom--InprocessRandDMember_pp0p0" style="text-align: right" title="Investment securities, available for sale"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;13,366,234&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Liabilities:&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Recurring items as of June 30, 2021&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="padding-left: 10pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Earn-out milestone liability
    (Note 14)&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_982_eus-gaap--BusinessCombinationContingentConsiderationLiabilityNoncurrent_c20210630__us-gaap--FairValueByMeasurementFrequencyAxis__us-gaap--FairValueMeasurementsRecurringMember_pp0p0" style="text-align: right" title="Earn-out milestone liability"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;7,088,000&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_983_eus-gaap--BusinessCombinationContingentConsiderationLiabilityNoncurrent_c20210630__us-gaap--FairValueByMeasurementFrequencyAxis__us-gaap--FairValueMeasurementsRecurringMember__us-gaap--FairValueByFairValueHierarchyLevelAxis__us-gaap--FairValueInputsLevel1Member_pp0p0" style="text-align: right" title="Earn-out milestone liability"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0906"&gt;&#x2013;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_982_eus-gaap--BusinessCombinationContingentConsiderationLiabilityNoncurrent_c20210630__us-gaap--FairValueByMeasurementFrequencyAxis__us-gaap--FairValueMeasurementsRecurringMember__us-gaap--FairValueByFairValueHierarchyLevelAxis__us-gaap--FairValueInputsLevel2Member_pp0p0" style="text-align: right" title="Earn-out milestone liability"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0908"&gt;&#x2013;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_981_eus-gaap--BusinessCombinationContingentConsiderationLiabilityNoncurrent_c20210630__us-gaap--FairValueByMeasurementFrequencyAxis__us-gaap--FairValueMeasurementsRecurringMember__us-gaap--FairValueByFairValueHierarchyLevelAxis__us-gaap--FairValueInputsLevel3Member_pp0p0" style="text-align: right" title="Earn-out milestone liability"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;7,088,000&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Recurring items as of December 31, 2020&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="padding-left: 10pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Earn-out milestone liability
    (Note 14)&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_987_eus-gaap--BusinessCombinationContingentConsiderationLiabilityNoncurrent_c20201231__us-gaap--FairValueByMeasurementFrequencyAxis__us-gaap--FairValueMeasurementsRecurringMember_pp0p0" style="text-align: right" title="Earn-out milestone liability"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;7,018,000&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98F_eus-gaap--BusinessCombinationContingentConsiderationLiabilityNoncurrent_c20201231__us-gaap--FairValueByMeasurementFrequencyAxis__us-gaap--FairValueMeasurementsRecurringMember__us-gaap--FairValueByFairValueHierarchyLevelAxis__us-gaap--FairValueInputsLevel1Member_pp0p0" style="text-align: right" title="Earn-out milestone liability"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0914"&gt;&#x2013;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98C_eus-gaap--BusinessCombinationContingentConsiderationLiabilityNoncurrent_c20201231__us-gaap--FairValueByMeasurementFrequencyAxis__us-gaap--FairValueMeasurementsRecurringMember__us-gaap--FairValueByFairValueHierarchyLevelAxis__us-gaap--FairValueInputsLevel2Member_pp0p0" style="text-align: right" title="Earn-out milestone liability"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0916"&gt;&#x2013;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98D_eus-gaap--BusinessCombinationContingentConsiderationLiabilityNoncurrent_c20201231__us-gaap--FairValueByMeasurementFrequencyAxis__us-gaap--FairValueMeasurementsRecurringMember__us-gaap--FairValueByFairValueHierarchyLevelAxis__us-gaap--FairValueInputsLevel3Member_pp0p0" style="text-align: right" title="Earn-out milestone liability"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;7,018,000&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;

&lt;p id="xdx_8A1_z2PtZt8SCfn" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

</us-gaap:DerivativesAndFairValueTextBlock>
    <us-gaap:ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock contextRef="From2021-01-01to2021-06-30">&lt;p id="xdx_89D_eus-gaap--ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock_z4POuAb1LhXf" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;Assets
and liabilities measured at fair value are summarized below:&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;span id="xdx_8B9_zn5uah0SSVHd" style="display: none"&gt;Schedule
of Fair Value, Assets and Liabilities Measured on Recurring Basis&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%"&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td style="text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Total
    Fair Value&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Quoted
    Prices in Active Markets for Identical Assets/Liabilities (Level 1)&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"&gt;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Significant
                                            Other Observable Inputs&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;(Level
                                            2)&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"&gt;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Significant
                                            Unobservable Inputs&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;(Level
                                            3)&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Assets:&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Recurring items as of June 30, 2021&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="padding-left: 10pt; width: 40%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Investment
    in debt securities - available for sale, at fair value&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98D_eus-gaap--AvailableForSaleSecuritiesDebtSecuritiesCurrent_c20210630__us-gaap--FairValueByMeasurementFrequencyAxis__us-gaap--FairValueMeasurementsRecurringMember__us-gaap--FinancialInstrumentAxis__us-gaap--CorporateDebtSecuritiesMember_pp0p0" style="width: 11%; text-align: right" title="Investment securities, available for sale"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;31,923,285&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_983_eus-gaap--AvailableForSaleSecuritiesDebtSecuritiesCurrent_c20210630__us-gaap--FairValueByMeasurementFrequencyAxis__us-gaap--FairValueMeasurementsRecurringMember__us-gaap--FairValueByFairValueHierarchyLevelAxis__us-gaap--FairValueInputsLevel1Member__us-gaap--FinancialInstrumentAxis__us-gaap--CorporateDebtSecuritiesMember_pp0p0" style="width: 11%; text-align: right" title="Investment securities, available for sale"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0882"&gt;&#x2013;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_980_eus-gaap--AvailableForSaleSecuritiesDebtSecuritiesCurrent_c20210630__us-gaap--FairValueByMeasurementFrequencyAxis__us-gaap--FairValueMeasurementsRecurringMember__us-gaap--FairValueByFairValueHierarchyLevelAxis__us-gaap--FairValueInputsLevel2Member__us-gaap--FinancialInstrumentAxis__us-gaap--CorporateDebtSecuritiesMember_pp0p0" style="width: 11%; text-align: right" title="Investment securities, available for sale"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;31,923,285&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_981_eus-gaap--AvailableForSaleSecuritiesDebtSecuritiesCurrent_c20210630__us-gaap--FairValueByMeasurementFrequencyAxis__us-gaap--FairValueMeasurementsRecurringMember__us-gaap--FairValueByFairValueHierarchyLevelAxis__us-gaap--FairValueInputsLevel3Member__us-gaap--FinancialInstrumentAxis__us-gaap--CorporateDebtSecuritiesMember_pp0p0" style="width: 11%; text-align: right" title="Investment securities, available for sale"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0886"&gt;&#x2013;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Non-recurring items as of June 30, 2021&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="padding-left: 10pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;In-process R&amp;amp;D (Note
    9)&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_989_eus-gaap--AvailableForSaleSecuritiesDebtSecuritiesCurrent_c20210630__us-gaap--FairValueByMeasurementFrequencyAxis__us-gaap--FairValueMeasurementsNonrecurringMember__us-gaap--FinancialInstrumentAxis__custom--InprocessRandDMember_pp0p0" style="text-align: right" title="Investment securities, available for sale"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;13,366,234&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_980_eus-gaap--AvailableForSaleSecuritiesDebtSecuritiesCurrent_c20210630__us-gaap--FairValueByMeasurementFrequencyAxis__us-gaap--FairValueMeasurementsNonrecurringMember__us-gaap--FairValueByFairValueHierarchyLevelAxis__us-gaap--FairValueInputsLevel1Member__us-gaap--FinancialInstrumentAxis__custom--InprocessRandDMember_pp0p0" style="text-align: right" title="Investment securities, available for sale"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0890"&gt;&#x2013;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_981_eus-gaap--AvailableForSaleSecuritiesDebtSecuritiesCurrent_c20210630__us-gaap--FairValueByMeasurementFrequencyAxis__us-gaap--FairValueMeasurementsNonrecurringMember__us-gaap--FairValueByFairValueHierarchyLevelAxis__us-gaap--FairValueInputsLevel2Member__us-gaap--FinancialInstrumentAxis__custom--InprocessRandDMember_pp0p0" style="text-align: right" title="Investment securities, available for sale"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0892"&gt;&#x2013;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_986_eus-gaap--AvailableForSaleSecuritiesDebtSecuritiesCurrent_c20210630__us-gaap--FairValueByMeasurementFrequencyAxis__us-gaap--FairValueMeasurementsNonrecurringMember__us-gaap--FairValueByFairValueHierarchyLevelAxis__us-gaap--FairValueInputsLevel3Member__us-gaap--FinancialInstrumentAxis__custom--InprocessRandDMember_pp0p0" style="text-align: right" title="Investment securities, available for sale"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;13,366,234&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Non-recurring items as of December 31, 2020&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="padding-left: 10pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;In-process R&amp;amp;D (Note
    9)&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98C_eus-gaap--AvailableForSaleSecuritiesDebtSecuritiesCurrent_c20201231__us-gaap--FairValueByMeasurementFrequencyAxis__us-gaap--FairValueMeasurementsNonrecurringMember__us-gaap--FinancialInstrumentAxis__custom--InprocessRandDMember_pp0p0" style="text-align: right" title="Investment securities, available for sale"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;13,366,234&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98C_eus-gaap--AvailableForSaleSecuritiesDebtSecuritiesCurrent_c20201231__us-gaap--FairValueByMeasurementFrequencyAxis__us-gaap--FairValueMeasurementsNonrecurringMember__us-gaap--FairValueByFairValueHierarchyLevelAxis__us-gaap--FairValueInputsLevel1Member__us-gaap--FinancialInstrumentAxis__custom--InprocessRandDMember_pp0p0" style="text-align: right" title="Investment securities, available for sale"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0898"&gt;&#x2013;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_982_eus-gaap--AvailableForSaleSecuritiesDebtSecuritiesCurrent_c20201231__us-gaap--FairValueByMeasurementFrequencyAxis__us-gaap--FairValueMeasurementsNonrecurringMember__us-gaap--FairValueByFairValueHierarchyLevelAxis__us-gaap--FairValueInputsLevel2Member__us-gaap--FinancialInstrumentAxis__custom--InprocessRandDMember_pp0p0" style="text-align: right" title="Investment securities, available for sale"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0900"&gt;&#x2013;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_983_eus-gaap--AvailableForSaleSecuritiesDebtSecuritiesCurrent_c20201231__us-gaap--FairValueByMeasurementFrequencyAxis__us-gaap--FairValueMeasurementsNonrecurringMember__us-gaap--FairValueByFairValueHierarchyLevelAxis__us-gaap--FairValueInputsLevel3Member__us-gaap--FinancialInstrumentAxis__custom--InprocessRandDMember_pp0p0" style="text-align: right" title="Investment securities, available for sale"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;13,366,234&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Liabilities:&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Recurring items as of June 30, 2021&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="padding-left: 10pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Earn-out milestone liability
    (Note 14)&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_982_eus-gaap--BusinessCombinationContingentConsiderationLiabilityNoncurrent_c20210630__us-gaap--FairValueByMeasurementFrequencyAxis__us-gaap--FairValueMeasurementsRecurringMember_pp0p0" style="text-align: right" title="Earn-out milestone liability"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;7,088,000&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_983_eus-gaap--BusinessCombinationContingentConsiderationLiabilityNoncurrent_c20210630__us-gaap--FairValueByMeasurementFrequencyAxis__us-gaap--FairValueMeasurementsRecurringMember__us-gaap--FairValueByFairValueHierarchyLevelAxis__us-gaap--FairValueInputsLevel1Member_pp0p0" style="text-align: right" title="Earn-out milestone liability"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0906"&gt;&#x2013;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_982_eus-gaap--BusinessCombinationContingentConsiderationLiabilityNoncurrent_c20210630__us-gaap--FairValueByMeasurementFrequencyAxis__us-gaap--FairValueMeasurementsRecurringMember__us-gaap--FairValueByFairValueHierarchyLevelAxis__us-gaap--FairValueInputsLevel2Member_pp0p0" style="text-align: right" title="Earn-out milestone liability"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0908"&gt;&#x2013;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_981_eus-gaap--BusinessCombinationContingentConsiderationLiabilityNoncurrent_c20210630__us-gaap--FairValueByMeasurementFrequencyAxis__us-gaap--FairValueMeasurementsRecurringMember__us-gaap--FairValueByFairValueHierarchyLevelAxis__us-gaap--FairValueInputsLevel3Member_pp0p0" style="text-align: right" title="Earn-out milestone liability"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;7,088,000&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Recurring items as of December 31, 2020&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="padding-left: 10pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Earn-out milestone liability
    (Note 14)&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_987_eus-gaap--BusinessCombinationContingentConsiderationLiabilityNoncurrent_c20201231__us-gaap--FairValueByMeasurementFrequencyAxis__us-gaap--FairValueMeasurementsRecurringMember_pp0p0" style="text-align: right" title="Earn-out milestone liability"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;7,018,000&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98F_eus-gaap--BusinessCombinationContingentConsiderationLiabilityNoncurrent_c20201231__us-gaap--FairValueByMeasurementFrequencyAxis__us-gaap--FairValueMeasurementsRecurringMember__us-gaap--FairValueByFairValueHierarchyLevelAxis__us-gaap--FairValueInputsLevel1Member_pp0p0" style="text-align: right" title="Earn-out milestone liability"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0914"&gt;&#x2013;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98C_eus-gaap--BusinessCombinationContingentConsiderationLiabilityNoncurrent_c20201231__us-gaap--FairValueByMeasurementFrequencyAxis__us-gaap--FairValueMeasurementsRecurringMember__us-gaap--FairValueByFairValueHierarchyLevelAxis__us-gaap--FairValueInputsLevel2Member_pp0p0" style="text-align: right" title="Earn-out milestone liability"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0916"&gt;&#x2013;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98D_eus-gaap--BusinessCombinationContingentConsiderationLiabilityNoncurrent_c20201231__us-gaap--FairValueByMeasurementFrequencyAxis__us-gaap--FairValueMeasurementsRecurringMember__us-gaap--FairValueByFairValueHierarchyLevelAxis__us-gaap--FairValueInputsLevel3Member_pp0p0" style="text-align: right" title="Earn-out milestone liability"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;7,018,000&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;

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    <us-gaap:IntangibleAssetsDisclosureTextBlock contextRef="From2021-01-01to2021-06-30">&lt;p id="xdx_804_eus-gaap--IntangibleAssetsDisclosureTextBlock_zzoxOLipmjol" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Note
9. &lt;span id="xdx_822_zYNgm3e1UdA8"&gt;Intangible Assets&lt;/span&gt;&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;In
June 2014, we completed the acquisition of substantially all of the assets of EGEN, Inc., an Alabama corporation, which has changed its
company name to EGWU, Inc. after the closing of the acquisition (&#x201c;EGEN&#x201d;). We acquired all of EGEN&#x2019;s right, title and
interest in and to substantially all of the assets of EGEN, including cash and cash equivalents, patents, trademarks and other intellectual
property rights, clinical data, certain contracts, licenses and permits, equipment, furniture, office equipment, furnishings, supplies
and other tangible personal property. In addition, CLSN Laboratories assumed certain specified liabilities of EGEN, including the liabilities
arising out of the acquired contracts and other assets relating to periods after the closing date.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;i&gt;Acquired
In-process Research and Development&lt;/i&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;Acquired
in-process research and development (IPR&amp;amp;D) consists of EGEN&#x2019;s drug technology platforms: TheraPlas and TheraSilence. The fair
value of the IPR&amp;amp;D drug technology platforms was estimated to be $&lt;span id="xdx_909_eus-gaap--IndefinitelivedIntangibleAssetsAcquired_pn5n6_c20210101__20210630__us-gaap--BusinessAcquisitionAxis__custom--EGENIncMember__dei--LegalEntityAxis__custom--IPRAndDDrugTechnologyPlatformsMember_zPvuzEz64MBa"&gt;24.2
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;million as of the acquisition date. As of the
closing of the acquisition, the IPR&amp;amp;D was considered indefinite lived intangible assets and will not be amortized. IPR&amp;amp;D is reviewed
for impairment at least annually as of our third quarter ended September 30, and whenever events or changes in circumstances indicate
that the carrying value of the assets might not be recoverable. The Company&#x2019;s IPR&amp;amp;D consisted of three core elements, its RNA
delivery system, its glioblastoma multiforme cancer (GBM) product candidate and its ovarian cancer indication.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;The
Company&#x2019;s ovarian cancer indication, with original value of $&lt;span id="xdx_906_eus-gaap--FinitelivedIntangibleAssetsAcquired1_pn5n6_c20210101__20210630__dei--LegalEntityAxis__custom--IPRAndDDrugTechnologyPlatformsMember__us-gaap--ContingentConsiderationByTypeAxis__custom--OvarianCancerMember_z1ajCb1WHJab"&gt;13.3
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;million has not been impaired since its acquisition.
At September 30, 2020, the Company evaluated its IPR&amp;amp;D of the ovarian cancer indication and concluded that it is not more likely
than not that the asset is impaired. As no other indicators of impairment existed during the fourth quarter of 2020 or first half of
2021, &lt;span id="xdx_902_eus-gaap--AssetImpairmentCharges_pp0p0_do_c20200101__20200630__dei--LegalEntityAxis__custom--IPRAndDDrugTechnologyPlatformsMember_zJ7zEOjzxcC2"&gt;no
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;impairment charges were recorded during the three
or six-months ended June 30, 2021 and 2020.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;The
Company&#x2019;s GBM candidate, with original value of $&lt;span id="xdx_906_eus-gaap--AssetImpairmentCharges_pn5n6_c20180101__20181231__us-gaap--BusinessAcquisitionAxis__custom--EGENIncMember__us-gaap--ContingentConsiderationByTypeAxis__custom--GlioblastomaMultiformeBrainCancerMember_zaIkrUUgDVj1"&gt;9.4
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;million had cumulative impairments through 2018
of $&lt;span id="xdx_90C_eus-gaap--AssetImpairmentCharges_pn6n6_c20180101__20181231__us-gaap--BusinessAcquisitionAxis__custom--EGENIncMember_zgFV6MHTYqJ9"&gt;7
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;million, with remaining carrying value of $&lt;span id="xdx_909_eus-gaap--AssetImpairmentCharges_pn5n6_c20190101__20191231__us-gaap--ContingentConsiderationByTypeAxis__custom--GlioblastomaMultiformeBrainCancerMember_zM9mLehGFYvb"&gt;2.4
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;million at December 31, 2019. On September 30,
2020, the Company evaluated its IPR&amp;amp;D for the (GBM) product candidate and concluded that it is more likely than not that the asset
is further impaired. After this assessment on September 30, 2020, the Company wrote off the remaining $&lt;span id="xdx_907_eus-gaap--AssetImpairmentCharges_pn5n6_c20200929__20200930__us-gaap--BusinessAcquisitionAxis__custom--EGENIncMember__us-gaap--ContingentConsiderationByTypeAxis__custom--GlioblastomaMultiformeBrainCancerMember_zhIpPkbMlpC8"&gt;2.4
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;million of this asset, thereby recognizing a
non-cash charge of $&lt;span id="xdx_90F_ecustom--NoncashCharge_pn5n6_c20200701__20200930__us-gaap--BusinessAcquisitionAxis__custom--EGENIncMember__us-gaap--ContingentConsiderationByTypeAxis__custom--GlioblastomaMultiformeBrainCancerMember_zlGEsTTp0Mjh"&gt;2.4
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;million in the third quarter of 2020.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;




&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;i&gt;&#160;&lt;/i&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;i&gt;Covenants
Not to Compete&lt;/i&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;Pursuant
to the EGEN Purchase Agreement, EGEN provided certain covenants (&#x201c;Covenant Not To Compete&#x201d;) to the Company whereby EGEN agreed,
during the period ending on the seventh anniversary of the closing date of the acquisition on June 20, 2014, not to enter into any business,
directly or indirectly, which competes with the business of the Company nor will it contact, solicit or approach any of the employees
of the Company for purposes of offering employment. The Covenant Not to Compete which was valued at approximately $&lt;span id="xdx_90F_eus-gaap--FinitelivedIntangibleAssetsAcquired1_pn5n6_c20210101__20210630__us-gaap--BusinessAcquisitionAxis__custom--EGENIncMember__us-gaap--TypeOfArrangementAxis__custom--PurchaseAgreementMember_zElAFzn39hja"&gt;1.6
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;million at the date of the EGEN acquisition has
a definitive life and is amortized on a straight-line basis over its life of &lt;span id="xdx_90D_eus-gaap--FiniteLivedIntangibleAssetUsefulLife_dtY_c20210101__20210630__us-gaap--BusinessAcquisitionAxis__custom--EGENIncMember__us-gaap--TypeOfArrangementAxis__custom--PurchaseAgreementMember_zPPMeop8zcDl"&gt;7
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;years. The Company recognized amortization expense
of $&lt;span id="xdx_90B_eus-gaap--AdjustmentForAmortization_c20200101__20200630__us-gaap--BusinessAcquisitionAxis__custom--EGENIncMember__us-gaap--TypeOfArrangementAxis__custom--PurchaseAgreementMember_zyI2tWwnXl1e"&gt;56,830
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;in each of the three and six-month periods ended
June 30, 2021 and 2020. The carrying value of the Covenant Not to Compete was fully amortized as of June 30, 2021 and $&lt;span id="xdx_90E_eus-gaap--FiniteLivedIntangibleAssetsNet_c20201231__us-gaap--TypeOfArrangementAxis__custom--AspirePurchaseAgreementsMember_pp0p0"&gt;113,660&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;,
net of $&lt;span id="xdx_90C_eus-gaap--FiniteLivedIntangibleAssetsAccumulatedAmortization_c20201231__us-gaap--TypeOfArrangementAxis__custom--AspirePurchaseAgreementsMember_pp0p0"&gt;1,477,554
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;accumulated amortization, as of December 31,
2020.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;i&gt;Goodwill&lt;/i&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;The
purchase price exceeded the estimated fair value of the net assets acquired by approximately $&lt;span id="xdx_909_eus-gaap--GoodwillAcquiredDuringPeriod_pn5n6_c20210101__20210630__us-gaap--BusinessAcquisitionAxis__custom--EGENIncMember_z3Tt7kqvnD75"&gt;2.0
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;million which was recorded as Goodwill. Goodwill
represents the difference between the total purchase price for the net assets purchased from EGEN and the aggregate fair values of tangible
and intangible assets acquired, less liabilities assumed. Goodwill is reviewed for impairment at least annually as of our third quarter
ended September 30 or sooner if we believe indicators of impairment exist. As of June 30, 2021, we concluded that the Company&#x2019;s
fair value exceeded its carrying value therefore &#x201c;it is not more likely than not&#x201d; that the Goodwill was impaired.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p id="xdx_894_eus-gaap--FiniteLivedAndIndefiniteLivedIntangibleAssetsAcquiredAsPartOfBusinessCombinationTableTextBlock_zdYgJeGkoxUh" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;Following
is a summary of the net fair value of the assets acquired in the EGEN asset acquisition for the six-month period ended June 30,
2021:&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;span id="xdx_8BB_ztRGk8i77Aa6" style="display: none"&gt;Schedule
of Fair Value of Assets Acquired&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%"&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td style="text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;IPR&amp;amp;D&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Goodwill&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Covenant
    Not To Compete&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;For the six-months ended June 30,
    2021&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="width: 46%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Balance at January 1, 2021, net&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_986_eus-gaap--FiniteLivedIntangibleAssetsNet_iS_pp0p0_c20210101__20210630__us-gaap--FairValueByAssetClassAxis__custom--IPRAndDMember_zjQ3JIkxxDj7" style="width: 14%; text-align: right" title="Intangible assets, beginning balance"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;13,366,234&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98E_eus-gaap--FiniteLivedIntangibleAssetsNet_iS_pp0p0_c20210101__20210630__us-gaap--FairValueByAssetClassAxis__us-gaap--GoodwillMember_zNBWiGj7paVi" style="width: 14%; text-align: right" title="Intangible assets, beginning balance"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;1,976,101&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98E_eus-gaap--FiniteLivedIntangibleAssetsNet_iS_pp0p0_c20210101__20210630__us-gaap--FiniteLivedIntangibleAssetsByMajorClassAxis__us-gaap--NoncompeteAgreementsMember_zdqB8nlRBX59" style="width: 14%; text-align: right" title="Intangible assets, beginning balance"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;113,660&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Amortization&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_986_eus-gaap--AmortizationOfIntangibleAssets_iN_pp0p0_di_c20210101__20210630__us-gaap--FairValueByAssetClassAxis__custom--IPRAndDMember_z7TzeeSXjI5a" style="border-bottom: Black 1.5pt solid; text-align: right" title="Amortization"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0944"&gt;-&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98D_eus-gaap--AmortizationOfIntangibleAssets_iN_pp0p0_di_c20210101__20210630__us-gaap--FairValueByAssetClassAxis__us-gaap--GoodwillMember_zjtx3T7G2Lgi" style="border-bottom: Black 1.5pt solid; text-align: right" title="Amortization"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0946"&gt;-&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_982_eus-gaap--AmortizationOfIntangibleAssets_iN_pp0p0_di_c20210101__20210630__us-gaap--FiniteLivedIntangibleAssetsByMajorClassAxis__us-gaap--NoncompeteAgreementsMember_zNQ4n0vGQP99" style="border-bottom: Black 1.5pt solid; text-align: right" title="Amortization"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;(113,660&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;)&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left; padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Balance at June 30,
    2021, net&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98A_eus-gaap--FiniteLivedIntangibleAssetsNet_iE_pp0p0_c20210101__20210630__us-gaap--FairValueByAssetClassAxis__custom--IPRAndDMember_zZEW29lairU1" style="border-bottom: Black 2.5pt double; text-align: right" title="Intangible assets, ending balance"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;13,366,234&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_983_eus-gaap--FiniteLivedIntangibleAssetsNet_iE_pp0p0_c20210101__20210630__us-gaap--FairValueByAssetClassAxis__us-gaap--GoodwillMember_z0nQAbP1KtYl" style="border-bottom: Black 2.5pt double; text-align: right" title="Intangible assets, ending balance"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;1,976,101&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98F_eus-gaap--FiniteLivedIntangibleAssetsNet_iE_pp0p0_c20210101__20210630__us-gaap--FiniteLivedIntangibleAssetsByMajorClassAxis__us-gaap--NoncompeteAgreementsMember_zr55ihcRj1a4" style="border-bottom: Black 2.5pt double; text-align: right" title="Intangible assets, ending balance"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0954"&gt;-&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;

&lt;p id="xdx_8A4_z0domUgEPXS2" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

</us-gaap:IntangibleAssetsDisclosureTextBlock>
    <us-gaap:IndefinitelivedIntangibleAssetsAcquired
      contextRef="From2021-01-012021-06-30_custom_EGENIncMember_custom_IPRAndDDrugTechnologyPlatformsMember"
      decimals="-5"
      unitRef="USD">24200000</us-gaap:IndefinitelivedIntangibleAssetsAcquired>
    <us-gaap:FinitelivedIntangibleAssetsAcquired1
      contextRef="From2021-01-012021-06-30_custom_IPRAndDDrugTechnologyPlatformsMember_custom_OvarianCancerMember"
      decimals="-5"
      unitRef="USD">13300000</us-gaap:FinitelivedIntangibleAssetsAcquired1>
    <us-gaap:AssetImpairmentCharges
      contextRef="From2018-01-012018-12-31_custom_EGENIncMember_custom_GlioblastomaMultiformeBrainCancerMember"
      decimals="-5"
      unitRef="USD">9400000</us-gaap:AssetImpairmentCharges>
    <us-gaap:AssetImpairmentCharges
      contextRef="From2018-01-012018-12-31_custom_EGENIncMember"
      decimals="-6"
      unitRef="USD">7000000</us-gaap:AssetImpairmentCharges>
    <us-gaap:AssetImpairmentCharges
      contextRef="From2019-01-012019-12-31_custom_GlioblastomaMultiformeBrainCancerMember"
      decimals="-5"
      unitRef="USD">2400000</us-gaap:AssetImpairmentCharges>
    <us-gaap:AssetImpairmentCharges
      contextRef="From2020-09-292020-09-30_custom_EGENIncMember_custom_GlioblastomaMultiformeBrainCancerMember"
      decimals="-5"
      unitRef="USD">2400000</us-gaap:AssetImpairmentCharges>
    <CLSN:NoncashCharge
      contextRef="From2020-07-012020-09-30_custom_EGENIncMember_custom_GlioblastomaMultiformeBrainCancerMember"
      decimals="-5"
      unitRef="USD">2400000</CLSN:NoncashCharge>
    <us-gaap:FinitelivedIntangibleAssetsAcquired1
      contextRef="From2021-01-012021-06-30_custom_EGENIncMember_custom_PurchaseAgreementMember"
      decimals="-5"
      unitRef="USD">1600000</us-gaap:FinitelivedIntangibleAssetsAcquired1>
    <us-gaap:FiniteLivedIntangibleAssetUsefulLife contextRef="From2021-01-012021-06-30_custom_EGENIncMember_custom_PurchaseAgreementMember">P7Y</us-gaap:FiniteLivedIntangibleAssetUsefulLife>
    <us-gaap:AdjustmentForAmortization
      contextRef="From2020-01-012020-06-30_custom_EGENIncMember_custom_PurchaseAgreementMember"
      decimals="0"
      unitRef="USD">56830</us-gaap:AdjustmentForAmortization>
    <us-gaap:FiniteLivedIntangibleAssetsNet
      contextRef="AsOf2020-12-31_custom_AspirePurchaseAgreementsMember"
      decimals="0"
      unitRef="USD">113660</us-gaap:FiniteLivedIntangibleAssetsNet>
    <us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization
      contextRef="AsOf2020-12-31_custom_AspirePurchaseAgreementsMember"
      decimals="0"
      unitRef="USD">1477554</us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization>
    <us-gaap:GoodwillAcquiredDuringPeriod
      contextRef="From2021-01-012021-06-30_custom_EGENIncMember"
      decimals="-5"
      unitRef="USD">2000000.0</us-gaap:GoodwillAcquiredDuringPeriod>
    <us-gaap:FiniteLivedAndIndefiniteLivedIntangibleAssetsAcquiredAsPartOfBusinessCombinationTableTextBlock contextRef="From2021-01-01to2021-06-30">&lt;p id="xdx_894_eus-gaap--FiniteLivedAndIndefiniteLivedIntangibleAssetsAcquiredAsPartOfBusinessCombinationTableTextBlock_zdYgJeGkoxUh" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;Following
is a summary of the net fair value of the assets acquired in the EGEN asset acquisition for the six-month period ended June 30,
2021:&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;span id="xdx_8BB_ztRGk8i77Aa6" style="display: none"&gt;Schedule
of Fair Value of Assets Acquired&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%"&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td style="text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;IPR&amp;amp;D&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Goodwill&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Covenant
    Not To Compete&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;For the six-months ended June 30,
    2021&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="width: 46%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Balance at January 1, 2021, net&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_986_eus-gaap--FiniteLivedIntangibleAssetsNet_iS_pp0p0_c20210101__20210630__us-gaap--FairValueByAssetClassAxis__custom--IPRAndDMember_zjQ3JIkxxDj7" style="width: 14%; text-align: right" title="Intangible assets, beginning balance"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;13,366,234&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98E_eus-gaap--FiniteLivedIntangibleAssetsNet_iS_pp0p0_c20210101__20210630__us-gaap--FairValueByAssetClassAxis__us-gaap--GoodwillMember_zNBWiGj7paVi" style="width: 14%; text-align: right" title="Intangible assets, beginning balance"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;1,976,101&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98E_eus-gaap--FiniteLivedIntangibleAssetsNet_iS_pp0p0_c20210101__20210630__us-gaap--FiniteLivedIntangibleAssetsByMajorClassAxis__us-gaap--NoncompeteAgreementsMember_zdqB8nlRBX59" style="width: 14%; text-align: right" title="Intangible assets, beginning balance"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;113,660&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Amortization&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_986_eus-gaap--AmortizationOfIntangibleAssets_iN_pp0p0_di_c20210101__20210630__us-gaap--FairValueByAssetClassAxis__custom--IPRAndDMember_z7TzeeSXjI5a" style="border-bottom: Black 1.5pt solid; text-align: right" title="Amortization"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0944"&gt;-&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98D_eus-gaap--AmortizationOfIntangibleAssets_iN_pp0p0_di_c20210101__20210630__us-gaap--FairValueByAssetClassAxis__us-gaap--GoodwillMember_zjtx3T7G2Lgi" style="border-bottom: Black 1.5pt solid; text-align: right" title="Amortization"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0946"&gt;-&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_982_eus-gaap--AmortizationOfIntangibleAssets_iN_pp0p0_di_c20210101__20210630__us-gaap--FiniteLivedIntangibleAssetsByMajorClassAxis__us-gaap--NoncompeteAgreementsMember_zNQ4n0vGQP99" style="border-bottom: Black 1.5pt solid; text-align: right" title="Amortization"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;(113,660&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;)&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left; padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Balance at June 30,
    2021, net&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98A_eus-gaap--FiniteLivedIntangibleAssetsNet_iE_pp0p0_c20210101__20210630__us-gaap--FairValueByAssetClassAxis__custom--IPRAndDMember_zZEW29lairU1" style="border-bottom: Black 2.5pt double; text-align: right" title="Intangible assets, ending balance"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;13,366,234&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_983_eus-gaap--FiniteLivedIntangibleAssetsNet_iE_pp0p0_c20210101__20210630__us-gaap--FairValueByAssetClassAxis__us-gaap--GoodwillMember_z0nQAbP1KtYl" style="border-bottom: Black 2.5pt double; text-align: right" title="Intangible assets, ending balance"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;1,976,101&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98F_eus-gaap--FiniteLivedIntangibleAssetsNet_iE_pp0p0_c20210101__20210630__us-gaap--FiniteLivedIntangibleAssetsByMajorClassAxis__us-gaap--NoncompeteAgreementsMember_zr55ihcRj1a4" style="border-bottom: Black 2.5pt double; text-align: right" title="Intangible assets, ending balance"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0954"&gt;-&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;

</us-gaap:FiniteLivedAndIndefiniteLivedIntangibleAssetsAcquiredAsPartOfBusinessCombinationTableTextBlock>
    <us-gaap:FiniteLivedIntangibleAssetsNet
      contextRef="AsOf2020-12-31_custom_IPRAndDMember"
      decimals="0"
      unitRef="USD">13366234</us-gaap:FiniteLivedIntangibleAssetsNet>
    <us-gaap:FiniteLivedIntangibleAssetsNet
      contextRef="AsOf2020-12-31_us-gaap_GoodwillMember"
      decimals="0"
      unitRef="USD">1976101</us-gaap:FiniteLivedIntangibleAssetsNet>
    <us-gaap:FiniteLivedIntangibleAssetsNet
      contextRef="AsOf2020-12-31_us-gaap_NoncompeteAgreementsMember"
      decimals="0"
      unitRef="USD">113660</us-gaap:FiniteLivedIntangibleAssetsNet>
    <us-gaap:AmortizationOfIntangibleAssets
      contextRef="From2021-01-012021-06-30_us-gaap_NoncompeteAgreementsMember"
      decimals="0"
      unitRef="USD">113660</us-gaap:AmortizationOfIntangibleAssets>
    <us-gaap:FiniteLivedIntangibleAssetsNet
      contextRef="AsOf2021-06-30_custom_IPRAndDMember"
      decimals="0"
      unitRef="USD">13366234</us-gaap:FiniteLivedIntangibleAssetsNet>
    <us-gaap:FiniteLivedIntangibleAssetsNet
      contextRef="AsOf2021-06-30_us-gaap_GoodwillMember"
      decimals="0"
      unitRef="USD">1976101</us-gaap:FiniteLivedIntangibleAssetsNet>
    <us-gaap:AccountsPayableAndAccruedLiabilitiesDisclosureTextBlock contextRef="From2021-01-01to2021-06-30">&lt;p id="xdx_800_eus-gaap--AccountsPayableAndAccruedLiabilitiesDisclosureTextBlock_zhhv59cbBNC1" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Note
10. &lt;span id="xdx_82A_z0L6k1aaQbsc"&gt;Accrued Liabilities&lt;/span&gt;&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p id="xdx_89D_eus-gaap--ScheduleOfAccruedLiabilitiesTableTextBlock_zOGA1Tqnz419" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;Other
accrued liabilities at June 30, 2021 and December 31, 2020 include the following:&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;span id="xdx_8BB_zWfJZ5aHNoz4" style="display: none"&gt;Schedule
of Accrued Liabilities&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%"&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td style="text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" id="xdx_497_20210630_z2FDEw1SRoAa" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;June
    30, 2021&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" id="xdx_493_20201231_zBnTiuJAFtpg" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;December
    31, 2020&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td style="text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_401_eus-gaap--ContractualObligation_iI_pp0p0_maALCz6Sz_zfyfKVfsRMK4" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="width: 60%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Amounts due to contract research
    organizations and other contractual agreements&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 16%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;1,189,017&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 16%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;636,000&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40B_eus-gaap--EmployeeRelatedLiabilitiesCurrent_iI_pp0p0_maALCz6Sz_zDGQRpcFS3Gf" style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Accrued payroll and related benefits&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;1,016,610&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;1,736,271&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40F_eus-gaap--AccruedProfessionalFeesCurrent_iI_pp0p0_maALCz6Sz_zPrELNiZ4yrf" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Accrued professional fees&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;80,625&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;66,850&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40E_eus-gaap--InterestPayableCurrent_iI_pp0p0_maALCz6Sz_z3zsLNxSna9" style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Accrued interest&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;7,042&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0970"&gt;&#160;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;-&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40A_eus-gaap--OtherAccruedLiabilitiesCurrent_iI_pp0p0_maALCz6Sz_zpNKibQdMIa3" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Other&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1.5pt solid; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;19,411&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1.5pt solid; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;19,411&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40B_eus-gaap--AccruedLiabilitiesCurrent_iTI_pp0p0_mtALCz6Sz_zGuQO0aCjIf1" style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Total&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;2,312,705&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;2,458,532&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;

&lt;p id="xdx_8A7_zIUS3GKp6Zrf" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

</us-gaap:AccountsPayableAndAccruedLiabilitiesDisclosureTextBlock>
    <us-gaap:ScheduleOfAccruedLiabilitiesTableTextBlock contextRef="From2021-01-01to2021-06-30">&lt;p id="xdx_89D_eus-gaap--ScheduleOfAccruedLiabilitiesTableTextBlock_zOGA1Tqnz419" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;Other
accrued liabilities at June 30, 2021 and December 31, 2020 include the following:&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;span id="xdx_8BB_zWfJZ5aHNoz4" style="display: none"&gt;Schedule
of Accrued Liabilities&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%"&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td style="text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" id="xdx_497_20210630_z2FDEw1SRoAa" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;June
    30, 2021&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" id="xdx_493_20201231_zBnTiuJAFtpg" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;December
    31, 2020&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td style="text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_401_eus-gaap--ContractualObligation_iI_pp0p0_maALCz6Sz_zfyfKVfsRMK4" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="width: 60%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Amounts due to contract research
    organizations and other contractual agreements&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 16%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;1,189,017&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 16%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;636,000&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40B_eus-gaap--EmployeeRelatedLiabilitiesCurrent_iI_pp0p0_maALCz6Sz_zDGQRpcFS3Gf" style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Accrued payroll and related benefits&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;1,016,610&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;1,736,271&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40F_eus-gaap--AccruedProfessionalFeesCurrent_iI_pp0p0_maALCz6Sz_zPrELNiZ4yrf" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Accrued professional fees&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;80,625&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;66,850&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40E_eus-gaap--InterestPayableCurrent_iI_pp0p0_maALCz6Sz_z3zsLNxSna9" style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Accrued interest&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;7,042&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0970"&gt;&#160;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;-&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40A_eus-gaap--OtherAccruedLiabilitiesCurrent_iI_pp0p0_maALCz6Sz_zpNKibQdMIa3" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Other&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1.5pt solid; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;19,411&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1.5pt solid; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;19,411&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40B_eus-gaap--AccruedLiabilitiesCurrent_iTI_pp0p0_mtALCz6Sz_zGuQO0aCjIf1" style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Total&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;2,312,705&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;2,458,532&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;

</us-gaap:ScheduleOfAccruedLiabilitiesTableTextBlock>
    <us-gaap:ContractualObligation contextRef="AsOf2021-06-30" decimals="0" unitRef="USD">1189017</us-gaap:ContractualObligation>
    <us-gaap:ContractualObligation contextRef="AsOf2020-12-31" decimals="0" unitRef="USD">636000</us-gaap:ContractualObligation>
    <us-gaap:EmployeeRelatedLiabilitiesCurrent contextRef="AsOf2021-06-30" decimals="0" unitRef="USD">1016610</us-gaap:EmployeeRelatedLiabilitiesCurrent>
    <us-gaap:EmployeeRelatedLiabilitiesCurrent contextRef="AsOf2020-12-31" decimals="0" unitRef="USD">1736271</us-gaap:EmployeeRelatedLiabilitiesCurrent>
    <us-gaap:AccruedProfessionalFeesCurrent contextRef="AsOf2021-06-30" decimals="0" unitRef="USD">80625</us-gaap:AccruedProfessionalFeesCurrent>
    <us-gaap:AccruedProfessionalFeesCurrent contextRef="AsOf2020-12-31" decimals="0" unitRef="USD">66850</us-gaap:AccruedProfessionalFeesCurrent>
    <us-gaap:InterestPayableCurrent contextRef="AsOf2021-06-30" decimals="0" unitRef="USD">7042</us-gaap:InterestPayableCurrent>
    <us-gaap:OtherAccruedLiabilitiesCurrent contextRef="AsOf2021-06-30" decimals="0" unitRef="USD">19411</us-gaap:OtherAccruedLiabilitiesCurrent>
    <us-gaap:OtherAccruedLiabilitiesCurrent contextRef="AsOf2020-12-31" decimals="0" unitRef="USD">19411</us-gaap:OtherAccruedLiabilitiesCurrent>
    <us-gaap:AccruedLiabilitiesCurrent contextRef="AsOf2021-06-30" decimals="0" unitRef="USD">2312705</us-gaap:AccruedLiabilitiesCurrent>
    <us-gaap:AccruedLiabilitiesCurrent contextRef="AsOf2020-12-31" decimals="0" unitRef="USD">2458532</us-gaap:AccruedLiabilitiesCurrent>
    <us-gaap:DebtDisclosureTextBlock contextRef="From2021-01-01to2021-06-30">&lt;p id="xdx_804_eus-gaap--DebtDisclosureTextBlock_zDBsHBsTvYFi" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Note
11. &lt;span id="xdx_82D_ztfCNB3BF8f6"&gt;Notes&lt;/span&gt;&lt;/b&gt;&lt;/span&gt;&lt;b&gt; &lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;Payable&lt;/span&gt;&lt;/b&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;i&gt;The
SVB Loan Facility&lt;/i&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;On
June 18, 2021, the Company entered into a $&lt;span id="xdx_906_eus-gaap--LineOfCreditFacilityMaximumBorrowingCapacity_iI_pn6n6_c20210618__us-gaap--TypeOfArrangementAxis__custom--SVBLoanFacilityMember_zYrRHKx65IX7"&gt;10
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;million loan facility (the &#x201c;SVB Loan Facility&#x201d;)
with Silicon Valley Bank (&#x201c;SVB&#x201d;). Celsion immediately used $&lt;span id="xdx_90E_eus-gaap--ProceedsFromLinesOfCredit_pn6n6_c20210601__20210618__us-gaap--TypeOfArrangementAxis__custom--SVBLoanFacilityMember_zRkqre0767zc"&gt;6
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;million from the SVB Loan Facility to
retire all outstanding indebtedness with Horizon Technology Finance Corporation as further discussed below. Simultaneously with this
transaction, the Company used $&lt;span id="xdx_909_eus-gaap--RestrictedCash_iI_pn6n6_c20210618__us-gaap--TypeOfArrangementAxis__custom--SVBLoanFacilityMember_zs9sNYlNZnDk" title="Restricted cash"&gt;6.0&lt;/span&gt; million of other available funds to establish a restricted cash account which serves as security for
the SVB Loan Facility. The remaining $&lt;span id="xdx_900_eus-gaap--LineOfCreditFacilityRemainingBorrowingCapacity_iI_pn6n6_c20210618__us-gaap--TypeOfArrangementAxis__custom--SVBLoanFacilityMember_zXeMk2yvXKAe"&gt;4
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;million will be available to be drawn down up
to 12 months after closing and will be used for working capital and to fund the advancement of the Company&#x2019;s product pipeline,
including GEN-1 for the treatment of newly diagnosed advanced ovarian cancer, as well as other strategic initiatives intended to broaden
its product pipeline.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;




&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;The
SVB Loan Facility is in the form of money market secured indebtedness bearing interest at a calculated WSJ Prime-based variable rate
(currently &lt;span id="xdx_901_eus-gaap--DebtInstrumentInterestRateStatedPercentage_c20210618__us-gaap--TypeOfArrangementAxis__custom--SVBLoanFacilityMember_pdd"&gt;3.25%&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;).
A final payment equal to &lt;span id="xdx_907_ecustom--FinalPaymentPercentage_c20210618__us-gaap--TypeOfArrangementAxis__custom--SVBLoanFacilityMember_pdd"&gt;3%
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;of the total $&lt;span id="xdx_901_eus-gaap--LineOfCredit_iI_pn6n6_c20210618__us-gaap--TypeOfArrangementAxis__custom--SVBLoanFacilityMember_zDU3ysiKCWwa"&gt;10
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;million commitment amount is due upon maturity
or prepayment of the SVB Loan Facility. There was &lt;span id="xdx_902_eus-gaap--LineOfCreditFacilityCommitmentFeeAmount_pp0p0_do_c20210601__20210618__us-gaap--TypeOfArrangementAxis__custom--SVBLoanFacilityMember_z7RDcVIvd7nc"&gt;no
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;facility commitment fee and &lt;span id="xdx_908_eus-gaap--DebtConversionConvertedInstrumentWarrantsOrOptionsIssued1_do_c20210601__20210618__us-gaap--TypeOfArrangementAxis__custom--SVBLoanFacilityMember_zxKtZQl2MNTj"&gt;no
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;stock or warrants were issued to SVB. &lt;span id="xdx_903_eus-gaap--DebtInstrumentDescription_c20210601__20210618__us-gaap--TypeOfArrangementAxis__custom--SVBLoanFacilityMember"&gt;Payments
under the loan agreement are interest only for the first 24 months after loan closing, followed by a 24-month amortization period of
principal and interest through the scheduled maturity date.&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;In
connection with the SVB Loan Facility, the Company incurred financing fees and expenses totaling $&lt;span id="xdx_90D_eus-gaap--InterestAndDebtExpense_c20210601__20210618__us-gaap--TypeOfArrangementAxis__custom--SVBLoanFacilityMember_pp0p0"&gt;243,370
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;which is recorded and classified as debt discount
and are being amortized as interest expense using the effective interest method over the life of the loan. Also, in connection with the
SVB Loan Facility, the Company is required to pay an end-of-term fee equal to &lt;span id="xdx_90C_ecustom--EndOfTermChargePercentage_c20210601__20210618__us-gaap--TypeOfArrangementAxis__custom--SVBLoanFacilityMember_pdd"&gt;3.0%
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;of the original loan amount at time of maturity.
Therefore, these amounts totaling $&lt;span id="xdx_907_eus-gaap--AmortizationOfFinancingCosts_pp0p0_c20210601__20210618__us-gaap--TypeOfArrangementAxis__custom--SVBLoanFacilityMember_zfrGpoPgCuj4"&gt;300,000
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;were being amortized as interest expense using
the effective interest method over the life of the loan. During the three and six-month periods ended June 30, 2021, the Company incurred
$&lt;span id="xdx_90C_eus-gaap--InterestExpenseDebt_c20210101__20210630__us-gaap--TypeOfArrangementAxis__custom--SVBLoanFacilityMember_pp0p0"&gt;7,042
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;in interest expense and amortized $&lt;span id="xdx_906_eus-gaap--AmortizationOfFinancingCostsAndDiscounts_pp0p0_c20210101__20210630__us-gaap--TypeOfArrangementAxis__custom--SVBLoanFacilityMember_zCD8P5Rm7fWd"&gt;6,457
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;as interest expense for debt discounts and end-of-term
fee in connection with the SVB Financing Facility.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p id="xdx_89B_eus-gaap--ScheduleOfMaturitiesOfLongTermDebtTableTextBlock_zA0OrhEcHcg5" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;Following
is a schedule of future principal payments, net of unamortized debt discounts and amortized end-of-term fee, due on the SVB Loan
Facility:&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;span id="xdx_8B9_z1LBw1ybetAj" style="display: none"&gt;Schedule
of Future Principle Payments, Net of Unamortized Debt Discounts&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; margin-left: auto; border-collapse: collapse; width: 80%; margin-right: auto"&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" id="xdx_49B_20210630_zRN0y04DfbZ2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;As
    of June 30,&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_406_eus-gaap--LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths_iI_pp0p0_maDICAzd4S_zGpQzPb0URLc" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;2022&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0998"&gt;&#x2013;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_401_eus-gaap--LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo_iI_pp0p0_maDICAzd4S_z9GgFD7BPiOi" style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;2023&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl1000"&gt;&#x2013;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_408_eus-gaap--LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree_iI_pp0p0_maDICAzd4S_zpMClawZJ8k4" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="width: 80%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;2024&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 16%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;3,000,000&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_408_ecustom--LongTermDebtMaturitiesRepaymentsOfPrincipalYearFourAndThereAfter_iI_pp0p0_maDICAzd4S_z7o7oasIwqk7" style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;2025 and&lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;
    thereafter&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1.5pt solid; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;3,000,000&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_409_eus-gaap--DebtInstrumentCarryingAmount_iTI_pp0p0_mtDICAzd4S_maLTDzrgw_zqnRyTti7kw9" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Subtotal of future principal payments&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;6,000,000&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_400_eus-gaap--DeferredFinanceCostsNet_iNI_pp0p0_di_msLTDzrgw_zccsqLc8FVH" style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Unamortized debt premium,
    net&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1.5pt solid; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;(236,913&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;)&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_401_eus-gaap--LongTermDebt_iTI_pp0p0_mtLTDzrgw_zXoiqTV25pye" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="padding-left: 10pt; text-align: left; padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Total&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;5,763,087&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;

&lt;p id="xdx_8A9_zy9OfBhf7rOi" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;i&gt;Horizon
Credit Agreement&lt;/i&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;On
June 27, 2018, the Company entered into a loan agreement with Horizon Technology Finance Corporation (&#x201c;Horizon&#x201d;) that provided
$&lt;span id="xdx_903_eus-gaap--LineOfCreditFacilityMaximumBorrowingCapacity_iI_pn6n6_c20180627__us-gaap--TypeOfArrangementAxis__custom--InitialHorizonCreditAgreementMember_zkfQB5GOdQAc"&gt;10
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;million in new capital (the &#x201c;Horizon Credit
Agreement&#x201d;). The Company drew down $&lt;span id="xdx_904_eus-gaap--ProceedsFromLinesOfCredit_pn6n6_c20180626__20180627__us-gaap--TypeOfArrangementAxis__custom--InitialHorizonCreditAgreementMember_z966F2N1lnT6"&gt;10
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;million upon closing of the Horizon Credit Agreement
on June 27, 2018. On August 28, 2020, Horizon and the Company amended the Horizon Credit Agreement (the &#x201c;Amendment&#x201d;) whereby
Celsion repaid $&lt;span id="xdx_90E_eus-gaap--RepaymentsOfNotesPayable_pn6n6_c20200827__20200828__us-gaap--TypeOfArrangementAxis__custom--AmendmentToHorizonCreditAgreementMember__dei--LegalEntityAxis__custom--HorizonTechnologyFinanceCorporationMember_zuJUbukFi259"&gt;5
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;million of the $10 million loan and $&lt;span id="xdx_905_ecustom--PaymentOfDebtEndTermCharges_pn5n6_c20200827__20200828__us-gaap--TypeOfArrangementAxis__custom--AmendmentToHorizonCreditAgreementMember__dei--LegalEntityAxis__custom--HorizonTechnologyFinanceCorporationMember_z7jYmIYCWGV1"&gt;0.2
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;million in related end of term charges, and the
remaining $&lt;span id="xdx_90C_eus-gaap--LineOfCreditFacilityRemainingBorrowingCapacity_iI_pn6n6_c20180627__us-gaap--TypeOfArrangementAxis__custom--InitialHorizonCreditAgreementMember_zlsIXpBRHX2d"&gt;5
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;million in obligations were restructured as set
forth below.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;Pursuant
to the Amendment, the remaining $&lt;span id="xdx_908_eus-gaap--DebtInstrumentFaceAmount_iI_pn6n6_c20200828__us-gaap--TypeOfArrangementAxis__custom--AmendmentToHorizonCreditAgreementMember__dei--LegalEntityAxis__custom--HorizonTechnologyFinanceCorporationMember_zce3TW5sOzha"&gt;5
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;million in obligations of Celsion under the Horizon
Credit Agreement was secured by a first-priority security interest in substantially all assets of Celsion other than intellectual
property assets. &lt;span id="xdx_90A_eus-gaap--DebtInstrumentInterestRateTerms_c20200827__20200828__us-gaap--TypeOfArrangementAxis__custom--AmendmentToHorizonCreditAgreementMember__dei--LegalEntityAxis__custom--HorizonTechnologyFinanceCorporationMember_zH8QZJ3kIg7g"&gt;The
obligations bore interest at a rate calculated based an amount by which the one-month LIBOR exceeds 2% plus 7.625%. In no event
shall the interest rate be less than 9.625%. Payments pursuant to the Amendment were interest only for the first twelve (12) months
after August 1, 2020, followed by a 21-month amortization period of principal and interest through the scheduled maturity date on April
1, 2023. In addition, the remaining $5 million in obligations was subject to an end of term fee equal, in the aggregate, to $&lt;/span&gt;&lt;/span&gt;&lt;span id="xdx_902_eus-gaap--DebtInstrumentFeeAmount_c20200828__us-gaap--TypeOfArrangementAxis__custom--AmendmentToHorizonCreditAgreementMember__dei--LegalEntityAxis__custom--HorizonTechnologyFinanceCorporationMember_pp0p0" style="font: 10pt Times New Roman, Times, Serif"&gt;275,000&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;,
which amount was payable upon the maturity of the obligations or upon the date of final payment or default, as applicable. &lt;span id="xdx_90C_eus-gaap--DebtInstrumentRestrictiveCovenants_c20200827__20200828__us-gaap--TypeOfArrangementAxis__custom--AmendmentToHorizonCreditAgreementMember__dei--LegalEntityAxis__custom--HorizonTechnologyFinanceCorporationMember"&gt;In
connection with the Amendment, Celsion agreed to a liquidity covenant which provides that, at all times, Celsion shall maintain unrestricted
cash and/or cash equivalents on deposit in accounts over which the applicable Lenders maintain an account control agreement in an amount
not less than $2.5 million. In addition, pursuant to the Amendment, Celsion agreed to provide evidence to Horizon on or before March
31, 2021, that it received aggregate cash proceeds of not less than $5 million from the sale of equity, debt, its New Jersey net operating
losses, or a combination thereof, subsequent to the date of the Amendment.&lt;/span&gt;&lt;/span&gt; &lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;The
Company met this requirement during the fourth quarter of 2020.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;In
connection with the Horizon Credit Agreement, the Company incurred financing fees and expenses totaling $&lt;span id="xdx_90C_eus-gaap--InterestAndDebtExpense_c20180626__20180627__us-gaap--TypeOfArrangementAxis__custom--InitialHorizonCreditAgreementMember_pp0p0"&gt;175,000
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;which were recorded and classified as debt discount.
In addition, the Company paid loan origination fees of $&lt;span id="xdx_90F_eus-gaap--LoanProcessingFee_c20180626__20180627__us-gaap--TypeOfArrangementAxis__custom--InitialHorizonCreditAgreementMember_pp0p0"&gt;100,000
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;which were recorded and classified as debt discount.
These debt discount amounts totaling $&lt;span id="xdx_90D_eus-gaap--DebtInstrumentUnamortizedDiscount_c20180627__us-gaap--TypeOfArrangementAxis__custom--InitialHorizonCreditAgreementMember_pp0p0"&gt;782,116
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;were being amortized as interest expense using
the effective interest method over the life of the loan. Also, in connection with each of the Horizon Credit Agreement, the Company was
required to pay an end of term charge equal to &lt;span id="xdx_905_ecustom--EndOfTermChargePercentage_c20180626__20180627__us-gaap--TypeOfArrangementAxis__custom--InitialHorizonCreditAgreementMember_pdd"&gt;4.0%
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;of the original loan amount at time of maturity.
Therefore, those amounts totaling $&lt;span id="xdx_909_eus-gaap--DeferredFinanceCostsNet_c20180627__us-gaap--TypeOfArrangementAxis__custom--InitialHorizonCreditAgreementMember_pp0p0"&gt;400,000
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;were being amortized as interest expense using
the effective interest method over the life of the loan.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;




&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;As
a fee in connection with the Horizon Credit Agreement, Celsion issued Horizon warrants exercisable for a total of &lt;span id="xdx_904_eus-gaap--ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights_c20180627__us-gaap--TypeOfArrangementAxis__custom--InitialHorizonCreditAgreementMember__us-gaap--StatementEquityComponentsAxis__us-gaap--CommonStockMember_pdd"&gt;190,114
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;shares of Celsion&#x2019;s common stock (the &#x201c;Existing
Warrants&#x201d;) at a per share exercise price of $&lt;span id="xdx_907_eus-gaap--ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_c20180627__us-gaap--TypeOfArrangementAxis__custom--InitialHorizonCreditAgreementMember__us-gaap--StatementEquityComponentsAxis__us-gaap--CommonStockMember_pdd"&gt;2.63&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;.
The Horizon Warrants were immediately exercisable for cash or by net exercise from the date of grant and will expire after ten years
from the date of grant. The Company valued the Horizon Warrants issued using the Black-Scholes option pricing model and recorded a total
of $&lt;span id="xdx_90B_eus-gaap--FairValueAdjustmentOfWarrants_c20180626__20180627__us-gaap--TypeOfArrangementAxis__custom--InitialHorizonCreditAgreementMember_pp0p0"&gt;507,116
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;as a direct deduction from the debt liability,
consistent with the presentation of debt discounts, and are being amortized as interest expense using the effective interest method over
the life of the loan. Pursuant to the Amendment, one-half of the aggregate Existing Warrants, exercisable for a total of &lt;span id="xdx_903_ecustom--ClassOfWarrantOrRightWarrantsOrRightsCancelled_c20200828__us-gaap--TypeOfArrangementAxis__custom--AmendmentToHorizonCreditAgreementMember__dei--LegalEntityAxis__custom--HorizonTechnologyFinanceCorporationMember__us-gaap--StatementEquityComponentsAxis__us-gaap--CommonStockMember_pdd"&gt;95,057
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;shares of Celsion&#x2019;s common stock, have
been canceled, and, in connection with the Amendment, Celsion issued Horizon new warrants exercisable at a per share exercise price equal
to $&lt;span id="xdx_906_eus-gaap--ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_c20200828__us-gaap--TypeOfArrangementAxis__custom--AmendmentToHorizonCreditAgreementMember__dei--LegalEntityAxis__custom--HorizonTechnologyFinanceCorporationMember__us-gaap--StatementEquityComponentsAxis__us-gaap--CommonStockMember_pdd"&gt;1.01
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;for a total of &lt;span id="xdx_904_eus-gaap--ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights_c20200828__us-gaap--TypeOfArrangementAxis__custom--AmendmentToHorizonCreditAgreementMember__dei--LegalEntityAxis__custom--HorizonTechnologyFinanceCorporationMember__us-gaap--StatementEquityComponentsAxis__us-gaap--CommonStockMember_pdd"&gt;247,525
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;shares of Celsion&#x2019;s common stock (the &#x201c;New
Warrants&#x201d; and, together with the Existing Warrants, the &#x201c;Warrants&#x201d;). The remaining &lt;span id="xdx_904_eus-gaap--ClassOfWarrantOrRightOutstanding_c20180627__us-gaap--TypeOfArrangementAxis__custom--InitialHorizonCreditAgreementMember__us-gaap--StatementEquityComponentsAxis__us-gaap--CommonStockMember_pdd"&gt;95,057
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;Existing Warrants issued in connection with the
Horizon Credit Agreement remain outstanding at a per share exercise price of $2.63.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;The
New Warrants were immediately exercisable for cash or by net exercise from the date of grant and will expire after ten years from
the date of grant. Effective October 27, 2020. The Horizon Credit Agreement contains customary representations, warranties and affirmative
and negative covenants including, among other things, covenants that limit or restrict Celsion&#x2019;s ability to grant liens, incur
indebtedness, make certain restricted payments, merge, or consolidate and make dispositions of assets.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;The
Amendment was evaluated in accordance with FASB ASC 470-50, &lt;i&gt;Debt-Modifications and Extinguishments&lt;/i&gt;, for debt modification and
extinguishment accounting. We accounted for the $&lt;span id="xdx_904_eus-gaap--PaymentsOfDebtExtinguishmentCosts_pn6n6_c20200827__20200828__us-gaap--TypeOfArrangementAxis__custom--AmendmentToHorizonCreditAgreementMember__dei--LegalEntityAxis__custom--HorizonTechnologyFinanceCorporationMember_zAUWcpet6Cdl"&gt;5
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;million we repaid as a debt extinguishment thereby
reducing the principal obligations accordingly. Also, in connection with the $5 million repayment, we recognized as interest expense,
approximately $&lt;span id="xdx_909_eus-gaap--DebtInstrumentUnamortizedDiscount_iI_pn5n6_c20200828__us-gaap--TypeOfArrangementAxis__custom--AmendmentToHorizonCreditAgreementMember__dei--LegalEntityAxis__custom--HorizonTechnologyFinanceCorporationMember_zUp1qgaGEWKk"&gt;0.2
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;million of unamortized debt discount, deferred
financing and end of term fees related to the repaid obligation in August 2020.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;We
accounted for the remaining $5 million of obligation under the Amendment as a debt modification to the initial agreement with respect
to the minor changes in cash flows. Also, in connection with the $5 million remaining obligations, we recorded $&lt;span id="xdx_905_eus-gaap--DeferredFinanceCostsNet_c20200828__us-gaap--TypeOfArrangementAxis__custom--AmendmentToHorizonCreditAgreementMember__dei--LegalEntityAxis__custom--HorizonTechnologyFinanceCorporationMember_pp0p0"&gt;5,000
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;of financing fees and the New Warrant fair value
of $&lt;span id="xdx_90B_eus-gaap--WarrantsNotSettleableInCashFairValueDisclosure_c20200828__us-gaap--TypeOfArrangementAxis__custom--AmendmentToHorizonCreditAgreementMember__dei--LegalEntityAxis__custom--HorizonTechnologyFinanceCorporationMember_pp0p0"&gt;247,548
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;as additional debt discount on the $5 million
remaining obligation. Therefore, approximately $&lt;span id="xdx_902_eus-gaap--DebtInstrumentUnamortizedDiscount_c20210630__us-gaap--TypeOfArrangementAxis__custom--AmendmentToHorizonCreditAgreementMember__dei--LegalEntityAxis__custom--HorizonTechnologyFinanceCorporationMember_pp0p0"&gt;109,706
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;of unamortized debt discount will be amortized
over the remaining life of the new obligations. The $&lt;span id="xdx_903_ecustom--EndOfTermFees_c20180626__20180627__us-gaap--TypeOfArrangementAxis__custom--InitialHorizonCreditAgreementMember_pp0p0"&gt;275,000
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;of end of term fees, net of previously amortized
end of term fees totaling $&lt;span id="xdx_908_eus-gaap--DebtInstrumentFeeAmount_c20180627__us-gaap--TypeOfArrangementAxis__custom--InitialHorizonCreditAgreementMember_pp0p0"&gt;142,605
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;previously accrued on the original note associated
with the $5 million remaining obligation, will be amortized as interest expense over the remaining life of the new obligations.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;During
the three and six-month periods ended June 30, 2021, the Company incurred $&lt;span id="xdx_905_eus-gaap--InterestExpenseDebt_pp0p0_c20210401__20210630__us-gaap--DebtInstrumentAxis__custom--InitialHorizonCreditAgreementAmendmentMember_zz3mrabrYijj"&gt;105,607
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;and $&lt;span id="xdx_906_eus-gaap--InterestExpenseDebt_pp0p0_c20210101__20210630__us-gaap--DebtInstrumentAxis__custom--InitialHorizonCreditAgreementAmendmentMember_zoXmKKqJxf3"&gt;225,920&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;,
respectively, in interest expense and amortized $&lt;span id="xdx_908_eus-gaap--AmortizationOfFinancingCosts_pp0p0_c20210401__20210630__us-gaap--DebtInstrumentAxis__custom--InitialHorizonCreditAgreementAmendmentMember_zx6z5ZvsQLYf"&gt;102,126
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;and $&lt;span id="xdx_906_eus-gaap--AmortizationOfFinancingCosts_c20210101__20210630__us-gaap--DebtInstrumentAxis__custom--InitialHorizonCreditAgreementAmendmentMember_pp0p0"&gt;139,428
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;as interest expense for debt discounts and end
of term charges in connection with the Horizon Credit Agreement. During the three and six-month periods ended June 30, 2020, the Company
incurred $&lt;span id="xdx_907_eus-gaap--InterestExpenseDebt_pp0p0_c20200401__20200630__us-gaap--DebtInstrumentAxis__custom--InitialHorizonCreditAgreementAmendmentMember_z8a6wbHwmch1"&gt;243,299
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;and $&lt;span id="xdx_90C_eus-gaap--InterestExpenseDebt_c20200101__20200630__us-gaap--DebtInstrumentAxis__custom--InitialHorizonCreditAgreementAmendmentMember_pp0p0"&gt;486,597&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;,
respectively, in interest expense and amortized $&lt;span id="xdx_906_eus-gaap--AmortizationOfFinancingCosts_pp0p0_c20200401__20200630__us-gaap--DebtInstrumentAxis__custom--InitialHorizonCreditAgreementAmendmentMember_zXVN04mODJ1i"&gt;96,727
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;and $&lt;span id="xdx_904_eus-gaap--AmortizationOfFinancingCosts_c20200101__20200630__us-gaap--DebtInstrumentAxis__custom--InitialHorizonCreditAgreementAmendmentMember_pp0p0"&gt;192,793&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;,
respectfully, as interest expense for debt discounts and end of term charges in connection with the Horizon Credit Agreement.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p id="xdx_899_eus-gaap--ScheduleOfDebtTableTextBlock_zxTOtvYAFLbl" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;On
June 18, 2021, as a condition of entering into the SVB Loan Facility, the Company paid the outstanding principal balance,
an early termination fee and the end of term charges in full satisfaction of the Horizon Credit Agreement, as amended.
Following is a schedule of the amounts paid to Horizon on June 18, 2021.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;span id="xdx_8BB_zkVw8gEY8R8b" style="display: none"&gt;Schedule
of Debt&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; margin-left: auto; border-collapse: collapse; width: 80%; margin-right: auto"&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="width: 80%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Principal balance at June 18, 2021&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98A_eus-gaap--LineOfCredit_iS_pp0p0_c20210619__20210630__dei--LegalEntityAxis__custom--HorizonTechnologyFinanceCorporationMember_zAmYhkUZFuhk" style="width: 16%; text-align: right" title="Line of credit, beginning balance"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;5,000,000&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Early termination fees&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_985_ecustom--EarlyTerminationFees_c20210619__20210630__dei--LegalEntityAxis__custom--HorizonTechnologyFinanceCorporationMember_zgVnQaVJ4SS5" style="text-align: right" title="Early termination fees"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;150,000&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="text-align: left; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;End of term charges&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98D_ecustom--EndOfTermFees_pp0p0_c20210619__20210630__dei--LegalEntityAxis__custom--HorizonTechnologyFinanceCorporationMember_zMGjpuyzQG2i" style="border-bottom: Black 1.5pt solid; text-align: right" title="End of term charges"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;275,000&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="padding-left: 10pt; padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Total&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_986_eus-gaap--LineOfCredit_iE_pp0p0_c20210619__20210630__dei--LegalEntityAxis__custom--HorizonTechnologyFinanceCorporationMember_zD1y3El5W0k4" style="border-bottom: Black 2.5pt double; text-align: right" title="Line of credit, ending balance"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;5,425,000&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;

&lt;p id="xdx_8AC_zWYHsRZk7bzd" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;During
the three and six months ended June 30, 2021, the Company recorded a loss of $&lt;span id="xdx_907_eus-gaap--GainLossOnContractTermination_c20210101__20210630__us-gaap--TypeOfArrangementAxis__custom--HorizonCreditAgreementMember_pp0p0"&gt;234,419
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;on the termination of the Horizon Credit Agreement,
as amended, which represented the early termination fee and the end of term fees, net of previously amortized interest expense totaling
$&lt;span id="xdx_90A_eus-gaap--InterestExpenseDebt_c20210101__20210630__us-gaap--TypeOfArrangementAxis__custom--HorizonCreditAgreementMember_pp0p0"&gt;190,581
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;on the date of its payoff.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

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    <us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity
      contextRef="AsOf2021-06-18_custom_SVBLoanFacilityMember"
      decimals="-6"
      unitRef="USD">10000000</us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity>
    <us-gaap:ProceedsFromLinesOfCredit
      contextRef="From2021-06-012021-06-18_custom_SVBLoanFacilityMember"
      decimals="-6"
      unitRef="USD">6000000</us-gaap:ProceedsFromLinesOfCredit>
    <us-gaap:RestrictedCash
      contextRef="AsOf2021-06-18_custom_SVBLoanFacilityMember"
      decimals="-6"
      unitRef="USD">6000000.0</us-gaap:RestrictedCash>
    <us-gaap:LineOfCreditFacilityRemainingBorrowingCapacity
      contextRef="AsOf2021-06-18_custom_SVBLoanFacilityMember"
      decimals="-6"
      unitRef="USD">4000000</us-gaap:LineOfCreditFacilityRemainingBorrowingCapacity>
    <us-gaap:DebtInstrumentInterestRateStatedPercentage
      contextRef="AsOf2021-06-18_custom_SVBLoanFacilityMember"
      decimals="INF"
      unitRef="Percentage">0.0325</us-gaap:DebtInstrumentInterestRateStatedPercentage>
    <CLSN:FinalPaymentPercentage
      contextRef="AsOf2021-06-18_custom_SVBLoanFacilityMember"
      decimals="INF"
      unitRef="Percentage">0.03</CLSN:FinalPaymentPercentage>
    <us-gaap:LineOfCredit
      contextRef="AsOf2021-06-18_custom_SVBLoanFacilityMember"
      decimals="-6"
      unitRef="USD">10000000</us-gaap:LineOfCredit>
    <us-gaap:LineOfCreditFacilityCommitmentFeeAmount
      contextRef="From2021-06-012021-06-18_custom_SVBLoanFacilityMember"
      decimals="0"
      unitRef="USD">0</us-gaap:LineOfCreditFacilityCommitmentFeeAmount>
    <us-gaap:DebtConversionConvertedInstrumentWarrantsOrOptionsIssued1
      contextRef="From2021-06-012021-06-18_custom_SVBLoanFacilityMember"
      decimals="INF"
      unitRef="Shares">0</us-gaap:DebtConversionConvertedInstrumentWarrantsOrOptionsIssued1>
    <us-gaap:DebtInstrumentDescription contextRef="From2021-06-012021-06-18_custom_SVBLoanFacilityMember">Payments
under the loan agreement are interest only for the first 24 months after loan closing, followed by a 24-month amortization period of
principal and interest through the scheduled maturity date.</us-gaap:DebtInstrumentDescription>
    <us-gaap:InterestAndDebtExpense
      contextRef="From2021-06-012021-06-18_custom_SVBLoanFacilityMember"
      decimals="0"
      unitRef="USD">243370</us-gaap:InterestAndDebtExpense>
    <CLSN:EndOfTermChargePercentage
      contextRef="From2021-06-012021-06-18_custom_SVBLoanFacilityMember"
      decimals="INF"
      unitRef="Percentage">0.030</CLSN:EndOfTermChargePercentage>
    <us-gaap:AmortizationOfFinancingCosts
      contextRef="From2021-06-012021-06-18_custom_SVBLoanFacilityMember"
      decimals="0"
      unitRef="USD">300000</us-gaap:AmortizationOfFinancingCosts>
    <us-gaap:InterestExpenseDebt
      contextRef="From2021-01-012021-06-30_custom_SVBLoanFacilityMember"
      decimals="0"
      unitRef="USD">7042</us-gaap:InterestExpenseDebt>
    <us-gaap:AmortizationOfFinancingCostsAndDiscounts
      contextRef="From2021-01-012021-06-30_custom_SVBLoanFacilityMember"
      decimals="0"
      unitRef="USD">6457</us-gaap:AmortizationOfFinancingCostsAndDiscounts>
    <us-gaap:ScheduleOfMaturitiesOfLongTermDebtTableTextBlock contextRef="From2021-01-01to2021-06-30">&lt;p id="xdx_89B_eus-gaap--ScheduleOfMaturitiesOfLongTermDebtTableTextBlock_zA0OrhEcHcg5" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;Following
is a schedule of future principal payments, net of unamortized debt discounts and amortized end-of-term fee, due on the SVB Loan
Facility:&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;span id="xdx_8B9_z1LBw1ybetAj" style="display: none"&gt;Schedule
of Future Principle Payments, Net of Unamortized Debt Discounts&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; margin-left: auto; border-collapse: collapse; width: 80%; margin-right: auto"&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" id="xdx_49B_20210630_zRN0y04DfbZ2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;As
    of June 30,&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_406_eus-gaap--LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths_iI_pp0p0_maDICAzd4S_zGpQzPb0URLc" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;2022&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl0998"&gt;&#x2013;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_401_eus-gaap--LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo_iI_pp0p0_maDICAzd4S_z9GgFD7BPiOi" style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;2023&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl1000"&gt;&#x2013;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_408_eus-gaap--LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree_iI_pp0p0_maDICAzd4S_zpMClawZJ8k4" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="width: 80%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;2024&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 16%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;3,000,000&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_408_ecustom--LongTermDebtMaturitiesRepaymentsOfPrincipalYearFourAndThereAfter_iI_pp0p0_maDICAzd4S_z7o7oasIwqk7" style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;2025 and&lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;
    thereafter&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1.5pt solid; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;3,000,000&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_409_eus-gaap--DebtInstrumentCarryingAmount_iTI_pp0p0_mtDICAzd4S_maLTDzrgw_zqnRyTti7kw9" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Subtotal of future principal payments&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;6,000,000&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_400_eus-gaap--DeferredFinanceCostsNet_iNI_pp0p0_di_msLTDzrgw_zccsqLc8FVH" style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Unamortized debt premium,
    net&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1.5pt solid; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;(236,913&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;)&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_401_eus-gaap--LongTermDebt_iTI_pp0p0_mtLTDzrgw_zXoiqTV25pye" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="padding-left: 10pt; text-align: left; padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Total&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;5,763,087&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;

</us-gaap:ScheduleOfMaturitiesOfLongTermDebtTableTextBlock>
    <us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree contextRef="AsOf2021-06-30" decimals="0" unitRef="USD">3000000</us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree>
    <CLSN:LongTermDebtMaturitiesRepaymentsOfPrincipalYearFourAndThereAfter contextRef="AsOf2021-06-30" decimals="0" unitRef="USD">3000000</CLSN:LongTermDebtMaturitiesRepaymentsOfPrincipalYearFourAndThereAfter>
    <us-gaap:DebtInstrumentCarryingAmount contextRef="AsOf2021-06-30" decimals="0" unitRef="USD">6000000</us-gaap:DebtInstrumentCarryingAmount>
    <us-gaap:DeferredFinanceCostsNet contextRef="AsOf2021-06-30" decimals="0" unitRef="USD">236913</us-gaap:DeferredFinanceCostsNet>
    <us-gaap:LongTermDebt contextRef="AsOf2021-06-30" decimals="0" unitRef="USD">5763087</us-gaap:LongTermDebt>
    <us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity
      contextRef="AsOf2018-06-27_custom_InitialHorizonCreditAgreementMember"
      decimals="-6"
      unitRef="USD">10000000</us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity>
    <us-gaap:ProceedsFromLinesOfCredit
      contextRef="From2018-06-262018-06-27_custom_InitialHorizonCreditAgreementMember"
      decimals="-6"
      unitRef="USD">10000000</us-gaap:ProceedsFromLinesOfCredit>
    <us-gaap:RepaymentsOfNotesPayable
      contextRef="From2020-08-272020-08-28_custom_AmendmentToHorizonCreditAgreementMember_custom_HorizonTechnologyFinanceCorporationMember"
      decimals="-6"
      unitRef="USD">5000000</us-gaap:RepaymentsOfNotesPayable>
    <CLSN:PaymentOfDebtEndTermCharges
      contextRef="From2020-08-272020-08-28_custom_AmendmentToHorizonCreditAgreementMember_custom_HorizonTechnologyFinanceCorporationMember"
      decimals="-5"
      unitRef="USD">200000</CLSN:PaymentOfDebtEndTermCharges>
    <us-gaap:LineOfCreditFacilityRemainingBorrowingCapacity
      contextRef="AsOf2018-06-27_custom_InitialHorizonCreditAgreementMember"
      decimals="-6"
      unitRef="USD">5000000</us-gaap:LineOfCreditFacilityRemainingBorrowingCapacity>
    <us-gaap:DebtInstrumentFaceAmount
      contextRef="AsOf2020-08-28_custom_AmendmentToHorizonCreditAgreementMember_custom_HorizonTechnologyFinanceCorporationMember"
      decimals="-6"
      unitRef="USD">5000000</us-gaap:DebtInstrumentFaceAmount>
    <us-gaap:DebtInstrumentInterestRateTerms contextRef="From2020-08-272020-08-28_custom_AmendmentToHorizonCreditAgreementMember_custom_HorizonTechnologyFinanceCorporationMember">The
obligations bore interest at a rate calculated based an amount by which the one-month LIBOR exceeds 2% plus 7.625%. In no event
shall the interest rate be less than 9.625%. Payments pursuant to the Amendment were interest only for the first twelve (12) months
after August 1, 2020, followed by a 21-month amortization period of principal and interest through the scheduled maturity date on April
1, 2023. In addition, the remaining $5 million in obligations was subject to an end of term fee equal, in the aggregate, to $</us-gaap:DebtInstrumentInterestRateTerms>
    <us-gaap:DebtInstrumentFeeAmount
      contextRef="AsOf2020-08-28_custom_AmendmentToHorizonCreditAgreementMember_custom_HorizonTechnologyFinanceCorporationMember"
      decimals="0"
      unitRef="USD">275000</us-gaap:DebtInstrumentFeeAmount>
    <us-gaap:DebtInstrumentRestrictiveCovenants contextRef="From2020-08-272020-08-28_custom_AmendmentToHorizonCreditAgreementMember_custom_HorizonTechnologyFinanceCorporationMember">In
connection with the Amendment, Celsion agreed to a liquidity covenant which provides that, at all times, Celsion shall maintain unrestricted
cash and/or cash equivalents on deposit in accounts over which the applicable Lenders maintain an account control agreement in an amount
not less than $2.5 million. In addition, pursuant to the Amendment, Celsion agreed to provide evidence to Horizon on or before March
31, 2021, that it received aggregate cash proceeds of not less than $5 million from the sale of equity, debt, its New Jersey net operating
losses, or a combination thereof, subsequent to the date of the Amendment.</us-gaap:DebtInstrumentRestrictiveCovenants>
    <us-gaap:InterestAndDebtExpense
      contextRef="From2018-06-262018-06-27_custom_InitialHorizonCreditAgreementMember"
      decimals="0"
      unitRef="USD">175000</us-gaap:InterestAndDebtExpense>
    <us-gaap:LoanProcessingFee
      contextRef="From2018-06-262018-06-27_custom_InitialHorizonCreditAgreementMember"
      decimals="0"
      unitRef="USD">100000</us-gaap:LoanProcessingFee>
    <us-gaap:DebtInstrumentUnamortizedDiscount
      contextRef="AsOf2018-06-27_custom_InitialHorizonCreditAgreementMember"
      decimals="0"
      unitRef="USD">782116</us-gaap:DebtInstrumentUnamortizedDiscount>
    <CLSN:EndOfTermChargePercentage
      contextRef="From2018-06-262018-06-27_custom_InitialHorizonCreditAgreementMember"
      decimals="INF"
      unitRef="Percentage">0.040</CLSN:EndOfTermChargePercentage>
    <us-gaap:DeferredFinanceCostsNet
      contextRef="AsOf2018-06-27_custom_InitialHorizonCreditAgreementMember"
      decimals="0"
      unitRef="USD">400000</us-gaap:DeferredFinanceCostsNet>
    <us-gaap:ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
      contextRef="AsOf2018-06-27_custom_InitialHorizonCreditAgreementMember_us-gaap_CommonStockMember"
      decimals="INF"
      unitRef="Shares">190114</us-gaap:ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights>
    <us-gaap:ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
      contextRef="AsOf2018-06-27_custom_InitialHorizonCreditAgreementMember_us-gaap_CommonStockMember"
      decimals="INF"
      unitRef="USDPShares">2.63</us-gaap:ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1>
    <us-gaap:FairValueAdjustmentOfWarrants
      contextRef="From2018-06-262018-06-27_custom_InitialHorizonCreditAgreementMember"
      decimals="0"
      unitRef="USD">507116</us-gaap:FairValueAdjustmentOfWarrants>
    <CLSN:ClassOfWarrantOrRightWarrantsOrRightsCancelled
      contextRef="AsOf2020-08-28_custom_AmendmentToHorizonCreditAgreementMember_custom_HorizonTechnologyFinanceCorporationMember_us-gaap_CommonStockMember"
      decimals="INF"
      unitRef="Shares">95057</CLSN:ClassOfWarrantOrRightWarrantsOrRightsCancelled>
    <us-gaap:ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
      contextRef="AsOf2020-08-28_custom_AmendmentToHorizonCreditAgreementMember_custom_HorizonTechnologyFinanceCorporationMember_us-gaap_CommonStockMember"
      decimals="INF"
      unitRef="USDPShares">1.01</us-gaap:ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1>
    <us-gaap:ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
      contextRef="AsOf2020-08-28_custom_AmendmentToHorizonCreditAgreementMember_custom_HorizonTechnologyFinanceCorporationMember_us-gaap_CommonStockMember"
      decimals="INF"
      unitRef="Shares">247525</us-gaap:ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights>
    <us-gaap:ClassOfWarrantOrRightOutstanding
      contextRef="AsOf2018-06-27_custom_InitialHorizonCreditAgreementMember_us-gaap_CommonStockMember"
      decimals="INF"
      unitRef="Shares">95057</us-gaap:ClassOfWarrantOrRightOutstanding>
    <us-gaap:PaymentsOfDebtExtinguishmentCosts
      contextRef="From2020-08-272020-08-28_custom_AmendmentToHorizonCreditAgreementMember_custom_HorizonTechnologyFinanceCorporationMember"
      decimals="-6"
      unitRef="USD">5000000</us-gaap:PaymentsOfDebtExtinguishmentCosts>
    <us-gaap:DebtInstrumentUnamortizedDiscount
      contextRef="AsOf2020-08-28_custom_AmendmentToHorizonCreditAgreementMember_custom_HorizonTechnologyFinanceCorporationMember"
      decimals="-5"
      unitRef="USD">200000</us-gaap:DebtInstrumentUnamortizedDiscount>
    <us-gaap:DeferredFinanceCostsNet
      contextRef="AsOf2020-08-28_custom_AmendmentToHorizonCreditAgreementMember_custom_HorizonTechnologyFinanceCorporationMember"
      decimals="0"
      unitRef="USD">5000</us-gaap:DeferredFinanceCostsNet>
    <us-gaap:WarrantsNotSettleableInCashFairValueDisclosure
      contextRef="AsOf2020-08-28_custom_AmendmentToHorizonCreditAgreementMember_custom_HorizonTechnologyFinanceCorporationMember"
      decimals="0"
      unitRef="USD">247548</us-gaap:WarrantsNotSettleableInCashFairValueDisclosure>
    <us-gaap:DebtInstrumentUnamortizedDiscount
      contextRef="AsOf2021-06-30_custom_AmendmentToHorizonCreditAgreementMember_custom_HorizonTechnologyFinanceCorporationMember"
      decimals="0"
      unitRef="USD">109706</us-gaap:DebtInstrumentUnamortizedDiscount>
    <CLSN:EndOfTermFees
      contextRef="From2018-06-262018-06-27_custom_InitialHorizonCreditAgreementMember"
      decimals="0"
      unitRef="USD">275000</CLSN:EndOfTermFees>
    <us-gaap:DebtInstrumentFeeAmount
      contextRef="AsOf2018-06-27_custom_InitialHorizonCreditAgreementMember"
      decimals="0"
      unitRef="USD">142605</us-gaap:DebtInstrumentFeeAmount>
    <us-gaap:InterestExpenseDebt
      contextRef="From2021-04-012021-06-30_custom_InitialHorizonCreditAgreementAmendmentMember"
      decimals="0"
      unitRef="USD">105607</us-gaap:InterestExpenseDebt>
    <us-gaap:InterestExpenseDebt
      contextRef="From2021-01-012021-06-30_custom_InitialHorizonCreditAgreementAmendmentMember"
      decimals="0"
      unitRef="USD">225920</us-gaap:InterestExpenseDebt>
    <us-gaap:AmortizationOfFinancingCosts
      contextRef="From2021-04-012021-06-30_custom_InitialHorizonCreditAgreementAmendmentMember"
      decimals="0"
      unitRef="USD">102126</us-gaap:AmortizationOfFinancingCosts>
    <us-gaap:AmortizationOfFinancingCosts
      contextRef="From2021-01-012021-06-30_custom_InitialHorizonCreditAgreementAmendmentMember"
      decimals="0"
      unitRef="USD">139428</us-gaap:AmortizationOfFinancingCosts>
    <us-gaap:InterestExpenseDebt
      contextRef="From2020-04-012020-06-30_custom_InitialHorizonCreditAgreementAmendmentMember"
      decimals="0"
      unitRef="USD">243299</us-gaap:InterestExpenseDebt>
    <us-gaap:InterestExpenseDebt
      contextRef="From2020-01-012020-06-30_custom_InitialHorizonCreditAgreementAmendmentMember"
      decimals="0"
      unitRef="USD">486597</us-gaap:InterestExpenseDebt>
    <us-gaap:AmortizationOfFinancingCosts
      contextRef="From2020-04-012020-06-30_custom_InitialHorizonCreditAgreementAmendmentMember"
      decimals="0"
      unitRef="USD">96727</us-gaap:AmortizationOfFinancingCosts>
    <us-gaap:AmortizationOfFinancingCosts
      contextRef="From2020-01-012020-06-30_custom_InitialHorizonCreditAgreementAmendmentMember"
      decimals="0"
      unitRef="USD">192793</us-gaap:AmortizationOfFinancingCosts>
    <us-gaap:ScheduleOfDebtTableTextBlock contextRef="From2021-01-01to2021-06-30">&lt;p id="xdx_899_eus-gaap--ScheduleOfDebtTableTextBlock_zxTOtvYAFLbl" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;On
June 18, 2021, as a condition of entering into the SVB Loan Facility, the Company paid the outstanding principal balance,
an early termination fee and the end of term charges in full satisfaction of the Horizon Credit Agreement, as amended.
Following is a schedule of the amounts paid to Horizon on June 18, 2021.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;span id="xdx_8BB_zkVw8gEY8R8b" style="display: none"&gt;Schedule
of Debt&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; margin-left: auto; border-collapse: collapse; width: 80%; margin-right: auto"&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="width: 80%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Principal balance at June 18, 2021&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98A_eus-gaap--LineOfCredit_iS_pp0p0_c20210619__20210630__dei--LegalEntityAxis__custom--HorizonTechnologyFinanceCorporationMember_zAmYhkUZFuhk" style="width: 16%; text-align: right" title="Line of credit, beginning balance"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;5,000,000&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Early termination fees&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_985_ecustom--EarlyTerminationFees_c20210619__20210630__dei--LegalEntityAxis__custom--HorizonTechnologyFinanceCorporationMember_zgVnQaVJ4SS5" style="text-align: right" title="Early termination fees"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;150,000&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="text-align: left; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;End of term charges&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98D_ecustom--EndOfTermFees_pp0p0_c20210619__20210630__dei--LegalEntityAxis__custom--HorizonTechnologyFinanceCorporationMember_zMGjpuyzQG2i" style="border-bottom: Black 1.5pt solid; text-align: right" title="End of term charges"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;275,000&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="padding-left: 10pt; padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Total&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_986_eus-gaap--LineOfCredit_iE_pp0p0_c20210619__20210630__dei--LegalEntityAxis__custom--HorizonTechnologyFinanceCorporationMember_zD1y3El5W0k4" style="border-bottom: Black 2.5pt double; text-align: right" title="Line of credit, ending balance"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;5,425,000&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;

</us-gaap:ScheduleOfDebtTableTextBlock>
    <us-gaap:LineOfCredit
      contextRef="AsOf2021-06-18_custom_HorizonTechnologyFinanceCorporationMember"
      decimals="0"
      unitRef="USD">5000000</us-gaap:LineOfCredit>
    <CLSN:EarlyTerminationFees
      contextRef="From2021-06-192021-06-30_custom_HorizonTechnologyFinanceCorporationMember"
      decimals="0"
      unitRef="USD">150000</CLSN:EarlyTerminationFees>
    <CLSN:EndOfTermFees
      contextRef="From2021-06-192021-06-30_custom_HorizonTechnologyFinanceCorporationMember"
      decimals="0"
      unitRef="USD">275000</CLSN:EndOfTermFees>
    <us-gaap:LineOfCredit
      contextRef="AsOf2021-06-30_custom_HorizonTechnologyFinanceCorporationMember"
      decimals="0"
      unitRef="USD">5425000</us-gaap:LineOfCredit>
    <us-gaap:GainLossOnContractTermination
      contextRef="From2021-01-012021-06-30_custom_HorizonCreditAgreementMember"
      decimals="0"
      unitRef="USD">234419</us-gaap:GainLossOnContractTermination>
    <us-gaap:InterestExpenseDebt
      contextRef="From2021-01-012021-06-30_custom_HorizonCreditAgreementMember"
      decimals="0"
      unitRef="USD">190581</us-gaap:InterestExpenseDebt>
    <us-gaap:StockholdersEquityNoteDisclosureTextBlock contextRef="From2021-01-01to2021-06-30">&lt;p id="xdx_80B_eus-gaap--StockholdersEquityNoteDisclosureTextBlock_z4i556ELqwRh" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Note
12. &lt;span id="xdx_827_zwrisun1hGC8"&gt;Stockholders&#x2019; Equity&lt;/span&gt;&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;In
September 2018, the Company filed with the SEC a $&lt;span id="xdx_90F_ecustom--ShelfRegistrationStatementAmount_pn6n6_c20180901__20180930_z6kOyeRMUEy6"&gt;75
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;million shelf registration statement on Form
S-3 (the 2018 Shelf Registration Statement) that allows the Company to issue any combination of common stock, preferred stock or warrants
to purchase common stock or preferred stock. This shelf registration was declared effective on October 12, 2018, and was
fully utilized by the end of January 2021.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;




&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;On
March 19, 2021, the Company filed with the SEC a new $&lt;span id="xdx_907_ecustom--ShelfRegistrationStatementAmount_pn6n6_c20210318__20210319_zBrO5S5vboV8"&gt;100
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;million shelf registration statement on Form
S-3 (the &#x201c;2021 Registration Statement&#x201d;) that allows the Company to issue any combination of common stock, preferred stock
or warrants to purchase common stock or preferred stock. This shelf registration was declared effective on March 30, 2021.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;i&gt;&lt;span style="text-decoration: underline"&gt;Capital
on Demand&lt;sup&gt;TM&lt;/sup&gt; Sales Agreement&lt;/span&gt;&lt;/i&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;On
December 4, 2018, the Company entered into the Capital on Demand Agreement with JonesTrading, pursuant to which the Company may offer
and sell, from time to time, through JonesTrading shares of Common Stock having an aggregate offering price of up to $&lt;span id="xdx_905_ecustom--AggregateOfferingPrices_pn5n6_c20181202__20181204__us-gaap--TypeOfArrangementAxis__custom--CapitalOnDemandTMSalesAgreementMember_zjxEhECp5K63"&gt;16.0
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;million.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;During
2020 through June 30, 2020, the Company sold and issued an aggregate of &lt;span id="xdx_906_eus-gaap--StockIssuedDuringPeriodSharesNewIssues_pn5n6_c20200101__20200630__us-gaap--TypeOfArrangementAxis__custom--CapitalOnDemandAgreementMember_zSm2pkR5U73i"&gt;1.2
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;million shares under the Capital on Demand
Agreement, receiving approximately $&lt;span id="xdx_900_eus-gaap--ProceedsFromIssuanceOfCommonStock_pn5n6_c20200101__20200630__us-gaap--TypeOfArrangementAxis__custom--CapitalOnDemandAgreementMember_zCADWbcV9O0h"&gt;3.5
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;million in gross proceeds. During the first
half of 2021, the Company sold &lt;span id="xdx_906_eus-gaap--StockIssuedDuringPeriodSharesNewIssues_pn5n6_c20210101__20210331__us-gaap--TypeOfArrangementAxis__custom--CapitalOnDemandAgreementMember_zHPWaFmPEmU"&gt;7.2
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;million shares under the Capital on Demand Agreement,
receiving approximately $&lt;span id="xdx_905_eus-gaap--ProceedsFromIssuanceOfCommonStock_pn5n6_c20210101__20210331__us-gaap--TypeOfArrangementAxis__custom--CapitalOnDemandAgreementMember_zXHcc671V5Pg"&gt;6.9
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;million in gross proceeds under the Capital on
Demand Agreement.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;i&gt;&lt;span style="text-decoration: underline"&gt;Registered
Direct Offering&lt;/span&gt;&lt;/i&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;On
February 27, 2020, we entered into a Securities Purchase Agreement (the &#x201c;February 2020 Purchase Agreement&#x201d;) with several
institutional investors, pursuant to which we agreed to issue and sell, in a registered direct offering (the &#x201c;February 2020
Offering&#x201d;), an aggregate of &lt;span id="xdx_90F_eus-gaap--StockIssuedDuringPeriodSharesNewIssues_pid_c20200226__20200227__us-gaap--TypeOfArrangementAxis__custom--SecuritiesPurchaseAgreementMember_zUAhIVI0k3lb"&gt;4,571,428 &lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;shares
of our common stock at an offering price of $&lt;span id="xdx_90A_eus-gaap--SharesIssuedPricePerShare_iI_pid_c20200227__us-gaap--TypeOfArrangementAxis__custom--SecuritiesPurchaseAgreementMember_zQxwlSRowZd2"&gt;1.05 &lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;per
Share for gross proceeds of approximately $&lt;span id="xdx_905_eus-gaap--ProceedsFromIssuanceOfCommonStock_pn5n6_c20200226__20200227__us-gaap--TypeOfArrangementAxis__custom--SecuritiesPurchaseAgreementMember_zoT3KNK5lUu5"&gt;4.8 &lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;million
before the deduction of the Placement Agent fees and offering expenses. In a concurrent private placement (the &#x201c;Private
Placement&#x201d;), the Company issued to the investors that participated in the February 2020 Offering, for no additional
consideration, warrants to purchase up to &lt;span id="xdx_90C_eus-gaap--ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight_c20200227__us-gaap--TypeOfArrangementAxis__custom--SecuritiesPurchaseAgreementMember__us-gaap--StatementEquityComponentsAxis__custom--OriginalWarrantsMember_pdd"&gt;2,971,428 &lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;shares
of common stock (the &#x201c;Original Warrants&#x201d;). The Original Warrants were initially exercisable six months following their
date of issue and were set to expire on the &lt;span id="xdx_903_eus-gaap--WarrantsAndRightsOutstandingTerm_iI_dxL_c20200227__us-gaap--TypeOfArrangementAxis__custom--SecuritiesPurchaseAgreementMember__us-gaap--StatementEquityComponentsAxis__custom--OriginalWarrantsMember_zLhLDfQ92Fj" title="::XDX::P5Y"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl1072"&gt;five-year&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;
anniversary of such initial exercise date. The Original Warrants had an exercise price of $&lt;span id="xdx_907_eus-gaap--ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_iI_pid_c20200227__us-gaap--TypeOfArrangementAxis__custom--SecuritiesPurchaseAgreementMember__us-gaap--StatementEquityComponentsAxis__custom--OriginalWarrantsMember_zzQ0oUkx6I1e"&gt;1.15 &lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;per
share subject to adjustment as provided therein. On March 12, 2020, the Company entered into private exchange agreements (the
&#x201c;Exchange Agreements&#x201d;) with holders of the Original Warrants. Pursuant to the Exchange Agreements, in return for a
higher exercise price of $&lt;span id="xdx_90D_eus-gaap--ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_iI_pid_c20200312__us-gaap--TypeOfArrangementAxis__custom--ExchangeAgreementsMember__us-gaap--StatementEquityComponentsAxis__us-gaap--WarrantMember_zmBGdzB62lid"&gt;1.24 &lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;per
share of common stock, the Company issued new warrants to the Investors to purchase up to &lt;span id="xdx_904_eus-gaap--ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight_iI_pid_c20200312__us-gaap--TypeOfArrangementAxis__custom--ExchangeAgreementsMember__us-gaap--StatementEquityComponentsAxis__us-gaap--WarrantMember_zDxruSt2GUpl"&gt;3,200,000 &lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;shares
of common stock (the &#x201c;Exchange Warrants&#x201d;) in exchange for the Original Warrants. The Exchange Warrants, like the
Original Warrants, are initially exercisable six months following their issuance (the &#x201c;Initial Exercise Date&#x201d;) and
expire on the &lt;span id="xdx_90A_eus-gaap--WarrantsAndRightsOutstandingTerm_iI_dxL_c20200312__us-gaap--TypeOfArrangementAxis__custom--ExchangeAgreementsMember__us-gaap--StatementEquityComponentsAxis__us-gaap--WarrantMember_zvInSFBdHo4c" title="::XDX::P5Y"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl1076"&gt;five-year&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;
anniversary of their Initial Exercise Date. Other than having a higher exercise price, different issue date, Initial Exercise Date
and expiration date, the terms of the Exchange Warrants are identical to those of the Original Warrants. On July 31, 2020, the
Company filed a Form S-3 Registration Statement to register the shares of common stock issuable under the Exchange Warrants; the
Registration Statement was declared effective by the SEC on August 13, 2020. No Exchange Warrants were exercised during 2020. During
2021 through the date of this Quarterly Report on Form 10-Q, the Company issued &lt;span id="xdx_90D_eus-gaap--ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight_iI_pn5n6_c20210630__us-gaap--TypeOfArrangementAxis__custom--ExchangeAgreementsMember_zfIt5TJCsBY6"&gt;1.2 &lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;million
shares pursuant to investors exercising Exchange Warrants, receiving approximately $&lt;span id="xdx_90C_eus-gaap--ProceedsFromIssuanceOfWarrants_pn5n6_c20210101__20210630__us-gaap--TypeOfArrangementAxis__custom--ExchangeAgreementsMember_zTmpheC7YDWj"&gt;1.5 &lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;million in
net proceeds.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;i&gt;&lt;span style="text-decoration: underline"&gt;Underwritten
Offering&lt;/span&gt;&lt;/i&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;On
June 22, 2020, the Company entered into an underwriting agreement (the &#x201c;Underwriting Agreement&#x201d;) with Oppenheimer &amp;amp; Co.
Inc. (the &#x201c;Underwriter&#x201d;), relating to the issuance and sale (the &#x201c;Underwritten Offering&#x201d;) of &lt;span id="xdx_90A_eus-gaap--StockIssuedDuringPeriodSharesNewIssues_c20200621__20200622__us-gaap--TypeOfArrangementAxis__custom--UnderwritingAgreementMember__us-gaap--SubsidiarySaleOfStockAxis__custom--UnderwrittenOfferingMember_zuYZrzK0hDlb"&gt;2,666,667
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;shares of the Company&#x2019;s common stock. Pursuant
to the terms of the Underwriting Agreement, the Underwriter agreed to purchase the shares at a price of $&lt;span id="xdx_903_eus-gaap--SharePrice_c20200622__us-gaap--TypeOfArrangementAxis__custom--UnderwritingAgreementMember__us-gaap--SubsidiarySaleOfStockAxis__custom--UnderwrittenOfferingMember_pdd"&gt;3.4875
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;per share. The Underwriter offered the shares
at a public offering price of $&lt;span id="xdx_907_eus-gaap--SharesIssuedPricePerShare_c20200622__us-gaap--TypeOfArrangementAxis__custom--UnderwritingAgreementMember__us-gaap--SubsidiarySaleOfStockAxis__custom--UnderwrittenOfferingMember_pdd"&gt;3.75
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;per share, reflecting an underwriting discount
equal to $&lt;span id="xdx_909_ecustom--UnderwritingDiscountPricePerShare_c20200621__20200622__us-gaap--TypeOfArrangementAxis__custom--UnderwritingAgreementMember__us-gaap--SubsidiarySaleOfStockAxis__custom--UnderwrittenOfferingMember_pdd"&gt;0.2625&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;,
or &lt;span id="xdx_90E_ecustom--PercentageOfUnderwritingDiscountOnPublicOfferingPrice_c20200621__20200622__us-gaap--TypeOfArrangementAxis__custom--UnderwritingAgreementMember__us-gaap--SubsidiarySaleOfStockAxis__custom--UnderwrittenOfferingMember_pdd"&gt;7.0%
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;of the public offering price. The net proceeds
to the Company from the Underwritten Offering, after deducting the underwriting discount and estimated offering expenses payable by the
Company, were approximately $&lt;span id="xdx_900_eus-gaap--ProceedsFromIssuanceOfCommonStock_pn5n6_c20200621__20200622__us-gaap--TypeOfArrangementAxis__custom--UnderwritingAgreementMember__us-gaap--SubsidiarySaleOfStockAxis__custom--UnderwrittenOfferingMember_zQIpLXo9Qdhi"&gt;9.1
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;million.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;Pursuant
to the Underwriting Agreement, until December 31, 2020, the Underwriter had a right of first refusal to act as sole underwriter, initial
purchaser, placement/selling agent, or arranger, as the case may be, on any new financing for the Company (excluding equipment lease
financings, loans or grants from governmental authorities or in connection with government programs and financings relating to or sales
of tax attributes) during such period. The Underwriter common stock the sole right to determine whether or not any other broker dealer
shall have the right to participate in any such offering and the economic terms of any such participation.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;i&gt;&lt;span style="text-decoration: underline"&gt;January
2021 Registered Direct Offering&lt;/span&gt;&lt;/i&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;On
January 22, 2021, the Company entered into a Securities Purchase Agreement (the &#x201c;January 2021 Purchase Agreement&#x201d;) with several
institutional investors, pursuant to which the Company agreed to issue and sell, in a registered direct offering (the &#x201c;January
2021 Offering&#x201d;), an aggregate of &lt;span id="xdx_900_eus-gaap--StockIssuedDuringPeriodSharesNewIssues_pid_c20210121__20210122__us-gaap--TypeOfArrangementAxis__custom--UnderwritingAgreementMember__us-gaap--SubsidiarySaleOfStockAxis__custom--JanuaryRegisteredDirectOfferingMember_zasU5swSYTMh"&gt;25,925,925
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;shares of the Company&#x2019;s common stock at
an offering price of $&lt;span id="xdx_904_eus-gaap--SharePrice_iI_pid_c20210122__us-gaap--TypeOfArrangementAxis__custom--UnderwritingAgreementMember__us-gaap--SubsidiarySaleOfStockAxis__custom--JanuaryRegisteredDirectOfferingMember_zr11OwB61xAk"&gt;1.35
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;per share for gross proceeds of approximately
$&lt;span id="xdx_907_eus-gaap--ProceedsFromIssuanceOfCommonStock_pn6n6_c20210121__20210122__us-gaap--TypeOfArrangementAxis__custom--UnderwritingAgreementMember__us-gaap--SubsidiarySaleOfStockAxis__custom--JanuaryRegisteredDirectOfferingMember_zd15X3MYAhDf"&gt;35
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;million before the deduction of the January 2021
Placement Agents (as defined below) fee and offering expenses. The January 2021 Purchase Agreement contains customary representations,
warranties and agreements by the Company and customary conditions to closing. The closing of the January 2021 Offering occurred on January
26, 2021.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;




&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span id="xdx_907_ecustom--PlacementAgentFeeDescription_c20210121__20210122__us-gaap--TypeOfArrangementAxis__custom--UnderwritingAgreementMember__us-gaap--SubsidiarySaleOfStockAxis__custom--JanuaryRegisteredDirectOfferingMember" style="font: 10pt Times New Roman, Times, Serif"&gt;In
connection with the January 2021 Offering, the Company entered into a placement agent agreement (the &#x201c;January 2021 Placement Agent
Agreement&#x201d;) with A.G.P./Alliance Global Partners (together with Brookline Capital Markets, the &#x201c;January 2021 Placement Agents&#x201d;)
pursuant to which the Company agreed to pay the January 2021 Placement Agents a cash fee equal to 7% of the aggregate gross proceeds
raised from the sale of the securities sold in the January 2021 Offering and reimburse the January 2021 Placement Agents for certain
of their expenses in an amount not to exceed $82,500.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;i&gt;&lt;span style="text-decoration: underline"&gt;March
2021 Registered Direct Offering&lt;/span&gt;&lt;/i&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;On
March 31, 2021, the Company entered into a Securities Purchase Agreement (the &#x201c;March 2021 Purchase Agreement&#x201d;) with several
institutional investors, pursuant to which the Company agreed to issue and sell, in a registered direct offering (the &#x201c;March 2021
Offering&#x201d;), an aggregate of &lt;span id="xdx_90F_eus-gaap--StockIssuedDuringPeriodSharesNewIssues_pid_c20210301__20210331__us-gaap--TypeOfArrangementAxis__custom--UnderwritingAgreementMember__us-gaap--SubsidiarySaleOfStockAxis__custom--MarchRegisteredDirectOfferingMember_zdtgwFzakQy9"&gt;11,538,462
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;shares of the Company&#x2019;s common stock, at
an offering price of $&lt;span id="xdx_904_eus-gaap--SharePrice_iI_pid_c20210331__us-gaap--TypeOfArrangementAxis__custom--UnderwritingAgreementMember__us-gaap--SubsidiarySaleOfStockAxis__custom--MarchRegisteredDirectOfferingMember_z7sC1OPpVPib"&gt;1.30
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;per share for gross proceeds of approximately
$&lt;span id="xdx_90B_eus-gaap--ProceedsFromIssuanceOfCommonStock_pn6n6_c20210301__20210331__us-gaap--TypeOfArrangementAxis__custom--UnderwritingAgreementMember__us-gaap--SubsidiarySaleOfStockAxis__custom--MarchRegisteredDirectOfferingMember_zXxKK5h5EZul"&gt;15
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;million before the deduction of the placement
agents fee and offering expenses. The shares were offered by the Company pursuant to the 2021 Registration Statement. The closing of
the Offering occurred on April 5, 2021.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span id="xdx_908_ecustom--PlacementAgentFeeDescription_c20210301__20210331__us-gaap--TypeOfArrangementAxis__custom--UnderwritingAgreementMember__us-gaap--SubsidiarySaleOfStockAxis__custom--MarchRegisteredDirectOfferingMember_zNVsqgMVK1J7" style="font: 10pt Times New Roman, Times, Serif"&gt;In
connection with the March 2021 Offering, the Company entered into a placement agent agreement (the &#x201c;March 2021 Placement Agent
Agreement&#x201d;) with A.G.P./Alliance Global Partners, as lead placement agent (&#x201c;AGP,&#x201d; and together with JonesTrading Institutional
Services LLC and Brookline Capital Markets, a division of Arcadia Securities, LLC, serving as co-placement agents, the &#x201c;March 2021
Placement Agents&#x201d;) pursuant to which the Company agreed to pay the March 2021 Placement Agents an aggregate cash fee equal to 7%
of the aggregate gross proceeds raised from the sale of the securities sold in the Offering and reimburse the Placement Agents for certain
of their expenses in an amount not to exceed $82,500.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;Under
the March 2021 Purchase Agreement and March 2021 Placement Agent Agreement, the Company and its subsidiaries are prohibited, for a period
of 90 days after the closing, from entering into any agreement to issue or announcing any issuance or proposed issuance of common stock
or any other securities that are at any time convertible into, or exercisable or exchangeable for, or otherwise entitle the holder thereof
to receive common stock without the prior written consent of AGP or the investors participating in the offering. For purposes of this
offering, AGP and the investors from the Company&#x2019;s January 2021 Offering waived a similar 90-day restriction in the placement agent
agreement and purchase agreement for that transaction.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;i&gt;&lt;span style="text-decoration: underline"&gt;LPC
Purchase Agreement&lt;/span&gt;&lt;/i&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;On
September 8, 2020, the Company entered into a purchase agreement (the &#x201c;LPC Purchase Agreement&#x201d;) and a Registration Rights
Agreement (the &#x201c;Registration Rights Agreement&#x201d;) with Lincoln Park Capital Fund, LLC (&#x201c;Lincoln Park&#x201d;), pursuant
to which, upon the terms and subject to the conditions and limitations set forth therein, the Company has the right to sell to Lincoln
Park up to $&lt;span id="xdx_905_eus-gaap--StockIssuedDuringPeriodSharesNewIssues_pn5n6_c20200907__20200908__us-gaap--TypeOfArrangementAxis__custom--LPCPurchaseAgreementMember__dei--LegalEntityAxis__custom--LincolnParkCapitalFundLLCMember_zjznHtlrf8kh"&gt;26.0
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;million of shares of the Company&#x2019;s common
stock at the Company&#x2019;s discretion as described below (the &#x201c;LPC Offering&#x201d;). During 2020, the Company sold and issued
an aggregate of &lt;span id="xdx_90C_eus-gaap--StockIssuedDuringPeriodSharesNewIssues_pn5n6_c20200101__20201231__us-gaap--TypeOfArrangementAxis__custom--LPCPurchaseAgreementMember__dei--LegalEntityAxis__custom--LincolnParkCapitalFundLLCMember_z85zqYLDSQCd"&gt;3.3
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;million shares, including the &lt;span id="xdx_905_eus-gaap--StockIssuedDuringPeriodSharesNewIssues_c20200907__20200908__us-gaap--TypeOfArrangementAxis__custom--LPCPurchaseAgreementMember__dei--LegalEntityAxis__custom--LincolnParkCapitalFundLLCMember__us-gaap--StatementEquityComponentsAxis__custom--LPCCommitmentSharesMember_pdd"&gt;437,828
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;commitment shares, under the LPC Purchase Agreement,
receiving approximately $&lt;span id="xdx_90F_eus-gaap--ProceedsFromIssuanceOfCommonStock_pn5n6_c20200101__20201231__us-gaap--TypeOfArrangementAxis__custom--LPCPurchaseAgreementMember__dei--LegalEntityAxis__custom--LincolnParkCapitalFundLLCMember_ztWQLGUmWN6"&gt;2.2
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;million in gross proceeds. On January
21, 2021, the Company terminated the LPC Purchase Agreement. The Company did not sell any shares under the LPC Purchase Agreement
in 2021.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

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    <CLSN:ShelfRegistrationStatementAmount
      contextRef="From2021-03-182021-03-19"
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      unitRef="USD">100000000</CLSN:ShelfRegistrationStatementAmount>
    <CLSN:AggregateOfferingPrices
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      unitRef="USD">16000000.0</CLSN:AggregateOfferingPrices>
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      contextRef="From2020-01-012020-06-30_custom_CapitalOnDemandAgreementMember"
      decimals="-5"
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    <us-gaap:ProceedsFromIssuanceOfCommonStock
      contextRef="From2020-01-012020-06-30_custom_CapitalOnDemandAgreementMember"
      decimals="-5"
      unitRef="USD">3500000</us-gaap:ProceedsFromIssuanceOfCommonStock>
    <us-gaap:StockIssuedDuringPeriodSharesNewIssues
      contextRef="From2021-01-012021-03-31_custom_CapitalOnDemandAgreementMember"
      decimals="-5"
      unitRef="Shares">7200000</us-gaap:StockIssuedDuringPeriodSharesNewIssues>
    <us-gaap:ProceedsFromIssuanceOfCommonStock
      contextRef="From2021-01-012021-03-31_custom_CapitalOnDemandAgreementMember"
      decimals="-5"
      unitRef="USD">6900000</us-gaap:ProceedsFromIssuanceOfCommonStock>
    <us-gaap:StockIssuedDuringPeriodSharesNewIssues
      contextRef="From2020-02-262020-02-27_custom_SecuritiesPurchaseAgreementMember"
      decimals="INF"
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    <us-gaap:SharesIssuedPricePerShare
      contextRef="AsOf2020-02-27_custom_SecuritiesPurchaseAgreementMember"
      decimals="INF"
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      contextRef="From2020-02-262020-02-27_custom_SecuritiesPurchaseAgreementMember"
      decimals="-5"
      unitRef="USD">4800000</us-gaap:ProceedsFromIssuanceOfCommonStock>
    <us-gaap:ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight
      contextRef="AsOf2020-02-27_custom_SecuritiesPurchaseAgreementMember_custom_OriginalWarrantsMember"
      decimals="INF"
      unitRef="Shares">2971428</us-gaap:ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight>
    <us-gaap:ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
      contextRef="AsOf2020-02-27_custom_SecuritiesPurchaseAgreementMember_custom_OriginalWarrantsMember"
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      contextRef="AsOf2020-03-12_custom_ExchangeAgreementsMember_us-gaap_WarrantMember"
      decimals="INF"
      unitRef="USDPShares">1.24</us-gaap:ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1>
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      contextRef="AsOf2020-03-12_custom_ExchangeAgreementsMember_us-gaap_WarrantMember"
      decimals="INF"
      unitRef="Shares">3200000</us-gaap:ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight>
    <us-gaap:ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight
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      decimals="-5"
      unitRef="USD">1500000</us-gaap:ProceedsFromIssuanceOfWarrants>
    <us-gaap:StockIssuedDuringPeriodSharesNewIssues
      contextRef="From2020-06-212020-06-22_custom_UnderwritingAgreementMember_custom_UnderwrittenOfferingMember"
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    <us-gaap:SharePrice
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    <us-gaap:StockIssuedDuringPeriodSharesNewIssues
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    <CLSN:PlacementAgentFeeDescription contextRef="From2021-01-212021-01-22_custom_UnderwritingAgreementMember_custom_JanuaryRegisteredDirectOfferingMember">In
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Agreement&#x201d;) with A.G.P./Alliance Global Partners (together with Brookline Capital Markets, the &#x201c;January 2021 Placement Agents&#x201d;)
pursuant to which the Company agreed to pay the January 2021 Placement Agents a cash fee equal to 7% of the aggregate gross proceeds
raised from the sale of the securities sold in the January 2021 Offering and reimburse the January 2021 Placement Agents for certain
of their expenses in an amount not to exceed $82,500.</CLSN:PlacementAgentFeeDescription>
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    <CLSN:PlacementAgentFeeDescription contextRef="From2021-03-012021-03-31_custom_UnderwritingAgreementMember_custom_MarchRegisteredDirectOfferingMember">In
connection with the March 2021 Offering, the Company entered into a placement agent agreement (the &#x201c;March 2021 Placement Agent
Agreement&#x201d;) with A.G.P./Alliance Global Partners, as lead placement agent (&#x201c;AGP,&#x201d; and together with JonesTrading Institutional
Services LLC and Brookline Capital Markets, a division of Arcadia Securities, LLC, serving as co-placement agents, the &#x201c;March 2021
Placement Agents&#x201d;) pursuant to which the Company agreed to pay the March 2021 Placement Agents an aggregate cash fee equal to 7%
of the aggregate gross proceeds raised from the sale of the securities sold in the Offering and reimburse the Placement Agents for certain
of their expenses in an amount not to exceed $82,500.</CLSN:PlacementAgentFeeDescription>
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      contextRef="From2020-09-072020-09-08_custom_LPCPurchaseAgreementMember_custom_LincolnParkCapitalFundLLCMember_custom_LPCCommitmentSharesMember"
      decimals="INF"
      unitRef="Shares">437828</us-gaap:StockIssuedDuringPeriodSharesNewIssues>
    <us-gaap:ProceedsFromIssuanceOfCommonStock
      contextRef="From2020-01-012020-12-31_custom_LPCPurchaseAgreementMember_custom_LincolnParkCapitalFundLLCMember"
      decimals="-5"
      unitRef="USD">2200000</us-gaap:ProceedsFromIssuanceOfCommonStock>
    <us-gaap:DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock contextRef="From2021-01-01to2021-06-30">&lt;p id="xdx_80A_eus-gaap--DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_zlOPbZ1JNyq4" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Note
13. &lt;span id="xdx_827_z8STTSt0mLsi"&gt;Stock-Based Compensation&lt;/span&gt;&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;The
Company has long-term compensation plans that permit the granting of equity-based awards in the form of stock options, restricted stock,
restricted stock units, stock appreciation rights, other stock awards, and performance awards.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;At
the 2018 Annual Stockholders Meeting of the Company held on May 15, 2018, stockholders approved the Celsion Corporation 2018 Stock Incentive
Plan (the &#x201c;2018 Plan&#x201d;). The 2018 Plan, as adopted, permits the granting of &lt;span id="xdx_900_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_c20210630__us-gaap--PlanNameAxis__custom--TwoThousandAndEighteenStockIncentivePlanMember_pdd"&gt;2,700,000
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;shares of Celsion common stock as equity awards
in the form of incentive stock options, nonqualified stock options, restricted stock, restricted stock units, stock appreciation rights,
other stock awards, performance awards, or in any combination of the foregoing. At the 2019 Annual Stockholders Meeting of the Company
held on May 14, 2019, stockholders approved an amendment to the 2018 Plan whereby the Company increased the number of common stock shares
available by &lt;span id="xdx_906_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_iI_c20190514__us-gaap--PlanNameAxis__custom--TwoThousandAndEighteenStockIncentivePlanMember__srt--RangeAxis__srt--MinimumMember_zLqi5XRg0ysh"&gt;1,200,000
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;to a total of &lt;span id="xdx_90E_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_iI_c20190514__us-gaap--PlanNameAxis__custom--TwoThousandAndEighteenStockIncentivePlanMember__srt--RangeAxis__srt--MaximumMember_z1yrVQy1CBnh"&gt;3,900,000
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;under the 2018 Plan, as amended. Prior to the
adoption of the 2018 Plan, the Company had maintained the Celsion Corporation 2007 Stock Incentive Plan (the &#x201c;2007 Plan&#x201d;).
At the 2020 Annual Stockholders Meeting of the Company held on June 15, 2020, stockholders approved an amendment to the 2018 Plan, as
previously amended, whereby the Company increased the number of shares of common stock available by &lt;span id="xdx_90D_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_c20200615__us-gaap--PlanNameAxis__custom--TwoThousandAndEighteenStockIncentivePlanMember__srt--RangeAxis__srt--MinimumMember_pdd"&gt;2,500,000
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;to a total of &lt;span id="xdx_90F_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_c20200615__us-gaap--PlanNameAxis__custom--TwoThousandAndEighteenStockIncentivePlanMember__srt--RangeAxis__srt--MaximumMember_pdd"&gt;6,400,000
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;under the 2018 Plan, as amended. At the 2021
Annual Stockholders Meeting of the Company held on June 10, 2020, stockholders approved an amendment to the 2018 Plan, as previously
amended, whereby the Company increased the number of shares of common stock available by &lt;span id="xdx_902_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_iI_c20210610__us-gaap--PlanNameAxis__custom--TwoThousandAndEighteenStockIncentivePlanMember__srt--RangeAxis__srt--MinimumMember_zkv7ydFVwj2"&gt;7,700,000
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;to a total of &lt;span id="xdx_90F_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_iI_c20210610__us-gaap--PlanNameAxis__custom--TwoThousandAndEighteenStockIncentivePlanMember__srt--RangeAxis__srt--MaximumMember_z0Zgx5xDVRQ6"&gt;14,100,000
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;under the 2018 Plan, as amended.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;The
Company has issued stock awards to employees and directors in the form of stock options and restricted stock. &lt;span id="xdx_901_ecustom--StockOptionsStrikePriceDescription_c20210101__20210630__us-gaap--PlanNameAxis__custom--TwoThousandSevenStockIncentivePlanMember"&gt;Options
are generally granted with strike prices equal to the fair market value of a share of Celsion common stock on the date of grant. Incentive
stock options may be granted to purchase shares of common stock at a price not less than 100% of the fair market value of the underlying
shares on the date of grant, provided that the exercise price of any incentive stock option granted to an eligible employee owning more
than 10% of the outstanding stock of Celsion must be at least 110% of such fair market value on the date of grant. Only officers and
key employees may receive incentive stock options.&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;




&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;Option
and restricted stock awards vest upon terms determined by the Compensation Committee of the Board of Directors and are subject to accelerated
vesting in the event of a change of control or certain terminations of employment. The Company issues new shares to satisfy its obligations
from the exercise of options or the grant of restricted stock awards.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;On
September 28, 2018, and again on February 19, 2019, the Compensation Committee of the Board of Directors approved the grant of (i)
inducement stock options (the &#x201c;Inducement Option Grants&#x201d;) to purchase a total of &lt;span id="xdx_90C_eus-gaap--SharesIssued_c20180928__us-gaap--PlanNameAxis__custom--InducementOptionGrantsMember__srt--TitleOfIndividualAxis__custom--FiveNewEmployeesMember__us-gaap--StatementEquityComponentsAxis__us-gaap--CommonStockMember_pdd"&gt;164,004 &lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;and &lt;span id="xdx_907_eus-gaap--SharesIssued_c20190219__us-gaap--PlanNameAxis__custom--InducementOptionGrantsMember__srt--TitleOfIndividualAxis__custom--FiveNewEmployeesMember__us-gaap--StatementEquityComponentsAxis__us-gaap--CommonStockMember_pdd"&gt;140,004 &lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;shares
of Celsion common stock, respectively and (ii) inducement restricted stock awards (the &#x201c;Inducement Stock Grants&#x201d;)
totaling &lt;span id="xdx_90D_eus-gaap--SharesIssued_c20180928__us-gaap--PlanNameAxis__custom--InducementOptionGrantsMember__srt--TitleOfIndividualAxis__custom--FiveNewEmployeesMember__us-gaap--AwardTypeAxis__us-gaap--RestrictedStockMember_pdd"&gt;19,000 &lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;and &lt;span id="xdx_906_eus-gaap--SharesIssued_c20190219__us-gaap--PlanNameAxis__custom--InducementOptionGrantsMember__srt--TitleOfIndividualAxis__custom--FiveNewEmployeesMember__us-gaap--AwardTypeAxis__us-gaap--RestrictedStockMember_pdd"&gt;13,000 &lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;shares
of Celsion common stock to five new employees collectively. Each award has a grant date of the date of grant. Each Inducement Option
Grant has an exercise price per share equal to $&lt;span id="xdx_908_eus-gaap--ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_c20180927__20180928__us-gaap--PlanNameAxis__custom--InducementOptionGrantsMember__srt--TitleOfIndividualAxis__custom--FiveNewEmployeesMember_pdd"&gt;2.77 &lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;and
$&lt;span id="xdx_907_eus-gaap--ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_c20190218__20190219__us-gaap--PlanNameAxis__custom--InducementOptionGrantsMember__srt--TitleOfIndividualAxis__custom--FiveNewEmployeesMember_pdd"&gt;2.18 &lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;which
represents the closing price of Celsion&#x2019;s common stock as reported by Nasdaq on September 28, 2018 and February 19, 2019,
respectively. Each Inducement Option Grant will vest over &lt;span id="xdx_901_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_dc_c20190218__20190219__us-gaap--PlanNameAxis__custom--InducementOptionGrantsMember__srt--TitleOfIndividualAxis__custom--FiveNewEmployeesMember_zg6B4KigMCR1"&gt;three years&lt;/span&gt;, with one-third vesting on the one-year anniversary of the
employee&#x2019;s first day of employment with the Company and one-third vesting on the second and third anniversaries thereafter,
subject to the new employee&#x2019;s continued service relationship with the Company on each such date. Each Inducement Option Grant
has a ten-year term and is subject to the terms and conditions of the applicable stock option agreement. Each of Inducement Stock
Grant vested on the one-year anniversary of the employee&#x2019;s first day of employment with the Company is subject to the new
employee&#x2019;s continued service relationship with the Company through such date and is subject to the terms and conditions of the
applicable restricted stock agreement.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;As
of June 30, 2021, there were a total of &lt;span id="xdx_907_eus-gaap--CommonStockCapitalSharesReservedForFutureIssuance_c20210630__us-gaap--PlanNameAxis__custom--TwoThousandAndEighteenStockIncentivePlanMember_pdd"&gt;14,198,424
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;shares of Celsion common stock reserved for
issuance under the 2018 Plan, which were comprised of &lt;span id="xdx_909_eus-gaap--CommonStockCapitalSharesReservedForFutureIssuance_c20210630__us-gaap--AwardTypeAxis__custom--EquityStockAwardsMember__srt--StatementScenarioAxis__custom--GrantedUnderTwoThousandEighteenPlanAndTwoThousandSevenPlanMember_pdd"&gt;6,548,325
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;shares of Celsion common stock subject to equity
awards previously granted under the 2018 Plan and 2007 Plan and &lt;span id="xdx_90E_eus-gaap--CommonStockCapitalSharesReservedForFutureIssuance_iI_c20210630__us-gaap--PlanNameAxis__custom--TwoThousandAndEighteenPlanMember_z956AaBaeSe6"&gt;7,650,099
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;shares of Celsion common stock available for
future issuance under the 2018 Plan. As of June 30, 2021, there were a total of &lt;span id="xdx_90D_eus-gaap--CommonStockCapitalSharesReservedForFutureIssuance_iI_c20210630__us-gaap--AwardTypeAxis__custom--InducementAwardsMember_zxqedVkaaaz3"&gt;140,004
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;shares of Celsion common stock subject to outstanding
inducement awards.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;Total
compensation cost related to stock options and restricted stock awards amounted to $&lt;span id="xdx_90D_eus-gaap--AllocatedShareBasedCompensationExpense_pp0p0_c20210401__20210630__us-gaap--AwardTypeAxis__custom--EmployeeStockOptionAndRestrictedStockAwardsMember_zOmXtm9Xb4T7"&gt;793,619
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;and $&lt;span id="xdx_906_eus-gaap--AllocatedShareBasedCompensationExpense_pp0p0_c20200401__20200630__us-gaap--AwardTypeAxis__custom--EmployeeStockOptionAndRestrictedStockAwardsMember_zmb9KxLh1xzg"&gt;578,761
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;for the three-month periods ended June 30, 2021
and 2020, respectively. Of these amounts, $&lt;span id="xdx_902_eus-gaap--AllocatedShareBasedCompensationExpense_pp0p0_c20210401__20210630__us-gaap--AwardTypeAxis__custom--EmployeeStockOptionAndRestrictedStockAwardsMember__us-gaap--IncomeStatementLocationAxis__us-gaap--ResearchAndDevelopmentExpenseMember_zvAXbhtQ8ii9"&gt;299,581
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;and $&lt;span id="xdx_90B_eus-gaap--AllocatedShareBasedCompensationExpense_pp0p0_c20200401__20200630__us-gaap--AwardTypeAxis__custom--EmployeeStockOptionAndRestrictedStockAwardsMember__us-gaap--IncomeStatementLocationAxis__us-gaap--ResearchAndDevelopmentExpenseMember_zo7odFA6jb2j"&gt;200,186
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;was charged to research and development during
the three-month periods ended June 30, 2021 and 2020, respectively, and $&lt;span id="xdx_908_eus-gaap--AllocatedShareBasedCompensationExpense_pp0p0_c20210401__20210630__us-gaap--AwardTypeAxis__custom--EmployeeStockOptionAndRestrictedStockAwardsMember__us-gaap--IncomeStatementLocationAxis__us-gaap--GeneralAndAdministrativeExpenseMember_zsTEVS685Fp7"&gt;494,038
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;and $&lt;span id="xdx_908_eus-gaap--AllocatedShareBasedCompensationExpense_pp0p0_c20200401__20200630__us-gaap--AwardTypeAxis__custom--EmployeeStockOptionAndRestrictedStockAwardsMember__us-gaap--IncomeStatementLocationAxis__us-gaap--GeneralAndAdministrativeExpenseMember_z0BVdkASGh58"&gt;378,575
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;was charged to general and administrative expenses
during the three-month periods ended June 30, 2021 and 2020, respectively.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;Total
compensation cost related to stock options and restricted stock awards amounted to $&lt;span id="xdx_90B_eus-gaap--AllocatedShareBasedCompensationExpense_c20210101__20210630__us-gaap--AwardTypeAxis__custom--EmployeeStockOptionAndRestrictedStockAwardsMember_pp0p0"&gt;2,372,945
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;and $&lt;span id="xdx_909_eus-gaap--AllocatedShareBasedCompensationExpense_c20200101__20200630__us-gaap--AwardTypeAxis__custom--EmployeeStockOptionAndRestrictedStockAwardsMember_pp0p0"&gt;1,030,726
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;for the six-month periods ended June 30, 2021
and 2020, respectively. Of these amounts, $&lt;span id="xdx_904_eus-gaap--AllocatedShareBasedCompensationExpense_c20210101__20210630__us-gaap--AwardTypeAxis__custom--EmployeeStockOptionAndRestrictedStockAwardsMember__us-gaap--IncomeStatementLocationAxis__us-gaap--ResearchAndDevelopmentExpenseMember_pp0p0"&gt;882,088
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;and $&lt;span id="xdx_90B_eus-gaap--AllocatedShareBasedCompensationExpense_c20200101__20200630__us-gaap--AwardTypeAxis__custom--EmployeeStockOptionAndRestrictedStockAwardsMember__us-gaap--IncomeStatementLocationAxis__us-gaap--ResearchAndDevelopmentExpenseMember_pp0p0"&gt;378,122
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;was charged to research and development during
the six-month periods ended June 30, 2021 and 2020, respectively, and $&lt;span id="xdx_900_eus-gaap--AllocatedShareBasedCompensationExpense_c20210101__20210630__us-gaap--AwardTypeAxis__custom--EmployeeStockOptionAndRestrictedStockAwardsMember__us-gaap--IncomeStatementLocationAxis__us-gaap--GeneralAndAdministrativeExpenseMember_pp0p0"&gt;1,490,857
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;and $&lt;span id="xdx_902_eus-gaap--AllocatedShareBasedCompensationExpense_c20200101__20200630__us-gaap--AwardTypeAxis__custom--EmployeeStockOptionAndRestrictedStockAwardsMember__us-gaap--IncomeStatementLocationAxis__us-gaap--GeneralAndAdministrativeExpenseMember_pp0p0"&gt;652,604
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;was charged to general and administrative expenses
during the six-month periods ended June 30, 2021 and 2020, respectively.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;As
of June 30, 2021, there was $&lt;span id="xdx_903_eus-gaap--EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_iI_pn5n6_c20210630_zNzij1mXPAQe"&gt;3.2
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;million of total unrecognized compensation cost
related to non-vested stock-based compensation arrangements. That cost is expected to be recognized over a weighted-average period of
&lt;span id="xdx_906_eus-gaap--EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_dtY_c20210101__20210630_zE9oLHUCHx4d"&gt;1.2
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;years. The weighted average grant date fair values
of the stock options granted was $&lt;span id="xdx_907_eus-gaap--ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_c20210101__20210630_pdd"&gt;1.98
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;and $&lt;span id="xdx_90A_eus-gaap--ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_c20200101__20200630_pdd"&gt;3.10
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;during the six-month periods ended June 30, 2021
and 2020, respectively. A summary of stock option awards and restricted stock grants for the three-months ended June 30, 2021 is presented
below:&lt;/span&gt;&lt;/p&gt;

&lt;p id="xdx_897_ecustom--SummaryOfStockOptionAndRestrictedStockAwardsTableTextBlock_zdNvlcpS5MWa" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span id="xdx_8B5_zdwapitkW4Tb" style="font: 10pt Times New Roman, Times, Serif; display: none"&gt;Summary
of Stock Option Awards and Restricted Stock Grants&lt;/span&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%"&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="6" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Stock
    Options&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="6" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Restricted
    Stock Awards&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"&gt;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Weighted&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Average&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"&gt;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Options&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Outstanding&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"&gt;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Weighted&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Average&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Exercise&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Price&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"&gt;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Non-vested&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Restricted&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Stock&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Outstanding&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"&gt;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Weighted&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Average&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Grant&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Date&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Fair
                                            Value&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"&gt;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Contractual&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Terms
                                            of&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Equity&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Awards&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;(in
                                            years)&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="width: 35%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Equity awards outstanding at January
    1, 2021&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_987_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_iS_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zs8NivCzWEJl" style="width: 9%; text-align: right" title="Number Outstanding, Outstanding, Beginning balance"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;4,624,725&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98E_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_iS_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zjNzVF9yzIq2" style="width: 9%; text-align: right" title="Weighted Average Exercise Price, Outstanding, Beginning balance"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;2.77&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_984_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_iS_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--RestrictedStockMember_zqUlMKUubbcj" style="width: 9%; text-align: right" title="Number Outstanding, Non-vested stock awards, Outstanding, Beginning balance"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;2,750&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_987_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_iS_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--RestrictedStockMember_z740gWcrLMA3" style="width: 9%; text-align: right" title="Weighted Average Grant Date Fair Value, Non-vested stock awards, Outstanding, Beginning balance"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;0.89&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 9%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Equity awards granted&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_986_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_pdd" style="text-align: right" title="Number Outstanding, Options granted"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;2,154,000&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_986_eus-gaap--ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_pdd" style="text-align: right" title="Weighted Average Exercise Price, Options granted"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;2.18&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_987_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--RestrictedStockMember_pdd" style="text-align: right" title="Number Outstanding, Non-vested stock awards, Granted"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;7,000&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98E_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--RestrictedStockMember_pdd" style="text-align: right" title="Weighted Average Grant Date Fair Value, Non-vested stock awards, Granted"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;1.38&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Equity awards exercised or vested and issued&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_980_eus-gaap--StockIssuedDuringPeriodSharesStockOptionsExercised_iN_di_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zz9vwH6dwF9d" style="text-align: right" title="Number Outstanding, Options exercised or vested and issued"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;(7,500&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;)&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_985_eus-gaap--ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_pdd" style="text-align: right" title="Weighted Average Exercise Price, Options exercised or vested and issued"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;0.63&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_984_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--RestrictedStockMember_pdd" style="text-align: right" title="Number Outstanding, Non-vested stock awards, exercised or vested and issued"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl1157"&gt;-&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98A_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--RestrictedStockMember_pdd" style="text-align: right" title="Weighted Average Grant Date Fair Value, Non-vested stock awards, exercised or vested and issued"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl1159"&gt;-&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="text-align: left; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Equity awards forfeited,
    cancelled or expired&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_983_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod_iN_di_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zfFZt1TlTe2f" style="border-bottom: Black 1.5pt solid; text-align: right" title="Number Outstanding, Options canceled or expired"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;(92,646&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;)&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_981_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_pdd" style="padding-bottom: 1.5pt; text-align: right" title="Weighted Average Exercise Price, Options canceled or expired"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;2.69&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98B_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--RestrictedStockMember_pdd" style="border-bottom: Black 1.5pt solid; text-align: right" title="Number Outstanding, Non-vested stock awards, Forfeited"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl1165"&gt;-&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98E_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--RestrictedStockMember_pdd" style="padding-bottom: 1.5pt; text-align: right" title="Weighted Average Grant Date Fair Value, Non-vested stock awards, Forfeited"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl1167"&gt;-&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="text-align: left; padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Equity awards outstanding
    at June 30, 2021&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98C_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_iE_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zZRQKzEajN1k" style="border-bottom: Black 2.5pt double; text-align: right" title="Number Outstanding, Outstanding, Ending balance"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;6,678,579&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98F_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_iE_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zoAmbc7LD97b" style="padding-bottom: 2.5pt; text-align: right" title="Weighted Average Exercise Price, Outstanding, Ending balance"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;2.58&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98F_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_iE_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--RestrictedStockMember_z2MhcObQKuDf" style="border-bottom: Black 2.5pt double; text-align: right" title="Number Outstanding, Non-vested stock awards, Outstanding, Ending balance"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;9,750&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_985_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_iE_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--RestrictedStockMember_zkzFCAGm1tvg" style="padding-bottom: 2.5pt; text-align: right" title="Weighted Average Grant Date Fair Value, Non-vested stock awards, Outstanding, Ending balance"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;1.27&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: right"&gt;&lt;span id="xdx_905_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_dtY_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zbBH4fvhOS5i" style="font-family: Times New Roman, Times, Serif"&gt;8.0&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="text-align: left; padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Aggregate intrinsic
    value of outstanding equity awards at June 30, 2021&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_986_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_iE_pp0p0_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zgaOVGFesug1" style="border-bottom: Black 2.5pt double; text-align: right" title="Aggregate Intrinsic Value, Outstanding, Ending balance"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;12,145&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98C_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding_iE_pp0p0_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--RestrictedStockMember_z7Sj2pid0O4k" style="border-bottom: Black 2.5pt double; text-align: right" title="Aggregate Intrinsic Value, Non-vested stock awards, Outstanding, Ending balance"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;12,383&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="text-align: left; padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Equity awards exercisable
    at June 30, 2021&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_980_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_iE_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zCGoAEnaXIjc" style="border-bottom: Black 2.5pt double; text-align: right" title="Number Outstanding, Exercisable, Ending balance"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;4,329,286&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98B_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_iE_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zrk5BnhfHVWh" style="padding-bottom: 2.5pt; text-align: right" title="Weighted Average Exercise Price, Exercisable, Ending balance"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;2.73&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: right"&gt;&lt;span id="xdx_90A_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_dtY_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_ziiBCIpqp7bb" style="font-family: Times New Roman, Times, Serif"&gt;7.8&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="text-align: left; padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Aggregate intrinsic
    value of equity awards exercisable at June 30, 2021&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_984_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1_iE_pp0p0_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zY55dMDQ9Goa" style="border-bottom: Black 2.5pt double; text-align: right" title="Aggregate Intrinsic Value, Exercisable, Ending balance"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;1,650&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p id="xdx_8A1_z5CbKCmiKN2l" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;




&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p id="xdx_89C_eus-gaap--ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock_zvVrpPRBlNSd" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;The
fair values of stock options granted were estimated at the date of grant using the Black-Scholes option pricing model. The Black-Scholes
model was originally developed for use in estimating the fair value of traded options, which have different characteristics from Celsion&#x2019;s
stock options. The model is also sensitive to changes in assumptions, which can materially affect the fair value estimate. The Company
used the following assumptions for determining the fair value of options granted under the Black-Scholes option pricing model:&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;span id="xdx_8B1_zAvmRlNBERij" style="display: none"&gt;Schedule
of Assumptions Used to Determine Fair Value of Options Granted&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"/&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%"&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1.5pt"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif; padding-bottom: 1.5pt"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: bold 10pt Times New Roman, Times, Serif; padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td colspan="5" style="border-bottom: Black 1.5pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Six
                                            Months Ended June 30, &#160;&lt;/b&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1.5pt"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif; padding-bottom: 1.5pt"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: bold 10pt Times New Roman, Times, Serif; padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1.5pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;2021&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif; padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif; padding-bottom: 1.5pt"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: bold 10pt Times New Roman, Times, Serif; padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1.5pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;2020&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif; padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 60%; text-align: left"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;Risk-free
    interest rate&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 16%; text-align: right"&gt;&lt;span id="xdx_90C_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum_pid_dp_c20210101__20210630_zbHSZSVsxGng" style="font: 10pt Times New Roman, Times, Serif"&gt;1.56
                                            &lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;to &lt;span id="xdx_90C_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum_pid_dp_c20210101__20210630_z61dC6LUBpG7"&gt;1.74&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;%&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 16%; text-align: right"&gt;&lt;span id="xdx_90D_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum_pid_dp_c20200101__20200630_zsBDu6znfba7" style="font: 10pt Times New Roman, Times, Serif"&gt;0.71
                                            &lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;to &lt;span id="xdx_903_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum_pid_dp_c20200101__20200630_z4h3tRgTmWW3"&gt;1.33&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;%&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;Expected
    volatility&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span id="xdx_908_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum_pid_dp_c20210101__20210630_zOviDMd7lCtf" style="font: 10pt Times New Roman, Times, Serif"&gt;106.8
                                            &lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;to &lt;span id="xdx_904_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum_pid_dp_c20210101__20210630_zY4Mod2WgDI"&gt;113.0&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;%&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span id="xdx_901_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum_pid_dp_c20200101__20200630_zNHIZ28tcg1d" style="font: 10pt Times New Roman, Times, Serif"&gt;100.4
                                            &lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;to &lt;span id="xdx_904_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum_pid_dp_c20200101__20200630_zmTjM8Vk6KF7"&gt;104.2&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;%&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;Expected
    life (in years)&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span id="xdx_90D_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_dtY_c20210101__20210630__srt--RangeAxis__srt--MinimumMember_zUnxBpAcWXsk" style="font: 10pt Times New Roman, Times, Serif"&gt;7.5
                                            &lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;to &lt;span id="xdx_904_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_dtY_c20210101__20210630__srt--RangeAxis__srt--MaximumMember_ziitPTyChS7f"&gt;10.0&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;span id="xdx_903_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_dtY_c20200101__20200630__srt--RangeAxis__srt--MinimumMember_z68gZQbmans4"&gt;8.5
                                            &lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;to
                                            &lt;span id="xdx_901_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_dtY_c20200101__20200630__srt--RangeAxis__srt--MaximumMember_zW5npx7wLpgg"&gt;10.0&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;Expected
    dividend yield&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98F_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_pid_dpxL_c20210101__20210630_zIH0kzCyLy2g" style="font: 10pt Times New Roman, Times, Serif; text-align: right" title="Expected dividend yield::XDX::0"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl1203"&gt;-&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;%&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_981_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_pid_dpxL_c20200101__20200630_zv50SIQiZlGk" style="font: 10pt Times New Roman, Times, Serif; text-align: right" title="Expected dividend yield::XDX::0"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl1205"&gt;-&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;%&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;

&lt;p id="xdx_8A3_z2lHzkFiftZ1" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;Expected
volatilities utilized in the model are based on historical volatility of the Company&#x2019;s stock price. The risk-free interest rate
is derived from values assigned to U.S. Treasury bonds with terms that approximate the expected option lives in effect at the time of
grant.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

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      decimals="INF"
      unitRef="USDPShares">3.10</us-gaap:ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice>
    <CLSN:SummaryOfStockOptionAndRestrictedStockAwardsTableTextBlock contextRef="From2021-01-01to2021-06-30">&lt;p id="xdx_897_ecustom--SummaryOfStockOptionAndRestrictedStockAwardsTableTextBlock_zdNvlcpS5MWa" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span id="xdx_8B5_zdwapitkW4Tb" style="font: 10pt Times New Roman, Times, Serif; display: none"&gt;Summary
of Stock Option Awards and Restricted Stock Grants&lt;/span&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%"&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="6" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Stock
    Options&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font-weight: bold; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="6" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Restricted
    Stock Awards&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; font-weight: bold"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"&gt;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Weighted&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Average&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"&gt;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Options&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Outstanding&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"&gt;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Weighted&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Average&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Exercise&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Price&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"&gt;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Non-vested&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Restricted&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Stock&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Outstanding&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"&gt;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Weighted&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Average&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Grant&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Date&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Fair
                                            Value&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"&gt;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Contractual&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Terms
                                            of&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Equity&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Awards&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;(in
                                            years)&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="width: 35%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Equity awards outstanding at January
    1, 2021&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_987_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_iS_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zs8NivCzWEJl" style="width: 9%; text-align: right" title="Number Outstanding, Outstanding, Beginning balance"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;4,624,725&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98E_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_iS_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zjNzVF9yzIq2" style="width: 9%; text-align: right" title="Weighted Average Exercise Price, Outstanding, Beginning balance"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;2.77&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_984_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_iS_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--RestrictedStockMember_zqUlMKUubbcj" style="width: 9%; text-align: right" title="Number Outstanding, Non-vested stock awards, Outstanding, Beginning balance"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;2,750&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_987_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_iS_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--RestrictedStockMember_z740gWcrLMA3" style="width: 9%; text-align: right" title="Weighted Average Grant Date Fair Value, Non-vested stock awards, Outstanding, Beginning balance"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;0.89&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 9%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Equity awards granted&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_986_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_pdd" style="text-align: right" title="Number Outstanding, Options granted"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;2,154,000&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_986_eus-gaap--ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_pdd" style="text-align: right" title="Weighted Average Exercise Price, Options granted"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;2.18&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_987_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--RestrictedStockMember_pdd" style="text-align: right" title="Number Outstanding, Non-vested stock awards, Granted"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;7,000&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98E_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--RestrictedStockMember_pdd" style="text-align: right" title="Weighted Average Grant Date Fair Value, Non-vested stock awards, Granted"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;1.38&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Equity awards exercised or vested and issued&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_980_eus-gaap--StockIssuedDuringPeriodSharesStockOptionsExercised_iN_di_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zz9vwH6dwF9d" style="text-align: right" title="Number Outstanding, Options exercised or vested and issued"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;(7,500&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;)&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_985_eus-gaap--ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_pdd" style="text-align: right" title="Weighted Average Exercise Price, Options exercised or vested and issued"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;0.63&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_984_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--RestrictedStockMember_pdd" style="text-align: right" title="Number Outstanding, Non-vested stock awards, exercised or vested and issued"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl1157"&gt;-&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98A_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--RestrictedStockMember_pdd" style="text-align: right" title="Weighted Average Grant Date Fair Value, Non-vested stock awards, exercised or vested and issued"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl1159"&gt;-&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="text-align: left; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Equity awards forfeited,
    cancelled or expired&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_983_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod_iN_di_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zfFZt1TlTe2f" style="border-bottom: Black 1.5pt solid; text-align: right" title="Number Outstanding, Options canceled or expired"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;(92,646&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;)&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_981_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_pdd" style="padding-bottom: 1.5pt; text-align: right" title="Weighted Average Exercise Price, Options canceled or expired"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;2.69&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98B_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--RestrictedStockMember_pdd" style="border-bottom: Black 1.5pt solid; text-align: right" title="Number Outstanding, Non-vested stock awards, Forfeited"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl1165"&gt;-&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98E_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--RestrictedStockMember_pdd" style="padding-bottom: 1.5pt; text-align: right" title="Weighted Average Grant Date Fair Value, Non-vested stock awards, Forfeited"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl1167"&gt;-&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="text-align: left; padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Equity awards outstanding
    at June 30, 2021&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98C_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_iE_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zZRQKzEajN1k" style="border-bottom: Black 2.5pt double; text-align: right" title="Number Outstanding, Outstanding, Ending balance"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;6,678,579&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98F_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_iE_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zoAmbc7LD97b" style="padding-bottom: 2.5pt; text-align: right" title="Weighted Average Exercise Price, Outstanding, Ending balance"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;2.58&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98F_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_iE_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--RestrictedStockMember_z2MhcObQKuDf" style="border-bottom: Black 2.5pt double; text-align: right" title="Number Outstanding, Non-vested stock awards, Outstanding, Ending balance"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;9,750&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_985_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_iE_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--RestrictedStockMember_zkzFCAGm1tvg" style="padding-bottom: 2.5pt; text-align: right" title="Weighted Average Grant Date Fair Value, Non-vested stock awards, Outstanding, Ending balance"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;1.27&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: right"&gt;&lt;span id="xdx_905_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_dtY_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zbBH4fvhOS5i" style="font-family: Times New Roman, Times, Serif"&gt;8.0&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="text-align: left; padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Aggregate intrinsic
    value of outstanding equity awards at June 30, 2021&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_986_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_iE_pp0p0_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zgaOVGFesug1" style="border-bottom: Black 2.5pt double; text-align: right" title="Aggregate Intrinsic Value, Outstanding, Ending balance"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;12,145&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98C_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding_iE_pp0p0_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--RestrictedStockMember_z7Sj2pid0O4k" style="border-bottom: Black 2.5pt double; text-align: right" title="Aggregate Intrinsic Value, Non-vested stock awards, Outstanding, Ending balance"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;12,383&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="text-align: left; padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Equity awards exercisable
    at June 30, 2021&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_980_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_iE_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zCGoAEnaXIjc" style="border-bottom: Black 2.5pt double; text-align: right" title="Number Outstanding, Exercisable, Ending balance"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;4,329,286&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98B_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_iE_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zrk5BnhfHVWh" style="padding-bottom: 2.5pt; text-align: right" title="Weighted Average Exercise Price, Exercisable, Ending balance"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;2.73&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: right"&gt;&lt;span id="xdx_90A_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_dtY_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_ziiBCIpqp7bb" style="font-family: Times New Roman, Times, Serif"&gt;7.8&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="text-align: left; padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Aggregate intrinsic
    value of equity awards exercisable at June 30, 2021&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_984_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1_iE_pp0p0_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zY55dMDQ9Goa" style="border-bottom: Black 2.5pt double; text-align: right" title="Aggregate Intrinsic Value, Exercisable, Ending balance"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;1,650&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

</CLSN:SummaryOfStockOptionAndRestrictedStockAwardsTableTextBlock>
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      contextRef="AsOf2020-12-31_us-gaap_EmployeeStockOptionMember"
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      unitRef="Shares">4624725</us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber>
    <us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
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      unitRef="USDPShares">2.77</us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice>
    <us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
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      unitRef="Shares">2750</us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber>
    <us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
      contextRef="AsOf2020-12-31_us-gaap_RestrictedStockMember"
      decimals="INF"
      unitRef="USDPShares">0.89</us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue>
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      unitRef="Shares">2154000</us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod>
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      contextRef="From2021-01-012021-06-30_us-gaap_EmployeeStockOptionMember"
      decimals="INF"
      unitRef="USDPShares">2.18</us-gaap:ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice>
    <us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
      contextRef="From2021-01-012021-06-30_us-gaap_RestrictedStockMember"
      decimals="INF"
      unitRef="Shares">7000</us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod>
    <us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
      contextRef="From2021-01-012021-06-30_us-gaap_RestrictedStockMember"
      decimals="INF"
      unitRef="USDPShares">1.38</us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue>
    <us-gaap:StockIssuedDuringPeriodSharesStockOptionsExercised
      contextRef="From2021-01-012021-06-30_us-gaap_EmployeeStockOptionMember"
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      contextRef="AsOf2021-06-30_us-gaap_EmployeeStockOptionMember"
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      unitRef="USDPShares">2.58</us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice>
    <us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
      contextRef="AsOf2021-06-30_us-gaap_RestrictedStockMember"
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    <us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
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      contextRef="AsOf2021-06-30_us-gaap_EmployeeStockOptionMember"
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    <us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
      contextRef="AsOf2021-06-30_us-gaap_EmployeeStockOptionMember"
      decimals="INF"
      unitRef="USDPShares">2.73</us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice>
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    <us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
      contextRef="AsOf2021-06-30_us-gaap_EmployeeStockOptionMember"
      decimals="0"
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    <us-gaap:ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock contextRef="From2021-01-01to2021-06-30">&lt;p id="xdx_89C_eus-gaap--ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock_zvVrpPRBlNSd" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;The
fair values of stock options granted were estimated at the date of grant using the Black-Scholes option pricing model. The Black-Scholes
model was originally developed for use in estimating the fair value of traded options, which have different characteristics from Celsion&#x2019;s
stock options. The model is also sensitive to changes in assumptions, which can materially affect the fair value estimate. The Company
used the following assumptions for determining the fair value of options granted under the Black-Scholes option pricing model:&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;span id="xdx_8B1_zAvmRlNBERij" style="display: none"&gt;Schedule
of Assumptions Used to Determine Fair Value of Options Granted&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"/&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%"&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1.5pt"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif; padding-bottom: 1.5pt"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: bold 10pt Times New Roman, Times, Serif; padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td colspan="5" style="border-bottom: Black 1.5pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Six
                                            Months Ended June 30, &#160;&lt;/b&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1.5pt"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif; padding-bottom: 1.5pt"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: bold 10pt Times New Roman, Times, Serif; padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1.5pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;2021&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif; padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif; padding-bottom: 1.5pt"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: bold 10pt Times New Roman, Times, Serif; padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1.5pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;2020&lt;/span&gt;&lt;/td&gt;&lt;td style="font: bold 10pt Times New Roman, Times, Serif; padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 60%; text-align: left"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;Risk-free
    interest rate&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 16%; text-align: right"&gt;&lt;span id="xdx_90C_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum_pid_dp_c20210101__20210630_zbHSZSVsxGng" style="font: 10pt Times New Roman, Times, Serif"&gt;1.56
                                            &lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;to &lt;span id="xdx_90C_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum_pid_dp_c20210101__20210630_z61dC6LUBpG7"&gt;1.74&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;%&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 2%"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 16%; text-align: right"&gt;&lt;span id="xdx_90D_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum_pid_dp_c20200101__20200630_zsBDu6znfba7" style="font: 10pt Times New Roman, Times, Serif"&gt;0.71
                                            &lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;to &lt;span id="xdx_903_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum_pid_dp_c20200101__20200630_z4h3tRgTmWW3"&gt;1.33&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;%&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;Expected
    volatility&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span id="xdx_908_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum_pid_dp_c20210101__20210630_zOviDMd7lCtf" style="font: 10pt Times New Roman, Times, Serif"&gt;106.8
                                            &lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;to &lt;span id="xdx_904_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum_pid_dp_c20210101__20210630_zY4Mod2WgDI"&gt;113.0&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;%&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span id="xdx_901_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum_pid_dp_c20200101__20200630_zNHIZ28tcg1d" style="font: 10pt Times New Roman, Times, Serif"&gt;100.4
                                            &lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;to &lt;span id="xdx_904_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum_pid_dp_c20200101__20200630_zmTjM8Vk6KF7"&gt;104.2&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;%&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;Expected
    life (in years)&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span id="xdx_90D_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_dtY_c20210101__20210630__srt--RangeAxis__srt--MinimumMember_zUnxBpAcWXsk" style="font: 10pt Times New Roman, Times, Serif"&gt;7.5
                                            &lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;to &lt;span id="xdx_904_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_dtY_c20210101__20210630__srt--RangeAxis__srt--MaximumMember_ziitPTyChS7f"&gt;10.0&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;span id="xdx_903_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_dtY_c20200101__20200630__srt--RangeAxis__srt--MinimumMember_z68gZQbmans4"&gt;8.5
                                            &lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;to
                                            &lt;span id="xdx_901_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_dtY_c20200101__20200630__srt--RangeAxis__srt--MaximumMember_zW5npx7wLpgg"&gt;10.0&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;Expected
    dividend yield&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98F_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_pid_dpxL_c20210101__20210630_zIH0kzCyLy2g" style="font: 10pt Times New Roman, Times, Serif; text-align: right" title="Expected dividend yield::XDX::0"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl1203"&gt;-&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;%&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_981_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_pid_dpxL_c20200101__20200630_zv50SIQiZlGk" style="font: 10pt Times New Roman, Times, Serif; text-align: right" title="Expected dividend yield::XDX::0"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl1205"&gt;-&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;%&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;

</us-gaap:ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock>
    <us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum
      contextRef="From2021-01-01to2021-06-30"
      decimals="INF"
      unitRef="Percentage">0.0156</us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum>
    <us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum
      contextRef="From2021-01-01to2021-06-30"
      decimals="INF"
      unitRef="Percentage">0.0174</us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum>
    <us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum
      contextRef="From2020-01-012020-06-30"
      decimals="INF"
      unitRef="Percentage">0.0071</us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum>
    <us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum
      contextRef="From2020-01-012020-06-30"
      decimals="INF"
      unitRef="Percentage">0.0133</us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum>
    <us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum
      contextRef="From2021-01-01to2021-06-30"
      decimals="INF"
      unitRef="Percentage">1.068</us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum>
    <us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum
      contextRef="From2021-01-01to2021-06-30"
      decimals="INF"
      unitRef="Percentage">1.130</us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum>
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      contextRef="From2020-01-012020-06-30"
      decimals="INF"
      unitRef="Percentage">1.004</us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum>
    <us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum
      contextRef="From2020-01-012020-06-30"
      decimals="INF"
      unitRef="Percentage">1.042</us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum>
    <us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1 contextRef="From2021-01-012021-06-30_srt_MinimumMember">P7Y6M</us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1>
    <us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1 contextRef="From2021-01-012021-06-30_srt_MaximumMember">P10Y</us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1>
    <us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1 contextRef="From2020-01-012020-06-30_srt_MinimumMember">P8Y6M</us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1>
    <us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1 contextRef="From2020-01-012020-06-30_srt_MaximumMember">P10Y</us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1>
    <CLSN:EarnoutMilestoneLiabilityDisclosureTextBlock contextRef="From2021-01-01to2021-06-30">&lt;p id="xdx_801_ecustom--EarnoutMilestoneLiabilityDisclosureTextBlock_zWkAYpPd0my2" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Note
14. &lt;span id="xdx_820_zevo1lJWXTn"&gt;Earn-Out Milestone Liability&lt;/span&gt;&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;On
March 28, 2019, the Company and EGWU, Inc, entered into an amendment to its purchase agreement (&#x201c;Amended Asset Purchase Agreement&#x201d;),
whereby payment of the earnout milestone liability related to the Ovarian Cancer Indication of $&lt;span id="xdx_90F_ecustom--EarnoutMilestoneLiability1_iI_pn5n6_c20190328__us-gaap--TypeOfArrangementAxis__custom--AmendedAssetPurchaseAgreementMember__us-gaap--RelatedPartyTransactionAxis__custom--AchievingMilestoneWithInOneYearMember_zKFdi26YYdQf"&gt;12.4
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;million had been modified. The Company has the
option to make the payment as follows:&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse"&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;a)&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;span id="xdx_903_ecustom--EarnoutMilestoneLiability1_iI_pn5n6_c20190328__us-gaap--TypeOfArrangementAxis__custom--AmendedAssetPurchaseAgreementMember__us-gaap--RelatedPartyTransactionAxis__custom--CertainBusinessDaysOfAchievingMilestoneMember_zsLTm1kmMUok"&gt;7.0
    &lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;million in cash within 10 business days of
    achieving the milestone; or&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;b)&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;span id="xdx_901_ecustom--EarnoutMilestoneLiability1_iI_pn5n6_c20190328__us-gaap--TypeOfArrangementAxis__custom--AmendedAssetPurchaseAgreementMember_zWYkwwuaJn8d"&gt;12.4
    &lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;million in cash, common stock of the Company,
    or a combination of either, within one year of achieving the milestone.&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;
&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;As
of June 30, 2021, March 31, 2021, and December 31, 2020, the Company fair valued the earn-out milestone liability at $&lt;span id="xdx_907_eus-gaap--BusinessCombinationConsiderationTransferredLiabilitiesIncurred_pn5n6_c20210101__20210630__us-gaap--BusinessAcquisitionAxis__custom--EGWCMember__us-gaap--TypeOfArrangementAxis__custom--FairValueEarnoutMilestoneLiabilityMember_zjvRVWZhGx1c"&gt;7.1
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;million, $&lt;span id="xdx_909_eus-gaap--BusinessCombinationConsiderationTransferredLiabilitiesIncurred_pn5n6_c20210101__20210331__us-gaap--BusinessAcquisitionAxis__custom--EGWCMember__us-gaap--TypeOfArrangementAxis__custom--FairValueEarnoutMilestoneLiabilityMember_z6g6Qd6I8Dqc"&gt;7.2
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;million and $&lt;span id="xdx_906_eus-gaap--BusinessCombinationConsiderationTransferredLiabilitiesIncurred_pn5n6_c20200101__20201231__us-gaap--BusinessAcquisitionAxis__custom--EGWCMember__us-gaap--TypeOfArrangementAxis__custom--FairValueEarnoutMilestoneLiabilityMember_zfxlEFu7gUWe"&gt;7.0
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;million, respectively, and recognized a non-cash
benefit of $&lt;span id="xdx_900_ecustom--NoncashChargeOnEarnoutMilestoneLiability_pn5n6_c20210401__20210630__us-gaap--BusinessAcquisitionAxis__custom--EGWCMember_zkTm03nK4Z6c"&gt;0.1
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;million for the three-months ended June 30, 2021
and a non-cash charge of $&lt;span id="xdx_909_ecustom--NoncashChargeOnEarnoutMilestoneLiability_pn5n6_c20210101__20210630__us-gaap--BusinessAcquisitionAxis__custom--EGWCMember_zMn6JPDjG6Ea"&gt;0.1
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;million for the six-months ended June 30, 2021.
&lt;span id="xdx_90C_ecustom--EarnoutPaymentOptionsDescription_c20210101__20210630__us-gaap--BusinessAcquisitionAxis__custom--EGWCMember"&gt;In
assessing the earnout milestone liability at June 30, 2021 and March 31, 2021, the Company fair valued each of the two payment options
per the Amended Asset Purchase Agreement and weighted them at 50% / 50% probability for the $7.0 million and the $12.4 million payments,
respectively.&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;As
of June 30, 2020, March 31, 2020, and December 31, 2019, the Company fair valued the earn-out milestone liability at $&lt;span id="xdx_903_eus-gaap--BusinessCombinationConsiderationTransferredLiabilitiesIncurred_pn5n6_c20200101__20200630__us-gaap--BusinessAcquisitionAxis__custom--EGWCMember__us-gaap--TypeOfArrangementAxis__custom--FairValueEarnoutMilestoneLiabilityMember_zdUaHYWPIH78"&gt;6.0
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;million, $&lt;span id="xdx_90F_eus-gaap--BusinessCombinationConsiderationTransferredLiabilitiesIncurred_pn5n6_c20200101__20200331__us-gaap--BusinessAcquisitionAxis__custom--EGWCMember__us-gaap--TypeOfArrangementAxis__custom--FairValueEarnoutMilestoneLiabilityMember_ziEPznTBpyw6"&gt;5.8
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;million,&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;
and $&lt;span id="xdx_907_eus-gaap--BusinessCombinationConsiderationTransferredLiabilitiesIncurred_pn5n6_c20190101__20191231__us-gaap--BusinessAcquisitionAxis__custom--EGWCMember__us-gaap--TypeOfArrangementAxis__custom--FairValueEarnoutMilestoneLiabilityMember_zsBFzoSykRF5"&gt;5.7
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;million, respectively and recognized a non-cash
charge of $&lt;span id="xdx_905_ecustom--NoncashChargeOnEarnoutMilestoneLiability_pn5n6_c20200401__20200630__us-gaap--BusinessAcquisitionAxis__custom--EGWCMember_zHV7NOomI5m"&gt;0.2
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;and $&lt;span id="xdx_903_ecustom--NoncashChargeOnEarnoutMilestoneLiability_pn5n6_c20200101__20200630__us-gaap--BusinessAcquisitionAxis__custom--EGWCMember_zmg9dSrazTr3"&gt;0.3
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;million for the three-month and six-month periods
ended June 30, 2020, respectively. &lt;span id="xdx_90A_ecustom--EarnoutPaymentOptionsDescription_c20200101__20200630__us-gaap--BusinessAcquisitionAxis__custom--EGWCMember"&gt;In
assessing the earnout milestone liability at June 30, 2020 and March 31, 2020, the Company fair valued each of the two payment options
per the Amended Asset Purchase Agreement and weighted them at 80% / 20% probability for the $7.0 million and the $12.4 million
payments, respectively.&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p id="xdx_896_ecustom--ScheduleOfChangesInEarnOutMilestoneLiabilitiesTableTextBlock_zg2vwNiSH1K5" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;The
following is a summary of the changes in the earn-out milestone liability for the six-month period ended June 30, 2021:&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;span id="xdx_8B2_z8jvCwx4n2j5" style="display: none"&gt;Schedule
of Changes in Earn-out Milestone Liability&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%"&gt;
  &lt;tr style="display: none; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="display: none; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="display: none"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="display: none; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="display: none; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="display: none; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="width: 80%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Balance at January 1, 2021&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_981_ecustom--EarnoutMilestoneLiability_iS_pp0p0_c20210101__20210630_zfgHFwac9LC5" style="width: 16%; text-align: right" title="Earn-out liabilities, beginning balance"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;(7,018,000&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;)&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Non-cash loss from the
    change in fair value&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98A_ecustom--GainLossFromChangeInFairValueOfEarnOutMilestoneLiability_c20210101__20210630_pp0p0" style="border-bottom: Black 1.5pt solid; text-align: right" title="Non-cash gain loss from the adjustment for the change in fair value"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;(70,000&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;)&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Balance at June 30, 2021&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98A_ecustom--EarnoutMilestoneLiability_iE_pp0p0_c20210101__20210630_zF3silNymLdi" style="border-bottom: Black 2.5pt double; text-align: right" title="Earn-out liabilities, ending balance"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;(7,088,000&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;)&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;

&lt;p id="xdx_8A1_zh5NamNYDdCg" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p id="xdx_898_ecustom--ScheduleOfRiskadjustmentAssessmentTableTextBlock_zO1NEdKx5kH" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;The
following is a schedule of the Company&#x2019;s risk-adjustment assessment of each milestone:&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;span id="xdx_8BD_zLRJ6Thwwb7i" style="display: none"&gt;Schedule
of Risk Adjustment Assessment&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%"&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Date&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"&gt;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Risk-adjustment
                                            Assessment&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;of
                                            Achieving Each Milestone&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Discount
    Rate&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: center"&gt;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Estimated
                                            Time&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;to
                                            Achieve&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td style="text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="width: 44%; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;June 30, 2021&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98C_ecustom--RiskadjustmentAssessmentOfAchievingMilestone_pid_dp_c20210101__20210630_ztRZNKc1f1I" style="width: 13%; text-align: right" title="Risk-adjustment Assessment of achieving each Milestone"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;80&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;%&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_983_ecustom--DiscountRatesOnMileStoneLiabilities_pid_dp_c20210101__20210630_ztDD9dRCkHqj" style="width: 13%; text-align: right" title="Discount Rate"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;9&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;%&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="width: 20%; text-align: right"&gt;&lt;span id="xdx_90B_ecustom--EstimatedTimeToAchieveMileStone_dtY_c20210101__20210630__srt--RangeAxis__srt--MinimumMember_ztCH7vWA4Fdg" style="font-family: Times New Roman, Times, Serif"&gt;0.42
    &lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;to &lt;span id="xdx_906_ecustom--EstimatedTimeToAchieveMileStone_dtY_c20210101__20210630__srt--RangeAxis__srt--MaximumMember_zevrFDAxNcCi"&gt;1.42
    &lt;/span&gt;&lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;years&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;March 31, 2021&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98A_ecustom--RiskadjustmentAssessmentOfAchievingMilestone_pid_dp_c20210101__20210331_zY1Iv8PYEvyc" style="text-align: right" title="Risk-adjustment Assessment of achieving each Milestone"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;80&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;%&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98D_ecustom--DiscountRatesOnMileStoneLiabilities_pid_dp_c20210101__20210331_zvh5TKmdNpp1" style="text-align: right" title="Discount Rate"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;9&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;%&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: right"&gt;&lt;span id="xdx_907_ecustom--EstimatedTimeToAchieveMileStone_dtY_c20210101__20210331__srt--RangeAxis__srt--MinimumMember_z2v5sX2fdw75" style="font-family: Times New Roman, Times, Serif"&gt;0.29
    &lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;to &lt;span id="xdx_901_ecustom--EstimatedTimeToAchieveMileStone_dtY_c20210101__20210331__srt--RangeAxis__srt--MaximumMember_zv6kYZh3KWK1"&gt;1.29
    &lt;/span&gt;&lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;years&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;December 31, 2020&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_982_ecustom--RiskadjustmentAssessmentOfAchievingMilestone_pid_dp_c20200101__20201231_zmiycbmZaiel" style="text-align: right" title="Risk-adjustment Assessment of achieving each Milestone"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;80&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;%&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_980_ecustom--DiscountRatesOnMileStoneLiabilities_pid_dp_c20200101__20201231_zuXh5ODTXFGg" style="text-align: right" title="Discount Rate"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;9&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;%&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: right"&gt;&lt;span id="xdx_90C_ecustom--EstimatedTimeToAchieveMileStone_dtY_c20200101__20201231__srt--RangeAxis__srt--MinimumMember_zmbUCcKbn2fb" style="font-family: Times New Roman, Times, Serif"&gt;0.54
    &lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;to &lt;span id="xdx_902_ecustom--EstimatedTimeToAchieveMileStone_dtY_c20200101__20201231__srt--RangeAxis__srt--MaximumMember_zmJM2FABs6Vf"&gt;1.54
    &lt;/span&gt;&lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;years&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;June 30, 2020&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_988_ecustom--RiskadjustmentAssessmentOfAchievingMilestone_pid_dp_c20200101__20200630_zGc1e3DNHwwj" style="text-align: right" title="Risk-adjustment Assessment of achieving each Milestone"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;80&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;%&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_983_ecustom--DiscountRatesOnMileStoneLiabilities_pid_dp_c20200101__20200630_zX0YcalEWrh7" style="text-align: right" title="Discount Rate"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;9&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;%&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: right"&gt;&lt;span id="xdx_90C_ecustom--EstimatedTimeToAchieveMileStone_dtY_c20200101__20200630__srt--RangeAxis__srt--MinimumMember_zt7tUOXUIJAf" style="font-family: Times New Roman, Times, Serif"&gt;0.54
    &lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;to &lt;span id="xdx_90C_ecustom--EstimatedTimeToAchieveMileStone_dtY_c20200101__20200630__srt--RangeAxis__srt--MaximumMember_zl8FIdnX8JR"&gt;1.54
    &lt;/span&gt;&lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;years&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;March 31, 2020&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98E_ecustom--RiskadjustmentAssessmentOfAchievingMilestone_pid_dp_c20200101__20200331_zM3RagkkzXQh" style="text-align: right" title="Risk-adjustment Assessment of achieving each Milestone"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;80&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;%&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98D_ecustom--DiscountRatesOnMileStoneLiabilities_pid_dp_c20200101__20200331_zSl9XdEFA8i8" style="text-align: right" title="Discount Rate"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;9&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;%&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: right"&gt;&lt;span id="xdx_903_ecustom--EstimatedTimeToAchieveMileStone_dtY_c20200101__20200331__srt--RangeAxis__srt--MinimumMember_zTxJcY5cbtB8" style="font-family: Times New Roman, Times, Serif"&gt;1.04
    &lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;to &lt;span id="xdx_904_ecustom--EstimatedTimeToAchieveMileStone_dtY_c20200101__20200331__srt--RangeAxis__srt--MaximumMember_zW6qWcQqJyWj"&gt;2.04
    &lt;/span&gt;&lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;years&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;December 31, 2019&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98F_ecustom--RiskadjustmentAssessmentOfAchievingMilestone_pid_dp_c20190101__20191231_z5cHHwdO0F3a" style="text-align: right" title="Risk-adjustment Assessment of achieving each Milestone"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;80&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;%&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98D_ecustom--DiscountRatesOnMileStoneLiabilities_pid_dp_c20190101__20191231_zD0krJglEmxi" style="text-align: right" title="Discount Rate"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;9&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;%&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: right"&gt;&lt;span id="xdx_909_ecustom--EstimatedTimeToAchieveMileStone_dtY_c20190101__20191231__srt--RangeAxis__srt--MinimumMember_zytePsubsX1c" style="font-family: Times New Roman, Times, Serif"&gt;1.12
    &lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;to &lt;span id="xdx_908_ecustom--EstimatedTimeToAchieveMileStone_dtY_c20190101__20191231__srt--RangeAxis__srt--MaximumMember_z1S7SwBwmHdi"&gt;2.12
    &lt;/span&gt;&lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;years&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;

&lt;p id="xdx_8A4_zqKPVn7iWL7c" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;&#160;&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;




&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;&#160;&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;

</CLSN:EarnoutMilestoneLiabilityDisclosureTextBlock>
    <CLSN:EarnoutMilestoneLiability1
      contextRef="AsOf2019-03-28_custom_AmendedAssetPurchaseAgreementMember_custom_AchievingMilestoneWithInOneYearMember"
      decimals="-5"
      unitRef="USD">12400000</CLSN:EarnoutMilestoneLiability1>
    <CLSN:EarnoutMilestoneLiability1
      contextRef="AsOf2019-03-28_custom_AmendedAssetPurchaseAgreementMember_custom_CertainBusinessDaysOfAchievingMilestoneMember"
      decimals="-5"
      unitRef="USD">7000000.0</CLSN:EarnoutMilestoneLiability1>
    <CLSN:EarnoutMilestoneLiability1
      contextRef="AsOf2019-03-28_custom_AmendedAssetPurchaseAgreementMember"
      decimals="-5"
      unitRef="USD">12400000</CLSN:EarnoutMilestoneLiability1>
    <us-gaap:BusinessCombinationConsiderationTransferredLiabilitiesIncurred
      contextRef="From2021-01-012021-06-30_custom_EGWCMember_custom_FairValueEarnoutMilestoneLiabilityMember"
      decimals="-5"
      unitRef="USD">7100000</us-gaap:BusinessCombinationConsiderationTransferredLiabilitiesIncurred>
    <us-gaap:BusinessCombinationConsiderationTransferredLiabilitiesIncurred
      contextRef="From2021-01-012021-03-31_custom_EGWCMember_custom_FairValueEarnoutMilestoneLiabilityMember"
      decimals="-5"
      unitRef="USD">7200000</us-gaap:BusinessCombinationConsiderationTransferredLiabilitiesIncurred>
    <us-gaap:BusinessCombinationConsiderationTransferredLiabilitiesIncurred
      contextRef="From2020-01-012020-12-31_custom_EGWCMember_custom_FairValueEarnoutMilestoneLiabilityMember"
      decimals="-5"
      unitRef="USD">7000000.0</us-gaap:BusinessCombinationConsiderationTransferredLiabilitiesIncurred>
    <CLSN:NoncashChargeOnEarnoutMilestoneLiability
      contextRef="From2021-04-012021-06-30_custom_EGWCMember"
      decimals="-5"
      unitRef="USD">100000</CLSN:NoncashChargeOnEarnoutMilestoneLiability>
    <CLSN:NoncashChargeOnEarnoutMilestoneLiability
      contextRef="From2021-01-012021-06-30_custom_EGWCMember"
      decimals="-5"
      unitRef="USD">100000</CLSN:NoncashChargeOnEarnoutMilestoneLiability>
    <CLSN:EarnoutPaymentOptionsDescription contextRef="From2021-01-012021-06-30_custom_EGWCMember">In
assessing the earnout milestone liability at June 30, 2021 and March 31, 2021, the Company fair valued each of the two payment options
per the Amended Asset Purchase Agreement and weighted them at 50% / 50% probability for the $7.0 million and the $12.4 million payments,
respectively.</CLSN:EarnoutPaymentOptionsDescription>
    <us-gaap:BusinessCombinationConsiderationTransferredLiabilitiesIncurred
      contextRef="From2020-01-012020-06-30_custom_EGWCMember_custom_FairValueEarnoutMilestoneLiabilityMember"
      decimals="-5"
      unitRef="USD">6000000.0</us-gaap:BusinessCombinationConsiderationTransferredLiabilitiesIncurred>
    <us-gaap:BusinessCombinationConsiderationTransferredLiabilitiesIncurred
      contextRef="From2020-01-012020-03-31_custom_EGWCMember_custom_FairValueEarnoutMilestoneLiabilityMember"
      decimals="-5"
      unitRef="USD">5800000</us-gaap:BusinessCombinationConsiderationTransferredLiabilitiesIncurred>
    <us-gaap:BusinessCombinationConsiderationTransferredLiabilitiesIncurred
      contextRef="From2019-01-012019-12-31_custom_EGWCMember_custom_FairValueEarnoutMilestoneLiabilityMember"
      decimals="-5"
      unitRef="USD">5700000</us-gaap:BusinessCombinationConsiderationTransferredLiabilitiesIncurred>
    <CLSN:NoncashChargeOnEarnoutMilestoneLiability
      contextRef="From2020-04-012020-06-30_custom_EGWCMember"
      decimals="-5"
      unitRef="USD">200000</CLSN:NoncashChargeOnEarnoutMilestoneLiability>
    <CLSN:NoncashChargeOnEarnoutMilestoneLiability
      contextRef="From2020-01-012020-06-30_custom_EGWCMember"
      decimals="-5"
      unitRef="USD">300000</CLSN:NoncashChargeOnEarnoutMilestoneLiability>
    <CLSN:EarnoutPaymentOptionsDescription contextRef="From2020-01-012020-06-30_custom_EGWCMember">In
assessing the earnout milestone liability at June 30, 2020 and March 31, 2020, the Company fair valued each of the two payment options
per the Amended Asset Purchase Agreement and weighted them at 80% / 20% probability for the $7.0 million and the $12.4 million
payments, respectively.</CLSN:EarnoutPaymentOptionsDescription>
    <CLSN:ScheduleOfChangesInEarnOutMilestoneLiabilitiesTableTextBlock contextRef="From2021-01-01to2021-06-30">&lt;p id="xdx_896_ecustom--ScheduleOfChangesInEarnOutMilestoneLiabilitiesTableTextBlock_zg2vwNiSH1K5" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;The
following is a summary of the changes in the earn-out milestone liability for the six-month period ended June 30, 2021:&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;span id="xdx_8B2_z8jvCwx4n2j5" style="display: none"&gt;Schedule
of Changes in Earn-out Milestone Liability&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%"&gt;
  &lt;tr style="display: none; vertical-align: bottom; background-color: White"&gt;
    &lt;td style="display: none; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="display: none"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="display: none; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="display: none; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="display: none; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="width: 80%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Balance at January 1, 2021&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_981_ecustom--EarnoutMilestoneLiability_iS_pp0p0_c20210101__20210630_zfgHFwac9LC5" style="width: 16%; text-align: right" title="Earn-out liabilities, beginning balance"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;(7,018,000&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;)&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Non-cash loss from the
    change in fair value&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98A_ecustom--GainLossFromChangeInFairValueOfEarnOutMilestoneLiability_c20210101__20210630_pp0p0" style="border-bottom: Black 1.5pt solid; text-align: right" title="Non-cash gain loss from the adjustment for the change in fair value"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;(70,000&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;)&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Balance at June 30, 2021&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98A_ecustom--EarnoutMilestoneLiability_iE_pp0p0_c20210101__20210630_zF3silNymLdi" style="border-bottom: Black 2.5pt double; text-align: right" title="Earn-out liabilities, ending balance"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;(7,088,000&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;)&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;

</CLSN:ScheduleOfChangesInEarnOutMilestoneLiabilitiesTableTextBlock>
    <CLSN:EarnoutMilestoneLiability contextRef="AsOf2020-12-31" decimals="0" unitRef="USD">-7018000</CLSN:EarnoutMilestoneLiability>
    <CLSN:GainLossFromChangeInFairValueOfEarnOutMilestoneLiability
      contextRef="From2021-01-01to2021-06-30"
      decimals="0"
      unitRef="USD">-70000</CLSN:GainLossFromChangeInFairValueOfEarnOutMilestoneLiability>
    <CLSN:EarnoutMilestoneLiability contextRef="AsOf2021-06-30" decimals="0" unitRef="USD">-7088000</CLSN:EarnoutMilestoneLiability>
    <CLSN:ScheduleOfRiskadjustmentAssessmentTableTextBlock contextRef="From2021-01-01to2021-06-30">&lt;p id="xdx_898_ecustom--ScheduleOfRiskadjustmentAssessmentTableTextBlock_zO1NEdKx5kH" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;The
following is a schedule of the Company&#x2019;s risk-adjustment assessment of each milestone:&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;span id="xdx_8BD_zLRJ6Thwwb7i" style="display: none"&gt;Schedule
of Risk Adjustment Assessment&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%"&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Date&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"&gt;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Risk-adjustment
                                            Assessment&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;of
                                            Achieving Each Milestone&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Discount
    Rate&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: center"&gt;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Estimated
                                            Time&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;to
                                            Achieve&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td style="text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: center"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="width: 44%; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;June 30, 2021&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98C_ecustom--RiskadjustmentAssessmentOfAchievingMilestone_pid_dp_c20210101__20210630_ztRZNKc1f1I" style="width: 13%; text-align: right" title="Risk-adjustment Assessment of achieving each Milestone"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;80&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;%&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_983_ecustom--DiscountRatesOnMileStoneLiabilities_pid_dp_c20210101__20210630_ztDD9dRCkHqj" style="width: 13%; text-align: right" title="Discount Rate"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;9&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;%&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="width: 20%; text-align: right"&gt;&lt;span id="xdx_90B_ecustom--EstimatedTimeToAchieveMileStone_dtY_c20210101__20210630__srt--RangeAxis__srt--MinimumMember_ztCH7vWA4Fdg" style="font-family: Times New Roman, Times, Serif"&gt;0.42
    &lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;to &lt;span id="xdx_906_ecustom--EstimatedTimeToAchieveMileStone_dtY_c20210101__20210630__srt--RangeAxis__srt--MaximumMember_zevrFDAxNcCi"&gt;1.42
    &lt;/span&gt;&lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;years&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;March 31, 2021&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98A_ecustom--RiskadjustmentAssessmentOfAchievingMilestone_pid_dp_c20210101__20210331_zY1Iv8PYEvyc" style="text-align: right" title="Risk-adjustment Assessment of achieving each Milestone"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;80&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;%&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98D_ecustom--DiscountRatesOnMileStoneLiabilities_pid_dp_c20210101__20210331_zvh5TKmdNpp1" style="text-align: right" title="Discount Rate"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;9&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;%&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: right"&gt;&lt;span id="xdx_907_ecustom--EstimatedTimeToAchieveMileStone_dtY_c20210101__20210331__srt--RangeAxis__srt--MinimumMember_z2v5sX2fdw75" style="font-family: Times New Roman, Times, Serif"&gt;0.29
    &lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;to &lt;span id="xdx_901_ecustom--EstimatedTimeToAchieveMileStone_dtY_c20210101__20210331__srt--RangeAxis__srt--MaximumMember_zv6kYZh3KWK1"&gt;1.29
    &lt;/span&gt;&lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;years&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;December 31, 2020&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_982_ecustom--RiskadjustmentAssessmentOfAchievingMilestone_pid_dp_c20200101__20201231_zmiycbmZaiel" style="text-align: right" title="Risk-adjustment Assessment of achieving each Milestone"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;80&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;%&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_980_ecustom--DiscountRatesOnMileStoneLiabilities_pid_dp_c20200101__20201231_zuXh5ODTXFGg" style="text-align: right" title="Discount Rate"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;9&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;%&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: right"&gt;&lt;span id="xdx_90C_ecustom--EstimatedTimeToAchieveMileStone_dtY_c20200101__20201231__srt--RangeAxis__srt--MinimumMember_zmbUCcKbn2fb" style="font-family: Times New Roman, Times, Serif"&gt;0.54
    &lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;to &lt;span id="xdx_902_ecustom--EstimatedTimeToAchieveMileStone_dtY_c20200101__20201231__srt--RangeAxis__srt--MaximumMember_zmJM2FABs6Vf"&gt;1.54
    &lt;/span&gt;&lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;years&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;June 30, 2020&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_988_ecustom--RiskadjustmentAssessmentOfAchievingMilestone_pid_dp_c20200101__20200630_zGc1e3DNHwwj" style="text-align: right" title="Risk-adjustment Assessment of achieving each Milestone"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;80&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;%&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_983_ecustom--DiscountRatesOnMileStoneLiabilities_pid_dp_c20200101__20200630_zX0YcalEWrh7" style="text-align: right" title="Discount Rate"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;9&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;%&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: right"&gt;&lt;span id="xdx_90C_ecustom--EstimatedTimeToAchieveMileStone_dtY_c20200101__20200630__srt--RangeAxis__srt--MinimumMember_zt7tUOXUIJAf" style="font-family: Times New Roman, Times, Serif"&gt;0.54
    &lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;to &lt;span id="xdx_90C_ecustom--EstimatedTimeToAchieveMileStone_dtY_c20200101__20200630__srt--RangeAxis__srt--MaximumMember_zl8FIdnX8JR"&gt;1.54
    &lt;/span&gt;&lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;years&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;March 31, 2020&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98E_ecustom--RiskadjustmentAssessmentOfAchievingMilestone_pid_dp_c20200101__20200331_zM3RagkkzXQh" style="text-align: right" title="Risk-adjustment Assessment of achieving each Milestone"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;80&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;%&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98D_ecustom--DiscountRatesOnMileStoneLiabilities_pid_dp_c20200101__20200331_zSl9XdEFA8i8" style="text-align: right" title="Discount Rate"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;9&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;%&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: right"&gt;&lt;span id="xdx_903_ecustom--EstimatedTimeToAchieveMileStone_dtY_c20200101__20200331__srt--RangeAxis__srt--MinimumMember_zTxJcY5cbtB8" style="font-family: Times New Roman, Times, Serif"&gt;1.04
    &lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;to &lt;span id="xdx_904_ecustom--EstimatedTimeToAchieveMileStone_dtY_c20200101__20200331__srt--RangeAxis__srt--MaximumMember_zW6qWcQqJyWj"&gt;2.04
    &lt;/span&gt;&lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;years&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;December 31, 2019&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98F_ecustom--RiskadjustmentAssessmentOfAchievingMilestone_pid_dp_c20190101__20191231_z5cHHwdO0F3a" style="text-align: right" title="Risk-adjustment Assessment of achieving each Milestone"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;80&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;%&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98D_ecustom--DiscountRatesOnMileStoneLiabilities_pid_dp_c20190101__20191231_zD0krJglEmxi" style="text-align: right" title="Discount Rate"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;9&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;%&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: right"&gt;&lt;span id="xdx_909_ecustom--EstimatedTimeToAchieveMileStone_dtY_c20190101__20191231__srt--RangeAxis__srt--MinimumMember_zytePsubsX1c" style="font-family: Times New Roman, Times, Serif"&gt;1.12
    &lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;to &lt;span id="xdx_908_ecustom--EstimatedTimeToAchieveMileStone_dtY_c20190101__20191231__srt--RangeAxis__srt--MaximumMember_z1S7SwBwmHdi"&gt;2.12
    &lt;/span&gt;&lt;/span&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;years&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;

</CLSN:ScheduleOfRiskadjustmentAssessmentTableTextBlock>
    <CLSN:RiskadjustmentAssessmentOfAchievingMilestone
      contextRef="From2021-01-01to2021-06-30"
      decimals="INF"
      unitRef="Percentage">0.80</CLSN:RiskadjustmentAssessmentOfAchievingMilestone>
    <CLSN:DiscountRatesOnMileStoneLiabilities
      contextRef="From2021-01-01to2021-06-30"
      decimals="INF"
      unitRef="Percentage">0.09</CLSN:DiscountRatesOnMileStoneLiabilities>
    <CLSN:EstimatedTimeToAchieveMileStone contextRef="From2021-01-012021-06-30_srt_MinimumMember">P0Y5M1D</CLSN:EstimatedTimeToAchieveMileStone>
    <CLSN:EstimatedTimeToAchieveMileStone contextRef="From2021-01-012021-06-30_srt_MaximumMember">P1Y5M1D</CLSN:EstimatedTimeToAchieveMileStone>
    <CLSN:RiskadjustmentAssessmentOfAchievingMilestone
      contextRef="From2021-01-012021-03-31"
      decimals="INF"
      unitRef="Percentage">0.80</CLSN:RiskadjustmentAssessmentOfAchievingMilestone>
    <CLSN:DiscountRatesOnMileStoneLiabilities
      contextRef="From2021-01-012021-03-31"
      decimals="INF"
      unitRef="Percentage">0.09</CLSN:DiscountRatesOnMileStoneLiabilities>
    <CLSN:EstimatedTimeToAchieveMileStone contextRef="From2021-01-012021-03-31_srt_MinimumMember">P0Y3M14D</CLSN:EstimatedTimeToAchieveMileStone>
    <CLSN:EstimatedTimeToAchieveMileStone contextRef="From2021-01-012021-03-31_srt_MaximumMember">P1Y3M14D</CLSN:EstimatedTimeToAchieveMileStone>
    <CLSN:RiskadjustmentAssessmentOfAchievingMilestone
      contextRef="From2020-01-012020-12-31"
      decimals="INF"
      unitRef="Percentage">0.80</CLSN:RiskadjustmentAssessmentOfAchievingMilestone>
    <CLSN:DiscountRatesOnMileStoneLiabilities
      contextRef="From2020-01-012020-12-31"
      decimals="INF"
      unitRef="Percentage">0.09</CLSN:DiscountRatesOnMileStoneLiabilities>
    <CLSN:EstimatedTimeToAchieveMileStone contextRef="From2020-01-012020-12-31_srt_MinimumMember">P0Y6M14D</CLSN:EstimatedTimeToAchieveMileStone>
    <CLSN:EstimatedTimeToAchieveMileStone contextRef="From2020-01-012020-12-31_srt_MaximumMember">P1Y6M14D</CLSN:EstimatedTimeToAchieveMileStone>
    <CLSN:RiskadjustmentAssessmentOfAchievingMilestone
      contextRef="From2020-01-012020-06-30"
      decimals="INF"
      unitRef="Percentage">0.80</CLSN:RiskadjustmentAssessmentOfAchievingMilestone>
    <CLSN:DiscountRatesOnMileStoneLiabilities
      contextRef="From2020-01-012020-06-30"
      decimals="INF"
      unitRef="Percentage">0.09</CLSN:DiscountRatesOnMileStoneLiabilities>
    <CLSN:EstimatedTimeToAchieveMileStone contextRef="From2020-01-012020-06-30_srt_MinimumMember">P0Y6M14D</CLSN:EstimatedTimeToAchieveMileStone>
    <CLSN:EstimatedTimeToAchieveMileStone contextRef="From2020-01-012020-06-30_srt_MaximumMember">P1Y6M14D</CLSN:EstimatedTimeToAchieveMileStone>
    <CLSN:RiskadjustmentAssessmentOfAchievingMilestone
      contextRef="From2020-01-012020-03-31"
      decimals="INF"
      unitRef="Percentage">0.80</CLSN:RiskadjustmentAssessmentOfAchievingMilestone>
    <CLSN:DiscountRatesOnMileStoneLiabilities
      contextRef="From2020-01-012020-03-31"
      decimals="INF"
      unitRef="Percentage">0.09</CLSN:DiscountRatesOnMileStoneLiabilities>
    <CLSN:EstimatedTimeToAchieveMileStone contextRef="From2020-01-012020-03-31_srt_MinimumMember">P1Y14D</CLSN:EstimatedTimeToAchieveMileStone>
    <CLSN:EstimatedTimeToAchieveMileStone contextRef="From2020-01-012020-03-31_srt_MaximumMember">P2Y14D</CLSN:EstimatedTimeToAchieveMileStone>
    <CLSN:RiskadjustmentAssessmentOfAchievingMilestone
      contextRef="From2019-01-012019-12-31"
      decimals="INF"
      unitRef="Percentage">0.80</CLSN:RiskadjustmentAssessmentOfAchievingMilestone>
    <CLSN:DiscountRatesOnMileStoneLiabilities
      contextRef="From2019-01-012019-12-31"
      decimals="INF"
      unitRef="Percentage">0.09</CLSN:DiscountRatesOnMileStoneLiabilities>
    <CLSN:EstimatedTimeToAchieveMileStone contextRef="From2019-01-012019-12-31_srt_MinimumMember">P1Y1M13D</CLSN:EstimatedTimeToAchieveMileStone>
    <CLSN:EstimatedTimeToAchieveMileStone contextRef="From2019-01-012019-12-31_srt_MaximumMember">P2Y1M13D</CLSN:EstimatedTimeToAchieveMileStone>
    <CLSN:WarrantsTextBlock contextRef="From2021-01-01to2021-06-30">&lt;p id="xdx_80F_ecustom--WarrantsTextBlock_zf8qffPJ69p5" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Note
15. &lt;span id="xdx_820_zsC0SEq00lV8"&gt;Warrants&lt;/span&gt;&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p id="xdx_89A_eus-gaap--ScheduleOfStockholdersEquityNoteWarrantsOrRightsTextBlock_zyLOReG12MB1" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;Following
is a summary of all warrant activity for the six months ended June 30, 2021:&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;span id="xdx_8B5_zuNPNjGPNfbh" style="display: none"&gt;Summary
of Warrant Activity&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%"&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td style="border-bottom: Black 1.5pt solid"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Warrants&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"&gt;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Number
                                            of&lt;br/&gt; Warrants&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Issued&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"&gt;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Weighted&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Average&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Exercise
                                            Price&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="width: 60%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Warrants outstanding at December 31, 2020&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_981_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber_iS_c20210101__20210630_zAhiFozzRZib" style="width: 16%; text-align: right" title="Number of Warrants Issued, Warrants outstanding, Beginning balance"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;3,853,566&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_989_ecustom--ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingWeightedAverageExercisePrice_iS_c20210101__20210630_zqVVyHompmr8" style="width: 16%; text-align: right" title="Weighted Average Exercise Price, Warrants outstanding, Beginning balance"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;1.35&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Warrants exercised during the six
    months ended June 30, 2021 (see Note 12)&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98F_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised_iN_di_c20210101__20210630_zHPeBD6O7QY5" style="border-bottom: Black 1.5pt solid; text-align: right" title="Number of Warrants Issued, Warrants exercised"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;(1,216,667&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;)&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_988_ecustom--ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExerciseInPeriodWeightedAverageExercisePrice_c20210101__20210630_pdd" style="padding-bottom: 1.5pt; text-align: right" title="Weighted Average Exercise Price, Warrants exercised"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;1.24&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Warrants outstanding at June 30,
    2021&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98A_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber_iE_c20210101__20210630_zBZnYIt9d2i2" style="border-bottom: Black 2.5pt double; text-align: right" title="Number of Warrants Issued, Warrants outstanding, Ending balance"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;2,636,899&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98B_ecustom--ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingWeightedAverageExercisePrice_iE_c20210101__20210630_zHc7RRbT6gP6" style="padding-bottom: 2.5pt; text-align: right" title="Weighted Average Exercise Price, Warrants outstanding, Ending balance"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;1.40&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Aggregate intrinsic value of outstanding
    warrants at June 30, 2021&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98A_ecustom--ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionsOutstandingIntrinsicValue_iE_pp0p0_c20210101__20210630_zvgKs6wzw12k" style="border-bottom: Black 2.5pt double; text-align: right" title="Aggregate intrinsic value of outstanding warrants"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;159,857&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Weighted average remaining contractual terms at June 30, 2021&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span id="xdx_90E_ecustom--SharebasedCompensationArrangementBySharebasedPaymentAwardNonOptionsOutstandingWeightedAverageRemainingContractualTerm2_dtY_c20210101__20210630_ztBClSvcASZk" style="font: 10pt Times New Roman, Times, Serif"&gt;4.6
                                            &lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;years&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;

&lt;p id="xdx_8AC_zR7J2T3aIpdh" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

</CLSN:WarrantsTextBlock>
    <us-gaap:ScheduleOfStockholdersEquityNoteWarrantsOrRightsTextBlock contextRef="From2021-01-01to2021-06-30">&lt;p id="xdx_89A_eus-gaap--ScheduleOfStockholdersEquityNoteWarrantsOrRightsTextBlock_zyLOReG12MB1" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;Following
is a summary of all warrant activity for the six months ended June 30, 2021:&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;span id="xdx_8B5_zuNPNjGPNfbh" style="display: none"&gt;Summary
of Warrant Activity&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%"&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td style="border-bottom: Black 1.5pt solid"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Warrants&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"&gt;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Number
                                            of&lt;br/&gt; Warrants&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Issued&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"&gt;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Weighted&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Average&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Exercise
                                            Price&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="width: 60%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Warrants outstanding at December 31, 2020&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_981_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber_iS_c20210101__20210630_zAhiFozzRZib" style="width: 16%; text-align: right" title="Number of Warrants Issued, Warrants outstanding, Beginning balance"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;3,853,566&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_989_ecustom--ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingWeightedAverageExercisePrice_iS_c20210101__20210630_zqVVyHompmr8" style="width: 16%; text-align: right" title="Weighted Average Exercise Price, Warrants outstanding, Beginning balance"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;1.35&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Warrants exercised during the six
    months ended June 30, 2021 (see Note 12)&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98F_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised_iN_di_c20210101__20210630_zHPeBD6O7QY5" style="border-bottom: Black 1.5pt solid; text-align: right" title="Number of Warrants Issued, Warrants exercised"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;(1,216,667&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;)&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_988_ecustom--ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExerciseInPeriodWeightedAverageExercisePrice_c20210101__20210630_pdd" style="padding-bottom: 1.5pt; text-align: right" title="Weighted Average Exercise Price, Warrants exercised"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;1.24&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Warrants outstanding at June 30,
    2021&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98A_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber_iE_c20210101__20210630_zBZnYIt9d2i2" style="border-bottom: Black 2.5pt double; text-align: right" title="Number of Warrants Issued, Warrants outstanding, Ending balance"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;2,636,899&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98B_ecustom--ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingWeightedAverageExercisePrice_iE_c20210101__20210630_zHc7RRbT6gP6" style="padding-bottom: 2.5pt; text-align: right" title="Weighted Average Exercise Price, Warrants outstanding, Ending balance"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;1.40&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Aggregate intrinsic value of outstanding
    warrants at June 30, 2021&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td id="xdx_98A_ecustom--ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionsOutstandingIntrinsicValue_iE_pp0p0_c20210101__20210630_zvgKs6wzw12k" style="border-bottom: Black 2.5pt double; text-align: right" title="Aggregate intrinsic value of outstanding warrants"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;159,857&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Weighted average remaining contractual terms at June 30, 2021&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span id="xdx_90E_ecustom--SharebasedCompensationArrangementBySharebasedPaymentAwardNonOptionsOutstandingWeightedAverageRemainingContractualTerm2_dtY_c20210101__20210630_ztBClSvcASZk" style="font: 10pt Times New Roman, Times, Serif"&gt;4.6
                                            &lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;years&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;

</us-gaap:ScheduleOfStockholdersEquityNoteWarrantsOrRightsTextBlock>
    <us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber contextRef="AsOf2020-12-31" decimals="INF" unitRef="Shares">3853566</us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber>
    <CLSN:ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingWeightedAverageExercisePrice
      contextRef="AsOf2020-12-31"
      decimals="INF"
      unitRef="USDPShares">1.35</CLSN:ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingWeightedAverageExercisePrice>
    <us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised
      contextRef="From2021-01-01to2021-06-30"
      decimals="INF"
      unitRef="Shares">1216667</us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised>
    <CLSN:ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExerciseInPeriodWeightedAverageExercisePrice
      contextRef="From2021-01-01to2021-06-30"
      decimals="INF"
      unitRef="USDPShares">1.24</CLSN:ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExerciseInPeriodWeightedAverageExercisePrice>
    <us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber contextRef="AsOf2021-06-30" decimals="INF" unitRef="Shares">2636899</us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber>
    <CLSN:ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingWeightedAverageExercisePrice
      contextRef="AsOf2021-06-30"
      decimals="INF"
      unitRef="USDPShares">1.40</CLSN:ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingWeightedAverageExercisePrice>
    <CLSN:ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionsOutstandingIntrinsicValue contextRef="AsOf2021-06-30" decimals="0" unitRef="USD">159857</CLSN:ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionsOutstandingIntrinsicValue>
    <CLSN:SharebasedCompensationArrangementBySharebasedPaymentAwardNonOptionsOutstandingWeightedAverageRemainingContractualTerm2 contextRef="From2021-01-01to2021-06-30">P4Y7M6D</CLSN:SharebasedCompensationArrangementBySharebasedPaymentAwardNonOptionsOutstandingWeightedAverageRemainingContractualTerm2>
    <us-gaap:LesseeOperatingLeasesTextBlock contextRef="From2021-01-01to2021-06-30">&lt;p id="xdx_803_eus-gaap--LesseeOperatingLeasesTextBlock_z9DkxzCfoEOl" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Note
16. &lt;span id="xdx_823_zMZbPyAA0R7j"&gt;Leases&lt;/span&gt;&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span id="xdx_908_eus-gaap--LesseeOperatingLeaseDescription_c20110701__20110731" style="font: 10pt Times New Roman, Times, Serif"&gt;In
2011, the Company executed a lease (the &#x201c;Lease&#x201d;) with Brandywine Operating Partnership, L.P. (Brandywine), a Delaware
limited partnership, for a &lt;/span&gt;&lt;span id="xdx_904_eus-gaap--AreaOfLand_iI_uSqft_c20110731_zBXAAeWbCo04" style="font: 10pt Times New Roman, Times, Serif"&gt;10,870
square foot premises located in Lawrenceville, New Jersey and relocated its offices to Lawrenceville, New Jersey from Columbia,
Maryland. The Lease had an initial term of &lt;/span&gt;&lt;span id="xdx_900_eus-gaap--LesseeOperatingLeaseTermOfContract_iI_dtM_c20110731_zRZ2AjYuutEl" style="font: 10pt Times New Roman, Times, Serif"&gt;66 &lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;months.
In late 2015, Lenox Drive Office Park LLC purchased the real estate and office building and assumed the Lease. This Lease was set to
expire on &lt;span id="xdx_903_eus-gaap--LeaseExpirationDate1_dd_c20110701__20110731_zMDe2EcMKkyc"&gt;April 30, 2017&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;.
In April 2017, the Company and the landlord amended the Lease effective May 1, 2017. The 1&lt;sup&gt;st&lt;/sup&gt; Lease Amendment extended the
term of the agreement for an additional 64 months, reduced the premises to 7,565 square feet, reduced the monthly rent and provided
four months free rent. The monthly rent ranged from approximately $&lt;span id="xdx_90D_eus-gaap--PaymentsForRent_c20210101__20210630__us-gaap--TypeOfArrangementAxis__custom--FirstLeaseAmendmentMember__us-gaap--AwardTypeAxis__custom--FirstYearMember_pp0p0"&gt;18,900 &lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;in
the first year to approximately $&lt;span id="xdx_901_eus-gaap--PaymentsForRent_c20210101__20210630__us-gaap--TypeOfArrangementAxis__custom--FirstLeaseAmendmentMember__us-gaap--AwardTypeAxis__custom--FinalYearMember_pp0p0"&gt;20,500 &lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;in
the final year of the 1&lt;sup&gt;st&lt;/sup&gt; Lease Amendment. Effective January 9, 2019, the Company amended the current terms of the
1&lt;sup&gt;st&lt;/sup&gt; Lease Amendment to increase the size of the premises by 2,285 square feet to 9,850 square feet and also extended the
lease term by one year to September 1, 2023. The monthly rent ranges from approximately $&lt;span id="xdx_90C_eus-gaap--PaymentsForRent_c20210101__20210630__us-gaap--TypeOfArrangementAxis__custom--SecondLeaseAmendmentMember__us-gaap--AwardTypeAxis__custom--FirstYearMember_pp0p0"&gt;25,035 &lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;in
the first year to approximately $&lt;span id="xdx_908_eus-gaap--PaymentsForRent_c20210101__20210630__us-gaap--TypeOfArrangementAxis__custom--SecondLeaseAmendmentMember__us-gaap--AwardTypeAxis__custom--FinalYearMember_pp0p0"&gt;27,088 &lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;in
the final year of the 2&lt;sup&gt;nd&lt;/sup&gt; Lease Amendment.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span id="xdx_907_eus-gaap--LesseeOperatingLeaseDescription_c20180101__20180131__us-gaap--TypeOfArrangementAxis__custom--EGENAssetPurchaseAgreementMember" style="font: 10pt Times New Roman, Times, Serif"&gt;In
connection with the EGEN Asset Purchase Agreement in June 2014, the Company assumed the existing lease with another landlord for an &lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span id="xdx_904_eus-gaap--AreaOfLand_iI_uSqft_c20201231__srt--StatementGeographicalAxis__custom--HuntsvilleAlabamaMember_z9VwuUYmSqsc"&gt;11,500&lt;/span&gt;
square foot premises located in Huntsville Alabama. In January 2018, the Company and the Huntsville landlord entered into a new
60-month lease which reduced the premises to 9,049 square feet with rent payments of approximately $&lt;/span&gt;&lt;span id="xdx_90F_eus-gaap--PaymentsForRent_c20180101__20180131__us-gaap--TypeOfArrangementAxis__custom--EGENAssetPurchaseAgreementMember_pp0p0" style="font: 10pt Times New Roman, Times, Serif"&gt;18,100
per month.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;We
adopted ASC Topic 842 on January 1, 2019 using the modified retrospective transition method for all lease arrangements at the beginning
of the period of adoption. Results for reporting periods beginning January 1, 2019 are presented under ASC 842, while prior period amounts
were not adjusted and continue to be reported in accordance with our historic accounting under Topic 840, Leases. The standard had a
material impact on our Condensed Consolidated Balance Sheet but had no impact on our condensed consolidated net earnings and cash flows.
The most significant impact of adopting ASC Topic 842 was the recognition of the right-of-use (ROU) asset and lease liabilities for operating
leases, which are presented in the following three-line items on the Consolidated Condensed Balance Sheet: (i) operating lease right-of-use
asset; (ii) current operating lease liabilities; and (iii) operating lease liabilities. Therefore, on date of adoption of ASC Topic 842,
the Company recognized a ROU asset of $&lt;span id="xdx_90C_eus-gaap--OperatingLeaseRightOfUseAsset_iI_pn5n6_c20190102__us-gaap--AdjustmentsForNewAccountingPronouncementsAxis__us-gaap--AccountingStandardsUpdate201602Member_zEM04KJrnLI6"&gt;1.4
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;million, operating lease liabilities, current
and non-current collectively, of $&lt;span id="xdx_90A_eus-gaap--OperatingLeaseLiability_iI_pn5n6_c20190102__us-gaap--AdjustmentsForNewAccountingPronouncementsAxis__us-gaap--AccountingStandardsUpdate201602Member_zZKWm4rGCLUd"&gt;1.5
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;million and reduced other liabilities by approximately
$&lt;span id="xdx_909_eus-gaap--OtherLiabilities_iI_pn5n6_c20190102__us-gaap--AdjustmentsForNewAccountingPronouncementsAxis__us-gaap--AccountingStandardsUpdate201602Member_zNFw1wNi5JNa"&gt;0.1
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;million. We elected the package of practical
expedients for leases that commenced before the effective date of ASC Topic 842 whereby we elected to not reassess the following: (i)
whether any expired or existing contracts contain leases; (ii) the lease classification for any expired or existing leases; and (iii)
initial direct costs for any existing leases. In addition, we have lease agreements with lease and non-lease components, and we have
elected the practical expedient for all underlying asset classes and account for them as a single lease component. We have no finance
leases. We determine if an arrangement is a lease at inception. We have operating leases for office space and research and development
facilities. Neither of our leases include options to renew, however, one contains an option for early termination. We considered the
option of early termination in measurement of right-of-use assets and lease liabilities and we determined it is not reasonably certain
to be terminated. In connection with the 2&lt;sup&gt;nd&lt;/sup&gt; Lease Amendment for the New Jersey office lease in January 2019, the Company
considered this as one modified lease and not as two separate leases. Therefore, in January 2019, the Company determined this lease was
an operating lease and remeasured the ROU asset and lease liability. Therefore, the Company increased the ROU asset and operating lease
liabilities by $&lt;span id="xdx_903_eus-gaap--OperatingLeaseRightOfUseAsset_iI_pn5n6_c20190102_zlH6INxpkBfh"&gt;0.4&lt;/span&gt;&lt;/span&gt; &lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;million
to $&lt;span id="xdx_90D_eus-gaap--RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability_pn5n6_c20181230__20190102_z7H2dtHkWFhg"&gt;1.8
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;million and $&lt;span id="xdx_904_eus-gaap--OperatingLeaseLiability_iI_pn5n6_c20190102_zi4Bxybj99Fe"&gt;1.9
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;million, respectively.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;




&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p id="xdx_890_eus-gaap--LesseeOperatingLeaseLiabilityMaturityTableTextBlock_z4RySOfHK1V8" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;Following
is a table of the lease payments and maturity of our operating lease liabilities as of June 30, 2021:&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;span id="xdx_8B7_zyKGaaw0an66" style="display: none"&gt;Schedule
of Lease Payments and Maturity of Operating Lease Liabilities&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%"&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" id="xdx_495_20210630_zE9yRm7JS5b1" style="border-bottom: Black 1.5pt solid; text-align: center"&gt;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;For
                                            the&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;year
                                            ending&lt;br/&gt; June 30,&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40C_eus-gaap--LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_iI_pp0p0_maLOLLPzRpH_zbZY95qxpQc5" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="text-align: left; width: 80%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Remainder of 2021&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 16%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;266,188&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_402_eus-gaap--LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_iI_pp0p0_maLOLLPzRpH_z06zh07qOhj9" style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;2022&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;535,579&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40B_eus-gaap--LesseeOperatingLeaseLiabilityPaymentsDueYearThree_iI_pp0p0_maLOLLPzRpH_zV55xrWo0Y9h" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;2023&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;233,116&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_409_ecustom--LesseeOperatingLeaseLiabilityPaymentsDueAfterYearThreeAndThereAfter_iI_pp0p0_maLOLLPzRpH_z8CQV3Hxu8o7" style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;2024 and thereafter&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl1316"&gt;&#160;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1.5pt solid; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;-&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40F_eus-gaap--LesseeOperatingLeaseLiabilityPaymentsDue_iTI_pp0p0_mtLOLLPzRpH_zxkN4KFxThYc" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Subtotal future lease payments&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;1,034,883&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_409_ecustom--OperatingLeaseImputedInterest_iNI_pp0p0_di_zxa1wWigBvZ1" style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="padding-left: 10pt; text-align: left; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Less
    imputed interest&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1.5pt solid; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;(101,664&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;)&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_404_eus-gaap--OperatingLeaseLiability_iI_pp0p0_zI5OOCubORAk" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="text-align: left; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Total lease liabilities&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1.5pt solid; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;933,219&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="text-align: left; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Weighted average remaining
    life&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1.5pt solid; text-align: right"&gt;&lt;span id="xdx_905_eus-gaap--OperatingLeaseWeightedAverageRemainingLeaseTerm1_iI_dtY_c20210630_zDfXmVicMJyg" style="font: 10pt Times New Roman, Times, Serif"&gt;2.0
                                            &lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;years&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="text-align: left; padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Weighted average discount
    rate&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; text-align: right"&gt;&lt;span id="xdx_90F_eus-gaap--OperatingLeaseWeightedAverageDiscountRatePercent_iI_pid_dp_c20210630_zcTGE2yTgdg2" style="font-family: Times New Roman, Times, Serif"&gt;9.98&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;%&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;

&lt;p id="xdx_8A1_zAGTiCFuhki3" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;For
the three-month and six-month periods ended June 30, 2021, operating lease expense was $&lt;span id="xdx_907_eus-gaap--OperatingLeaseCost_pp0p0_c20210401__20210630__us-gaap--TypeOfArrangementAxis__custom--OperatingLeasesMember_zGSiDGXz7GB4"&gt;130,595
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;and $&lt;span id="xdx_90A_eus-gaap--OperatingLeaseCost_pp0p0_c20210101__20210630__us-gaap--TypeOfArrangementAxis__custom--OperatingLeasesMember_zluoCzg0oAki"&gt;261,190&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;,
respectively and cash paid for operating leases included in operating cash flows was $&lt;span id="xdx_90B_eus-gaap--OperatingLeasePayments_pp0p0_c20210401__20210630__us-gaap--TypeOfArrangementAxis__custom--OperatingLeasesMember_zO3k0KyjPhJ4"&gt;132,684
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;and $&lt;span id="xdx_90D_eus-gaap--OperatingLeasePayments_pp0p0_c20210101__20210630__us-gaap--TypeOfArrangementAxis__custom--OperatingLeasesMember_zObdCU54sZtb"&gt;264,546&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;,
respectively. For the three-month and six-month periods ended June 30, 2020, operating lease expense was $&lt;span id="xdx_90A_eus-gaap--OperatingLeaseCost_pp0p0_c20200401__20200630__us-gaap--TypeOfArrangementAxis__custom--OperatingLeasesMember_zG5j5lJcByy8"&gt;130,595
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;and $&lt;span id="xdx_903_eus-gaap--OperatingLeaseCost_c20200101__20200630__us-gaap--TypeOfArrangementAxis__custom--OperatingLeasesMember_pp0p0"&gt;261,190&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;,
respectively and cash paid for operating leases included in operating cash flows was $&lt;span id="xdx_906_eus-gaap--OperatingLeasePayments_pp0p0_c20200401__20200630__us-gaap--TypeOfArrangementAxis__custom--OperatingLeasesMember_zwDlLDPXz3Ih"&gt;131,452
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;and $&lt;span id="xdx_90D_eus-gaap--OperatingLeasePayments_c20200101__20200630__us-gaap--TypeOfArrangementAxis__custom--OperatingLeasesMember_pp0p0"&gt;262,084&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;,
respectively.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

</us-gaap:LesseeOperatingLeasesTextBlock>
    <us-gaap:LesseeOperatingLeaseDescription contextRef="From2011-07-012011-07-31">In
2011, the Company executed a lease (the &#x201c;Lease&#x201d;) with Brandywine Operating Partnership, L.P. (Brandywine), a Delaware
limited partnership, for a</us-gaap:LesseeOperatingLeaseDescription>
    <us-gaap:AreaOfLand contextRef="AsOf2011-07-31" decimals="INF" unitRef="Sqft">10870</us-gaap:AreaOfLand>
    <us-gaap:LesseeOperatingLeaseTermOfContract contextRef="AsOf2011-07-31">P66M</us-gaap:LesseeOperatingLeaseTermOfContract>
    <us-gaap:LeaseExpirationDate1 contextRef="From2011-07-012011-07-31">2017-04-30</us-gaap:LeaseExpirationDate1>
    <us-gaap:PaymentsForRent
      contextRef="From2021-01-012021-06-30_custom_FirstLeaseAmendmentMember_custom_FirstYearMember"
      decimals="0"
      unitRef="USD">18900</us-gaap:PaymentsForRent>
    <us-gaap:PaymentsForRent
      contextRef="From2021-01-012021-06-30_custom_FirstLeaseAmendmentMember_custom_FinalYearMember"
      decimals="0"
      unitRef="USD">20500</us-gaap:PaymentsForRent>
    <us-gaap:PaymentsForRent
      contextRef="From2021-01-012021-06-30_custom_SecondLeaseAmendmentMember_custom_FirstYearMember"
      decimals="0"
      unitRef="USD">25035</us-gaap:PaymentsForRent>
    <us-gaap:PaymentsForRent
      contextRef="From2021-01-012021-06-30_custom_SecondLeaseAmendmentMember_custom_FinalYearMember"
      decimals="0"
      unitRef="USD">27088</us-gaap:PaymentsForRent>
    <us-gaap:LesseeOperatingLeaseDescription contextRef="From2018-01-012018-01-31_custom_EGENAssetPurchaseAgreementMember">In
connection with the EGEN Asset Purchase Agreement in June 2014, the Company assumed the existing lease with another landlord for an</us-gaap:LesseeOperatingLeaseDescription>
    <us-gaap:AreaOfLand
      contextRef="AsOf2020-12-31_custom_HuntsvilleAlabamaMember"
      decimals="INF"
      unitRef="Sqft">11500</us-gaap:AreaOfLand>
    <us-gaap:PaymentsForRent
      contextRef="From2018-01-012018-01-31_custom_EGENAssetPurchaseAgreementMember"
      decimals="0"
      unitRef="USD">18100</us-gaap:PaymentsForRent>
    <us-gaap:OperatingLeaseRightOfUseAsset
      contextRef="AsOf2019-01-02_us-gaap_AccountingStandardsUpdate201602Member"
      decimals="-5"
      unitRef="USD">1400000</us-gaap:OperatingLeaseRightOfUseAsset>
    <us-gaap:OperatingLeaseLiability
      contextRef="AsOf2019-01-02_us-gaap_AccountingStandardsUpdate201602Member"
      decimals="-5"
      unitRef="USD">1500000</us-gaap:OperatingLeaseLiability>
    <us-gaap:OtherLiabilities
      contextRef="AsOf2019-01-02_us-gaap_AccountingStandardsUpdate201602Member"
      decimals="-5"
      unitRef="USD">100000</us-gaap:OtherLiabilities>
    <us-gaap:OperatingLeaseRightOfUseAsset contextRef="AsOf2019-01-02" decimals="-5" unitRef="USD">400000</us-gaap:OperatingLeaseRightOfUseAsset>
    <us-gaap:RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability
      contextRef="From2018-12-302019-01-02"
      decimals="-5"
      unitRef="USD">1800000</us-gaap:RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability>
    <us-gaap:OperatingLeaseLiability contextRef="AsOf2019-01-02" decimals="-5" unitRef="USD">1900000</us-gaap:OperatingLeaseLiability>
    <us-gaap:LesseeOperatingLeaseLiabilityMaturityTableTextBlock contextRef="From2021-01-01to2021-06-30">&lt;p id="xdx_890_eus-gaap--LesseeOperatingLeaseLiabilityMaturityTableTextBlock_z4RySOfHK1V8" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;Following
is a table of the lease payments and maturity of our operating lease liabilities as of June 30, 2021:&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;span id="xdx_8B7_zyKGaaw0an66" style="display: none"&gt;Schedule
of Lease Payments and Maturity of Operating Lease Liabilities&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%"&gt;
  &lt;tr style="vertical-align: bottom"&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td colspan="2" id="xdx_495_20210630_zE9yRm7JS5b1" style="border-bottom: Black 1.5pt solid; text-align: center"&gt;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;For
                                            the&lt;/b&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;year
                                            ending&lt;br/&gt; June 30,&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40C_eus-gaap--LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_iI_pp0p0_maLOLLPzRpH_zbZY95qxpQc5" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="text-align: left; width: 80%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Remainder of 2021&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 2%"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 16%; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;266,188&lt;/span&gt;&lt;/td&gt;&lt;td style="width: 1%; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_402_eus-gaap--LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_iI_pp0p0_maLOLLPzRpH_z06zh07qOhj9" style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;2022&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;535,579&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40B_eus-gaap--LesseeOperatingLeaseLiabilityPaymentsDueYearThree_iI_pp0p0_maLOLLPzRpH_zV55xrWo0Y9h" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;2023&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;233,116&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_409_ecustom--LesseeOperatingLeaseLiabilityPaymentsDueAfterYearThreeAndThereAfter_iI_pp0p0_maLOLLPzRpH_z8CQV3Hxu8o7" style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;2024 and thereafter&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&lt;span style="-sec-ix-hidden: xdx2ixbrl1316"&gt;&#160;&lt;/span&gt;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1.5pt solid; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;-&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_40F_eus-gaap--LesseeOperatingLeaseLiabilityPaymentsDue_iTI_pp0p0_mtLOLLPzRpH_zxkN4KFxThYc" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Subtotal future lease payments&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;1,034,883&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_409_ecustom--OperatingLeaseImputedInterest_iNI_pp0p0_di_zxa1wWigBvZ1" style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="padding-left: 10pt; text-align: left; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Less
    imputed interest&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1.5pt solid; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;(101,664&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;)&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr id="xdx_404_eus-gaap--OperatingLeaseLiability_iI_pp0p0_zI5OOCubORAk" style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="text-align: left; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Total lease liabilities&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;$&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1.5pt solid; text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;933,219&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="text-align: left; padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Weighted average remaining
    life&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1.5pt solid; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1.5pt solid; text-align: right"&gt;&lt;span id="xdx_905_eus-gaap--OperatingLeaseWeightedAverageRemainingLeaseTerm1_iI_dtY_c20210630_zDfXmVicMJyg" style="font: 10pt Times New Roman, Times, Serif"&gt;2.0
                                            &lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;years&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: White"&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: right"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="vertical-align: bottom; background-color: rgb(204,238,255)"&gt;
    &lt;td style="text-align: left; padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;Weighted average discount
    rate&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 2.5pt double; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 2.5pt double; text-align: right"&gt;&lt;span id="xdx_90F_eus-gaap--OperatingLeaseWeightedAverageDiscountRatePercent_iI_pid_dp_c20210630_zcTGE2yTgdg2" style="font-family: Times New Roman, Times, Serif"&gt;9.98&lt;/span&gt;&lt;/td&gt;&lt;td style="padding-bottom: 2.5pt; text-align: left"&gt;&lt;span style="font-family: Times New Roman, Times, Serif"&gt;%&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;

</us-gaap:LesseeOperatingLeaseLiabilityMaturityTableTextBlock>
    <us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths contextRef="AsOf2021-06-30" decimals="0" unitRef="USD">266188</us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths>
    <us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo contextRef="AsOf2021-06-30" decimals="0" unitRef="USD">535579</us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo>
    <us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree contextRef="AsOf2021-06-30" decimals="0" unitRef="USD">233116</us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree>
    <us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue contextRef="AsOf2021-06-30" decimals="0" unitRef="USD">1034883</us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue>
    <CLSN:OperatingLeaseImputedInterest contextRef="AsOf2021-06-30" decimals="0" unitRef="USD">101664</CLSN:OperatingLeaseImputedInterest>
    <us-gaap:OperatingLeaseLiability contextRef="AsOf2021-06-30" decimals="0" unitRef="USD">933219</us-gaap:OperatingLeaseLiability>
    <us-gaap:OperatingLeaseWeightedAverageRemainingLeaseTerm1 contextRef="AsOf2021-06-30">P2Y</us-gaap:OperatingLeaseWeightedAverageRemainingLeaseTerm1>
    <us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent
      contextRef="AsOf2021-06-30"
      decimals="INF"
      unitRef="Percentage">0.0998</us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent>
    <us-gaap:OperatingLeaseCost
      contextRef="From2021-04-012021-06-30_custom_OperatingLeasesMember"
      decimals="0"
      unitRef="USD">130595</us-gaap:OperatingLeaseCost>
    <us-gaap:OperatingLeaseCost
      contextRef="From2021-01-012021-06-30_custom_OperatingLeasesMember"
      decimals="0"
      unitRef="USD">261190</us-gaap:OperatingLeaseCost>
    <us-gaap:OperatingLeasePayments
      contextRef="From2021-04-012021-06-30_custom_OperatingLeasesMember"
      decimals="0"
      unitRef="USD">132684</us-gaap:OperatingLeasePayments>
    <us-gaap:OperatingLeasePayments
      contextRef="From2021-01-012021-06-30_custom_OperatingLeasesMember"
      decimals="0"
      unitRef="USD">264546</us-gaap:OperatingLeasePayments>
    <us-gaap:OperatingLeaseCost
      contextRef="From2020-04-012020-06-30_custom_OperatingLeasesMember"
      decimals="0"
      unitRef="USD">130595</us-gaap:OperatingLeaseCost>
    <us-gaap:OperatingLeaseCost
      contextRef="From2020-01-012020-06-30_custom_OperatingLeasesMember"
      decimals="0"
      unitRef="USD">261190</us-gaap:OperatingLeaseCost>
    <us-gaap:OperatingLeasePayments
      contextRef="From2020-04-012020-06-30_custom_OperatingLeasesMember"
      decimals="0"
      unitRef="USD">131452</us-gaap:OperatingLeasePayments>
    <us-gaap:OperatingLeasePayments
      contextRef="From2020-01-012020-06-30_custom_OperatingLeasesMember"
      decimals="0"
      unitRef="USD">262084</us-gaap:OperatingLeasePayments>
    <CLSN:LicensingTransactionTextBlock contextRef="From2021-01-01to2021-06-30">&lt;p id="xdx_80D_ecustom--LicensingTransactionTextBlock_zO0A5bLZs45e" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Note
17. &lt;span id="xdx_828_zHhke97mWmbc"&gt;Technology Development and Licensing Agreements&lt;/span&gt;&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;On
May 7, 2012, the Company entered into a long-term commercial supply agreement with Zhejiang Hisun Pharmaceutical Co. Ltd. (Hisun) for
the production of ThermoDox&lt;sup&gt;&#xae;&lt;/sup&gt; in the China territory. In accordance with the terms of the agreement, Hisun will be responsible
for providing all of the technical and regulatory support services, including the costs of all technical transfer, registration and bioequivalence
studies, technical transfer costs, Celsion consultative support costs and the purchase of any necessary equipment and additional facility
costs necessary to support capacity requirements for the manufacture of ThermoDox&lt;sup&gt;&#xae;&lt;/sup&gt;. Celsion will repay Hisun for the aggregate
amount of these development costs and fees commencing on the successful completion of three registration batches of ThermoDox&lt;sup&gt;&#xae;&lt;/sup&gt;.
Hisun is also obligated to certain performance requirements under the agreement. The agreement will initially be limited to a percentage
of the production requirements of ThermoDox&lt;sup&gt;&#xae;&lt;/sup&gt; in the China territory with Hisun retaining an option for additional global
supply after local regulatory approval in the China territory. In addition, Hisun will collaborate with Celsion around the regulatory
approval activities for ThermoDox&lt;sup&gt;&#xae; &lt;/sup&gt;with the China State Food and Drug Administration (CHINA FDA). During the first quarter
of 2015, Hisun completed the successful manufacture of three registration batches of ThermoDox&lt;sup&gt;&#xae;&lt;/sup&gt;.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;On
January 18, 2013, we entered into a technology development contract with Hisun, pursuant to which Hisun paid us a non-refundable research
and development fee of $&lt;span id="xdx_900_eus-gaap--ProceedsFromLicenseFeesReceived_pn6n6_c20130117__20130118__us-gaap--AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis__custom--HisunMember_zTQp5y8IH3Bg"&gt;5
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;million to support our development of ThermoDox&lt;sup&gt;&#xae;
&lt;/sup&gt;in mainland China, Hong Kong and Macau (the China territory). Following our announcement on January 31, 2013 that the HEAT study
failed to meet its primary endpoint, Celsion and Hisun have agreed that the Technology Development Contract entered into on January 18,
2013 will remain in effect while the parties continue to collaborate and are evaluating the next steps in relation to ThermoDox&lt;sup&gt;&#xae;&lt;/sup&gt;,
which include the sub-group analysis of patients in the Phase III HEAT Study for the hepatocellular carcinoma clinical indication and
other activities to further the development of ThermoDox&lt;sup&gt;&#xae; &lt;/sup&gt;for the Greater China market. The $&lt;span id="xdx_904_eus-gaap--DeferredRevenue_iI_pn5n6_c20130118__us-gaap--AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis__custom--HisunMember_z8sj8b8g9WSh"&gt;5.0
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;million received as a non-refundable payment
from Hisun in the first quarter 2013 has been recorded to deferred revenue and will continue to be amortized over the &lt;span id="xdx_90E_ecustom--DeferredRevenueAmortizationPeriod_dtY_c20130117__20130118__us-gaap--AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis__custom--HisunMember_zo2O5Gnooo6f"&gt;10
&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;-year term of the agreement, until such time
as the parties find a mutually acceptable path forward on the development of ThermoDox&lt;sup&gt;&#xae;&lt;/sup&gt; based on findings of the ongoing
post-study analysis of the HEAT Study data.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;On
July 19, 2013, the Company and Hisun entered into a Memorandum of Understanding to pursue ongoing cooperation for the continued clinical
development of ThermoDox&lt;sup&gt;&#xae;&lt;/sup&gt; as well as the technology transfer relating to the commercial manufacture of ThermoDox&lt;sup&gt;&#xae;
&lt;/sup&gt;for the China territory. This expanded level of cooperation includes development of the next generation liposomal formulation with
the goal of creating safer, more efficacious versions of marketed cancer chemotherapeutics.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;Among
the key provisions of the Celsion-Hisun Memorandum of Understanding are:&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse"&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 0.5in; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;&#x25cf;&lt;/b&gt;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;Hisun
    will provide the Company with internal resources necessary to complete the technology transfer of the Company&#x2019;s proprietary
    manufacturing process and the production of registration batches for the China territory;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;&#x25cf;&lt;/b&gt;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;Hisun
    will coordinate with the Company around the clinical and regulatory approval activities for ThermoDox&lt;sup&gt;&#xae;&lt;/sup&gt; as well as
    other liposomal formations with the CHINA FDA; and&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;&#x25cf;&lt;/b&gt;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;Hisun
    will be granted a right of &lt;i&gt;first&lt;/i&gt; offer for a commercial license to ThermoDox&lt;sup&gt;&#xae;&lt;/sup&gt; for the sale and distribution
    of ThermoDox&lt;sup&gt;&#xae; &lt;/sup&gt;in the China territory.&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;
&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;




&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;On
August 8, 2016, we signed a Technology Transfer, Manufacturing and Commercial Supply Agreement (&#x201c;GEN-1 Agreement&#x201d;) with Hisun
to pursue an expanded partnership for the technology transfer relating to the clinical and commercial manufacture and supply of GEN-1,
Celsion&#x2019;s proprietary gene mediated, IL-12 immunotherapy, for the greater China territory, with the option to expand into other
countries in the rest of the world after all necessary regulatory approvals are in effect. The GEN-1 Agreement will help to support supply
for both ongoing and planned clinical studies in the U.S., and for potential future studies of GEN-1 in China. GEN-1 is currently being
evaluated by Celsion in first line ovarian cancer patients.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;Key
provisions of the GEN-1 Agreement are as follows:&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 9.9pt"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse"&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 0.5in"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;&#x25cf;&lt;/b&gt;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;the
    GEN-1 Agreement has targeted unit costs for clinical supplies of GEN-1 that are substantially competitive with the Company&#x2019;s
    current suppliers;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;&#x25cf;&lt;/b&gt;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;once
    approved, the cost structure for GEN-1 will support rapid market adoption and significant gross margins across global markets;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;&#x25cf;&lt;/b&gt;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;Celsion
    will provide Hisun a certain percentage of China&#x2019;s commercial unit demand, and separately of global commercial unit demand,
    subject to regulatory approval;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;&#x25cf;&lt;/b&gt;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;Hisun
    and Celsion will commence technology transfer activities relating to the manufacture of GEN-1, including all studies required by
    CHINA FDA for site approval; and&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;&#x25cf;&lt;/b&gt;&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;Hisun
    will collaborate with Celsion around the regulatory approval activities for GEN-1 with the CHINA FDA. A local China partner affords
    Celsion access to accelerated CHINA FDA review and potential regulatory exclusivity for the approved indication.&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;
&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;The
Company evaluated the Hisun arrangement in accordance with ASC 606 and determined that its performance obligations under the agreement
include the non-exclusive, royalty-free license, research and development services to be provided by the Company, and its obligation
to serve on a joint committee. The Company concluded that the license was not distinct since its value is closely tied to the ongoing
research and development activities. As such, the license and the research and development services are bundled as a single performance
obligation. Since the provision of the license and research and development services are considered a single performance obligation,
the $&lt;span id="xdx_900_ecustom--UpfrontPaymentBeingRecognized_c20210101__20210630_pp0p0"&gt;5,000,000&lt;/span&gt;&lt;/span&gt; &lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;upfront
payment is being recognized as revenue ratably through 2022.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

</CLSN:LicensingTransactionTextBlock>
    <us-gaap:ProceedsFromLicenseFeesReceived
      contextRef="From2013-01-172013-01-18_custom_HisunMember"
      decimals="-6"
      unitRef="USD">5000000</us-gaap:ProceedsFromLicenseFeesReceived>
    <us-gaap:DeferredRevenue
      contextRef="AsOf2013-01-18_custom_HisunMember"
      decimals="-5"
      unitRef="USD">5000000.0</us-gaap:DeferredRevenue>
    <CLSN:DeferredRevenueAmortizationPeriod contextRef="From2013-01-172013-01-18_custom_HisunMember">P10Y</CLSN:DeferredRevenueAmortizationPeriod>
    <CLSN:UpfrontPaymentBeingRecognized
      contextRef="From2021-01-01to2021-06-30"
      decimals="0"
      unitRef="USD">5000000</CLSN:UpfrontPaymentBeingRecognized>
    <us-gaap:CommitmentsAndContingenciesDisclosureTextBlock contextRef="From2021-01-01to2021-06-30">&lt;p id="xdx_80A_eus-gaap--CommitmentsAndContingenciesDisclosureTextBlock_zq4ODTqpkxA7" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Note
18. &lt;span id="xdx_828_zf71VXYqeqia"&gt;Commitments and Contingencies&lt;/span&gt;&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;On
September 20, 2019, a purported stockholder of the Company filed a derivative and putative class action lawsuit against the Company and
certain officers and directors (the &#x201c;Shareholder Action&#x201d;). The Company was a defendant in this derivative and putative class
action lawsuit in the Superior Court of New Jersey, Chancery Division, filed by a shareholder against the Company (as both a class action
defendant and nominal defendant), and certain of its officers and directors (the &#x201c;Individual Defendants&#x201d;), with the caption
&lt;i&gt;O&#x2019;Connor v. Braun et al., Docket No. MER-C-000068-19&lt;/i&gt; (the &#x201c;Shareholder Action&#x201d;). The Shareholder Action alleged
breaches of the defendants&#x2019; fiduciary duties based on allegations that the defendants omitted or made improper statements when
seeking shareholder approval of the 2018 Stock Incentive Plan. The Shareholder Action sought, among other things, any damages sustained
by the Company as a result of the defendants&#x2019; alleged wrongdoing, a declaratory judgment against all defendants invalidating the
2018 Stock Incentive Plan and declaring any awards made under the Plan invalid, rescinded, and subject to disgorgement, an order disgorging
the equity awards granted to the Individual Defendants under the 2018 Stock Incentive Plan, and attorneys&#x2019; fees and costs.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;On
April 24, 2020, the Company, the Individual Defendants, and the plaintiff (the &#x201c;Parties&#x201d;) entered into a Settlement Agreement
and Release (the &#x201c;Settlement Agreement&#x201d;), which memorializes the terms of the Parties&#x2019; settlement of the Shareholder
Action (the &#x201c;Settlement&#x201d;). The Settlement calls for repricing of certain stock options and payment of plaintiff legal fees
of $&lt;span id="xdx_90B_eus-gaap--LitigationSettlementExpense_c20200422__20200424_pp0p0"&gt;187,500&lt;/span&gt;&lt;/span&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;.
On July 24, 2020, the Court issued an order approving the Parties&#x2019; proposed form of notice to shareholders regarding the Settlement.
A hearing was held on September 8, 2020 whereby the Court issued a final approval approving the Settlement. Pursuant to the Settlement,
the Company paid $&lt;span id="xdx_90E_eus-gaap--PaymentsForLegalSettlements_c20201001__20201002_pp0p0"&gt;187,500&lt;/span&gt;&lt;/span&gt; &lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;on
October 1, 2020. Without admitting the validity of any of the claims asserted in the Shareholder Action, or any liability with respect
thereto, and expressly denying all allegations of wrongdoing, fault, liability, or damage against the Company and the Individual Defendants
arising out of any of the conduct, statements, acts or omissions alleged, or that could have been alleged, in the Shareholder Action,
the Company and the Individual Defendants concluded that it was desirable that the claims be settled on the terms and subject to the
conditions set forth in the Settlement Agreement. The Company and the Individual Defendants entered into the Settlement Agreement for
settlement purposes only and solely to avoid the cost and disruption of further litigation.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;On
October 29, 2020, a putative securities class action was filed against the Company and certain of its officers and directors (the &#x201c;Spar
Individual Defendants&#x201d;) in the U.S. District Court for the District of New Jersey, captioned &lt;i&gt;Spar v. Celsion Corporation, et
al.&lt;/i&gt;, Case No. 1:20-cv-15228. The plaintiff alleges that the Company and Individual Defendants made false and misleading statements
regarding one of the Company&#x2019;s product candidates, ThermoDox&lt;sup&gt;&#xae;&lt;/sup&gt;, and brings claims for damages under Section 10(b)
of the Exchange Act and Rule 10b-5 promulgated thereunder against all Defendants, and under Section 20(a) of the Exchange Act of 1934
against the Spar Individual Defendants. The Company believes that the case is without merit and intends to defend it vigorously. Due
to the early stage of the case neither the likelihood that a loss, if any, will be realized, nor an estimate of possible loss or range
of loss, if any, can be determined.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;&#160;&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;span style="font: 10pt Times New Roman, Times, Serif"&gt;In
February 2021, a derivative shareholder lawsuit was filed against the Company, as the nominal defendant, and certain of its directors
and officers as defendants in the U.S. District Court for the District of New Jersey, captioned &lt;i&gt;Fidler v. Michael H. Tardugno et al.&lt;/i&gt;,
Case No. 3:21-cv-02662. The plaintiff alleges breach of fiduciary duty and other claims arising out of alleged statements made by certain
of the Company&#x2019;s directors and/or officers regarding ThermoDox&lt;sup&gt;&#xae;.&lt;/sup&gt; The Company believes it has meritorious defenses
to these claims and intends to vigorously contest this suit. Due to the early stage of the case neither the likelihood that a loss, if
any, will be realized, nor an estimate of possible loss or range of loss, if any, can be determined.&lt;/span&gt;&lt;/p&gt;

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<span style="display: none;">v3.21.2</span><table class="report" border="0" cellspacing="2" id="idm140561288221992">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Cover - shares<br></strong></div></th>
<th class="th" colspan="1">6 Months Ended</th>
<th class="th" colspan="1"></th>
</tr>
<tr>
<th class="th"><div>Jun. 30, 2021</div></th>
<th class="th"><div>Aug. 11, 2021</div></th>
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<tr class="re">
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<td class="text">&#160;<span></span>
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<td class="text">&#160;<span></span>
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<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_DocumentType', window );">Document Type</a></td>
<td class="text">10-Q<span></span>
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<td class="text">&#160;<span></span>
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<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_AmendmentFlag', window );">Amendment Flag</a></td>
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<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_DocumentQuarterlyReport', window );">Document Quarterly Report</a></td>
<td class="text">true<span></span>
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<td class="text">&#160;<span></span>
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<td class="text">false<span></span>
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<td class="text">&#160;<span></span>
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<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_DocumentPeriodEndDate', window );">Document Period End Date</a></td>
<td class="text">Jun. 30,  2021<span></span>
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<td class="text">&#160;<span></span>
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<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_DocumentFiscalPeriodFocus', window );">Document Fiscal Period Focus</a></td>
<td class="text">Q2<span></span>
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<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_DocumentFiscalYearFocus', window );">Document Fiscal Year Focus</a></td>
<td class="text">2021<span></span>
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<tr class="re">
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<td class="text">&#160;<span></span>
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<tr class="ro">
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<td class="text">001-15911<span></span>
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<td class="text">&#160;<span></span>
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<tr class="re">
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<td class="text">&#160;<span></span>
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<td class="text">0000749647<span></span>
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<td class="text">&#160;<span></span>
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<td class="text">52-1256615<span></span>
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<td class="text">&#160;<span></span>
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<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityIncorporationStateCountryCode', window );">Entity Incorporation, State or Country Code</a></td>
<td class="text">DE<span></span>
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<td class="text">&#160;<span></span>
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<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityAddressAddressLine1', window );">Entity Address, Address Line One</a></td>
<td class="text">997 Lenox Drive<span></span>
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<td class="text">&#160;<span></span>
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<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityAddressAddressLine2', window );">Entity Address, Address Line Two</a></td>
<td class="text">Suite 100<span></span>
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<td class="text">&#160;<span></span>
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<td class="text">Lawrenceville<span></span>
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<td class="text">&#160;<span></span>
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<td class="text">NJ<span></span>
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<td class="text">&#160;<span></span>
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<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityAddressPostalZipCode', window );">Entity Address, Postal Zip Code</a></td>
<td class="text">08648<span></span>
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<td class="text">&#160;<span></span>
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<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_CityAreaCode', window );">City Area Code</a></td>
<td class="text">(609)<span></span>
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<td class="text">&#160;<span></span>
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<td class="text">&#160;<span></span>
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<td class="text">CLSN<span></span>
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<td class="text">&#160;<span></span>
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<td class="text">NASDAQ<span></span>
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<td class="text">&#160;<span></span>
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<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityCurrentReportingStatus', window );">Entity Current Reporting Status</a></td>
<td class="text">Yes<span></span>
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<td class="text">&#160;<span></span>
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<td class="text">Non-accelerated Filer<span></span>
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<td class="text">&#160;<span></span>
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<td class="text">true<span></span>
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<td class="text">false<span></span>
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<td class="text">&#160;<span></span>
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<td class="text">false<span></span>
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<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityCommonStockSharesOutstanding', window );">Entity Common Stock, Shares Outstanding</a></td>
<td class="text">&#160;<span></span>
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<td class="nump">86,557,736<span></span>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Boolean flag that is true when the XBRL content amends previously-filed or accepted submission.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>For the EDGAR submission types of Form 8-K: the date of the report, the date of the earliest event reported; for the EDGAR submission types of Form N-1A: the filing date; for all other submission types: the end of the reporting or transition period.  The format of the date is YYYY-MM-DD.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_DocumentQuarterlyReport">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Boolean flag that is true only for a form used as an quarterly report.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Form 10-Q<br> -Number 240<br> -Section 308<br> -Subsection a<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_DocumentQuarterlyReport</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:booleanItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_DocumentTransitionReport">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Boolean flag that is true only for a form used as a transition report.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Forms 10-K, 10-Q, 20-F<br> -Number 240<br> -Section 13<br> -Subsection a-1<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_DocumentTransitionReport</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:booleanItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_DocumentType">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The type of document being provided (such as 10-K, 10-Q, 485BPOS, etc). The document type is limited to the same value as the supporting SEC submission type, or the word 'Other'.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_DocumentType</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:submissionTypeItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityAddressAddressLine1">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Address Line 1 such as Attn, Building Name, Street Name</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityAddressAddressLine1</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:normalizedStringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityAddressAddressLine2">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Address Line 2 such as Street or Suite number</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityAddressAddressLine2</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:normalizedStringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityAddressCityOrTown">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Name of the City or Town</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityAddressCityOrTown</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:normalizedStringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityAddressPostalZipCode">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Code for the postal or zip code</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityAddressPostalZipCode</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:normalizedStringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityAddressStateOrProvince">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Name of the state or province.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityAddressStateOrProvince</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:stateOrProvinceItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityCentralIndexKey">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>A unique 10-digit SEC-issued value to identify entities that have filed disclosures with the SEC. It is commonly abbreviated as CIK.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Regulation 12B<br> -Number 240<br> -Section 12<br> -Subsection b-2<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityCentralIndexKey</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:centralIndexKeyItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityCommonStockSharesOutstanding">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Indicate number of shares or other units outstanding of each of registrant's classes of capital or common stock or other ownership interests, if and as stated on cover of related periodic report. Where multiple classes or units exist define each class/interest by adding class of stock items such as Common Class A [Member], Common Class B [Member] or Partnership Interest [Member] onto the Instrument [Domain] of the Entity Listings, Instrument.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityCommonStockSharesOutstanding</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityCurrentReportingStatus">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Indicate 'Yes' or 'No' whether registrants (1) have filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that registrants were required to file such reports), and (2) have been subject to such filing requirements for the past 90 days. This information should be based on the registrant's current or most recent filing containing the related disclosure.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityCurrentReportingStatus</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:yesNoItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityEmergingGrowthCompany">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Indicate if registrant meets the emerging growth company criteria.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Regulation 12B<br> -Number 240<br> -Section 12<br> -Subsection b-2<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityEmergingGrowthCompany</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:booleanItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityFileNumber">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Commission file number. The field allows up to 17 characters. The prefix may contain 1-3 digits, the sequence number may contain 1-8 digits, the optional suffix may contain 1-4 characters, and the fields are separated with a hyphen.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityFileNumber</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:fileNumberItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityFilerCategory">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Indicate whether the registrant is one of the following: Large Accelerated Filer, Accelerated Filer, Non-accelerated Filer. Definitions of these categories are stated in Rule 12b-2 of the Exchange Act. This information should be based on the registrant's current or most recent filing containing the related disclosure.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Regulation 12B<br> -Number 240<br> -Section 12<br> -Subsection b-2<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityFilerCategory</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:filerCategoryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityIncorporationStateCountryCode">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Two-character EDGAR code representing the state or country of incorporation.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityIncorporationStateCountryCode</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:edgarStateCountryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityInteractiveDataCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Boolean flag that is true when the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Regulation S-T<br> -Number 232<br> -Section 405<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityInteractiveDataCurrent</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:yesNoItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityRegistrantName">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The exact name of the entity filing the report as specified in its charter, which is required by forms filed with the SEC.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Regulation 12B<br> -Number 240<br> -Section 12<br> -Subsection b-2<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityRegistrantName</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:normalizedStringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityShellCompany">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Boolean flag that is true when the registrant is a shell company as defined in Rule 12b-2 of the Exchange Act.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Regulation 12B<br> -Number 240<br> -Section 12<br> -Subsection b-2<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityShellCompany</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:booleanItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntitySmallBusiness">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Indicates that the company is a Smaller Reporting Company (SRC).</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Regulation 12B<br> -Number 240<br> -Section 12<br> -Subsection b-2<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntitySmallBusiness</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:booleanItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityTaxIdentificationNumber">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The Tax Identification Number (TIN), also known as an Employer Identification Number (EIN), is a unique 9-digit value assigned by the IRS.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Regulation 12B<br> -Number 240<br> -Section 12<br> -Subsection b-2<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityTaxIdentificationNumber</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:employerIdItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_LocalPhoneNumber">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Local phone number for entity.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_LocalPhoneNumber</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:normalizedStringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_Security12bTitle">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Title of a 12(b) registered security.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Exchange Act<br> -Number 240<br> -Section 12<br> -Subsection b<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_Security12bTitle</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:securityTitleItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_SecurityExchangeName">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Name of the Exchange on which a security is registered.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Exchange Act<br> -Number 240<br> -Section 12<br> -Subsection d1-1<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_SecurityExchangeName</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:edgarExchangeCodeItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_TradingSymbol">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Trading symbol of an instrument as listed on an exchange.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_TradingSymbol</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:tradingSymbolItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
</div>
</body>
</html>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>XML
<SEQUENCE>12
<FILENAME>R2.htm
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
<html>
<head>
<title></title>
<link rel="stylesheet" type="text/css" href="report.css">
<script type="text/javascript" src="Show.js">/* Do Not Remove This Comment */</script><script type="text/javascript">
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<body>
<span style="display: none;">v3.21.2</span><table class="report" border="0" cellspacing="2" id="idm140561288285992">
<tr>
<th class="tl" colspan="1" rowspan="1"><div style="width: 200px;"><strong>Condensed Consolidated Balance Sheets - USD ($)<br></strong></div></th>
<th class="th"><div>Jun. 30, 2021</div></th>
<th class="th"><div>Dec. 31, 2020</div></th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AssetsCurrentAbstract', window );"><strong>Current assets:</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CashAndCashEquivalentsAtCarryingValue', window );">Cash and cash equivalents</a></td>
<td class="nump">$ 26,437,424<span></span>
</td>
<td class="nump">$ 17,164,177<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent', window );">Investment in debt securities - available for sale, at fair value</a></td>
<td class="nump">31,923,285<span></span>
</td>
<td class="text"> <span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_DebtSecuritiesHeldToMaturityAccruedInterestAfterAllowanceForCreditLoss', window );">Accrued interest on investment in debt securities</a></td>
<td class="nump">105,000<span></span>
</td>
<td class="text"> <span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_GrantsReceivableCurrent', window );">Advances and deposits on clinical programs and other current assets</a></td>
<td class="nump">1,844,451<span></span>
</td>
<td class="nump">1,660,695<span></span>
</td>
</tr>
<tr class="rou">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AssetsCurrent', window );">Total current assets</a></td>
<td class="nump">60,310,160<span></span>
</td>
<td class="nump">18,824,872<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PropertyPlantAndEquipmentNet', window );">Property and equipment (at cost, less accumulated depreciation and amortization)</a></td>
<td class="nump">458,551<span></span>
</td>
<td class="nump">294,551<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OtherAssetsAbstract', window );"><strong>Other assets:</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OtherLongTermInvestments', window );">Money market investments, restricted cash</a></td>
<td class="nump">6,000,000<span></span>
</td>
<td class="text"> <span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_DeferredIncomeTaxAssetsNet', window );">Deferred income tax asset</a></td>
<td class="text"> <span></span>
</td>
<td class="nump">1,845,823<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill', window );">In-process research and development, net</a></td>
<td class="nump">13,366,234<span></span>
</td>
<td class="nump">13,366,234<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_Goodwill', window );">Goodwill</a></td>
<td class="nump">1,976,101<span></span>
</td>
<td class="nump">1,976,101<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OperatingLeaseRightOfUseAsset', window );">Operating lease right-of-use assets, net</a></td>
<td class="nump">840,195<span></span>
</td>
<td class="nump">1,047,336<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_FiniteLivedIntangibleAssetsNet', window );">Other intangible assets, net</a></td>
<td class="text"> <span></span>
</td>
<td class="nump">113,660<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_DepositsAssetsNoncurrent', window );">Deposits and other assets</a></td>
<td class="nump">58,761<span></span>
</td>
<td class="nump">58,761<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OtherAssetsNoncurrent', window );">Total other assets</a></td>
<td class="nump">22,241,291<span></span>
</td>
<td class="nump">18,407,915<span></span>
</td>
</tr>
<tr class="reu">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_Assets', window );">Total assets</a></td>
<td class="nump">83,010,002<span></span>
</td>
<td class="nump">37,527,338<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_LiabilitiesCurrentAbstract', window );"><strong>Current liabilities:</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AccountsPayableCurrent', window );">Accounts payable &#8211; trade</a></td>
<td class="nump">2,109,479<span></span>
</td>
<td class="nump">2,244,847<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AccruedLiabilitiesCurrent', window );">Other accrued liabilities</a></td>
<td class="nump">2,312,705<span></span>
</td>
<td class="nump">2,458,532<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_NotesPayableCurrent', window );">Notes payable &#8211; current portion, net of deferred financing costs</a></td>
<td class="text"> <span></span>
</td>
<td class="nump">1,116,663<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OperatingLeaseLiabilityCurrent', window );">Operating lease liability - current portion</a></td>
<td class="nump">458,168<span></span>
</td>
<td class="nump">433,413<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ContractWithCustomerLiabilityCurrent', window );">Deferred revenue - current portion</a></td>
<td class="nump">500,000<span></span>
</td>
<td class="nump">500,000<span></span>
</td>
</tr>
<tr class="rou">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_LiabilitiesCurrent', window );">Total current liabilities</a></td>
<td class="nump">5,380,352<span></span>
</td>
<td class="nump">6,753,455<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent', window );">Earn-out milestone liability</a></td>
<td class="nump">7,088,000<span></span>
</td>
<td class="nump">7,018,000<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_LongTermNotesPayable', window );">Notes payable &#8211; non-current portion, net of deferred financing costs</a></td>
<td class="nump">5,763,087<span></span>
</td>
<td class="nump">3,934,497<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OperatingLeaseLiabilityNoncurrent', window );">Operating lease liability - non-current portion</a></td>
<td class="nump">475,051<span></span>
</td>
<td class="nump">710,305<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_DeferredRevenueNoncurrent', window );">Deferred revenue - non-current portion</a></td>
<td class="nump">250,000<span></span>
</td>
<td class="nump">500,000<span></span>
</td>
</tr>
<tr class="reu">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_Liabilities', window );">Total liabilities</a></td>
<td class="nump">18,956,490<span></span>
</td>
<td class="nump">18,916,257<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CommitmentsAndContingencies', window );">Commitments and contingencies</a></td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockholdersEquityAbstract', window );"><strong>Stockholders&#8217; equity:</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PreferredStockValue', window );">Preferred Stock - $0.01 par value (100,000 shares authorized, and no shares issued or outstanding at June 30, 2021 and December 31, 2020)</a></td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CommonStockValue', window );">Common stock - $0.01 par value (112,500,000 shares authorized; 86,558,070 and 40,701,356 shares issued at June 30, 2021 and December 31, 2020, respectively, and 86,557,736 and 40,701,022 shares outstanding at June 30, 2021 and December 31, 2020, respectively)</a></td>
<td class="nump">865,581<span></span>
</td>
<td class="nump">407,014<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AdditionalPaidInCapital', window );">Additional paid-in capital</a></td>
<td class="nump">386,414,630<span></span>
</td>
<td class="nump">330,289,596<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax', window );">Accumulated other comprehensive loss</a></td>
<td class="num">(3,770)<span></span>
</td>
<td class="text"> <span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_RetainedEarningsAccumulatedDeficit', window );">Accumulated deficit</a></td>
<td class="num">(323,137,741)<span></span>
</td>
<td class="num">(312,000,341)<span></span>
</td>
</tr>
<tr class="reu">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockholdersEquityBeforeTreasuryStock', window );">Total stockholders&#8217; equity before treasury stock</a></td>
<td class="nump">64,138,700<span></span>
</td>
<td class="nump">18,696,269<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_TreasuryStockValue', window );">Treasury stock, at cost (334 shares at June 30, 2021 and December 31, 2020)</a></td>
<td class="num">(85,188)<span></span>
</td>
<td class="num">(85,188)<span></span>
</td>
</tr>
<tr class="reu">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockholdersEquity', window );">Total stockholders&#8217; equity</a></td>
<td class="nump">64,053,512<span></span>
</td>
<td class="nump">18,611,081<span></span>
</td>
</tr>
<tr class="rou">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_LiabilitiesAndStockholdersEquity', window );">Total liabilities and stockholders&#8217; equity</a></td>
<td class="nump">$ 83,010,002<span></span>
</td>
<td class="nump">$ 37,527,338<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_AccountsPayableCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.19(a))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 2: http://www.xbrl.org/2003/role/exampleRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 852<br> -SubTopic 10<br> -Section 55<br> -Paragraph 10<br> -URI http://asc.fasb.org/extlink&amp;oid=84165509&amp;loc=d3e56426-112766<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AccountsPayableCurrent</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_AccruedLiabilitiesCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.20)<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AccruedLiabilitiesCurrent</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(30)(a)(4))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 220<br> -SubTopic 10<br> -Section 45<br> -Paragraph 11<br> -URI http://asc.fasb.org/extlink&amp;oid=124509347&amp;loc=d3e637-108580<br><br>Reference 3: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 944<br> -SubTopic 210<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.7-03(a)(23)(a)(3))<br> -URI http://asc.fasb.org/extlink&amp;oid=120400017&amp;loc=d3e572229-122910<br><br>Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 220<br> -SubTopic 10<br> -Section 45<br> -Paragraph 14A<br> -URI http://asc.fasb.org/extlink&amp;oid=124509347&amp;loc=SL7669686-108580<br><br>Reference 5: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 944<br> -SubTopic 40<br> -Section 65<br> -Paragraph 2<br> -Subparagraph (h)(2)<br> -URI http://asc.fasb.org/extlink&amp;oid=124501264&amp;loc=SL117420844-207641<br><br>Reference 6: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 944<br> -SubTopic 40<br> -Section 65<br> -Paragraph 2<br> -Subparagraph (g)(2)(ii)<br> -URI http://asc.fasb.org/extlink&amp;oid=124501264&amp;loc=SL117420844-207641<br><br>Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 220<br> -SubTopic 10<br> -Section 45<br> -Paragraph 14<br> -URI http://asc.fasb.org/extlink&amp;oid=124509347&amp;loc=d3e681-108580<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_AdditionalPaidInCapital">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of excess of issue price over par or stated value of stock and from other transaction involving stock or stockholder. Includes, but is not limited to, additional paid-in capital (APIC) for common and preferred stock.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/exampleRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 852<br> -SubTopic 10<br> -Section 55<br> -Paragraph 10<br> -URI http://asc.fasb.org/extlink&amp;oid=84165509&amp;loc=d3e56426-112766<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 65<br> -Paragraph 15<br> -Subparagraph (g)(2)<br> -URI http://asc.fasb.org/extlink&amp;oid=121322162&amp;loc=SL121327923-165333<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(30)(a)(1))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AdditionalPaidInCapital</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_Assets">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 942<br> -SubTopic 210<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.9-03(11))<br> -URI http://asc.fasb.org/extlink&amp;oid=120398452&amp;loc=d3e534808-122878<br><br>Reference 2: http://www.xbrl.org/2003/role/exampleRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 852<br> -SubTopic 10<br> -Section 55<br> -Paragraph 10<br> -URI http://asc.fasb.org/extlink&amp;oid=84165509&amp;loc=d3e56426-112766<br><br>Reference 3: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1B<br> -Subparagraph (SX 210.13-02(a)(4)(iii)(A))<br> -URI 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-Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1A<br> -Subparagraph (SX 210.13-01(a)(5))<br> -URI http://asc.fasb.org/extlink&amp;oid=124359900&amp;loc=SL124442526-122756<br><br>Reference 11: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1A<br> -Subparagraph (SX 210.13-01(a)(4)(iii)(A))<br> -URI http://asc.fasb.org/extlink&amp;oid=124359900&amp;loc=SL124442526-122756<br><br>Reference 12: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 235<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.4-08(g)(1)(ii))<br> -URI http://asc.fasb.org/extlink&amp;oid=120395691&amp;loc=d3e23780-122690<br><br>Reference 13: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1A<br> -Subparagraph (SX 210.13-01(a)(4)(i))<br> -URI http://asc.fasb.org/extlink&amp;oid=124359900&amp;loc=SL124442526-122756<br><br>Reference 14: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1A<br> -Subparagraph (SX 210.13-01(a)(4)(iii))<br> -URI http://asc.fasb.org/extlink&amp;oid=124359900&amp;loc=SL124442526-122756<br><br>Reference 15: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 825<br> -SubTopic 10<br> -Section 50<br> -Paragraph 28<br> -Subparagraph (f)<br> -URI http://asc.fasb.org/extlink&amp;oid=123596393&amp;loc=d3e14064-108612<br><br>Reference 16: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1B<br> -Subparagraph (SX 210.13-02(a)(4)(iii)(B))<br> -URI http://asc.fasb.org/extlink&amp;oid=124359900&amp;loc=SL124442552-122756<br><br>Reference 17: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 810<br> -SubTopic 10<br> -Section 50<br> -Paragraph 3<br> -Subparagraph (bb)<br> -URI http://asc.fasb.org/extlink&amp;oid=123419778&amp;loc=d3e5710-111685<br><br>Reference 18: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1B<br> -Subparagraph (SX 210.13-02(a)(5))<br> -URI http://asc.fasb.org/extlink&amp;oid=124359900&amp;loc=SL124442552-122756<br><br>Reference 19: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 810<br> -SubTopic 10<br> -Section 45<br> -Paragraph 25<br> -Subparagraph (a)<br> -URI 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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_Assets</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_AssetsCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Sum of the carrying amounts as of the balance sheet date of all assets that are expected to be realized in cash, sold, or consumed within one year (or the normal operating cycle, if longer). Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.</p></div>
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-Paragraph 1B<br> -Subparagraph (SX 210.13-02(a)(4)(iii)(B))<br> -URI http://asc.fasb.org/extlink&amp;oid=124359900&amp;loc=SL124442552-122756<br><br>Reference 14: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 323<br> -SubTopic 10<br> -Section 50<br> -Paragraph 3<br> -Subparagraph (c)<br> -URI http://asc.fasb.org/extlink&amp;oid=114001798&amp;loc=d3e33918-111571<br><br>Reference 15: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1A<br> -Subparagraph (SX 210.13-01(a)(4)(ii))<br> -URI http://asc.fasb.org/extlink&amp;oid=124359900&amp;loc=SL124442526-122756<br><br>Reference 16: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1B<br> -Subparagraph (SX 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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AssetsCurrent</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_AssetsCurrentAbstract">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AssetsCurrentAbstract</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), classified as current.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 326<br> -SubTopic 30<br> -Section 45<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=124258926&amp;loc=SL82898722-210454<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 320<br> -SubTopic 10<br> -Section 45<br> -Paragraph 2<br> -URI http://asc.fasb.org/extlink&amp;oid=124260329&amp;loc=d3e26626-111562<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
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<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of liability recognized arising from contingent consideration in a business combination, expected to be settled beyond one year or the normal operating cycle, if longer.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 805<br> -SubTopic 30<br> -Section 25<br> -Paragraph 6<br> -URI http://asc.fasb.org/extlink&amp;oid=6911189&amp;loc=d3e6408-128476<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 805<br> -SubTopic 30<br> -Section 35<br> -Paragraph 1<br> -Subparagraph b<br> -URI http://asc.fasb.org/extlink&amp;oid=116859824&amp;loc=d3e6819-128478<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_CashAndCashEquivalentsAtCarryingValue">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 4<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3044-108585<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section 45<br> -Paragraph 1<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=124098289&amp;loc=d3e6676-107765<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.1)<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_CashAndCashEquivalentsAtCarryingValue</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Represents the caption on the face of the balance sheet to indicate that the entity has entered into (1) purchase or supply arrangements that will require expending a portion of its resources to meet the terms thereof, and (2) is exposed to potential losses or, less frequently, gains, arising from (a) possible claims against a company's resources due to future performance under contract terms, and (b) possible losses or likely gains from uncertainties that will ultimately be resolved when one or more future events that are deemed likely to occur do occur or fail to occur.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.25)<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 944<br> -SubTopic 210<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.7-03.(a),19)<br> -URI http://asc.fasb.org/extlink&amp;oid=120400017&amp;loc=d3e572229-122910<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 942<br> -SubTopic 210<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.9-03.17)<br> -URI http://asc.fasb.org/extlink&amp;oid=120398452&amp;loc=d3e534808-122878<br><br>Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 450<br> -SubTopic 20<br> -Section 50<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=121557415&amp;loc=d3e14326-108349<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_CommitmentsAndContingencies</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_CommonStockValue">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Aggregate par or stated value of issued nonredeemable common stock (or common stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' equity.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/exampleRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 852<br> -SubTopic 10<br> -Section 55<br> -Paragraph 10<br> -URI http://asc.fasb.org/extlink&amp;oid=84165509&amp;loc=d3e56426-112766<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(29))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_CommonStockValue</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ContractWithCustomerLiabilityCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 606<br> -SubTopic 10<br> -Section 45<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=123360276&amp;loc=SL49130531-203044<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 606<br> -SubTopic 10<br> -Section 45<br> -Paragraph 2<br> -URI http://asc.fasb.org/extlink&amp;oid=123360276&amp;loc=SL49130532-203044<br><br>Reference 3: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 606<br> -SubTopic 10<br> -Section 50<br> -Paragraph 8<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=123351226&amp;loc=SL49130549-203045<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ContractWithCustomerLiabilityCurrent</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_DebtSecuritiesHeldToMaturityAccruedInterestAfterAllowanceForCreditLoss">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount, after allowance for credit loss, of accrued interest on investment in debt security measured at amortized cost (held-to-maturity).</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 320<br> -SubTopic 10<br> -Section 50<br> -Paragraph 5C<br> -URI http://asc.fasb.org/extlink&amp;oid=123581744&amp;loc=SL121698325-111563<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 326<br> -SubTopic 20<br> -Section 45<br> -Paragraph 5<br> -URI http://asc.fasb.org/extlink&amp;oid=124255206&amp;loc=SL120267845-210446<br><br>Reference 3: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 326<br> -SubTopic 20<br> -Section 50<br> -Paragraph 3A<br> -URI http://asc.fasb.org/extlink&amp;oid=124255953&amp;loc=SL120267960-210447<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_DebtSecuritiesHeldToMaturityAccruedInterestAfterAllowanceForCreditLoss</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_DeferredIncomeTaxAssetsNet">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, with jurisdictional netting.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 740<br> -SubTopic 10<br> -Section 45<br> -Paragraph 6<br> -URI http://asc.fasb.org/extlink&amp;oid=123427490&amp;loc=d3e31931-109318<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 740<br> -SubTopic 10<br> -Section 45<br> -Paragraph 4<br> -URI http://asc.fasb.org/extlink&amp;oid=123427490&amp;loc=d3e31917-109318<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_DeferredIncomeTaxAssetsNet</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_DeferredRevenueNoncurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of deferred income and obligation to transfer product and service to customer for which consideration has been received or is receivable, classified as noncurrent.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(5))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_DeferredRevenueNoncurrent</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_DepositsAssetsNoncurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Carrying value of amounts transferred to third parties for security purposes that are expected to be returned or applied towards payment after one year or beyond the operating cycle, if longer.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.17)<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_DepositsAssetsNoncurrent</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_FiniteLivedIntangibleAssetsNet">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 926<br> -SubTopic 20<br> -Section 50<br> -Paragraph 5<br> -URI http://asc.fasb.org/extlink&amp;oid=120154696&amp;loc=d3e54445-107959<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 350<br> -SubTopic 30<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (a)(1)<br> -URI http://asc.fasb.org/extlink&amp;oid=66006027&amp;loc=d3e16323-109275<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_FiniteLivedIntangibleAssetsNet</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_Goodwill">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 942<br> -SubTopic 210<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.9-03(10)(1))<br> -URI http://asc.fasb.org/extlink&amp;oid=120398452&amp;loc=d3e534808-122878<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 350<br> -SubTopic 20<br> -Section 45<br> -Paragraph 5<br> -URI http://asc.fasb.org/extlink&amp;oid=120320667&amp;loc=SL49117168-202975<br><br>Reference 3: http://www.xbrl.org/2003/role/exampleRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 852<br> -SubTopic 10<br> -Section 55<br> -Paragraph 10<br> -URI http://asc.fasb.org/extlink&amp;oid=84165509&amp;loc=d3e56426-112766<br><br>Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 350<br> -SubTopic 20<br> -Section 45<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=99380562&amp;loc=d3e13770-109266<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_Goodwill</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_GrantsReceivableCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Carrying amount as of the balance sheet date of amounts due under the terms of governmental, corporate, or foundation grants. For classified balance sheets, represents the current amount receivable, that is amounts expected to be collected within one year or the normal operating cycle, if longer.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.8)<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_GrantsReceivableCurrent</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 350<br> -SubTopic 30<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=66006027&amp;loc=d3e16323-109275<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_Liabilities">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Sum of the carrying amounts as of the balance sheet date of all liabilities that are recognized. Liabilities are probable future sacrifices of economic benefits arising from present obligations of an entity to transfer assets or provide services to other entities in the future.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.19-26)<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 852<br> -SubTopic 10<br> -Section 50<br> -Paragraph 7<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=124433192&amp;loc=SL2890621-112765<br><br>Reference 3: http://www.xbrl.org/2003/role/exampleRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 30<br> -Subparagraph (d)<br> -URI 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Standards Codification<br> -Topic 470<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1B<br> -Subparagraph (SX 210.13-02(a)(4)(iii)(B))<br> -URI http://asc.fasb.org/extlink&amp;oid=124359900&amp;loc=SL124442552-122756<br><br>Reference 11: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1A<br> -Subparagraph (SX 210.13-01(a)(4)(iv))<br> -URI http://asc.fasb.org/extlink&amp;oid=124359900&amp;loc=SL124442526-122756<br><br>Reference 12: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 810<br> -SubTopic 10<br> -Section 50<br> -Paragraph 3<br> -Subparagraph (c)<br> -URI http://asc.fasb.org/extlink&amp;oid=123419778&amp;loc=d3e5710-111685<br><br>Reference 13: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 323<br> -SubTopic 10<br> -Section 50<br> -Paragraph 3<br> -Subparagraph (c)<br> -URI http://asc.fasb.org/extlink&amp;oid=114001798&amp;loc=d3e33918-111571<br><br>Reference 14: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1A<br> -Subparagraph (SX 210.13-01(a)(5))<br> -URI http://asc.fasb.org/extlink&amp;oid=124359900&amp;loc=SL124442526-122756<br><br>Reference 15: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1A<br> -Subparagraph (SX 210.13-01(a)(4)(iii)(A))<br> -URI http://asc.fasb.org/extlink&amp;oid=124359900&amp;loc=SL124442526-122756<br><br>Reference 16: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1B<br> -Subparagraph (SX 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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_Liabilities</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_LiabilitiesAndStockholdersEquity">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of liabilities and equity items, including the portion of equity attributable to noncontrolling interests, if any.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 323<br> -SubTopic 10<br> -Section 50<br> -Paragraph 3<br> -Subparagraph (c)<br> -URI http://asc.fasb.org/extlink&amp;oid=114001798&amp;loc=d3e33918-111571<br><br>Reference 2: http://www.xbrl.org/2003/role/exampleRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 852<br> -SubTopic 10<br> -Section 55<br> -Paragraph 10<br> -URI http://asc.fasb.org/extlink&amp;oid=84165509&amp;loc=d3e56426-112766<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 942<br> -SubTopic 210<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.9-03(23))<br> -URI http://asc.fasb.org/extlink&amp;oid=120398452&amp;loc=d3e534808-122878<br><br>Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 944<br> -SubTopic 210<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.7-03(a)(25))<br> -URI http://asc.fasb.org/extlink&amp;oid=120400017&amp;loc=d3e572229-122910<br><br>Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 235<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.4-08(g)(1)(ii))<br> -URI http://asc.fasb.org/extlink&amp;oid=120395691&amp;loc=d3e23780-122690<br><br>Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(32))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 825<br> -SubTopic 10<br> -Section 50<br> -Paragraph 28<br> -Subparagraph (f)<br> -URI http://asc.fasb.org/extlink&amp;oid=123596393&amp;loc=d3e14064-108612<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_LiabilitiesAndStockholdersEquity</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_LiabilitiesCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Total obligations incurred as part of normal operations that are expected to be paid during the following twelve months or within one business cycle, if longer.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/exampleRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 852<br> -SubTopic 10<br> -Section 55<br> -Paragraph 10<br> -URI http://asc.fasb.org/extlink&amp;oid=84165509&amp;loc=d3e56426-112766<br><br>Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 852<br> -SubTopic 10<br> -Section 50<br> -Paragraph 7<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=124433192&amp;loc=SL2890621-112765<br><br>Reference 3: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1B<br> -Subparagraph (SX 210.13-02(a)(4)(iii)(A))<br> -URI 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-Subparagraph (f)<br> -URI http://asc.fasb.org/extlink&amp;oid=123596393&amp;loc=d3e14064-108612<br><br>Reference 20: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.21)<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_LiabilitiesCurrent</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_LiabilitiesCurrentAbstract">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_LiabilitiesCurrentAbstract</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_LongTermNotesPayable">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Carrying value as of the balance sheet date of notes payable (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.22)<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_LongTermNotesPayable</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_NotesPayableCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Sum of the carrying values as of the balance sheet date of the portions of long-term notes payable due within one year or the operating cycle if longer.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.19,20)<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_NotesPayableCurrent</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_OperatingLeaseLiabilityCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Present value of lessee's discounted obligation for lease payments from operating lease, classified as current.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -Section 45<br> -Paragraph 1<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=123391704&amp;loc=SL77918627-209977<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_OperatingLeaseLiabilityCurrent</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_OperatingLeaseLiabilityNoncurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Present value of lessee's discounted obligation for lease payments from operating lease, classified as noncurrent.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -Section 45<br> -Paragraph 1<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=123391704&amp;loc=SL77918627-209977<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_OperatingLeaseLiabilityNoncurrent</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_OperatingLeaseRightOfUseAsset">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of lessee's right to use underlying asset under operating lease.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -Section 45<br> -Paragraph 1<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=123391704&amp;loc=SL77918627-209977<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_OperatingLeaseRightOfUseAsset</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_OtherAssetsAbstract">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_OtherAssetsAbstract</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_OtherAssetsNoncurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of noncurrent assets classified as other.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.17)<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_OtherAssetsNoncurrent</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_OtherLongTermInvestments">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of long-term investments classified as other.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 944<br> -SubTopic 210<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.7-03.1(f))<br> -URI http://asc.fasb.org/extlink&amp;oid=120400017&amp;loc=d3e572229-122910<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.12)<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_OtherLongTermInvestments</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_PreferredStockValue">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Aggregate par or stated value of issued nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable preferred shares, par value and other disclosure concepts are in another section within stockholders' equity.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(28))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 2: http://www.xbrl.org/2003/role/exampleRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 852<br> -SubTopic 10<br> -Section 55<br> -Paragraph 10<br> -URI http://asc.fasb.org/extlink&amp;oid=84165509&amp;loc=d3e56426-112766<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_PreferredStockValue</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_PropertyPlantAndEquipmentNet">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(14))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 360<br> -SubTopic 10<br> -Section 50<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=6391035&amp;loc=d3e2868-110229<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 944<br> -SubTopic 210<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.7-03(a)(8))<br> -URI http://asc.fasb.org/extlink&amp;oid=120400017&amp;loc=d3e572229-122910<br><br>Reference 4: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 942<br> -SubTopic 360<br> -Section 50<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=124429447&amp;loc=SL124453093-239630<br><br>Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(13))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 6: http://www.xbrl.org/2003/role/exampleRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 852<br> -SubTopic 10<br> -Section 55<br> -Paragraph 10<br> -URI http://asc.fasb.org/extlink&amp;oid=84165509&amp;loc=d3e56426-112766<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_PropertyPlantAndEquipmentNet</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_RetainedEarningsAccumulatedDeficit">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The cumulative amount of the reporting entity's undistributed earnings or deficit.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(30)(a)(3))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 2: http://www.xbrl.org/2003/role/exampleRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 852<br> -SubTopic 10<br> -Section 55<br> -Paragraph 10<br> -URI http://asc.fasb.org/extlink&amp;oid=84165509&amp;loc=d3e56426-112766<br><br>Reference 3: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 65<br> -Paragraph 15<br> -Subparagraph (g)(2)<br> -URI http://asc.fasb.org/extlink&amp;oid=121322162&amp;loc=SL121327923-165333<br><br>Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 944<br> -SubTopic 210<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.7-03(a)(23)(a)(4))<br> -URI http://asc.fasb.org/extlink&amp;oid=120400017&amp;loc=d3e572229-122910<br><br>Reference 5: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 944<br> -SubTopic 40<br> -Section 65<br> -Paragraph 2<br> -Subparagraph (h)(2)<br> -URI http://asc.fasb.org/extlink&amp;oid=124501264&amp;loc=SL117420844-207641<br><br>Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.3-04)<br> -URI http://asc.fasb.org/extlink&amp;oid=120397183&amp;loc=d3e187085-122770<br><br>Reference 7: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 944<br> -SubTopic 40<br> -Section 65<br> -Paragraph 2<br> -Subparagraph (g)(2)(i)<br> -URI http://asc.fasb.org/extlink&amp;oid=124501264&amp;loc=SL117420844-207641<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_RetainedEarningsAccumulatedDeficit</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_StockholdersEquity">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 235<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.4-08(g)(1)(ii))<br> -URI http://asc.fasb.org/extlink&amp;oid=120395691&amp;loc=d3e23780-122690<br><br>Reference 2: http://www.xbrl.org/2003/role/exampleRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 852<br> -SubTopic 10<br> -Section 55<br> -Paragraph 10<br> -URI http://asc.fasb.org/extlink&amp;oid=84165509&amp;loc=d3e56426-112766<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 310<br> -SubTopic 10<br> -Section S99<br> -Paragraph 2<br> -Subparagraph (SAB Topic 4.E)<br> -URI http://asc.fasb.org/extlink&amp;oid=122038336&amp;loc=d3e74512-122707<br><br>Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(31))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(29))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(30))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 825<br> -SubTopic 10<br> -Section 50<br> -Paragraph 28<br> -Subparagraph (f)<br> -URI http://asc.fasb.org/extlink&amp;oid=123596393&amp;loc=d3e14064-108612<br><br>Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 323<br> -SubTopic 10<br> -Section 50<br> -Paragraph 3<br> -Subparagraph (c)<br> -URI http://asc.fasb.org/extlink&amp;oid=114001798&amp;loc=d3e33918-111571<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_StockholdersEquity</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
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<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
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<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_StockholdersEquityAbstract">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_StockholdersEquityAbstract</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
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<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
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<td><strong> Balance Type:</strong></td>
<td>na</td>
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<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_StockholdersEquityBeforeTreasuryStock">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Total amount of stockholders' equity (deficit) items including stock value, paid in capital, retained earnings and including equity attributable to noncontrolling interests and before deducting the carrying value of treasury stock.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_StockholdersEquityBeforeTreasuryStock</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
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<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
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<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
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<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_TreasuryStockValue">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 30<br> -Section 50<br> -Paragraph 4<br> -URI http://asc.fasb.org/extlink&amp;oid=6405834&amp;loc=d3e23315-112656<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.29,30)<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 30<br> -Section 45<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=6405813&amp;loc=d3e23239-112655<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_TreasuryStockValue</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
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<span style="display: none;">v3.21.2</span><table class="report" border="0" cellspacing="2" id="idm140561281150440">
<tr>
<th class="tl" colspan="1" rowspan="1"><div style="width: 200px;"><strong>Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares<br></strong></div></th>
<th class="th"><div>Jun. 30, 2021</div></th>
<th class="th"><div>Dec. 31, 2020</div></th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StatementOfFinancialPositionAbstract', window );"><strong>Statement of Financial Position [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PreferredStockParOrStatedValuePerShare', window );">Preferred stock, par value</a></td>
<td class="nump">$ 0.01<span></span>
</td>
<td class="nump">$ 0.01<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PreferredStockSharesAuthorized', window );">Preferred stock, shares authorized</a></td>
<td class="nump">100,000<span></span>
</td>
<td class="nump">100,000<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PreferredStockSharesIssued', window );">Preferred stock, shares issued</a></td>
<td class="nump">0<span></span>
</td>
<td class="nump">0<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PreferredStockSharesOutstanding', window );">Preferred stock, shares outstanding</a></td>
<td class="nump">0<span></span>
</td>
<td class="nump">0<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CommonStockParOrStatedValuePerShare', window );">Common stock, par value</a></td>
<td class="nump">$ 0.01<span></span>
</td>
<td class="nump">$ 0.01<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CommonStockSharesAuthorized', window );">Common stock, shares authorized</a></td>
<td class="nump">112,500,000<span></span>
</td>
<td class="nump">112,500,000<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CommonStockSharesIssued', window );">Common stock, shares issued</a></td>
<td class="nump">86,558,070<span></span>
</td>
<td class="nump">40,701,356<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CommonStockSharesOutstanding', window );">Common stock, shares outstanding</a></td>
<td class="nump">86,557,736<span></span>
</td>
<td class="nump">40,701,022<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_TreasuryStockShares', window );">Treasury stock, shares</a></td>
<td class="nump">334<span></span>
</td>
<td class="nump">334<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_CommonStockParOrStatedValuePerShare">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Face amount or stated value per share of common stock.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(29))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_CommonStockParOrStatedValuePerShare</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dtr-types:perShareItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_CommonStockSharesAuthorized">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The maximum number of common shares permitted to be issued by an entity's charter and bylaws.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(29))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_CommonStockSharesAuthorized</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_CommonStockSharesIssued">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(29))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_CommonStockSharesIssued</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_CommonStockSharesOutstanding">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -URI http://asc.fasb.org/extlink&amp;oid=123467817&amp;loc=d3e21463-112644<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(29))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_CommonStockSharesOutstanding</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_PreferredStockParOrStatedValuePerShare">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(28))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section 50<br> -Paragraph 13<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=123467817&amp;loc=SL123496158-112644<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_PreferredStockParOrStatedValuePerShare</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dtr-types:perShareItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_PreferredStockSharesAuthorized">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(28))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_PreferredStockSharesAuthorized</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_PreferredStockSharesIssued">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(28))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section 50<br> -Paragraph 13<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=123467817&amp;loc=SL123496158-112644<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_PreferredStockSharesIssued</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_PreferredStockSharesOutstanding">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(28))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_PreferredStockSharesOutstanding</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_StatementOfFinancialPositionAbstract">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_StatementOfFinancialPositionAbstract</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_TreasuryStockShares">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.29,30)<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 30<br> -Section 45<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=6405813&amp;loc=d3e23239-112655<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_TreasuryStockShares</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
</div>
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<head>
<title></title>
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<span style="display: none;">v3.21.2</span><table class="report" border="0" cellspacing="2" id="idm140561371685800">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Condensed Consolidated Statements of Operations (Unaudited) - USD ($)<br></strong></div></th>
<th class="th" colspan="2">3 Months Ended</th>
<th class="th" colspan="2">6 Months Ended</th>
</tr>
<tr>
<th class="th"><div>Jun. 30, 2021</div></th>
<th class="th"><div>Jun. 30, 2020</div></th>
<th class="th"><div>Jun. 30, 2021</div></th>
<th class="th"><div>Jun. 30, 2020</div></th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_IncomeStatementAbstract', window );"><strong>Income Statement [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax', window );">Licensing revenue</a></td>
<td class="nump">$ 125,000<span></span>
</td>
<td class="nump">$ 125,000<span></span>
</td>
<td class="nump">$ 250,000<span></span>
</td>
<td class="nump">$ 250,000<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OperatingExpensesAbstract', window );"><strong>Operating expenses:</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ResearchAndDevelopmentExpense', window );">Research and development</a></td>
<td class="nump">2,593,412<span></span>
</td>
<td class="nump">2,990,861<span></span>
</td>
<td class="nump">5,164,985<span></span>
</td>
<td class="nump">6,042,910<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_GeneralAndAdministrativeExpense', window );">General and administrative</a></td>
<td class="nump">2,602,990<span></span>
</td>
<td class="nump">1,901,136<span></span>
</td>
<td class="nump">5,539,761<span></span>
</td>
<td class="nump">3,740,042<span></span>
</td>
</tr>
<tr class="rou">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OperatingExpenses', window );">Total operating expenses</a></td>
<td class="nump">5,196,402<span></span>
</td>
<td class="nump">4,891,997<span></span>
</td>
<td class="nump">10,704,746<span></span>
</td>
<td class="nump">9,782,952<span></span>
</td>
</tr>
<tr class="reu">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OperatingIncomeLoss', window );">Loss from operations</a></td>
<td class="num">(5,071,402)<span></span>
</td>
<td class="num">(4,766,997)<span></span>
</td>
<td class="num">(10,454,746)<span></span>
</td>
<td class="num">(9,532,952)<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OtherIncomeAndExpensesAbstract', window );"><strong>Other (expense) income:</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_GainLossFromChangeInEarnoutMilestoneLiability', window );">Gain (loss) from change in valuation of earn-out milestone liability</a></td>
<td class="nump">81,000<span></span>
</td>
<td class="num">(256,296)<span></span>
</td>
<td class="num">(70,000)<span></span>
</td>
<td class="num">(297,570)<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_InvestmentIncomeLossNonoperating', window );">Investment income</a></td>
<td class="num">(349)<span></span>
</td>
<td class="nump">20,960<span></span>
</td>
<td class="nump">2,062<span></span>
</td>
<td class="nump">109,269<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_InterestAndDebtExpense', window );">Interest expense</a></td>
<td class="num">(221,227)<span></span>
</td>
<td class="num">(340,602)<span></span>
</td>
<td class="num">(378,841)<span></span>
</td>
<td class="num">(679,967)<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_RecognizedGainsLossesOnExtinguishmentOfDebtNonoperating', window );">Recognized loss on extinguishment of debt</a></td>
<td class="num">(234,419)<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="num">(234,419)<span></span>
</td>
<td class="text"> <span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OtherNonoperatingIncomeExpense', window );">Other (expense) income</a></td>
<td class="num">(2,000)<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="num">(1,456)<span></span>
</td>
<td class="nump">1,407<span></span>
</td>
</tr>
<tr class="rou">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_NonoperatingIncomeExpense', window );">Total other (expense) income, net</a></td>
<td class="num">(376,995)<span></span>
</td>
<td class="num">(575,938)<span></span>
</td>
<td class="num">(682,654)<span></span>
</td>
<td class="num">(866,861)<span></span>
</td>
</tr>
<tr class="reu">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_NetIncomeLoss', window );">Net loss</a></td>
<td class="num">$ (5,448,397)<span></span>
</td>
<td class="num">$ (5,342,935)<span></span>
</td>
<td class="num">$ (11,137,400)<span></span>
</td>
<td class="num">$ (10,399,813)<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_EarningsPerShareBasicAndDiluted', window );">Basic and diluted</a></td>
<td class="num">$ (0.06)<span></span>
</td>
<td class="num">$ (0.18)<span></span>
</td>
<td class="num">$ (0.15)<span></span>
</td>
<td class="num">$ (0.37)<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted', window );">Basic and diluted</a></td>
<td class="nump">85,923,755<span></span>
</td>
<td class="nump">29,887,329<span></span>
</td>
<td class="nump">76,165,451<span></span>
</td>
<td class="nump">27,830,573<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_CLSN_GainLossFromChangeInEarnoutMilestoneLiability">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Gain (loss) from change in valuation of earn-out milestone liability.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">CLSN_GainLossFromChangeInEarnoutMilestoneLiability</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>CLSN_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_CLSN_InvestmentIncomeLossNonoperating">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">CLSN_InvestmentIncomeLossNonoperating</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>CLSN_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_CLSN_RecognizedGainsLossesOnExtinguishmentOfDebtNonoperating">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">CLSN_RecognizedGainsLossesOnExtinguishmentOfDebtNonoperating</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>CLSN_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_EarningsPerShareBasicAndDiluted">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements.  Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period.  Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 260<br> -SubTopic 10<br> -Section 45<br> -Paragraph 7<br> -URI http://asc.fasb.org/extlink&amp;oid=125511455&amp;loc=d3e1337-109256<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_EarningsPerShareBasicAndDiluted</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dtr-types:perShareItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_GeneralAndAdministrativeExpense">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 220<br> -SubTopic 10<br> -Section S99<br> -Paragraph 2<br> -Subparagraph (SX 210.5-03.4)<br> -URI http://asc.fasb.org/extlink&amp;oid=123367319&amp;loc=SL114868664-224227<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_GeneralAndAdministrativeExpense</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_IncomeStatementAbstract">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_IncomeStatementAbstract</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_InterestAndDebtExpense">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Interest and debt related expenses associated with nonoperating financing activities of the entity.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 835<br> -SubTopic 20<br> -Section 50<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=6450988&amp;loc=d3e26243-108391<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_InterestAndDebtExpense</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_NetIncomeLoss">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 942<br> -SubTopic 220<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.9-04(22))<br> -URI http://asc.fasb.org/extlink&amp;oid=120399700&amp;loc=SL114874048-224260<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 32<br> -Subparagraph (f)<br> -URI http://asc.fasb.org/extlink&amp;oid=123359005&amp;loc=d3e8933-108599<br><br>Reference 3: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 250<br> -SubTopic 10<br> -Section 50<br> -Paragraph 4<br> -URI 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Standards Codification<br> -Topic 470<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1B<br> -Subparagraph (SX 210.13-02(a)(4)(iii)(A))<br> -URI http://asc.fasb.org/extlink&amp;oid=124359900&amp;loc=SL124442552-122756<br><br>Reference 34: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 30<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=123359005&amp;loc=d3e8906-108599<br><br>Reference 35: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 32<br> -Subparagraph (c)<br> -URI http://asc.fasb.org/extlink&amp;oid=123359005&amp;loc=d3e8933-108599<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_NetIncomeLoss</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
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</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_NonoperatingIncomeExpense">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The aggregate amount of income or expense from ancillary business-related activities (that is to say, excluding major activities considered part of the normal operations of the business).</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 220<br> -SubTopic 10<br> -Section S99<br> -Paragraph 2<br> -Subparagraph (SX 210.5-03.7)<br> -URI http://asc.fasb.org/extlink&amp;oid=123367319&amp;loc=SL114868664-224227<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_NonoperatingIncomeExpense</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
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<td><strong> Data Type:</strong></td>
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<td><strong> Balance Type:</strong></td>
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<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_OperatingExpenses">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Includes selling, general and administrative expense.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_OperatingExpenses</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_OperatingExpensesAbstract">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_OperatingExpensesAbstract</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_OperatingIncomeLoss">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The net result for the period of deducting operating expenses from operating revenues.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/exampleRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 31<br> -URI http://asc.fasb.org/extlink&amp;oid=123359005&amp;loc=d3e8924-108599<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 30<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=123359005&amp;loc=d3e8906-108599<br><br>Reference 3: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 32<br> -Subparagraph (c)<br> -URI http://asc.fasb.org/extlink&amp;oid=123359005&amp;loc=d3e8933-108599<br><br>Reference 4: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 32<br> -Subparagraph (f)<br> -URI http://asc.fasb.org/extlink&amp;oid=123359005&amp;loc=d3e8933-108599<br><br>Reference 5: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 22<br> -URI http://asc.fasb.org/extlink&amp;oid=123359005&amp;loc=d3e8736-108599<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_OperatingIncomeLoss</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_OtherIncomeAndExpensesAbstract">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_OtherIncomeAndExpensesAbstract</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_OtherNonoperatingIncomeExpense">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of income (expense) related to nonoperating activities, classified as other.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 220<br> -SubTopic 10<br> -Section S99<br> -Paragraph 2<br> -Subparagraph (SX 210.5-03.9)<br> -URI http://asc.fasb.org/extlink&amp;oid=123367319&amp;loc=SL114868664-224227<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_OtherNonoperatingIncomeExpense</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ResearchAndDevelopmentExpense">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 912<br> -SubTopic 730<br> -Section 25<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=6472174&amp;loc=d3e58812-109433<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 985<br> -SubTopic 20<br> -Section 50<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=6501960&amp;loc=d3e128462-111756<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 730<br> -SubTopic 10<br> -Section 50<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=6420194&amp;loc=d3e21568-108373<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ResearchAndDevelopmentExpense</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 30<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=123359005&amp;loc=d3e8906-108599<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 40<br> -URI http://asc.fasb.org/extlink&amp;oid=123359005&amp;loc=d3e9031-108599<br><br>Reference 3: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 41<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=123359005&amp;loc=d3e9038-108599<br><br>Reference 4: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 32<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=123359005&amp;loc=d3e8933-108599<br><br>Reference 5: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 32<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=123359005&amp;loc=d3e8933-108599<br><br>Reference 6: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 606<br> -SubTopic 10<br> -Section 50<br> -Paragraph 4<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=123351226&amp;loc=SL49130543-203045<br><br>Reference 7: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 22<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=123359005&amp;loc=d3e8736-108599<br><br>Reference 8: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 22<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=123359005&amp;loc=d3e8736-108599<br><br>Reference 9: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 42<br> -URI http://asc.fasb.org/extlink&amp;oid=123359005&amp;loc=d3e9054-108599<br><br>Reference 10: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 606<br> -SubTopic 10<br> -Section 50<br> -Paragraph 5<br> -URI http://asc.fasb.org/extlink&amp;oid=123351226&amp;loc=SL49130545-203045<br><br>Reference 11: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 924<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SAB Topic 11.L)<br> -URI http://asc.fasb.org/extlink&amp;oid=6472922&amp;loc=d3e499488-122856<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Average number of shares or units issued and outstanding that are used in calculating basic and diluted earnings per share (EPS).</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
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<head>
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<span style="display: none;">v3.21.2</span><table class="report" border="0" cellspacing="2" id="idm140561284705016">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Condensed Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($)<br></strong></div></th>
<th class="th" colspan="2">3 Months Ended</th>
<th class="th" colspan="2">6 Months Ended</th>
</tr>
<tr>
<th class="th"><div>Jun. 30, 2021</div></th>
<th class="th"><div>Jun. 30, 2020</div></th>
<th class="th"><div>Jun. 30, 2021</div></th>
<th class="th"><div>Jun. 30, 2020</div></th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParentAbstract', window );"><strong>Changes in:</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax', window );">Realized gains (losses) on debt securities recognized in investment income, net</a></td>
<td class="nump">$ 1,785<span></span>
</td>
<td class="num">$ (2,865)<span></span>
</td>
<td class="nump">$ 1,785<span></span>
</td>
<td class="num">$ (46,097)<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax', window );">Unrealized (losses) gains on debt securities, net</a></td>
<td class="num">(7,340)<span></span>
</td>
<td class="nump">6,918<span></span>
</td>
<td class="num">(5,555)<span></span>
</td>
<td class="nump">11,185<span></span>
</td>
</tr>
<tr class="rou">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax', window );">Change in unrealized (losses) gains on available for sale securities, net</a></td>
<td class="num">(5,555)<span></span>
</td>
<td class="nump">4,053<span></span>
</td>
<td class="num">(3,770)<span></span>
</td>
<td class="num">(34,912)<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_NetIncomeLoss', window );">Net loss</a></td>
<td class="num">(5,448,397)<span></span>
</td>
<td class="num">(5,342,935)<span></span>
</td>
<td class="num">(11,137,400)<span></span>
</td>
<td class="num">(10,399,813)<span></span>
</td>
</tr>
<tr class="rou">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ComprehensiveIncomeNetOfTax', window );">Comprehensive loss</a></td>
<td class="num">$ (5,453,952)<span></span>
</td>
<td class="num">$ (5,338,882)<span></span>
</td>
<td class="num">$ (11,141,170)<span></span>
</td>
<td class="num">$ (10,434,725)<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ComprehensiveIncomeNetOfTax">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 944<br> -SubTopic 220<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.7-04(22))<br> -URI http://asc.fasb.org/extlink&amp;oid=120400993&amp;loc=SL114874131-224263<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 220<br> -SubTopic 10<br> -Section S99<br> -Paragraph 2<br> -Subparagraph (SX 210.5-03(24))<br> -URI http://asc.fasb.org/extlink&amp;oid=123367319&amp;loc=SL114868664-224227<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 220<br> -SubTopic 10<br> -Section 45<br> -Paragraph 5<br> -URI http://asc.fasb.org/extlink&amp;oid=124509347&amp;loc=d3e557-108580<br><br>Reference 4: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 942<br> -SubTopic 220<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.9-04(26))<br> -URI http://asc.fasb.org/extlink&amp;oid=120399700&amp;loc=SL114874048-224260<br><br>Reference 5: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 220<br> -SubTopic 10<br> -Section 45<br> -Paragraph 1B<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=124509347&amp;loc=SL7669625-108580<br><br>Reference 6: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 220<br> -SubTopic 10<br> -Section 45<br> -Paragraph 1A<br> -Subparagraph (c)<br> -URI http://asc.fasb.org/extlink&amp;oid=124509347&amp;loc=SL7669619-108580<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ComprehensiveIncomeNetOfTax</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_NetIncomeLoss">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 942<br> -SubTopic 220<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.9-04(22))<br> -URI http://asc.fasb.org/extlink&amp;oid=120399700&amp;loc=SL114874048-224260<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 32<br> -Subparagraph (f)<br> -URI http://asc.fasb.org/extlink&amp;oid=123359005&amp;loc=d3e8933-108599<br><br>Reference 3: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 250<br> -SubTopic 10<br> -Section 50<br> -Paragraph 4<br> -URI 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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_NetIncomeLoss</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParentAbstract">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParentAbstract</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
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<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
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<td><strong> Balance Type:</strong></td>
<td>na</td>
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<td><strong> Period Type:</strong></td>
<td>duration</td>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount, after tax and adjustment, of unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) and unrealized gain (loss) on investment in debt security measured at amortized cost (held-to-maturity) from transfer to available-for-sale.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 220<br> -SubTopic 10<br> -Section 45<br> -Paragraph 10A<br> -Subparagraph (f)<br> -URI http://asc.fasb.org/extlink&amp;oid=124509347&amp;loc=SL7669646-108580<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 220<br> -SubTopic 10<br> -Section 45<br> -Paragraph 11<br> -URI http://asc.fasb.org/extlink&amp;oid=124509347&amp;loc=d3e637-108580<br><br>Reference 3: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 220<br> -SubTopic 10<br> -Section 45<br> -Paragraph 10A<br> -Subparagraph (e)<br> -URI http://asc.fasb.org/extlink&amp;oid=124509347&amp;loc=SL7669646-108580<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax</td>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount after tax of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 220<br> -SubTopic 10<br> -Section 45<br> -Paragraph 15<br> -URI http://asc.fasb.org/extlink&amp;oid=124509347&amp;loc=d3e689-108580<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 220<br> -SubTopic 10<br> -Section 45<br> -Paragraph 11<br> -URI http://asc.fasb.org/extlink&amp;oid=124509347&amp;loc=d3e637-108580<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 320<br> -SubTopic 10<br> -Section 50<br> -Paragraph 9<br> -Subparagraph (d)<br> -URI http://asc.fasb.org/extlink&amp;oid=123581744&amp;loc=d3e27357-111563<br><br>Reference 4: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 220<br> -SubTopic 10<br> -Section 45<br> -Paragraph 17A<br> -URI http://asc.fasb.org/extlink&amp;oid=124509347&amp;loc=SL34724391-108580<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax</td>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount, after tax and before adjustment, of unrealized holding gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Excludes unrealized gain (loss) on investment in debt security measured at amortized cost (held-to-maturity) from transfer to available-for-sale.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 220<br> -SubTopic 10<br> -Section 45<br> -Paragraph 10A<br> -Subparagraph (e)<br> -URI http://asc.fasb.org/extlink&amp;oid=124509347&amp;loc=SL7669646-108580<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 220<br> -SubTopic 10<br> -Section 45<br> -Paragraph 11<br> -URI http://asc.fasb.org/extlink&amp;oid=124509347&amp;loc=d3e637-108580<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
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<td style="white-space:nowrap;">us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax</td>
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<span style="display: none;">v3.21.2</span><table class="report" border="0" cellspacing="2" id="idm140561284457784">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)<br></strong></div></th>
<th class="th" colspan="2">3 Months Ended</th>
<th class="th" colspan="2">6 Months Ended</th>
<th class="th" colspan="1">12 Months Ended</th>
</tr>
<tr>
<th class="th"><div>Jun. 30, 2021</div></th>
<th class="th"><div>Jun. 30, 2020</div></th>
<th class="th"><div>Jun. 30, 2021</div></th>
<th class="th"><div>Jun. 30, 2020</div></th>
<th class="th"><div>Dec. 31, 2020</div></th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract', window );"><strong>Cash flows from operating activities:</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_NetIncomeLoss', window );">Net loss</a></td>
<td class="num">$ (5,448,397)<span></span>
</td>
<td class="num">$ (5,342,935)<span></span>
</td>
<td class="num">$ (11,137,400)<span></span>
</td>
<td class="num">$ (10,399,813)<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract', window );"><strong>Adjustments to reconcile net loss to net cash used in operating activities:</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_DepreciationDepletionAndAmortization', window );">Depreciation and amortization</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">383,801<span></span>
</td>
<td class="nump">378,990<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_GainLossFromChangeInEarnoutMilestoneLiability', window );">Change in fair value of earn-out milestone liability</a></td>
<td class="num">(81,000)<span></span>
</td>
<td class="nump">256,296<span></span>
</td>
<td class="nump">70,000<span></span>
</td>
<td class="nump">297,570<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ContractWithCustomerLiabilityRevenueRecognized', window );">Recognition of deferred revenue</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="num">(250,000)<span></span>
</td>
<td class="num">(250,000)<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensation', window );">Stock-based compensation costs</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">2,372,945<span></span>
</td>
<td class="nump">1,030,726<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_DeferredIncomeTaxExpenseBenefit', window );">Deferred income tax asset</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">1,845,823<span></span>
</td>
<td class="nump">1,819,324<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_AmortizationOfDeferredFinanceChargesAndDebtDiscountAssociatedWithNotePayable', window );">Amortization of deferred finance charges and debt discount associated with notes payable</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">145,884<span></span>
</td>
<td class="nump">192,793<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract', window );"><strong>Net changes in:</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_IncreaseDecreaseInAccruedInvestmentIncomeReceivable', window );">Accrued interest on investment securities</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="num">(105,000)<span></span>
</td>
<td class="nump">13,503<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets', window );">Advances, deposits, and other current assets</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="num">(183,756)<span></span>
</td>
<td class="num">(60,104)<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities', window );">Accounts payable and accrued liabilities</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="num">(491,694)<span></span>
</td>
<td class="num">(946,265)<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rou">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_NetCashProvidedByUsedInOperatingActivities', window );">Net cash used in operating activities</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="num">(7,349,397)<span></span>
</td>
<td class="num">(7,923,276)<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract', window );"><strong>Cash flows from investing activities:</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt', window );">Purchases of investment securities</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="num">(40,927,055)<span></span>
</td>
<td class="num">(9,940,894)<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities', window );">Proceeds from sale and maturity of investment securities</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">9,000,000<span></span>
</td>
<td class="nump">15,100,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment', window );">Purchases of property and equipment</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="num">(227,000)<span></span>
</td>
<td class="num">(11,837)<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="reu">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_NetCashProvidedByUsedInInvestingActivities', window );">Net cash (used in) provided by investing activities</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="num">(32,154,055)<span></span>
</td>
<td class="nump">5,147,269<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract', window );"><strong>Cash flows from financing activities:</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ProceedsFromIssuanceOfCommonStock', window );">Proceeds from sale of common stock equity, net of issuance costs</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">52,697,265<span></span>
</td>
<td class="nump">18,182,599<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_ProceedsFromIssuanceOfCommonStockUponConversionOfStockWarrants', window );">Proceeds from issuance of common stock upon conversion of stock warrants</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">1,508,666<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_ProceedsFromIssuanceOfCommonStockUponConversionOfStockOptions', window );">Proceeds from issuance of common stock upon conversion of stock options</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">4,725<span></span>
</td>
<td class="nump">371,895<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ProceedsFromIssuanceOfLongTermDebt', window );">Proceeds from the SVB Loan Facility, net of issuance costs</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">5,756,630<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_RepaymentsOfLongTermDebt', window );">Payoff of the Horizon Credit Agreement and accrued end of term fees</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="num">(5,190,587)<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ProceedsFromIssuanceOfDebt', window );">Proceeds from Payroll Protection Program (PPP) loans</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">1,324,750<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_RepaymentsOfDebt', window );">Repayments on Payroll Protection Program (PPP) loans</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="num">(1,324,750)<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rou">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_NetCashProvidedByUsedInFinancingActivities', window );">Net cash provided by financing activities</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">54,776,699<span></span>
</td>
<td class="nump">18,554,494<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="reu">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect', window );">Increase in cash, cash equivalents and restricted cash</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">15,273,247<span></span>
</td>
<td class="nump">15,778,487<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations', window );">Cash, cash equivalents and restricted cash at beginning of period</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">17,164,177<span></span>
</td>
<td class="nump">6,875,273<span></span>
</td>
<td class="nump">$ 6,875,273<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations', window );">Cash, cash equivalents and restricted cash at end of period</a></td>
<td class="nump">$ 32,437,424<span></span>
</td>
<td class="nump">$ 22,653,760<span></span>
</td>
<td class="nump">32,437,424<span></span>
</td>
<td class="nump">22,653,760<span></span>
</td>
<td class="nump">$ 17,164,177<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SupplementalCashFlowInformationAbstract', window );"><strong>Supplemental disclosures of cash flow information:</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_InterestPaidNet', window );">Interest paid</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="num">(267,360)<span></span>
</td>
<td class="num">(487,174)<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract', window );"><strong>Cash paid for amounts included in measurement of lease liabilities:</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OperatingLeasePayments', window );">Operating cash flows from lease payments</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">264,546<span></span>
</td>
<td class="nump">262,084<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockIssued1', window );">Common stock issued to settle accrued bonuses</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">498,632<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_RealizedAndUnrealizedGainsAndLossesNetOnInvestmentInDebtSecurities', window );">Realized and unrealized gains (losses), net, on investment securities</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 3,770<span></span>
</td>
<td class="num">$ (34,912)<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_CLSN_AmortizationOfDeferredFinanceChargesAndDebtDiscountAssociatedWithNotePayable">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amortization of deferred finance charges and debt discount associated with note payable.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">CLSN_AmortizationOfDeferredFinanceChargesAndDebtDiscountAssociatedWithNotePayable</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>CLSN_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_CLSN_GainLossFromChangeInEarnoutMilestoneLiability">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Gain (loss) from change in valuation of earn-out milestone liability.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">CLSN_GainLossFromChangeInEarnoutMilestoneLiability</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>CLSN_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_CLSN_ProceedsFromIssuanceOfCommonStockUponConversionOfStockOptions">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Proceeds from issuance of common stock upon conversion of stock options.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">CLSN_ProceedsFromIssuanceOfCommonStockUponConversionOfStockOptions</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>CLSN_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_CLSN_ProceedsFromIssuanceOfCommonStockUponConversionOfStockWarrants">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Proceeds from issuance of common stock upon conversion of stock warrants.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">CLSN_ProceedsFromIssuanceOfCommonStockUponConversionOfStockWarrants</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>CLSN_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_CLSN_RealizedAndUnrealizedGainsAndLossesNetOnInvestmentInDebtSecurities">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Realized and unrealized (gains) and losses, net, on investment in debt securities.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">CLSN_RealizedAndUnrealizedGainsAndLossesNetOnInvestmentInDebtSecurities</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>CLSN_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; including, but not limited to, disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 50<br> -Paragraph 8<br> -URI http://asc.fasb.org/extlink&amp;oid=123431023&amp;loc=SL98516268-108586<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 24<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3521-108585<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 4<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3044-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of increase (decrease) in cash, cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; including effect from exchange rate change. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 830<br> -SubTopic 230<br> -Section 45<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=123444420&amp;loc=d3e33268-110906<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 24<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3521-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ContractWithCustomerLiabilityRevenueRecognized">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 606<br> -SubTopic 10<br> -Section 50<br> -Paragraph 8<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=123351226&amp;loc=SL49130549-203045<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ContractWithCustomerLiabilityRevenueRecognized</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_DeferredIncomeTaxExpenseBenefit">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 740<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SAB Topic 6.I.7)<br> -URI http://asc.fasb.org/extlink&amp;oid=122134291&amp;loc=d3e330036-122817<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 740<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SAB Topic 6.I.Fact.1)<br> -URI http://asc.fasb.org/extlink&amp;oid=122134291&amp;loc=d3e330036-122817<br><br>Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 235<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.4-08(h)(1)(Note 1))<br> -URI http://asc.fasb.org/extlink&amp;oid=120395691&amp;loc=d3e23780-122690<br><br>Reference 4: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 740<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SAB Topic 6.I.Fact.2)<br> -URI http://asc.fasb.org/extlink&amp;oid=122134291&amp;loc=d3e330036-122817<br><br>Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 28<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3602-108585<br><br>Reference 6: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 740<br> -SubTopic 10<br> -Section 50<br> -Paragraph 9<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=121826272&amp;loc=d3e32639-109319<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_DeferredIncomeTaxExpenseBenefit</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_DepreciationDepletionAndAmortization">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 22<br> -Subparagraph (e)<br> -URI http://asc.fasb.org/extlink&amp;oid=123359005&amp;loc=d3e8736-108599<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 28<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3602-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_DepreciationDepletionAndAmortization</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The increase (decrease) during the reporting period in the amounts payable to vendors for goods and services received and the amount of obligations and expenses incurred but not paid.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 28<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3602-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_IncreaseDecreaseInAccruedInvestmentIncomeReceivable">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The increase (decrease) during the reporting period in investment income that has been earned but not yet received in cash.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 28<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3602-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_IncreaseDecreaseInAccruedInvestmentIncomeReceivable</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_IncreaseDecreaseInOperatingCapitalAbstract</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of increase (decrease) in prepaid expenses, and assets classified as other.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 28<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3602-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_InterestPaidNet">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of cash paid for interest, excluding capitalized interest, classified as operating activity. Includes, but is not limited to, payment to settle zero-coupon bond for accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -URI http://asc.fasb.org/extlink&amp;oid=123431023&amp;loc=d3e4297-108586<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 17<br> -Subparagraph (d)<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3367-108585<br><br>Reference 3: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 25<br> -Subparagraph (e)<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3536-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_InterestPaidNet</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_NetCashProvidedByUsedInFinancingActivities">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 24<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3521-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_NetCashProvidedByUsedInFinancingActivities</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_NetCashProvidedByUsedInInvestingActivities">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 24<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3521-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_NetCashProvidedByUsedInInvestingActivities</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_NetCashProvidedByUsedInOperatingActivities">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 25<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3536-108585<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 24<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3521-108585<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 28<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3602-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_NetCashProvidedByUsedInOperatingActivities</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
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<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_NetIncomeLoss">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 942<br> -SubTopic 220<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.9-04(22))<br> -URI http://asc.fasb.org/extlink&amp;oid=120399700&amp;loc=SL114874048-224260<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 32<br> -Subparagraph (f)<br> -URI http://asc.fasb.org/extlink&amp;oid=123359005&amp;loc=d3e8933-108599<br><br>Reference 3: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 250<br> -SubTopic 10<br> -Section 50<br> -Paragraph 4<br> -URI 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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_NetIncomeLoss</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_OperatingLeasePayments">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -Section 45<br> -Paragraph 5<br> -Subparagraph (c)<br> -URI http://asc.fasb.org/extlink&amp;oid=123391704&amp;loc=SL77918643-209977<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -Section 50<br> -Paragraph 4<br> -Subparagraph (g)(1)<br> -URI http://asc.fasb.org/extlink&amp;oid=123408670&amp;loc=SL77918686-209980<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_OperatingLeasePayments</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of cash outflow to acquire investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 13<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3213-108585<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 11<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3151-108585<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 320<br> -SubTopic 10<br> -Section 45<br> -Paragraph 11<br> -URI http://asc.fasb.org/extlink&amp;oid=124260329&amp;loc=d3e26853-111562<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 13<br> -Subparagraph (c)<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3213-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_PaymentsToAcquirePropertyPlantAndEquipment</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ProceedsFromIssuanceOfCommonStock">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The cash inflow from the additional capital contribution to the entity.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 14<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3255-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ProceedsFromIssuanceOfCommonStock</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ProceedsFromIssuanceOfDebt">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 14<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3255-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ProceedsFromIssuanceOfDebt</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ProceedsFromIssuanceOfLongTermDebt">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 14<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3255-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ProceedsFromIssuanceOfLongTermDebt</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of cash inflow from sale, maturity, prepayment and call of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 11<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3151-108585<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 12<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3179-108585<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 320<br> -SubTopic 10<br> -Section 45<br> -Paragraph 11<br> -URI http://asc.fasb.org/extlink&amp;oid=124260329&amp;loc=d3e26853-111562<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_RepaymentsOfDebt">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 15<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3291-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_RepaymentsOfDebt</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_RepaymentsOfLongTermDebt">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 15<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3291-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_RepaymentsOfLongTermDebt</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
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<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
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<tr>
<td><strong> Balance Type:</strong></td>
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<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ShareBasedCompensation">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of noncash expense for share-based payment arrangement.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 28<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3602-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensation</td>
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<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
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<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_StockIssued1">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The fair value of stock issued in noncash financing activities.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 50<br> -Paragraph 3<br> -URI http://asc.fasb.org/extlink&amp;oid=123431023&amp;loc=d3e4304-108586<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 50<br> -Paragraph 5<br> -URI http://asc.fasb.org/extlink&amp;oid=123431023&amp;loc=d3e4332-108586<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 50<br> -Paragraph 4<br> -URI http://asc.fasb.org/extlink&amp;oid=123431023&amp;loc=d3e4313-108586<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_StockIssued1</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_SupplementalCashFlowInformationAbstract</td>
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<td>us-gaap_</td>
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<td>xbrli:stringItemType</td>
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<span style="display: none;">v3.21.2</span><table class="report" border="0" cellspacing="2" id="idm140561283937624">
<tr>
<th class="tl" colspan="1" rowspan="1"><div style="width: 200px;"><strong>Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($)<br></strong></div></th>
<th class="th"><div>Common Stock [Member]</div></th>
<th class="th"><div>Additional Paid-in Capital [Member]</div></th>
<th class="th"><div>Treasury Stock [Member]</div></th>
<th class="th"><div>AOCI Attributable to Parent [Member]</div></th>
<th class="th"><div>Retained Earnings [Member]</div></th>
<th class="th"><div>Total</div></th>
</tr>
<tr class="rc">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockholdersEquity', window );">Beginning balance, value at Dec. 31, 2019</a></td>
<td class="nump">$ 232,562<span></span>
</td>
<td class="nump">$ 304,885,663<span></span>
</td>
<td class="num">$ (85,188)<span></span>
</td>
<td class="nump">$ 42,778<span></span>
</td>
<td class="num">$ (290,516,780)<span></span>
</td>
<td class="nump">$ 14,559,035<span></span>
</td>
</tr>
<tr class="rc">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SharesOutstanding', window );">Balance, shares at Dec. 31, 2019</a></td>
<td class="nump">23,255,818<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">334<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_NetIncomeLoss', window );">Net loss</a></td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="num">(10,399,813)<span></span>
</td>
<td class="num">(10,399,813)<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockIssuedDuringPeriodValueNewIssues', window );">Sale of equity through equity financing facilities</a></td>
<td class="nump">$ 94,027<span></span>
</td>
<td class="nump">18,088,572<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">18,182,599<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockIssuedDuringPeriodSharesNewIssues', window );">Sale of equity through equity financing facilities net of fees, shares</a></td>
<td class="nump">9,402,843<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent', window );">Realized and unrealized gains and losses, net, on investments securities</a></td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="num">(34,912)<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="num">(34,912)<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_IssuanceOfCommonStockUponExerciseOfOptions', window );">Issuance of common stock upon exercise of options</a></td>
<td class="nump">$ 1,409<span></span>
</td>
<td class="nump">370,486<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">371,895<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_IssuanceOfCommonStockUponExerciseOfOptionsShares', window );">Issuance of common stock upon exercise of options, shares</a></td>
<td class="nump">140,864<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockIssuedDuringPeriodValueOther', window );">Common stock issued to settle accrued bonuses</a></td>
<td class="nump">$ 4,299<span></span>
</td>
<td class="nump">494,333<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">$ 498,632<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockIssuedDuringPeriodSharesOther', window );">?Common stock issued to settle accrued bonuses, shares</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">429,855<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue', window );">Stock-based compensation expense</a></td>
<td class="text"> <span></span>
</td>
<td class="nump">1,030,726<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">$ 1,030,726<span></span>
</td>
</tr>
<tr class="rc">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockholdersEquity', window );">Ending balance, value at Jun. 30, 2020</a></td>
<td class="nump">$ 332,297<span></span>
</td>
<td class="nump">324,869,780<span></span>
</td>
<td class="num">$ (85,188)<span></span>
</td>
<td class="nump">7,866<span></span>
</td>
<td class="num">(300,916,593)<span></span>
</td>
<td class="nump">24,208,162<span></span>
</td>
</tr>
<tr class="rc">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SharesOutstanding', window );">Balance, shares at Jun. 30, 2020</a></td>
<td class="nump">33,229,380<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">334<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rc">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockholdersEquity', window );">Beginning balance, value at Dec. 31, 2019</a></td>
<td class="nump">$ 232,562<span></span>
</td>
<td class="nump">304,885,663<span></span>
</td>
<td class="num">$ (85,188)<span></span>
</td>
<td class="nump">42,778<span></span>
</td>
<td class="num">(290,516,780)<span></span>
</td>
<td class="nump">14,559,035<span></span>
</td>
</tr>
<tr class="rc">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SharesOutstanding', window );">Balance, shares at Dec. 31, 2019</a></td>
<td class="nump">23,255,818<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">334<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rc">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockholdersEquity', window );">Ending balance, value at Dec. 31, 2020</a></td>
<td class="nump">$ 407,014<span></span>
</td>
<td class="nump">330,289,596<span></span>
</td>
<td class="num">$ (85,188)<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="num">(312,000,341)<span></span>
</td>
<td class="nump">18,611,081<span></span>
</td>
</tr>
<tr class="rc">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SharesOutstanding', window );">Balance, shares at Dec. 31, 2020</a></td>
<td class="nump">40,701,022<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">334<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rc">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockholdersEquity', window );">Beginning balance, value at Mar. 31, 2020</a></td>
<td class="nump">$ 292,574<span></span>
</td>
<td class="nump">311,570,995<span></span>
</td>
<td class="num">$ (85,188)<span></span>
</td>
<td class="nump">3,813<span></span>
</td>
<td class="num">(295,573,658)<span></span>
</td>
<td class="nump">16,208,536<span></span>
</td>
</tr>
<tr class="rc">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SharesOutstanding', window );">Balance, shares at Mar. 31, 2020</a></td>
<td class="nump">29,257,101<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">334<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_NetIncomeLoss', window );">Net loss</a></td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="num">(5,342,935)<span></span>
</td>
<td class="num">(5,342,935)<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockIssuedDuringPeriodValueNewIssues', window );">Sale of equity through equity financing facilities</a></td>
<td class="nump">$ 38,314<span></span>
</td>
<td class="nump">12,349,538<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">12,387,852<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockIssuedDuringPeriodSharesNewIssues', window );">Sale of equity through equity financing facilities net of fees, shares</a></td>
<td class="nump">3,831,415<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent', window );">Realized and unrealized gains and losses, net, on investments securities</a></td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">4,053<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">4,053<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_IssuanceOfCommonStockUponExerciseOfOptions', window );">Issuance of common stock upon exercise of options</a></td>
<td class="nump">$ 1,409<span></span>
</td>
<td class="nump">370,486<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">371,895<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_IssuanceOfCommonStockUponExerciseOfOptionsShares', window );">Issuance of common stock upon exercise of options, shares</a></td>
<td class="nump">140,864<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue', window );">Stock-based compensation expense</a></td>
<td class="text"> <span></span>
</td>
<td class="nump">578,761<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">578,761<span></span>
</td>
</tr>
<tr class="rc">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockholdersEquity', window );">Ending balance, value at Jun. 30, 2020</a></td>
<td class="nump">$ 332,297<span></span>
</td>
<td class="nump">324,869,780<span></span>
</td>
<td class="num">$ (85,188)<span></span>
</td>
<td class="nump">7,866<span></span>
</td>
<td class="num">(300,916,593)<span></span>
</td>
<td class="nump">24,208,162<span></span>
</td>
</tr>
<tr class="rc">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SharesOutstanding', window );">Balance, shares at Jun. 30, 2020</a></td>
<td class="nump">33,229,380<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">334<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rc">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockholdersEquity', window );">Beginning balance, value at Dec. 31, 2020</a></td>
<td class="nump">$ 407,014<span></span>
</td>
<td class="nump">330,289,596<span></span>
</td>
<td class="num">$ (85,188)<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="num">(312,000,341)<span></span>
</td>
<td class="nump">18,611,081<span></span>
</td>
</tr>
<tr class="rc">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SharesOutstanding', window );">Balance, shares at Dec. 31, 2020</a></td>
<td class="nump">40,701,022<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">334<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rc">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockholdersEquity', window );">Ending balance, value at Mar. 31, 2021</a></td>
<td class="nump">$ 750,196<span></span>
</td>
<td class="nump">371,982,609<span></span>
</td>
<td class="num">$ (85,188)<span></span>
</td>
<td class="nump">1,785<span></span>
</td>
<td class="num">(317,689,344)<span></span>
</td>
<td class="nump">54,960,058<span></span>
</td>
</tr>
<tr class="rc">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SharesOutstanding', window );">Balance, shares at Mar. 31, 2021</a></td>
<td class="nump">75,019,274<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">334<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rc">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockholdersEquity', window );">Beginning balance, value at Dec. 31, 2020</a></td>
<td class="nump">$ 407,014<span></span>
</td>
<td class="nump">330,289,596<span></span>
</td>
<td class="num">$ (85,188)<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="num">(312,000,341)<span></span>
</td>
<td class="nump">18,611,081<span></span>
</td>
</tr>
<tr class="rc">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SharesOutstanding', window );">Balance, shares at Dec. 31, 2020</a></td>
<td class="nump">40,701,022<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">334<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_NetIncomeLoss', window );">Net loss</a></td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="num">(11,137,400)<span></span>
</td>
<td class="num">(11,137,400)<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockIssuedDuringPeriodValueNewIssues', window );">Sale of equity through equity financing facilities</a></td>
<td class="nump">$ 446,326<span></span>
</td>
<td class="nump">52,250,939<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">52,697,265<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockIssuedDuringPeriodSharesNewIssues', window );">Sale of equity through equity financing facilities net of fees, shares</a></td>
<td class="nump">44,632,547<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_StockIssuedUponExerciseOfCommonStockWarrants', window );">Shares issued upon exercise of common stock warrants, net of fees</a></td>
<td class="nump">$ 12,166<span></span>
</td>
<td class="nump">1,496,500<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">1,508,666<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_StockIssuedUponExerciseOfCommonStockWarrantsShares', window );">Shares issued upon exercise of common stock warrants, net of fees, shares</a></td>
<td class="nump">1,216,667<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised', window );">Shares issued upon exercise of options to purchase common stock</a></td>
<td class="nump">$ 75<span></span>
</td>
<td class="nump">4,650<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">4,725<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised', window );">Shares issued upon exercise of options to purchase common stock, shares</a></td>
<td class="nump">7,500<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent', window );">Realized and unrealized gains and losses, net, on investments securities</a></td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="num">(3,770)<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="num">(3,770)<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue', window );">Stock-based compensation expense</a></td>
<td class="text"> <span></span>
</td>
<td class="nump">2,372,945<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">2,372,945<span></span>
</td>
</tr>
<tr class="rc">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockholdersEquity', window );">Ending balance, value at Jun. 30, 2021</a></td>
<td class="nump">$ 865,581<span></span>
</td>
<td class="nump">386,414,630<span></span>
</td>
<td class="num">$ (85,188)<span></span>
</td>
<td class="num">(3,770)<span></span>
</td>
<td class="num">(323,137,741)<span></span>
</td>
<td class="nump">64,053,512<span></span>
</td>
</tr>
<tr class="rc">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SharesOutstanding', window );">Balance, shares at Jun. 30, 2021</a></td>
<td class="nump">86,557,736<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">334<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rc">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockholdersEquity', window );">Beginning balance, value at Mar. 31, 2021</a></td>
<td class="nump">$ 750,196<span></span>
</td>
<td class="nump">371,982,609<span></span>
</td>
<td class="num">$ (85,188)<span></span>
</td>
<td class="nump">1,785<span></span>
</td>
<td class="num">(317,689,344)<span></span>
</td>
<td class="nump">54,960,058<span></span>
</td>
</tr>
<tr class="rc">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SharesOutstanding', window );">Balance, shares at Mar. 31, 2021</a></td>
<td class="nump">75,019,274<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">334<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_NetIncomeLoss', window );">Net loss</a></td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="num">(5,448,397)<span></span>
</td>
<td class="num">(5,448,397)<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockIssuedDuringPeriodValueNewIssues', window );">Sale of equity through equity financing facilities</a></td>
<td class="nump">$ 115,385<span></span>
</td>
<td class="nump">13,638,402<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">13,753,787<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockIssuedDuringPeriodSharesNewIssues', window );">Sale of equity through equity financing facilities net of fees, shares</a></td>
<td class="nump">11,538,462<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent', window );">Realized and unrealized gains and losses, net, on investments securities</a></td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="num">(5,555)<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="num">(5,555)<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue', window );">Stock-based compensation expense</a></td>
<td class="text"> <span></span>
</td>
<td class="nump">793,619<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">793,619<span></span>
</td>
</tr>
<tr class="rc">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockholdersEquity', window );">Ending balance, value at Jun. 30, 2021</a></td>
<td class="nump">$ 865,581<span></span>
</td>
<td class="nump">$ 386,414,630<span></span>
</td>
<td class="num">$ (85,188)<span></span>
</td>
<td class="num">$ (3,770)<span></span>
</td>
<td class="num">$ (323,137,741)<span></span>
</td>
<td class="nump">$ 64,053,512<span></span>
</td>
</tr>
<tr class="rc">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SharesOutstanding', window );">Balance, shares at Jun. 30, 2021</a></td>
<td class="nump">86,557,736<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">334<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_CLSN_IssuanceOfCommonStockUponExerciseOfOptions">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Issuance of common stock upon exercise of options.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">CLSN_IssuanceOfCommonStockUponExerciseOfOptions</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>CLSN_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_CLSN_IssuanceOfCommonStockUponExerciseOfOptionsShares">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Issuance of common stock upon exercise of options, shares.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">CLSN_IssuanceOfCommonStockUponExerciseOfOptionsShares</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>CLSN_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_CLSN_StockIssuedUponExerciseOfCommonStockWarrants">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Shares issued upon exercise of common stock warrants, net of fees.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">CLSN_StockIssuedUponExerciseOfCommonStockWarrants</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>CLSN_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_CLSN_StockIssuedUponExerciseOfCommonStockWarrantsShares">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Shares issued upon exercise of common stock warrants, net of fees, shares.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">CLSN_StockIssuedUponExerciseOfCommonStockWarrantsShares</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>CLSN_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of increase to additional paid-in capital (APIC) for recognition of cost for award under share-based payment arrangement.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 20<br> -Section 55<br> -Paragraph 12<br> -URI http://asc.fasb.org/extlink&amp;oid=122142933&amp;loc=d3e11149-113907<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 1<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5047-113901<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 20<br> -Section 55<br> -Paragraph 13<br> -URI http://asc.fasb.org/extlink&amp;oid=122142933&amp;loc=d3e11178-113907<br><br>Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 35<br> -Paragraph 2<br> -URI http://asc.fasb.org/extlink&amp;oid=123468992&amp;loc=d3e4534-113899<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_NetIncomeLoss">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.</p></div>
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http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 22<br> -URI http://asc.fasb.org/extlink&amp;oid=123359005&amp;loc=d3e8736-108599<br><br>Reference 31: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1A<br> -Subparagraph (SX 210.13-01(a)(5))<br> -URI http://asc.fasb.org/extlink&amp;oid=124359900&amp;loc=SL124442526-122756<br><br>Reference 32: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1B<br> -Subparagraph (SX 210.13-02(a)(4)(iii)(B))<br> -URI http://asc.fasb.org/extlink&amp;oid=124359900&amp;loc=SL124442552-122756<br><br>Reference 33: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1B<br> -Subparagraph (SX 210.13-02(a)(4)(iii)(A))<br> -URI http://asc.fasb.org/extlink&amp;oid=124359900&amp;loc=SL124442552-122756<br><br>Reference 34: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 30<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=123359005&amp;loc=d3e8906-108599<br><br>Reference 35: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 32<br> -Subparagraph (c)<br> -URI http://asc.fasb.org/extlink&amp;oid=123359005&amp;loc=d3e8933-108599<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_NetIncomeLoss</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount after tax of other comprehensive income (loss) attributable to parent entity.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 220<br> -SubTopic 10<br> -Section 45<br> -Paragraph 1B<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=124509347&amp;loc=SL7669625-108580<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 810<br> -SubTopic 10<br> -Section 50<br> -Paragraph 1A<br> -Subparagraph (c)(3)<br> -URI http://asc.fasb.org/extlink&amp;oid=109239629&amp;loc=SL4573702-111684<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 810<br> -SubTopic 10<br> -Section 45<br> -Paragraph 20<br> -URI http://asc.fasb.org/extlink&amp;oid=123454820&amp;loc=SL4569643-111683<br><br>Reference 4: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 220<br> -SubTopic 10<br> -Section 45<br> -Paragraph 1A<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=124509347&amp;loc=SL7669619-108580<br><br>Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 810<br> -SubTopic 10<br> -Section 45<br> -Paragraph 19<br> -URI http://asc.fasb.org/extlink&amp;oid=123454820&amp;loc=SL4569616-111683<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_SharesOutstanding">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Number of shares issued which are neither cancelled nor held in the treasury.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_SharesOutstanding</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_StockIssuedDuringPeriodSharesNewIssues">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Number of new stock issued during the period.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(29))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -URI http://asc.fasb.org/extlink&amp;oid=123467817&amp;loc=d3e21463-112644<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.3-04)<br> -URI http://asc.fasb.org/extlink&amp;oid=120397183&amp;loc=d3e187085-122770<br><br>Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(28))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_StockIssuedDuringPeriodSharesNewIssues</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_StockIssuedDuringPeriodSharesOther">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Number of shares of stock issued attributable to transactions classified as other.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_StockIssuedDuringPeriodSharesOther</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Number of share options (or share units) exercised during the current period.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (c)(1)(iv)(2)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.3-04)<br> -URI http://asc.fasb.org/extlink&amp;oid=120397183&amp;loc=d3e187085-122770<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(28))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(29))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -URI http://asc.fasb.org/extlink&amp;oid=123467817&amp;loc=d3e21463-112644<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_StockIssuedDuringPeriodValueNewIssues">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Equity impact of the value of new stock issued during the period. Includes shares issued in an initial public offering or a secondary public offering.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.3-04)<br> -URI http://asc.fasb.org/extlink&amp;oid=120397183&amp;loc=d3e187085-122770<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -URI http://asc.fasb.org/extlink&amp;oid=123467817&amp;loc=d3e21463-112644<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(29))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(28))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_StockIssuedDuringPeriodValueNewIssues</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_StockIssuedDuringPeriodValueOther">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Value of shares of stock issued attributable to transactions classified as other.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_StockIssuedDuringPeriodValueOther</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
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<span style="display: none;">v3.21.2</span><table class="report" border="0" cellspacing="2" id="idm140561288504904">
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<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Business Description<br></strong></div></th>
<th class="th" colspan="1">6 Months Ended</th>
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<tr><th class="th"><div>Jun. 30, 2021</div></th></tr>
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<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AccountingPoliciesAbstract', window );"><strong>Accounting Policies [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Celsion
Corporation (&#8220;Celsion&#8221; and the &#8220;Company&#8221;) is a fully integrated, clinical stage biotechnology company focused
on advancing a portfolio of innovative treatments including DNA-based immunotherapies, next generation vaccines and directed chemotherapies
through clinical trials and eventual commercialization. The Company&#8217;s product pipeline includes GEN-1, a DNA-based immunotherapy
for the localized treatment of ovarian cancer and ThermoDox<sup>&#174;</sup>, a proprietary heat-activated liposomal encapsulation of
doxorubicin, currently under investigator-sponsored development for several cancer indications. Celsion has two feasibility stage platform
technologies for the development of novel nucleic acid-based immunotherapies and next generation vaccines and other anti-cancer DNA or
RNA therapies. Both are novel synthetic, non-viral vectors with demonstrated capability in nucleic acid cellular transfection.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<span></span>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The entire disclosure for the business description and accounting policies concepts.  Business description describes the nature and type of organization including but not limited to organizational structure as may be applicable to holding companies, parent and subsidiary relationships, business divisions, business units, business segments, affiliates and information about significant ownership of the reporting entity. Accounting policies describe all significant accounting policies of the reporting entity.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 275<br> -URI http://asc.fasb.org/topic&amp;trid=2134479<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 235<br> -URI http://asc.fasb.org/topic&amp;trid=2122369<br></p></div>
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<span style="display: none;">v3.21.2</span><table class="report" border="0" cellspacing="2" id="idm140561283041832">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Basis of Presentation<br></strong></div></th>
<th class="th" colspan="1">6 Months Ended</th>
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<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract', window );"><strong>Organization, Consolidation and Presentation of Financial Statements [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">The
accompanying unaudited condensed consolidated financial statements, which include the accounts of the Company and its wholly owned subsidiaries,
CLSN Laboratories, Inc. and Celsion, GmbH, have been prepared in accordance with generally accepted accounting principles
in the United States (GAAP) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X.
All significant intercompany balances and transactions have been eliminated in consolidation. Certain information and disclosures normally
included in financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">In
the opinion of management, all adjustments, consisting only of normal recurring accruals considered necessary for a fair presentation,
have been included in the accompanying unaudited condensed consolidated financial statements. Operating results for the three and six-month
periods June 30, 2021 and 2020 are not necessarily indicative of the results that may be expected for any other interim period(s)
or for any full year. For further information, refer to the financial statements and notes thereto included in the Company&#8217;s Annual
Report on Form 10-K for the fiscal year ended December 31, 2020 filed with the Securities and Exchange Commission (SEC) on March 19,
2021.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">The
preparation of financial statements in conformity with GAAP requires management to make judgments, estimates, and assumptions that affect
the amount reported in the Company&#8217;s financial statements and accompanying notes. Actual results could differ materially from those
estimates. Events and conditions arising subsequent to the most recent balance sheet date have been evaluated for their possible impact
on the financial statements and accompanying notes. The Company continues to monitor the impact of the COVID-19 pandemic on its financial
condition and results of operations, along with the valuation of its long-term assets, intangible assets, and goodwill. The effect of
this matter could potentially have an impact on the valuation of such assets in the future. The COVID-19 pandemic is discussed in more
detail in Note 3 to the financial statements.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<span></span>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The entire disclosure for the basis of accounting, or basis of presentation, used to prepare the financial statements (for example, US Generally Accepted Accounting Principles, Other Comprehensive Basis of Accounting, IFRS).</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 235<br> -URI http://asc.fasb.org/topic&amp;trid=2122369<br></p></div>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
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<span style="display: none;">v3.21.2</span><table class="report" border="0" cellspacing="2" id="idm140561376016296">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Financial Condition and Business Plan<br></strong></div></th>
<th class="th" colspan="1">6 Months Ended</th>
</tr>
<tr><th class="th"><div>Jun. 30, 2021</div></th></tr>
<tr class="re">
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<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SubstantialDoubtAboutGoingConcernTextBlock', window );">Financial Condition and Business Plan</a></td>
<td class="text"><p id="xdx_807_eus-gaap--SubstantialDoubtAboutGoingConcernTextBlock_zv4RrF6zTDT7" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><b>Note
3. <span id="xdx_821_zcInolR5nAVk">Financial Condition and Business Plan</span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Since
inception, the Company has incurred substantial operating losses, principally from expenses associated with the Company&#8217;s research
and development programs, clinical trials conducted in connection with the Company&#8217;s product candidates, and applications and submissions
to the U.S. Food and Drug Administration. The Company has not generated significant revenue and has incurred significant net losses in
each year since our inception. As of June 30, 2021, the Company has incurred approximately $<span id="xdx_90D_eus-gaap--RetainedEarningsAccumulatedDeficit_iNI_pn6n6_di_c20210630_ztG3Q0nMBMe1">323
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million of cumulative net losses and had approximately
$<span id="xdx_90D_ecustom--CashAndCashEquivalentsRestrictedCashShorttermInvestmentsAndReceivableOnSaleOfNetOperatingLosses_iI_pn5n6_c20210630_zk4bgIWIquY2">64.5
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million in cash and cash equivalents, restricted
cash, short-term investments and interest receivable. We have substantial future capital requirements to continue our research
and development activities and advance our product candidates through various development stages. The Company believes these expenditures
are essential for the commercialization of its technologies.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">The
Company expects its operating losses to continue for the foreseeable future as it continues its product development efforts, and when
it undertakes marketing and sales activities. The Company&#8217;s ability to achieve profitability is dependent upon its ability to obtain
governmental approvals, manufacture, and market and sell its product candidates. There can be no assurance that the Company will be able
to commercialize its technology successfully or that profitability will ever be achieved. The operating results of the Company have fluctuated
significantly in the past.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>




<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">In
January 2020, the WHO declared an outbreak of coronavirus, COVID-19, to be a &#8220;Public Health Emergency of International Concern,&#8221;
and the U.S. Department of Health and Human Services declared a public health emergency to aid the U.S. healthcare community in responding
to COVID-19. This virus has spread to over 100 countries, including the U.S. Governments and businesses around the world have taken unprecedented
actions to mitigate the spread of COVID-19, including, but not limited to, shelter-in-place orders, quarantines, significant restrictions
on travel, as well as restrictions that prohibit many employees from going to work. Uncertainty with respect to the economic impacts
of the pandemic has introduced significant volatility in the financial markets. The Company did not observe significant impacts on its
business or results of operations during 2020 and into 2021 due to COVID-19. While the extent to which COVID-19 impacts the Company&#8217;s
future results will depend on future developments, the pandemic and associated economic impacts could result in a material impact to
the Company&#8217;s future financial condition, results of operations and cash flows. The Company&#8217;s ability to raise additional
capital may be adversely impacted by potential worsening global economic conditions and the recent disruptions to, and volatility in,
financial markets in the U.S. and worldwide resulting from the ongoing COVID-19 pandemic. The disruptions caused by COVID-19 may also
disrupt the clinical trials process and enrolment of patients. This may delay commercialization efforts. The Company continues to monitor
its operating activities in light of these events. The specific impact, if any, is not readily determinable as of the date of these financial
statements.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">The
actual amount of funds the Company will need to operate is subject to many factors, some of which are beyond the Company&#8217;s control.
These factors include the following:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; width: 0.5in; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#9679;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">the
    progress of research activities;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#9679;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">the
    number and scope of research programs;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#9679;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">the
    progress of preclinical and clinical development activities;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#9679;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">the
    progress of the development efforts of parties with whom the Company has entered into research and development agreements;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#9679;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">the
    costs associated with additional clinical trials of product candidates;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#9679;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">the
    ability to maintain current research and development licensing arrangements and to establish new research and development and licensing
    arrangements;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#9679;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">the
    ability to achieve milestones under licensing arrangements;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#9679;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">the
    costs involved in prosecuting and enforcing patent claims and other intellectual property rights; and</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#9679;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">the
    costs and timing of regulatory approvals.</span></td></tr>
  </table>
<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">On
July 13, 2020, the Company announced that it has received a recommendation from the independent DMC to consider stopping the global Phase
III OPTIMA Study of ThermoDox<sup>&#174; </sup>in combination with RFA for the treatment of HCC, or primary liver cancer. The recommendation
was made following the second pre-planned interim safety and efficacy analysis by the DMC on July 9, 2020. The DMC&#8217;s analysis found
that the pre-specified boundary for stopping the trial for futility of 0.900 was crossed with an actual value of 0.903. The Company followed
the advice of the DMC and considered its options to either stop the study or continue to follow patients after a thorough review of the
data, and an evaluation of the probability of success. On February 11, 2021, the Company issued a letter to shareholders stating that
the Company was notifying all clinical sites to discontinue following patients in the OPTIMA Study.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">During
2020, 2019 and 2018, the Company submitted applications to sell a portion of the Company&#8217;s State of New Jersey net operating losses
as part of the Technology Business Tax Certificate Program sponsored by The New Jersey Economic Development Authority. Under the program,
emerging biotechnology companies with unused NOLs and unused research and development credits are allowed to sell these benefits to other
New Jersey-based companies. In 2018 and 2019, the Company sold NOLs totaling $<span id="xdx_904_ecustom--NetProceedsFromSaleOfNetOperatingLosses_pn6n6_c20180101__20181231__srt--StatementGeographicalAxis__custom--NJMember_zHT2zFu4X2nj">13
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million receiving net proceeds of $<span id="xdx_90B_ecustom--NetProceedsFromSaleOfNetOperatingLosses_pn5n6_c20190101__20191231__srt--StatementGeographicalAxis__custom--NJMember_z5oV6bjqj5ne">12.2
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million. In June 2020 and as updated in September
2020, the Company filed an application with the New Jersey Economic Development Authority to sell substantially all of its remaining
State of New Jersey net operating losses totaling $<span id="xdx_90C_ecustom--NetProceedsFromSaleOfNetOperatingLosses_pn5n6_c20200901__20200930__srt--StatementGeographicalAxis__custom--NJMember_zpaYoC4lW2z3">2.0
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million available under the program. On February
12, 2021, the New Jersey Economic Development Authority approved the full amount of the Company&#8217;s application. In February of 2021,
the Company entered into an agreement to sell the net operating losses from the 2020 application and the Company received net proceeds
of approximately $<span id="xdx_90E_ecustom--ReceivableOnSaleOfNetOperatingLosses_iI_pn4n6_c20210630_zGqiWGHT1ncg">1.85</span></span>
<span style="font: 10pt Times New Roman, Times, Serif">million on May 10, 2021. During 2021, the New Jersey State
Legislature increased the maximum lifetime benefit per company from $<span id="xdx_90C_ecustom--NetProceedsFromSaleOfNetOperatingLosses_pn6n6_c20210509__20210510__srt--StatementGeographicalAxis__custom--NJMember__srt--RangeAxis__srt--MinimumMember_zyDmUzUgjYo1">15
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million to $<span id="xdx_90E_ecustom--NetProceedsFromSaleOfNetOperatingLosses_pn6n6_c20210509__20210510__srt--StatementGeographicalAxis__custom--NJMember__srt--RangeAxis__srt--MaximumMember_zTnGwnQ5wTN7">20
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million, which will allow the Company to participate
in this innovative funding program in future years. On June 16, 2021, the Company filed another application to sell approximately $<span id="xdx_903_ecustom--NetProceedsFromSaleOfNetOperatingLosses_pn5n6_c20210615__20210616__srt--StatementGeographicalAxis__custom--NJMember_zOrlede95sDf">1.6
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million of net operating losses during 2021
and expects to receive up to approximately $<span id="xdx_908_ecustom--NetProceedsFromSaleOfNetOperatingLosses_pn5n6_c20210615__20210616__srt--StatementGeographicalAxis__custom--NJMember__srt--RangeAxis__srt--MaximumMember_zM14sOMsind">1.4
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million under the current year program.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>




<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">In
June 2018, the Company entered into a Credit Agreement with Horizon Technology Finance Corporation (&#8220;Horizon&#8221;) that provided
$<span id="xdx_902_eus-gaap--ProceedsFromContributedCapital_pn6n6_c20180601__20180630__us-gaap--TypeOfArrangementAxis__custom--HorizonCreditAgreementMember__dei--LegalEntityAxis__custom--HorizonTechnologyFinanceCorporationMember_zdLw2GbVEqGg">10
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million in capital (the &#8220;Horizon Credit
Agreement&#8221;). The obligations under the Horizon Credit Agreement are secured by a first-priority security interest in substantially
all assets of Celsion other than intellectual property assets. Payments under the loan agreement are interest only (calculated based
on one-month LIBOR plus <span id="xdx_90D_eus-gaap--DebtInstrumentInterestRateStatedPercentage_iI_pid_dp_uPercentage_c20180630__us-gaap--TypeOfArrangementAxis__custom--HorizonCreditAgreementMember__dei--LegalEntityAxis__custom--HorizonTechnologyFinanceCorporationMember__us-gaap--VariableRateAxis__us-gaap--LondonInterbankOfferedRateLIBORMember_zVwTUEla0Zqh">7.625</span></span><span style="font: 10pt Times New Roman, Times, Serif">%)
for the first 24 months through July 2020, followed by a 21-month amortization period of principal and interest starting on August 1,
2020 and ending through the scheduled maturity date on April 1, 2023. On August 28, 2020, in connection with an Amendment to the Horizon
Credit Agreement, Celsion repaid $<span id="xdx_90E_eus-gaap--RepaymentsOfNotesPayable_pn6n6_c20200827__20200828__us-gaap--TypeOfArrangementAxis__custom--AmendmentToHorizonCreditAgreementMember__dei--LegalEntityAxis__custom--HorizonTechnologyFinanceCorporationMember_zQaoltFZ080c">5
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million of the $<span id="xdx_907_eus-gaap--DebtInstrumentFaceAmount_iI_pn6n6_c20200828__us-gaap--TypeOfArrangementAxis__custom--HorizonCreditAgreementMember__dei--LegalEntityAxis__custom--HorizonTechnologyFinanceCorporationMember_zJqDwhPMg24e">10
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million loan and $<span id="xdx_902_ecustom--PaymentOfDebtEndTermCharges_pn5n6_c20200827__20200828__us-gaap--TypeOfArrangementAxis__custom--AmendmentToHorizonCreditAgreementMember__dei--LegalEntityAxis__custom--HorizonTechnologyFinanceCorporationMember_z5f0yRKT1L5k">0.2
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million in related end of term charges, and the
remaining $<span id="xdx_90E_eus-gaap--DebtInstrumentFaceAmount_iI_pn6n6_c20200828__us-gaap--TypeOfArrangementAxis__custom--AmendmentToHorizonCreditAgreementMember__dei--LegalEntityAxis__custom--HorizonTechnologyFinanceCorporationMember_z0bp8AxcWkHd">5
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million in obligations were restructured. As
more fully discussed in Note 11 to these financial statements, in June 2021, the Company entered into a $<span id="xdx_907_eus-gaap--LineOfCreditFacilityMaximumBorrowingCapacity_iI_pn6n6_c20210630__us-gaap--RelatedPartyTransactionsByRelatedPartyAxis__custom--SiliconValleyBankMember__us-gaap--TypeOfArrangementAxis__custom--SVBLoanFacilityMember_zV2Rv9i8JACe">10
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million loan facility with Silicon Valley Bank.
The Company immediately used $<span id="xdx_90D_ecustom--RepaymentOfOutstandingIndebtednessAmount_iI_pn6n6_c20210630__dei--LegalEntityAxis__custom--HorizonTechnologyFinanceCorporationMember__us-gaap--TypeOfArrangementAxis__custom--SVBLoanFacilityMember_zNLFG1E2xTB3">6
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million from this facility to retire all outstanding
indebtedness with Horizon Technology Finance Corporation. The remaining $<span id="xdx_90B_eus-gaap--LineOfCreditFacilityRemainingBorrowingCapacity_iI_pn6n6_c20210630__us-gaap--RelatedPartyTransactionsByRelatedPartyAxis__custom--SiliconValleyBankMember__us-gaap--TypeOfArrangementAxis__custom--SVBLoanFacilityMember_zxSF6sRCR6Dg">4
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million will be available to be drawn down up
to 12 months after closing and will be used for working capital and to fund the advancement of the Company&#8217;s product pipelines.
The funding is in the form of money market secured indebtedness bearing interest at a calculated WSJ Prime-based variable rate (currently
<span id="xdx_907_eus-gaap--DebtInstrumentInterestRateStatedPercentage_iI_pid_dp_uPercentage_c20210630__us-gaap--RelatedPartyTransactionsByRelatedPartyAxis__custom--SiliconValleyBankMember__us-gaap--VariableRateAxis__us-gaap--PrimeRateMember__us-gaap--TypeOfArrangementAxis__custom--SVBLoanFacilityMember_zwZJPMZvFLd4">3.25</span></span><span style="font: 10pt Times New Roman, Times, Serif">%).
<span id="xdx_90C_eus-gaap--DebtInstrumentDescription_c20210101__20210630__us-gaap--TypeOfArrangementAxis__custom--SVBLoanFacilityMember_zf4PMOmqOnt5">Payments
under the loan agreement are interest only for the first 24 months after loan closing, followed by a 24-month amortization period of
principal and interest through the scheduled maturity date.</span></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">As
more fully discussed in Note 12, during 2021 through the date of the filing of this Quarterly Report on Form 10-Q, the Company has raised
approximately $<span id="xdx_901_eus-gaap--ProceedsFromContributedCapital_pn5n6_c20210317__20210319__us-gaap--TypeOfArrangementAxis__custom--CapitalOnDemandTMSalesAgreementMember__dei--LegalEntityAxis__custom--JonesTradingInstitutionalServicesLLCMember_za4ISqmWMfL4">6.9
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million in gross proceeds from the use of its
JonesTrading Capital on Demand<sup>TM</sup> financing facility, $<span id="xdx_903_eus-gaap--DebtInstrumentFaceAmount_iI_pn6n6_c20210131__us-gaap--TypeOfArrangementAxis__custom--CapitalOnDemandTMSalesAgreementMember__dei--LegalEntityAxis__custom--JonesTradingInstitutionalServicesLLCMember_zqPg8iwXU2p2">35
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million from a registered direct financing completed
in January 2021, $<span id="xdx_909_eus-gaap--DebtInstrumentFaceAmount_iI_pn6n6_c20210405__us-gaap--TypeOfArrangementAxis__custom--CapitalOnDemandTMSalesAgreementMember__dei--LegalEntityAxis__custom--JonesTradingInstitutionalServicesLLCMember_zQjCKudCqbe8">15
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million from a registered direct financing completed
on April 5, 2021, and $<span id="xdx_907_eus-gaap--ProceedsFromWarrantExercises_pn5n6_c20210101__20210131__us-gaap--TypeOfArrangementAxis__custom--CapitalOnDemandTMSalesAgreementMember__dei--LegalEntityAxis__custom--JonesTradingInstitutionalServicesLLCMember_zK45SMEHZAQk">1.5
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million from warrant exercises. With $<span id="xdx_906_ecustom--CashAndCashEquivalentsRestrictedCashShorttermInvestmentsAndReceivableOnSaleOfNetOperatingLosses_iI_pn5n6_c20210630__dei--LegalEntityAxis__custom--JonesTradingInstitutionalServicesLLCMember__us-gaap--TypeOfArrangementAxis__custom--CapitalOnDemandTMSalesAgreementMember_zAvkbZ7Ym9Yl">64.5
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million in cash and cash equivalents, restricted
cash, short-term investments and interest receivable, the Company believes it has sufficient capital resources to fund
its operations through the end of 2024.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">The
Company has based its estimates on assumptions that may prove to be wrong. The Company may need to obtain additional funds sooner or
in greater amounts than it currently anticipates. Potential sources of financing include strategic relationships, public or private sales
of the Company&#8217;s shares or debt, the sale of the Company&#8217;s State of New Jersey net operating losses and other sources. If
the Company raises funds by selling additional shares of common stock or other securities convertible into common stock, the ownership
interest of existing stockholders may be diluted.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<span></span>
</td>
</tr>
</table>
<div style="display: none;">
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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The entire disclosure when substantial doubt is raised about the ability to continue as a going concern. Includes, but is not limited to, principal conditions or events that raised substantial doubt about the ability to continue as a going concern, management's evaluation of the significance of those conditions or events in relation to the ability to meet its obligations, and management's plans that alleviated or are intended to mitigate the conditions or events that raise substantial doubt about the ability to continue as a going concern.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 205<br> -SubTopic 40<br> -URI http://asc.fasb.org/subtopic&amp;trid=51888271<br></p></div>
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<span style="display: none;">v3.21.2</span><table class="report" border="0" cellspacing="2" id="idm140561281337512">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>New Accounting Pronouncements<br></strong></div></th>
<th class="th" colspan="1">6 Months Ended</th>
</tr>
<tr><th class="th"><div>Jun. 30, 2021</div></th></tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AccountingChangesAndErrorCorrectionsAbstract', window );"><strong>Accounting Changes and Error Corrections [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_NewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock', window );">New Accounting Pronouncements</a></td>
<td class="text"><p id="xdx_801_eus-gaap--NewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock_z9QsB29XOOTj" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><b>Note
4. <span id="xdx_82F_z5vVHZtyOqXc">New Accounting Pronouncements</span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">From
time to time, new accounting pronouncements are issued by the Financial Accounting Standards Board (FASB) and are adopted by us as of
the specified effective date. Unless otherwise discussed, we believe that the impact of recently issued accounting pronouncements will
not have a material impact on the Company&#8217;s condensed consolidated financial position, results of operations, and cash flows, or
do not apply to our operations.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">In
June 2016, the FASB issued ASU No. 2016-13, &#8220;Financial Instruments &#8211; Credit Losses (Topic 326): Measurement of Credit Losses
on Financial Instruments&#8221;, which modifies the measurement of expected credit losses on certain financial instruments. The Company
adopted ASU 2016-13 in the first quarter of 2021 utilizing the modified retrospective transition method. Based on the composition of
the Company&#8217;s investment portfolio and current market conditions, the adoption of ASU 2016-13 did not have a material impact on
its consolidated financial statements.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">In
December 2019, the FASB issued ASU No. 2019-12, Income Taxes (Topic 740). The standard simplifies the accounting for incomes taxes by
removing certain exceptions to the general principles in Topic 740 related to the approach for intra-period tax allocation and the recognition
of deferred tax liabilities for outside basis differences. The standard also clarifies the accounting for transactions that result in
a step-up in the tax basis of goodwill. The standard also improves consistent application of and simplifies GAAP for other areas of Topic
740 by clarifying and amending existing guidance. The amendment is effective for fiscal years, and interim periods within those fiscal
years, beginning after December 15, 2020. The Company adopted this standard during the first quarter of 2021. The adoption of ASU 2019-12
did not have a material impact on its consolidated financial statements.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">In
connection with the upcoming elimination of the London Inter-bank Offered Rate, (&#8220;LIBOR&#8221;) and other reference interest rates,
the FASB issued ASU 2020-04, Reference Rate Reform (Topic 848) Facilitation of the Effects of Reference Reform on Financial Reporting.
ASU 2020-04, which is available for contract modifications and hedging relationship modifications entered into or evaluated before December
31, 2022, provides certain practical expedients related to simplifying the accounting for contract modifications resulting from the change
in terms from LIBOR to a new required interest rate benchmark. The Company is currently evaluating the effects of adopting this accounting
standards update.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<span></span>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The entire disclosure for change in accounting principle. Includes, but is not limited to, nature, reason, and method of adopting amendment to accounting standards or other change in accounting principle.</p></div>
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<span style="display: none;">v3.21.2</span><table class="report" border="0" cellspacing="2" id="idm140561282740856">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Restricted Cash<br></strong></div></th>
<th class="th" colspan="1">6 Months Ended</th>
</tr>
<tr><th class="th"><div>Jun. 30, 2021</div></th></tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ReceivablesAbstract', window );"><strong>Receivables [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_RestrictedAssetsDisclosureTextBlock', window );">Restricted Cash</a></td>
<td class="text"><p id="xdx_80F_eus-gaap--RestrictedAssetsDisclosureTextBlock_zSgNtnKozLjb" style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif"><b>Note
5. <span id="xdx_82D_z5d9qsvgwDE2">Restricted Cash</span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif"><b>&#160;</b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">As
a condition of the $<span id="xdx_901_eus-gaap--LineOfCreditFacilityMaximumBorrowingCapacity_iI_pn6n6_c20210618__us-gaap--RelatedPartyTransactionsByRelatedPartyAxis__custom--SiliconValleyBankMember__us-gaap--TypeOfArrangementAxis__custom--SVBLoanFacilityMember_zI0eQmDX1ONi">10
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million loan facility with Silicon Valley Bank
(&#8220;SVB&#8221;) entered into on June 18, 2021 as further discussed in Note 11, <span id="xdx_900_eus-gaap--LineOfCreditFacilityDescription_c20210601__20210618__us-gaap--TypeOfArrangementAxis__custom--SVBLoanFacilityMember_zVcmOyGoWY94">the
Company is required at all times to maintain on deposit with SVB as cash collateral in a segregated money market bank account
in the name of the Company, unrestricted and unencumbered cash in an amount of at least 100% of the aggregate outstanding amount of the
SVB loan facility. SVB may restrict withdrawals or transfers by or on behalf of the Company that would violate this requirement.
</span></span><span style="font: 10pt Times New Roman, Times, Serif">The required reserve totaled $<span id="xdx_90A_eus-gaap--RestrictedInvestments_iI_pn5n6_c20210630__us-gaap--RelatedPartyTransactionsByRelatedPartyAxis__custom--SiliconValleyBankMember__us-gaap--TypeOfArrangementAxis__custom--SVBLoanFacilityMember_ziQKADbcEov2">6.0
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million as of June 30, 2021. This amount is presented
in part as restricted cash in other non-current assets on the accompanying condensed consolidated balance sheets.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>




<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p id="xdx_898_eus-gaap--ScheduleOfRestrictedCashAndCashEquivalentsTextBlock_z8WfHHRzm9Ci" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">The
following table reconciles cash and cash equivalents and restricted cash per the balance sheet to the condensed statement of cash flows:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; display: none; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;<span id="xdx_8B9_zu6BBBVVxRYh">Schedule
of Cash and Cash Equivalents and Restricted Cash</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="vertical-align: bottom">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" id="xdx_499_20210630_zGNQaOpaYT13" style="font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">June
    30,</span></td><td style="font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" id="xdx_493_20200630_zxHHC3hlb117" style="font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">June
    30,</span></td><td style="font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">2021</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">2020</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_405_eus-gaap--CashAndCashEquivalentsAtCarryingValue_iI_pp0p0_maCCERCz29N_ztdehdP1Lfm9" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="width: 60%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">Cash and cash equivalents</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td style="width: 16%; text-align: right"><span style="font-family: Times New Roman, Times, Serif">26,437,424</span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td style="width: 16%; text-align: right"><span style="font-family: Times New Roman, Times, Serif">22,653,760</span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_403_eus-gaap--RestrictedInvestments_iI_pp0p0_maCCERCz29N_zVPUqCGAxf5c" style="vertical-align: bottom; background-color: White">
    <td style="text-align: left; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">Money market investments,
    restricted</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif">6,000,000</span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0773">&#160;</span></span></td><td style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif">-</span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_404_eus-gaap--CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_iTI_pp0p0_mtCCERCz29N_zHaEkfeLA1P2" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="padding-left: 10pt; padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">Total</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td style="border-bottom: Black 2.5pt double; text-align: right"><span style="font-family: Times New Roman, Times, Serif">32,437,424</span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td style="border-bottom: Black 2.5pt double; text-align: right"><span style="font-family: Times New Roman, Times, Serif">22,653,760</span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  </table>

<p id="xdx_8AA_zpb3DK2tazK9" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<span></span>
</td>
</tr>
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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ReceivablesAbstract</td>
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<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The entire disclosure for assets that are restricted in their use, generally by contractual agreements or regulatory requirements. This would include, but not limited to, a description of the restricted assets and the terms of the restriction.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
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<span style="display: none;">v3.21.2</span><table class="report" border="0" cellspacing="2" id="idm140561281476696">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Net Loss per Common Share<br></strong></div></th>
<th class="th" colspan="1">6 Months Ended</th>
</tr>
<tr><th class="th"><div>Jun. 30, 2021</div></th></tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_EarningsPerShareAbstract', window );"><strong>Earnings Per Share [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_EarningsPerShareTextBlock', window );">Net Loss per Common Share</a></td>
<td class="text"><p id="xdx_80A_eus-gaap--EarningsPerShareTextBlock_zwTEQ6ataZc8" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><b>Note
6. <span id="xdx_822_za03PqMUoPEf">Net Loss per Common Share</span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Basic
loss per share is calculated based upon the net loss available to common shareholders divided by the weighted average number of common
shares outstanding during the period. Diluted loss per share is calculated after adjusting the denominator of the basic earnings per
share computation for the effects of all dilutive potential common shares outstanding during the period. The dilutive effects of preferred
stock, options and warrants and their equivalents are computed using the treasury stock method.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">The
total number of shares of common stock issuable upon exercise of warrants, stock option grants and equity awards were <span id="xdx_907_ecustom--NumberOfSharesOfCommonStockIssuableUponExerciseOfWarrantsAndEquityAwards_pid_c20210101__20210630_zmsnKy2rNZg4">9,325,228
</span></span><span style="font: 10pt Times New Roman, Times, Serif">and <span id="xdx_901_ecustom--NumberOfSharesOfCommonStockIssuableUponExerciseOfWarrantsAndEquityAwards_pid_c20200101__20200630_z48gjb7JWcOk">8,560,124
</span></span><span style="font: 10pt Times New Roman, Times, Serif">shares for the three and six-month periods ended
June 30, 2021 and 2020, respectively. Warrants with an exercise price of $<span id="xdx_907_eus-gaap--ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_c20210630_pdd">0.01
</span></span><span style="font: 10pt Times New Roman, Times, Serif">exercisable for <span id="xdx_90F_ecustom--NumberOfSharesOfCommonStockIssuedInCalculationBasicLossPerShare_pid_c20200101__20200630_za86XsP5oyP7">200,000
</span></span><span style="font: 10pt Times New Roman, Times, Serif">shares of common stock were considered issued
in calculating basic loss per share during the first six-months of 2020. These warrants were exercised in October 2020. For the three
and six-month periods ended June 30, 2021 and 2020, diluted loss per common share was the same as basic loss per common share as the
other warrants and equity awards that were convertible into shares of the Company&#8217;s common stock were excluded from the calculation
of diluted loss per common share as their effect would have been anti-dilutive. The Company did not pay any dividends during the first
six months of 2021 or 2020.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<span></span>
</td>
</tr>
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<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_EarningsPerShareAbstract">
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<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_EarningsPerShareAbstract</td>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The entire disclosure for earnings per share.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 260<br> -SubTopic 10<br> -Section 50<br> -Paragraph 3<br> -URI http://asc.fasb.org/extlink&amp;oid=109243012&amp;loc=SL65017193-207537<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 260<br> -SubTopic 10<br> -Section 50<br> -Paragraph 1<br> -Subparagraph (c)<br> -URI http://asc.fasb.org/extlink&amp;oid=124432515&amp;loc=d3e3550-109257<br><br>Reference 3: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 260<br> -URI http://asc.fasb.org/topic&amp;trid=2144383<br><br>Reference 4: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 260<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -URI http://asc.fasb.org/extlink&amp;oid=124432515&amp;loc=d3e3630-109257<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
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<span style="display: none;">v3.21.2</span><table class="report" border="0" cellspacing="2" id="idm140561283328776">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Investment in Debt Securities Available for Sale<br></strong></div></th>
<th class="th" colspan="1">6 Months Ended</th>
</tr>
<tr><th class="th"><div>Jun. 30, 2021</div></th></tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract', window );"><strong>Investments, Debt and Equity Securities [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_InvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureTextBlock', window );">Investment in Debt Securities Available for Sale</a></td>
<td class="text"><p id="xdx_80A_eus-gaap--InvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureTextBlock_zlpYMOEScUfh" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><b>Note
7. <span id="xdx_828_zpgEeELWxkTd">Investment in Debt Securities Available for Sale</span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Investments
in debt securities available for sale with a fair value of $<span id="xdx_901_eus-gaap--AvailableForSaleSecuritiesDebtSecuritiesCurrent_c20210630_pp0p0">31,923,285
</span></span><span style="font: 10pt Times New Roman, Times, Serif">as of June 30, 2021, consisted of government
backed debt securities and commercial paper. These investments are valued at estimated fair value, with unrealized gains and losses reported
as a separate component of stockholders&#8217; equity in accumulated other comprehensive loss. The Company only had investments in cash
and cash equivalents on December 31, 2020.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Investments
in debt securities available for sale are evaluated periodically to determine whether a decline in their value is other than temporary.
The term &#8220;other than temporary&#8221; is not intended to indicate a permanent decline in value. Rather, it means that the prospects
for near term recovery of value are not necessarily favorable, or that there is a lack of evidence to support fair values equal to, or
greater than, the carrying value of the security. Management reviews criteria such as the magnitude and duration of the decline, as well
as the reasons for the decline, to predict whether the loss in value is other than temporary. Once a decline in value is determined to
be other than temporary, the value of the security is reduced and a corresponding charge to earnings is recognized.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p id="xdx_89A_eus-gaap--AvailableForSaleSecuritiesTextBlock_zRaide2ifxYk" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">A
summary of the cost, fair value and maturities of the Company&#8217;s short-term investments is as follows:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; display: none; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif">&#160;<span id="xdx_8BC_z87fG4UsVTe9">Schedule
of Cost, Fair Value and Maturities of Short Term Investments</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="vertical-align: bottom">
    <td style="font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="6" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">June
    30, 2021</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="6" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">December
    31, 2020</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom">
    <td style="font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">Cost</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">Fair
    Value</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">Cost</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">Fair
    Value</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">Short-term investments</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td style="width: 40%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">Commercial paper</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_98A_eus-gaap--ShortTermInvestments_c20210630__us-gaap--FinancialInstrumentAxis__us-gaap--CommercialPaperMember_pp0p0" style="width: 11%; text-align: right" title="Short-term investments - Cost"><span style="font-family: Times New Roman, Times, Serif">7,795,035</span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_98E_eus-gaap--AvailableForSaleSecuritiesDebtSecuritiesCurrent_c20210630__us-gaap--FinancialInstrumentAxis__us-gaap--CommercialPaperMember_pp0p0" style="width: 11%; text-align: right" title="Short-term investments - Fair Value"><span style="font-family: Times New Roman, Times, Serif">7,792,785</span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_980_eus-gaap--ShortTermInvestments_c20201231__us-gaap--FinancialInstrumentAxis__us-gaap--CommercialPaperMember_pp0p0" style="width: 11%; text-align: right" title="Short-term investments - Cost"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0793">-</span></span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_98D_eus-gaap--AvailableForSaleSecuritiesDebtSecuritiesCurrent_c20201231__us-gaap--FinancialInstrumentAxis__us-gaap--CommercialPaperMember_pp0p0" style="width: 11%; text-align: right" title="Short-term investments - Fair Value"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0795">-</span></span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">Government backed debt
    securities</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_985_eus-gaap--ShortTermInvestments_c20210630__us-gaap--FinancialInstrumentAxis__custom--GovernmentBackedDebtSecuritiesMember_pp0p0" style="border-bottom: Black 1.5pt solid; text-align: right" title="Short-term investments - Cost"><span style="font-family: Times New Roman, Times, Serif">24,132,020</span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_98A_eus-gaap--AvailableForSaleSecuritiesDebtSecuritiesCurrent_c20210630__us-gaap--FinancialInstrumentAxis__custom--GovernmentBackedDebtSecuritiesMember_pp0p0" style="border-bottom: Black 1.5pt solid; text-align: right" title="Short-term investments - Fair Value"><span style="font-family: Times New Roman, Times, Serif">24,130,500</span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span>-</td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 1.5pt solid; text-align: right">-</td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td style="font-weight: bold; padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">Total</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_986_eus-gaap--ShortTermInvestments_c20210630_pp0p0" style="border-bottom: Black 2.5pt double; text-align: right" title="Short-term investments - Cost"><span style="font-family: Times New Roman, Times, Serif">31,927,055</span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_989_eus-gaap--AvailableForSaleSecuritiesDebtSecuritiesCurrent_c20210630_pp0p0" style="border-bottom: Black 2.5pt double; text-align: right" title="Short-term investments - Fair Value"><span style="font-family: Times New Roman, Times, Serif">31,923,285</span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_981_eus-gaap--ShortTermInvestments_c20201231_pp0p0" style="border-bottom: Black 2.5pt double; text-align: right" title="Short-term investments - Cost"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0805">-</span></span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_98C_eus-gaap--AvailableForSaleSecuritiesDebtSecuritiesCurrent_c20201231_pp0p0" style="border-bottom: Black 2.5pt double; text-align: right" title="Short-term investments - Fair Value"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0807">-</span></span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  </table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="vertical-align: bottom">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="6" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">June
    30, 2021</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="6" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">December
    31, 2020</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom">
    <td style="font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">Cost</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">Fair
    Value</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">Cost</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">Fair
    Value</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">Short-term investment maturities</span></td><td style="font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td style="width: 40%"><span style="font-family: Times New Roman, Times, Serif">Within 3 months</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_985_ecustom--DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingWithinThreeMonthsAmortizedCost_c20210630_pp0p0" style="width: 11%; text-align: right" title="Short-term investment maturities - Within 3 months, cost"><span style="font-family: Times New Roman, Times, Serif">2,999,420</span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_989_ecustom--DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingWithinThreeMonthsFairValue_c20210630_pp0p0" style="width: 11%; text-align: right" title="Short-term investment maturities - Within 3 months, fair value"><span style="font-family: Times New Roman, Times, Serif">7,792,785</span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_986_ecustom--DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingWithinThreeMonthsAmortizedCost_c20201231_pp0p0" style="width: 11%; text-align: right" title="Short-term investment maturities - Within 3 months, cost"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0813">-</span></span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_984_ecustom--DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingWithinThreeMonthsFairValue_c20201231_pp0p0" style="width: 11%; text-align: right" title="Short-term investment maturities - Within 3 months, fair value"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0815">-</span></span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">Between 3-12 months</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_981_ecustom--DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingBetweenThreeAndTwelveMonthsAmortizedCost_c20210630_pp0p0" style="border-bottom: Black 1.5pt solid; text-align: right" title="Short-term investment maturities - Between 3-12 months, cost"><span style="font-family: Times New Roman, Times, Serif">28,927,635</span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_98E_ecustom--DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingBetweenThreeAndTwelveMonthsFairValue_c20210630_pp0p0" style="border-bottom: Black 1.5pt solid; text-align: right" title="Short-term investment maturities - Between 3-12 months, fair value"><span style="font-family: Times New Roman, Times, Serif">24,130,500</span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_984_ecustom--DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingBetweenThreeAndTwelveMonthsAmortizedCost_c20201231_pp0p0" style="border-bottom: Black 1.5pt solid; text-align: right" title="Short-term investment maturities - Between 3-12 months, cost"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0821">-</span></span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_98D_ecustom--DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingBetweenThreeAndTwelveMonthsFairValue_c20201231_pp0p0" style="border-bottom: Black 1.5pt solid; text-align: right" title="Short-term investment maturities - Between 3-12 months, fair value"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0823">-</span></span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td style="font-weight: bold; padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">Total</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_98B_ecustom--AvailableForSaleDebtSecuritiesAmortizedCostBasisCurrent_c20210630_pp0p0" style="border-bottom: Black 2.5pt double; text-align: right" title="Total, cost"><span style="font-family: Times New Roman, Times, Serif">31,927,055</span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_983_eus-gaap--AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate_c20210630_pp0p0" style="border-bottom: Black 2.5pt double; text-align: right" title="Total, fair value"><span style="font-family: Times New Roman, Times, Serif">31,923,285</span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_988_ecustom--AvailableForSaleDebtSecuritiesAmortizedCostBasisCurrent_c20201231_pp0p0" style="border-bottom: Black 2.5pt double; text-align: right" title="Total, cost"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0829">-</span></span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_980_eus-gaap--AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate_c20201231_pp0p0" style="border-bottom: Black 2.5pt double; text-align: right" title="Total, fair value"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0831">-</span></span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  </table>

<p id="xdx_8AE_zM8e9HIJINVg" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>




<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p id="xdx_899_eus-gaap--ScheduleOfUnrealizedLossOnInvestmentsTableTextBlock_zoRkyQc8eJSh" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">The
following table shows the Company&#8217;s investment in debt securities available for sale gross unrealized gains (losses) and fair value
by investment category and length of time that individual securities have been in a continuous unrealized loss position at June 30, 2021
and December 31, 2020. The Company has reviewed individual securities to determine whether a decline in fair value below the amortizable
cost basis is other than temporary.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; display: none; margin: 0; text-align: justify"><span id="xdx_8BD_zpnMxAxahwPg" style="font: 10pt Times New Roman, Times, Serif">Summary
of Investment Securities Gross Unrealized Gains (Losses)</span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="vertical-align: bottom">
    <td style="font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="6" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">June
    30, 2021</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="6" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">December
    31, 2020</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom">
    <td style="border-bottom: Black 1.5pt solid; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">Available
    for sale securities (all unrealized holding gains and losses are less than 12 months at date of measurement)</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">Fair
    Value</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>Unrealized
                                            Holding</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>Gains
                                            (Losses)</b></span></p></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">Fair
    Value</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>Unrealized
                                            Holding</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>Gains
                                            (Losses)</b></span></p></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="width: 44%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">Investments with unrealized gains</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_987_ecustom--AvailableForSaleSecuritiesUnrealizedGainsFairValue_iI_c20210630_z3kP7aYVfYY7" style="width: 11%; text-align: right" title="Investments with unrealized gains, Fair Value"><span style="font-family: Times New Roman, Times, Serif">5,998,980</span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_989_ecustom--AvailableForSaleSecuritiesUnrealizedHoldingGainsLessThanTwelveMonths_iI_c20210630_z73yY5dYjkJj" style="width: 11%; text-align: right" title="Investments with unrealized gains, Unrealized Holding Gains (Losses)"><span style="font-family: Times New Roman, Times, Serif">1,073</span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_98E_ecustom--AvailableForSaleSecuritiesUnrealizedGainsFairValue_iI_c20201231_zEUHF5fxggM9" style="width: 9%; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0838">-</span></span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_98D_ecustom--AvailableForSaleSecuritiesUnrealizedHoldingGainsLessThanTwelveMonths_iI_c20201231_zJALWk90Uhec" style="width: 9%; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0839">-</span></span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td style="text-align: left; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">Investments with unrealized
    losses</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_98C_ecustom--AvailableForSaleSecuritiesUnrealizedLossFairValue_iI_c20210630_z9UDyW8OCJEh" style="border-bottom: Black 1.5pt solid; text-align: right" title="Investments with unrealized losses, Fair Value"><span style="font-family: Times New Roman, Times, Serif">25,924,305</span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_989_ecustom--AvailableForSaleSecuritiesUnrealizedHoldingLossesLessThanTwelveMonths_iI_c20210630_zlbRJMBli5Vc" style="border-bottom: Black 1.5pt solid; text-align: right" title="Investments with unrealized Losses, Unrealized Holding Gains (Losses)"><span style="font-family: Times New Roman, Times, Serif">(4,843</span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">)</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_980_ecustom--AvailableForSaleSecuritiesUnrealizedLossFairValue_iI_c20201231_zEaBVYTqEBR" style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0844">-</span></span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_98B_ecustom--AvailableForSaleSecuritiesUnrealizedHoldingLossesLessThanTwelveMonths_iI_c20201231_zC9q5gqMTzC2" style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0845">-</span></span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="padding-left: 10pt; font-weight: bold; padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">Total</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_989_eus-gaap--AvailableForSaleSecuritiesDebtSecuritiesCurrent_iI_c20210630_zd1pGBsy9UX3" style="border-bottom: Black 2.5pt double; text-align: right" title="Investment securities, available for sale"><span style="font-family: Times New Roman, Times, Serif">31,923,285</span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_988_ecustom--AvailableForSaleSecuritiesUnrealizedHoldingGainsLossesLessThanTwelveMonths_iI_c20210630_zklx76pw00Xl" style="border-bottom: Black 2.5pt double; text-align: right" title="Investments with unrealized Gains (Losses), Unrealized Holding Gains (Losses)"><span style="font-family: Times New Roman, Times, Serif">(3,770</span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">)</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_98E_eus-gaap--AvailableForSaleSecuritiesDebtSecuritiesCurrent_iI_pp0p0_c20201231_zitrNAaI3459" style="border-bottom: Black 2.5pt double; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0850">-</span></span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_98A_ecustom--AvailableForSaleSecuritiesUnrealizedHoldingGainsLossesLessThanTwelveMonths_iI_c20201231_zMBfZ8IjgWek" style="border-bottom: Black 2.5pt double; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0851">-</span></span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  </table>

<p id="xdx_8A4_zQnLlUZMRva7" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p id="xdx_89F_eus-gaap--InvestmentIncomeTextBlock_zFQTOKwfKVCf" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Investment
(loss) income, which includes net realized losses on sales of available for sale securities and investment income interest and
dividends, is summarized as follows:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; display: none; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif">&#160;<span id="xdx_8B2_zeRwJVgb5CRk">Summary
of Net Realized Losses on Sales of Available for Sale Securities and Investment Income Interest and Dividends</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="display: none; vertical-align: bottom">
    <td style="text-align: center"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" id="xdx_494_20210401__20210630_zSHyDhyzLjZ6" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">2021</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" id="xdx_493_20200401__20200630_zgTSeZK7Cr9e" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">2020</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
<tr style="vertical-align: bottom">
    <td style="text-align: center"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="6" style="border-bottom: Black 1.5pt solid; text-align: center"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>Three
                                            Months Ended</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>June
                                            30,</b></span></p></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom">
    <td style="text-align: center"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">2021</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">2020</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_403_eus-gaap--InvestmentIncomeInterestAndDividend_maIINzj8E_zfdE28HysZqg" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="width: 60%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">Interest and dividends accrued
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    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td style="width: 16%; text-align: right"><span style="font-family: Times New Roman, Times, Serif">1,436</span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td style="width: 16%; text-align: right"><span style="font-family: Times New Roman, Times, Serif">18,095</span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_409_eus-gaap--AvailableForSaleSecuritiesGrossRealizedGainLossNet_maIINzj8E_zSqSuTUlXRhc" style="vertical-align: bottom; background-color: White">
    <td style="text-align: left; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">Realized (losses) gains</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif">(1,785</span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">)</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif">2,865</span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_403_ecustom--InvestmentIncomeLossNonoperating_iT_pp0p0_mtIINzj8E_zhAI9SQfD4u6" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left; padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">Investment (loss) income,
    net</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td style="border-bottom: Black 2.5pt double; text-align: right"><span style="font-family: Times New Roman, Times, Serif">(349</span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">)</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td style="border-bottom: Black 2.5pt double; text-align: right"><span style="font-family: Times New Roman, Times, Serif">20,960</span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="display: none; vertical-align: bottom">
    <td style="text-align: center"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" id="xdx_495_20210101__20210630_zueeupzM32bg" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">2021</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" id="xdx_494_20200101__20200630_zlvHlUejVj51" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">2020</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
<tr style="vertical-align: bottom">
    <td style="text-align: center"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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                                            Months Ended</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>June
                                            30,</b></span></p></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
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    <td style="text-align: center"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">2021</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">2020</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
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    <td style="width: 60%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">Interest and dividends accrued
    and paid</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td style="width: 16%; text-align: right"><span style="font-family: Times New Roman, Times, Serif">3,847</span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td style="width: 16%; text-align: right"><span style="font-family: Times New Roman, Times, Serif">63,172</span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
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    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif">(1,785</span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">)</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif">46,097</span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
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    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td style="border-bottom: Black 2.5pt double; text-align: right"><span style="font-family: Times New Roman, Times, Serif">2,062</span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td style="border-bottom: Black 2.5pt double; text-align: right"><span style="font-family: Times New Roman, Times, Serif">109,269</span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_40F_ecustom--InvestmentIncomeLossNonoperating_iT_mtIINz3xg_zEY8MspCTele" style="display: none; vertical-align: bottom; background-color: White">
    <td style="text-align: left; padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">Investment (loss) income,
    net</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 2.5pt double; text-align: right"><span style="font-family: Times New Roman, Times, Serif">2,062</span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 942<br> -SubTopic 320<br> -URI http://asc.fasb.org/subtopic&amp;trid=2209399<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 946<br> -SubTopic 320<br> -URI http://asc.fasb.org/subtopic&amp;trid=2324412<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 320<br> -URI http://asc.fasb.org/topic&amp;trid=2196928<br><br>Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 940<br> -SubTopic 320<br> -URI http://asc.fasb.org/subtopic&amp;trid=2176304<br><br>Reference 5: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher SEC<br> -Name Regulation S-K (SK)<br> -Number 229<br> -Section 1403<br> -Paragraph (b)<br></p></div>
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<span style="display: none;">v3.21.2</span><table class="report" border="0" cellspacing="2" id="idm140561281163128">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Fair Value Measurements<br></strong></div></th>
<th class="th" colspan="1">6 Months Ended</th>
</tr>
<tr><th class="th"><div>Jun. 30, 2021</div></th></tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_DisclosureFairValueMeasurementsAbstract', window );"><strong>Fair Value Measurements</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_DerivativesAndFairValueTextBlock', window );">Fair Value Measurements</a></td>
<td class="text"><p id="xdx_804_eus-gaap--DerivativesAndFairValueTextBlock_zZIO6JLbLlU" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><b>Note
8. <span id="xdx_824_zNUNouQNdgKg">Fair Value Measurements</span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">FASB
ASC Section 820, <i>Fair Value Measurements and Disclosures</i> establishes a three-level hierarchy for fair value measurements which
requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. The
three levels of inputs that may be used to measure fair value are as follows:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 0.5in; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Level
1: Quoted prices (unadjusted) or identical assets or liabilities in active markets that the entity has the ability to access as of the
measurement date;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 0.5in; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 0.5in; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Level
2: Significant other observable inputs other than Level 1 prices such as quoted prices for similar assets or liabilities; quoted prices
in markets that are not active; or other inputs that are observable or can be corroborated by observable market data; and</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 0.5in; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 0.5in; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Level
3: Significant unobservable inputs that reflect a reporting entity&#8217;s own assumptions that market participants would use in pricing
an asset or liability.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Cash
and cash equivalents, other current assets, accounts payable and other accrued liabilities are reflected in the condensed consolidated
balance sheet at their approximate estimated fair values primarily due to their short-term nature. The fair values of securities available
for sale is determined by relying on the securities&#8217; relationship to other benchmark quoted securities and classified its investments
as Level 2 items in both 2021 and 2020. There were no transfers of assets or liabilities between Level 1 and Level 2 and no transfers
in or out of Level 3 during the six-months ended June 30, 2021 or during the year ended December 31, 2020. The changes
in Level 3 liabilities were the result of changes in the fair value of the earn-out milestone liability included in earnings and in-process
R&amp;D. The earnout milestone liability is valued using a risk-adjusted assessment of the probability of payment of each milestone,
discounted to present value using an estimated time to achieve the milestone (see Note 14).</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>




<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p id="xdx_89D_eus-gaap--ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock_z4POuAb1LhXf" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Assets
and liabilities measured at fair value are summarized below:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;<span id="xdx_8B9_zn5uah0SSVHd" style="display: none">Schedule
of Fair Value, Assets and Liabilities Measured on Recurring Basis</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
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    <td style="text-align: center"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">Total
    Fair Value</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">Quoted
    Prices in Active Markets for Identical Assets/Liabilities (Level 1)</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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                                            Other Observable Inputs</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>(Level
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    <td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>Significant
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  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td><span style="font-family: Times New Roman, Times, Serif">Assets:</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td><span style="font-family: Times New Roman, Times, Serif">Recurring items as of June 30, 2021</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td style="padding-left: 10pt; width: 40%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">Investment
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    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_98D_eus-gaap--AvailableForSaleSecuritiesDebtSecuritiesCurrent_c20210630__us-gaap--FairValueByMeasurementFrequencyAxis__us-gaap--FairValueMeasurementsRecurringMember__us-gaap--FinancialInstrumentAxis__us-gaap--CorporateDebtSecuritiesMember_pp0p0" style="width: 11%; text-align: right" title="Investment securities, available for sale"><span style="font-family: Times New Roman, Times, Serif">31,923,285</span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_983_eus-gaap--AvailableForSaleSecuritiesDebtSecuritiesCurrent_c20210630__us-gaap--FairValueByMeasurementFrequencyAxis__us-gaap--FairValueMeasurementsRecurringMember__us-gaap--FairValueByFairValueHierarchyLevelAxis__us-gaap--FairValueInputsLevel1Member__us-gaap--FinancialInstrumentAxis__us-gaap--CorporateDebtSecuritiesMember_pp0p0" style="width: 11%; text-align: right" title="Investment securities, available for sale"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0882">&#8211;</span></span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_980_eus-gaap--AvailableForSaleSecuritiesDebtSecuritiesCurrent_c20210630__us-gaap--FairValueByMeasurementFrequencyAxis__us-gaap--FairValueMeasurementsRecurringMember__us-gaap--FairValueByFairValueHierarchyLevelAxis__us-gaap--FairValueInputsLevel2Member__us-gaap--FinancialInstrumentAxis__us-gaap--CorporateDebtSecuritiesMember_pp0p0" style="width: 11%; text-align: right" title="Investment securities, available for sale"><span style="font-family: Times New Roman, Times, Serif">31,923,285</span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_981_eus-gaap--AvailableForSaleSecuritiesDebtSecuritiesCurrent_c20210630__us-gaap--FairValueByMeasurementFrequencyAxis__us-gaap--FairValueMeasurementsRecurringMember__us-gaap--FairValueByFairValueHierarchyLevelAxis__us-gaap--FairValueInputsLevel3Member__us-gaap--FinancialInstrumentAxis__us-gaap--CorporateDebtSecuritiesMember_pp0p0" style="width: 11%; text-align: right" title="Investment securities, available for sale"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0886">&#8211;</span></span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td><span style="font-family: Times New Roman, Times, Serif">Non-recurring items as of June 30, 2021</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="padding-left: 10pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">In-process R&amp;D (Note
    9)</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_989_eus-gaap--AvailableForSaleSecuritiesDebtSecuritiesCurrent_c20210630__us-gaap--FairValueByMeasurementFrequencyAxis__us-gaap--FairValueMeasurementsNonrecurringMember__us-gaap--FinancialInstrumentAxis__custom--InprocessRandDMember_pp0p0" style="text-align: right" title="Investment securities, available for sale"><span style="font-family: Times New Roman, Times, Serif">13,366,234</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_980_eus-gaap--AvailableForSaleSecuritiesDebtSecuritiesCurrent_c20210630__us-gaap--FairValueByMeasurementFrequencyAxis__us-gaap--FairValueMeasurementsNonrecurringMember__us-gaap--FairValueByFairValueHierarchyLevelAxis__us-gaap--FairValueInputsLevel1Member__us-gaap--FinancialInstrumentAxis__custom--InprocessRandDMember_pp0p0" style="text-align: right" title="Investment securities, available for sale"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0890">&#8211;</span></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_981_eus-gaap--AvailableForSaleSecuritiesDebtSecuritiesCurrent_c20210630__us-gaap--FairValueByMeasurementFrequencyAxis__us-gaap--FairValueMeasurementsNonrecurringMember__us-gaap--FairValueByFairValueHierarchyLevelAxis__us-gaap--FairValueInputsLevel2Member__us-gaap--FinancialInstrumentAxis__custom--InprocessRandDMember_pp0p0" style="text-align: right" title="Investment securities, available for sale"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0892">&#8211;</span></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_986_eus-gaap--AvailableForSaleSecuritiesDebtSecuritiesCurrent_c20210630__us-gaap--FairValueByMeasurementFrequencyAxis__us-gaap--FairValueMeasurementsNonrecurringMember__us-gaap--FairValueByFairValueHierarchyLevelAxis__us-gaap--FairValueInputsLevel3Member__us-gaap--FinancialInstrumentAxis__custom--InprocessRandDMember_pp0p0" style="text-align: right" title="Investment securities, available for sale"><span style="font-family: Times New Roman, Times, Serif">13,366,234</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td><span style="font-family: Times New Roman, Times, Serif">Non-recurring items as of December 31, 2020</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td style="padding-left: 10pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">In-process R&amp;D (Note
    9)</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_98C_eus-gaap--AvailableForSaleSecuritiesDebtSecuritiesCurrent_c20201231__us-gaap--FairValueByMeasurementFrequencyAxis__us-gaap--FairValueMeasurementsNonrecurringMember__us-gaap--FinancialInstrumentAxis__custom--InprocessRandDMember_pp0p0" style="text-align: right" title="Investment securities, available for sale"><span style="font-family: Times New Roman, Times, Serif">13,366,234</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_98C_eus-gaap--AvailableForSaleSecuritiesDebtSecuritiesCurrent_c20201231__us-gaap--FairValueByMeasurementFrequencyAxis__us-gaap--FairValueMeasurementsNonrecurringMember__us-gaap--FairValueByFairValueHierarchyLevelAxis__us-gaap--FairValueInputsLevel1Member__us-gaap--FinancialInstrumentAxis__custom--InprocessRandDMember_pp0p0" style="text-align: right" title="Investment securities, available for sale"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0898">&#8211;</span></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_982_eus-gaap--AvailableForSaleSecuritiesDebtSecuritiesCurrent_c20201231__us-gaap--FairValueByMeasurementFrequencyAxis__us-gaap--FairValueMeasurementsNonrecurringMember__us-gaap--FairValueByFairValueHierarchyLevelAxis__us-gaap--FairValueInputsLevel2Member__us-gaap--FinancialInstrumentAxis__custom--InprocessRandDMember_pp0p0" style="text-align: right" title="Investment securities, available for sale"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0900">&#8211;</span></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_983_eus-gaap--AvailableForSaleSecuritiesDebtSecuritiesCurrent_c20201231__us-gaap--FairValueByMeasurementFrequencyAxis__us-gaap--FairValueMeasurementsNonrecurringMember__us-gaap--FairValueByFairValueHierarchyLevelAxis__us-gaap--FairValueInputsLevel3Member__us-gaap--FinancialInstrumentAxis__custom--InprocessRandDMember_pp0p0" style="text-align: right" title="Investment securities, available for sale"><span style="font-family: Times New Roman, Times, Serif">13,366,234</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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  <tr style="vertical-align: bottom; background-color: White">
    <td style="padding-left: 10pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">Earn-out milestone liability
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<p id="xdx_8A1_z2PtZt8SCfn" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The entire disclosure for derivatives and fair value of assets and liabilities.</p></div>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
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<span style="display: none;">v3.21.2</span><table class="report" border="0" cellspacing="2" id="idm140561282698008">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Intangible Assets<br></strong></div></th>
<th class="th" colspan="1">6 Months Ended</th>
</tr>
<tr><th class="th"><div>Jun. 30, 2021</div></th></tr>
<tr class="re">
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<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_IntangibleAssetsDisclosureTextBlock', window );">Intangible Assets</a></td>
<td class="text"><p id="xdx_804_eus-gaap--IntangibleAssetsDisclosureTextBlock_zzoxOLipmjol" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><b>Note
9. <span id="xdx_822_zYNgm3e1UdA8">Intangible Assets</span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">In
June 2014, we completed the acquisition of substantially all of the assets of EGEN, Inc., an Alabama corporation, which has changed its
company name to EGWU, Inc. after the closing of the acquisition (&#8220;EGEN&#8221;). We acquired all of EGEN&#8217;s right, title and
interest in and to substantially all of the assets of EGEN, including cash and cash equivalents, patents, trademarks and other intellectual
property rights, clinical data, certain contracts, licenses and permits, equipment, furniture, office equipment, furnishings, supplies
and other tangible personal property. In addition, CLSN Laboratories assumed certain specified liabilities of EGEN, including the liabilities
arising out of the acquired contracts and other assets relating to periods after the closing date.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><i>Acquired
In-process Research and Development</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Acquired
in-process research and development (IPR&amp;D) consists of EGEN&#8217;s drug technology platforms: TheraPlas and TheraSilence. The fair
value of the IPR&amp;D drug technology platforms was estimated to be $<span id="xdx_909_eus-gaap--IndefinitelivedIntangibleAssetsAcquired_pn5n6_c20210101__20210630__us-gaap--BusinessAcquisitionAxis__custom--EGENIncMember__dei--LegalEntityAxis__custom--IPRAndDDrugTechnologyPlatformsMember_zPvuzEz64MBa">24.2
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million as of the acquisition date. As of the
closing of the acquisition, the IPR&amp;D was considered indefinite lived intangible assets and will not be amortized. IPR&amp;D is reviewed
for impairment at least annually as of our third quarter ended September 30, and whenever events or changes in circumstances indicate
that the carrying value of the assets might not be recoverable. The Company&#8217;s IPR&amp;D consisted of three core elements, its RNA
delivery system, its glioblastoma multiforme cancer (GBM) product candidate and its ovarian cancer indication.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">The
Company&#8217;s ovarian cancer indication, with original value of $<span id="xdx_906_eus-gaap--FinitelivedIntangibleAssetsAcquired1_pn5n6_c20210101__20210630__dei--LegalEntityAxis__custom--IPRAndDDrugTechnologyPlatformsMember__us-gaap--ContingentConsiderationByTypeAxis__custom--OvarianCancerMember_z1ajCb1WHJab">13.3
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million has not been impaired since its acquisition.
At September 30, 2020, the Company evaluated its IPR&amp;D of the ovarian cancer indication and concluded that it is not more likely
than not that the asset is impaired. As no other indicators of impairment existed during the fourth quarter of 2020 or first half of
2021, <span id="xdx_902_eus-gaap--AssetImpairmentCharges_pp0p0_do_c20200101__20200630__dei--LegalEntityAxis__custom--IPRAndDDrugTechnologyPlatformsMember_zJ7zEOjzxcC2">no
</span></span><span style="font: 10pt Times New Roman, Times, Serif">impairment charges were recorded during the three
or six-months ended June 30, 2021 and 2020.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">The
Company&#8217;s GBM candidate, with original value of $<span id="xdx_906_eus-gaap--AssetImpairmentCharges_pn5n6_c20180101__20181231__us-gaap--BusinessAcquisitionAxis__custom--EGENIncMember__us-gaap--ContingentConsiderationByTypeAxis__custom--GlioblastomaMultiformeBrainCancerMember_zaIkrUUgDVj1">9.4
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million had cumulative impairments through 2018
of $<span id="xdx_90C_eus-gaap--AssetImpairmentCharges_pn6n6_c20180101__20181231__us-gaap--BusinessAcquisitionAxis__custom--EGENIncMember_zgFV6MHTYqJ9">7
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million, with remaining carrying value of $<span id="xdx_909_eus-gaap--AssetImpairmentCharges_pn5n6_c20190101__20191231__us-gaap--ContingentConsiderationByTypeAxis__custom--GlioblastomaMultiformeBrainCancerMember_zM9mLehGFYvb">2.4
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million at December 31, 2019. On September 30,
2020, the Company evaluated its IPR&amp;D for the (GBM) product candidate and concluded that it is more likely than not that the asset
is further impaired. After this assessment on September 30, 2020, the Company wrote off the remaining $<span id="xdx_907_eus-gaap--AssetImpairmentCharges_pn5n6_c20200929__20200930__us-gaap--BusinessAcquisitionAxis__custom--EGENIncMember__us-gaap--ContingentConsiderationByTypeAxis__custom--GlioblastomaMultiformeBrainCancerMember_zhIpPkbMlpC8">2.4
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million of this asset, thereby recognizing a
non-cash charge of $<span id="xdx_90F_ecustom--NoncashCharge_pn5n6_c20200701__20200930__us-gaap--BusinessAcquisitionAxis__custom--EGENIncMember__us-gaap--ContingentConsiderationByTypeAxis__custom--GlioblastomaMultiformeBrainCancerMember_zlGEsTTp0Mjh">2.4
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million in the third quarter of 2020.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>




<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif"><i>&#160;</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><i>Covenants
Not to Compete</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Pursuant
to the EGEN Purchase Agreement, EGEN provided certain covenants (&#8220;Covenant Not To Compete&#8221;) to the Company whereby EGEN agreed,
during the period ending on the seventh anniversary of the closing date of the acquisition on June 20, 2014, not to enter into any business,
directly or indirectly, which competes with the business of the Company nor will it contact, solicit or approach any of the employees
of the Company for purposes of offering employment. The Covenant Not to Compete which was valued at approximately $<span id="xdx_90F_eus-gaap--FinitelivedIntangibleAssetsAcquired1_pn5n6_c20210101__20210630__us-gaap--BusinessAcquisitionAxis__custom--EGENIncMember__us-gaap--TypeOfArrangementAxis__custom--PurchaseAgreementMember_zElAFzn39hja">1.6
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million at the date of the EGEN acquisition has
a definitive life and is amortized on a straight-line basis over its life of <span id="xdx_90D_eus-gaap--FiniteLivedIntangibleAssetUsefulLife_dtY_c20210101__20210630__us-gaap--BusinessAcquisitionAxis__custom--EGENIncMember__us-gaap--TypeOfArrangementAxis__custom--PurchaseAgreementMember_zPPMeop8zcDl">7
</span></span><span style="font: 10pt Times New Roman, Times, Serif">years. The Company recognized amortization expense
of $<span id="xdx_90B_eus-gaap--AdjustmentForAmortization_c20200101__20200630__us-gaap--BusinessAcquisitionAxis__custom--EGENIncMember__us-gaap--TypeOfArrangementAxis__custom--PurchaseAgreementMember_zyI2tWwnXl1e">56,830
</span></span><span style="font: 10pt Times New Roman, Times, Serif">in each of the three and six-month periods ended
June 30, 2021 and 2020. The carrying value of the Covenant Not to Compete was fully amortized as of June 30, 2021 and $<span id="xdx_90E_eus-gaap--FiniteLivedIntangibleAssetsNet_c20201231__us-gaap--TypeOfArrangementAxis__custom--AspirePurchaseAgreementsMember_pp0p0">113,660</span></span><span style="font: 10pt Times New Roman, Times, Serif">,
net of $<span id="xdx_90C_eus-gaap--FiniteLivedIntangibleAssetsAccumulatedAmortization_c20201231__us-gaap--TypeOfArrangementAxis__custom--AspirePurchaseAgreementsMember_pp0p0">1,477,554
</span></span><span style="font: 10pt Times New Roman, Times, Serif">accumulated amortization, as of December 31,
2020.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><i>Goodwill</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">The
purchase price exceeded the estimated fair value of the net assets acquired by approximately $<span id="xdx_909_eus-gaap--GoodwillAcquiredDuringPeriod_pn5n6_c20210101__20210630__us-gaap--BusinessAcquisitionAxis__custom--EGENIncMember_z3Tt7kqvnD75">2.0
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million which was recorded as Goodwill. Goodwill
represents the difference between the total purchase price for the net assets purchased from EGEN and the aggregate fair values of tangible
and intangible assets acquired, less liabilities assumed. Goodwill is reviewed for impairment at least annually as of our third quarter
ended September 30 or sooner if we believe indicators of impairment exist. As of June 30, 2021, we concluded that the Company&#8217;s
fair value exceeded its carrying value therefore &#8220;it is not more likely than not&#8221; that the Goodwill was impaired.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p id="xdx_894_eus-gaap--FiniteLivedAndIndefiniteLivedIntangibleAssetsAcquiredAsPartOfBusinessCombinationTableTextBlock_zdYgJeGkoxUh" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Following
is a summary of the net fair value of the assets acquired in the EGEN asset acquisition for the six-month period ended June 30,
2021:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;<span id="xdx_8BB_ztRGk8i77Aa6" style="display: none">Schedule
of Fair Value of Assets Acquired</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="vertical-align: bottom">
    <td style="text-align: center"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"><span style="font-family: Times New Roman, Times, Serif">IPR&amp;D</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"><span style="font-family: Times New Roman, Times, Serif">Goodwill</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"><span style="font-family: Times New Roman, Times, Serif">Covenant
    Not To Compete</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">For the six-months ended June 30,
    2021</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td style="width: 46%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">Balance at January 1, 2021, net</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_986_eus-gaap--FiniteLivedIntangibleAssetsNet_iS_pp0p0_c20210101__20210630__us-gaap--FairValueByAssetClassAxis__custom--IPRAndDMember_zjQ3JIkxxDj7" style="width: 14%; text-align: right" title="Intangible assets, beginning balance"><span style="font-family: Times New Roman, Times, Serif">13,366,234</span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_98E_eus-gaap--FiniteLivedIntangibleAssetsNet_iS_pp0p0_c20210101__20210630__us-gaap--FairValueByAssetClassAxis__us-gaap--GoodwillMember_zNBWiGj7paVi" style="width: 14%; text-align: right" title="Intangible assets, beginning balance"><span style="font-family: Times New Roman, Times, Serif">1,976,101</span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_98E_eus-gaap--FiniteLivedIntangibleAssetsNet_iS_pp0p0_c20210101__20210630__us-gaap--FiniteLivedIntangibleAssetsByMajorClassAxis__us-gaap--NoncompeteAgreementsMember_zdqB8nlRBX59" style="width: 14%; text-align: right" title="Intangible assets, beginning balance"><span style="font-family: Times New Roman, Times, Serif">113,660</span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">Amortization</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_986_eus-gaap--AmortizationOfIntangibleAssets_iN_pp0p0_di_c20210101__20210630__us-gaap--FairValueByAssetClassAxis__custom--IPRAndDMember_z7TzeeSXjI5a" style="border-bottom: Black 1.5pt solid; text-align: right" title="Amortization"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0944">-</span></span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_98D_eus-gaap--AmortizationOfIntangibleAssets_iN_pp0p0_di_c20210101__20210630__us-gaap--FairValueByAssetClassAxis__us-gaap--GoodwillMember_zjtx3T7G2Lgi" style="border-bottom: Black 1.5pt solid; text-align: right" title="Amortization"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0946">-</span></span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_982_eus-gaap--AmortizationOfIntangibleAssets_iN_pp0p0_di_c20210101__20210630__us-gaap--FiniteLivedIntangibleAssetsByMajorClassAxis__us-gaap--NoncompeteAgreementsMember_zNQ4n0vGQP99" style="border-bottom: Black 1.5pt solid; text-align: right" title="Amortization"><span style="font-family: Times New Roman, Times, Serif">(113,660</span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">)</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td style="text-align: left; padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">Balance at June 30,
    2021, net</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_98A_eus-gaap--FiniteLivedIntangibleAssetsNet_iE_pp0p0_c20210101__20210630__us-gaap--FairValueByAssetClassAxis__custom--IPRAndDMember_zZEW29lairU1" style="border-bottom: Black 2.5pt double; text-align: right" title="Intangible assets, ending balance"><span style="font-family: Times New Roman, Times, Serif">13,366,234</span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_983_eus-gaap--FiniteLivedIntangibleAssetsNet_iE_pp0p0_c20210101__20210630__us-gaap--FairValueByAssetClassAxis__us-gaap--GoodwillMember_z0nQAbP1KtYl" style="border-bottom: Black 2.5pt double; text-align: right" title="Intangible assets, ending balance"><span style="font-family: Times New Roman, Times, Serif">1,976,101</span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_98F_eus-gaap--FiniteLivedIntangibleAssetsNet_iE_pp0p0_c20210101__20210630__us-gaap--FiniteLivedIntangibleAssetsByMajorClassAxis__us-gaap--NoncompeteAgreementsMember_zr55ihcRj1a4" style="border-bottom: Black 2.5pt double; text-align: right" title="Intangible assets, ending balance"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0954">-</span></span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  </table>

<p id="xdx_8A4_z0domUgEPXS2" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<span></span>
</td>
</tr>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The entire disclosure for all or part of the information related to intangible assets.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 350<br> -URI http://asc.fasb.org/topic&amp;trid=2144416<br></p></div>
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<span style="display: none;">v3.21.2</span><table class="report" border="0" cellspacing="2" id="idm140561281243288">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Accrued Liabilities<br></strong></div></th>
<th class="th" colspan="1">6 Months Ended</th>
</tr>
<tr><th class="th"><div>Jun. 30, 2021</div></th></tr>
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<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AccountsPayableAndAccruedLiabilitiesDisclosureTextBlock', window );">Accrued Liabilities</a></td>
<td class="text"><p id="xdx_800_eus-gaap--AccountsPayableAndAccruedLiabilitiesDisclosureTextBlock_zhhv59cbBNC1" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><b>Note
10. <span id="xdx_82A_z0L6k1aaQbsc">Accrued Liabilities</span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p id="xdx_89D_eus-gaap--ScheduleOfAccruedLiabilitiesTableTextBlock_zOGA1Tqnz419" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Other
accrued liabilities at June 30, 2021 and December 31, 2020 include the following:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif">&#160;<span id="xdx_8BB_zWfJZ5aHNoz4" style="display: none">Schedule
of Accrued Liabilities</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="vertical-align: bottom">
    <td style="text-align: center"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" id="xdx_497_20210630_z2FDEw1SRoAa" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">June
    30, 2021</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" id="xdx_493_20201231_zBnTiuJAFtpg" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">December
    31, 2020</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom">
    <td style="text-align: center"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="text-align: center"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_401_eus-gaap--ContractualObligation_iI_pp0p0_maALCz6Sz_zfyfKVfsRMK4" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="width: 60%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">Amounts due to contract research
    organizations and other contractual agreements</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td style="width: 16%; text-align: right"><span style="font-family: Times New Roman, Times, Serif">1,189,017</span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td style="width: 16%; text-align: right"><span style="font-family: Times New Roman, Times, Serif">636,000</span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_40B_eus-gaap--EmployeeRelatedLiabilitiesCurrent_iI_pp0p0_maALCz6Sz_zDGQRpcFS3Gf" style="vertical-align: bottom; background-color: White">
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">Accrued payroll and related benefits</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">1,016,610</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">1,736,271</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_40F_eus-gaap--AccruedProfessionalFeesCurrent_iI_pp0p0_maALCz6Sz_zPrELNiZ4yrf" style="vertical-align: bottom; background-color: rgb(204,238,255)">
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    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">80,625</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">66,850</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_40E_eus-gaap--InterestPayableCurrent_iI_pp0p0_maALCz6Sz_z3zsLNxSna9" style="vertical-align: bottom; background-color: White">
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">Accrued interest</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">7,042</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0970">&#160;</span></span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">-</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_40A_eus-gaap--OtherAccruedLiabilitiesCurrent_iI_pp0p0_maALCz6Sz_zpNKibQdMIa3" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">Other</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif">19,411</span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif">19,411</span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_40B_eus-gaap--AccruedLiabilitiesCurrent_iTI_pp0p0_mtALCz6Sz_zGuQO0aCjIf1" style="vertical-align: bottom; background-color: White">
    <td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">Total</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td style="border-bottom: Black 2.5pt double; text-align: right"><span style="font-family: Times New Roman, Times, Serif">2,312,705</span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td style="border-bottom: Black 2.5pt double; text-align: right"><span style="font-family: Times New Roman, Times, Serif">2,458,532</span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
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<p id="xdx_8A7_zIUS3GKp6Zrf" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

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<span style="display: none;">v3.21.2</span><table class="report" border="0" cellspacing="2" id="idm140561281173064">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Notes<br></strong></div></th>
<th class="th" colspan="1">6 Months Ended</th>
</tr>
<tr><th class="th"><div>Jun. 30, 2021</div></th></tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_DebtDisclosureAbstract', window );"><strong>Debt Disclosure [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_DebtDisclosureTextBlock', window );">Notes</a></td>
<td class="text"><p id="xdx_804_eus-gaap--DebtDisclosureTextBlock_zDBsHBsTvYFi" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><b>Note
11. <span id="xdx_82D_ztfCNB3BF8f6">Notes</span></b></span><b> <span style="font: 10pt Times New Roman, Times, Serif">Payable</span></b></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><i>The
SVB Loan Facility</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">On
June 18, 2021, the Company entered into a $<span id="xdx_906_eus-gaap--LineOfCreditFacilityMaximumBorrowingCapacity_iI_pn6n6_c20210618__us-gaap--TypeOfArrangementAxis__custom--SVBLoanFacilityMember_zYrRHKx65IX7">10
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million loan facility (the &#8220;SVB Loan Facility&#8221;)
with Silicon Valley Bank (&#8220;SVB&#8221;). Celsion immediately used $<span id="xdx_90E_eus-gaap--ProceedsFromLinesOfCredit_pn6n6_c20210601__20210618__us-gaap--TypeOfArrangementAxis__custom--SVBLoanFacilityMember_zRkqre0767zc">6
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million from the SVB Loan Facility to
retire all outstanding indebtedness with Horizon Technology Finance Corporation as further discussed below. Simultaneously with this
transaction, the Company used $<span id="xdx_909_eus-gaap--RestrictedCash_iI_pn6n6_c20210618__us-gaap--TypeOfArrangementAxis__custom--SVBLoanFacilityMember_zs9sNYlNZnDk" title="Restricted cash">6.0</span> million of other available funds to establish a restricted cash account which serves as security for
the SVB Loan Facility. The remaining $<span id="xdx_900_eus-gaap--LineOfCreditFacilityRemainingBorrowingCapacity_iI_pn6n6_c20210618__us-gaap--TypeOfArrangementAxis__custom--SVBLoanFacilityMember_zXeMk2yvXKAe">4
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million will be available to be drawn down up
to 12 months after closing and will be used for working capital and to fund the advancement of the Company&#8217;s product pipeline,
including GEN-1 for the treatment of newly diagnosed advanced ovarian cancer, as well as other strategic initiatives intended to broaden
its product pipeline.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>




<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">The
SVB Loan Facility is in the form of money market secured indebtedness bearing interest at a calculated WSJ Prime-based variable rate
(currently <span id="xdx_901_eus-gaap--DebtInstrumentInterestRateStatedPercentage_c20210618__us-gaap--TypeOfArrangementAxis__custom--SVBLoanFacilityMember_pdd">3.25%</span></span><span style="font: 10pt Times New Roman, Times, Serif">).
A final payment equal to <span id="xdx_907_ecustom--FinalPaymentPercentage_c20210618__us-gaap--TypeOfArrangementAxis__custom--SVBLoanFacilityMember_pdd">3%
</span></span><span style="font: 10pt Times New Roman, Times, Serif">of the total $<span id="xdx_901_eus-gaap--LineOfCredit_iI_pn6n6_c20210618__us-gaap--TypeOfArrangementAxis__custom--SVBLoanFacilityMember_zDU3ysiKCWwa">10
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million commitment amount is due upon maturity
or prepayment of the SVB Loan Facility. There was <span id="xdx_902_eus-gaap--LineOfCreditFacilityCommitmentFeeAmount_pp0p0_do_c20210601__20210618__us-gaap--TypeOfArrangementAxis__custom--SVBLoanFacilityMember_z7RDcVIvd7nc">no
</span></span><span style="font: 10pt Times New Roman, Times, Serif">facility commitment fee and <span id="xdx_908_eus-gaap--DebtConversionConvertedInstrumentWarrantsOrOptionsIssued1_do_c20210601__20210618__us-gaap--TypeOfArrangementAxis__custom--SVBLoanFacilityMember_zxKtZQl2MNTj">no
</span></span><span style="font: 10pt Times New Roman, Times, Serif">stock or warrants were issued to SVB. <span id="xdx_903_eus-gaap--DebtInstrumentDescription_c20210601__20210618__us-gaap--TypeOfArrangementAxis__custom--SVBLoanFacilityMember">Payments
under the loan agreement are interest only for the first 24 months after loan closing, followed by a 24-month amortization period of
principal and interest through the scheduled maturity date.</span></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">In
connection with the SVB Loan Facility, the Company incurred financing fees and expenses totaling $<span id="xdx_90D_eus-gaap--InterestAndDebtExpense_c20210601__20210618__us-gaap--TypeOfArrangementAxis__custom--SVBLoanFacilityMember_pp0p0">243,370
</span></span><span style="font: 10pt Times New Roman, Times, Serif">which is recorded and classified as debt discount
and are being amortized as interest expense using the effective interest method over the life of the loan. Also, in connection with the
SVB Loan Facility, the Company is required to pay an end-of-term fee equal to <span id="xdx_90C_ecustom--EndOfTermChargePercentage_c20210601__20210618__us-gaap--TypeOfArrangementAxis__custom--SVBLoanFacilityMember_pdd">3.0%
</span></span><span style="font: 10pt Times New Roman, Times, Serif">of the original loan amount at time of maturity.
Therefore, these amounts totaling $<span id="xdx_907_eus-gaap--AmortizationOfFinancingCosts_pp0p0_c20210601__20210618__us-gaap--TypeOfArrangementAxis__custom--SVBLoanFacilityMember_zfrGpoPgCuj4">300,000
</span></span><span style="font: 10pt Times New Roman, Times, Serif">were being amortized as interest expense using
the effective interest method over the life of the loan. During the three and six-month periods ended June 30, 2021, the Company incurred
$<span id="xdx_90C_eus-gaap--InterestExpenseDebt_c20210101__20210630__us-gaap--TypeOfArrangementAxis__custom--SVBLoanFacilityMember_pp0p0">7,042
</span></span><span style="font: 10pt Times New Roman, Times, Serif">in interest expense and amortized $<span id="xdx_906_eus-gaap--AmortizationOfFinancingCostsAndDiscounts_pp0p0_c20210101__20210630__us-gaap--TypeOfArrangementAxis__custom--SVBLoanFacilityMember_zCD8P5Rm7fWd">6,457
</span></span><span style="font: 10pt Times New Roman, Times, Serif">as interest expense for debt discounts and end-of-term
fee in connection with the SVB Financing Facility.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p id="xdx_89B_eus-gaap--ScheduleOfMaturitiesOfLongTermDebtTableTextBlock_zA0OrhEcHcg5" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Following
is a schedule of future principal payments, net of unamortized debt discounts and amortized end-of-term fee, due on the SVB Loan
Facility:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;<span id="xdx_8B9_z1LBw1ybetAj" style="display: none">Schedule
of Future Principle Payments, Net of Unamortized Debt Discounts</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; margin-left: auto; border-collapse: collapse; width: 80%; margin-right: auto">
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    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" id="xdx_49B_20210630_zRN0y04DfbZ2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">As
    of June 30,</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_406_eus-gaap--LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths_iI_pp0p0_maDICAzd4S_zGpQzPb0URLc" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">2022</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0998">&#8211;</span></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_401_eus-gaap--LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo_iI_pp0p0_maDICAzd4S_z9GgFD7BPiOi" style="vertical-align: bottom; background-color: White">
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">2023</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl1000">&#8211;</span></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_408_eus-gaap--LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree_iI_pp0p0_maDICAzd4S_zpMClawZJ8k4" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="width: 80%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">2024</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="width: 16%; text-align: right"><span style="font-family: Times New Roman, Times, Serif">3,000,000</span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_408_ecustom--LongTermDebtMaturitiesRepaymentsOfPrincipalYearFourAndThereAfter_iI_pp0p0_maDICAzd4S_z7o7oasIwqk7" style="vertical-align: bottom; background-color: White">
    <td style="text-align: left; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">2025 and</span><span style="font-family: Times New Roman, Times, Serif">
    thereafter</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif">3,000,000</span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_409_eus-gaap--DebtInstrumentCarryingAmount_iTI_pp0p0_mtDICAzd4S_maLTDzrgw_zqnRyTti7kw9" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">Subtotal of future principal payments</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">6,000,000</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_400_eus-gaap--DeferredFinanceCostsNet_iNI_pp0p0_di_msLTDzrgw_zccsqLc8FVH" style="vertical-align: bottom; background-color: White">
    <td style="text-align: left; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">Unamortized debt premium,
    net</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif">(236,913</span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">)</span></td></tr>
  <tr id="xdx_401_eus-gaap--LongTermDebt_iTI_pp0p0_mtLTDzrgw_zXoiqTV25pye" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="padding-left: 10pt; text-align: left; padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">Total</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td style="border-bottom: Black 2.5pt double; text-align: right"><span style="font-family: Times New Roman, Times, Serif">5,763,087</span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  </table>

<p id="xdx_8A9_zy9OfBhf7rOi" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><i>Horizon
Credit Agreement</i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">On
June 27, 2018, the Company entered into a loan agreement with Horizon Technology Finance Corporation (&#8220;Horizon&#8221;) that provided
$<span id="xdx_903_eus-gaap--LineOfCreditFacilityMaximumBorrowingCapacity_iI_pn6n6_c20180627__us-gaap--TypeOfArrangementAxis__custom--InitialHorizonCreditAgreementMember_zkfQB5GOdQAc">10
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million in new capital (the &#8220;Horizon Credit
Agreement&#8221;). The Company drew down $<span id="xdx_904_eus-gaap--ProceedsFromLinesOfCredit_pn6n6_c20180626__20180627__us-gaap--TypeOfArrangementAxis__custom--InitialHorizonCreditAgreementMember_z966F2N1lnT6">10
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million upon closing of the Horizon Credit Agreement
on June 27, 2018. On August 28, 2020, Horizon and the Company amended the Horizon Credit Agreement (the &#8220;Amendment&#8221;) whereby
Celsion repaid $<span id="xdx_90E_eus-gaap--RepaymentsOfNotesPayable_pn6n6_c20200827__20200828__us-gaap--TypeOfArrangementAxis__custom--AmendmentToHorizonCreditAgreementMember__dei--LegalEntityAxis__custom--HorizonTechnologyFinanceCorporationMember_zuJUbukFi259">5
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million of the $10 million loan and $<span id="xdx_905_ecustom--PaymentOfDebtEndTermCharges_pn5n6_c20200827__20200828__us-gaap--TypeOfArrangementAxis__custom--AmendmentToHorizonCreditAgreementMember__dei--LegalEntityAxis__custom--HorizonTechnologyFinanceCorporationMember_z7jYmIYCWGV1">0.2
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million in related end of term charges, and the
remaining $<span id="xdx_90C_eus-gaap--LineOfCreditFacilityRemainingBorrowingCapacity_iI_pn6n6_c20180627__us-gaap--TypeOfArrangementAxis__custom--InitialHorizonCreditAgreementMember_zlsIXpBRHX2d">5
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million in obligations were restructured as set
forth below.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Pursuant
to the Amendment, the remaining $<span id="xdx_908_eus-gaap--DebtInstrumentFaceAmount_iI_pn6n6_c20200828__us-gaap--TypeOfArrangementAxis__custom--AmendmentToHorizonCreditAgreementMember__dei--LegalEntityAxis__custom--HorizonTechnologyFinanceCorporationMember_zce3TW5sOzha">5
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million in obligations of Celsion under the Horizon
Credit Agreement was secured by a first-priority security interest in substantially all assets of Celsion other than intellectual
property assets. <span id="xdx_90A_eus-gaap--DebtInstrumentInterestRateTerms_c20200827__20200828__us-gaap--TypeOfArrangementAxis__custom--AmendmentToHorizonCreditAgreementMember__dei--LegalEntityAxis__custom--HorizonTechnologyFinanceCorporationMember_zH8QZJ3kIg7g">The
obligations bore interest at a rate calculated based an amount by which the one-month LIBOR exceeds 2% plus 7.625%. In no event
shall the interest rate be less than 9.625%. Payments pursuant to the Amendment were interest only for the first twelve (12) months
after August 1, 2020, followed by a 21-month amortization period of principal and interest through the scheduled maturity date on April
1, 2023. In addition, the remaining $5 million in obligations was subject to an end of term fee equal, in the aggregate, to $</span></span><span id="xdx_902_eus-gaap--DebtInstrumentFeeAmount_c20200828__us-gaap--TypeOfArrangementAxis__custom--AmendmentToHorizonCreditAgreementMember__dei--LegalEntityAxis__custom--HorizonTechnologyFinanceCorporationMember_pp0p0" style="font: 10pt Times New Roman, Times, Serif">275,000</span><span style="font: 10pt Times New Roman, Times, Serif">,
which amount was payable upon the maturity of the obligations or upon the date of final payment or default, as applicable. <span id="xdx_90C_eus-gaap--DebtInstrumentRestrictiveCovenants_c20200827__20200828__us-gaap--TypeOfArrangementAxis__custom--AmendmentToHorizonCreditAgreementMember__dei--LegalEntityAxis__custom--HorizonTechnologyFinanceCorporationMember">In
connection with the Amendment, Celsion agreed to a liquidity covenant which provides that, at all times, Celsion shall maintain unrestricted
cash and/or cash equivalents on deposit in accounts over which the applicable Lenders maintain an account control agreement in an amount
not less than $2.5 million. In addition, pursuant to the Amendment, Celsion agreed to provide evidence to Horizon on or before March
31, 2021, that it received aggregate cash proceeds of not less than $5 million from the sale of equity, debt, its New Jersey net operating
losses, or a combination thereof, subsequent to the date of the Amendment.</span></span> <span style="font: 10pt Times New Roman, Times, Serif">The
Company met this requirement during the fourth quarter of 2020.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">In
connection with the Horizon Credit Agreement, the Company incurred financing fees and expenses totaling $<span id="xdx_90C_eus-gaap--InterestAndDebtExpense_c20180626__20180627__us-gaap--TypeOfArrangementAxis__custom--InitialHorizonCreditAgreementMember_pp0p0">175,000
</span></span><span style="font: 10pt Times New Roman, Times, Serif">which were recorded and classified as debt discount.
In addition, the Company paid loan origination fees of $<span id="xdx_90F_eus-gaap--LoanProcessingFee_c20180626__20180627__us-gaap--TypeOfArrangementAxis__custom--InitialHorizonCreditAgreementMember_pp0p0">100,000
</span></span><span style="font: 10pt Times New Roman, Times, Serif">which were recorded and classified as debt discount.
These debt discount amounts totaling $<span id="xdx_90D_eus-gaap--DebtInstrumentUnamortizedDiscount_c20180627__us-gaap--TypeOfArrangementAxis__custom--InitialHorizonCreditAgreementMember_pp0p0">782,116
</span></span><span style="font: 10pt Times New Roman, Times, Serif">were being amortized as interest expense using
the effective interest method over the life of the loan. Also, in connection with each of the Horizon Credit Agreement, the Company was
required to pay an end of term charge equal to <span id="xdx_905_ecustom--EndOfTermChargePercentage_c20180626__20180627__us-gaap--TypeOfArrangementAxis__custom--InitialHorizonCreditAgreementMember_pdd">4.0%
</span></span><span style="font: 10pt Times New Roman, Times, Serif">of the original loan amount at time of maturity.
Therefore, those amounts totaling $<span id="xdx_909_eus-gaap--DeferredFinanceCostsNet_c20180627__us-gaap--TypeOfArrangementAxis__custom--InitialHorizonCreditAgreementMember_pp0p0">400,000
</span></span><span style="font: 10pt Times New Roman, Times, Serif">were being amortized as interest expense using
the effective interest method over the life of the loan.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>




<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">As
a fee in connection with the Horizon Credit Agreement, Celsion issued Horizon warrants exercisable for a total of <span id="xdx_904_eus-gaap--ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights_c20180627__us-gaap--TypeOfArrangementAxis__custom--InitialHorizonCreditAgreementMember__us-gaap--StatementEquityComponentsAxis__us-gaap--CommonStockMember_pdd">190,114
</span></span><span style="font: 10pt Times New Roman, Times, Serif">shares of Celsion&#8217;s common stock (the &#8220;Existing
Warrants&#8221;) at a per share exercise price of $<span id="xdx_907_eus-gaap--ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_c20180627__us-gaap--TypeOfArrangementAxis__custom--InitialHorizonCreditAgreementMember__us-gaap--StatementEquityComponentsAxis__us-gaap--CommonStockMember_pdd">2.63</span></span><span style="font: 10pt Times New Roman, Times, Serif">.
The Horizon Warrants were immediately exercisable for cash or by net exercise from the date of grant and will expire after ten years
from the date of grant. The Company valued the Horizon Warrants issued using the Black-Scholes option pricing model and recorded a total
of $<span id="xdx_90B_eus-gaap--FairValueAdjustmentOfWarrants_c20180626__20180627__us-gaap--TypeOfArrangementAxis__custom--InitialHorizonCreditAgreementMember_pp0p0">507,116
</span></span><span style="font: 10pt Times New Roman, Times, Serif">as a direct deduction from the debt liability,
consistent with the presentation of debt discounts, and are being amortized as interest expense using the effective interest method over
the life of the loan. Pursuant to the Amendment, one-half of the aggregate Existing Warrants, exercisable for a total of <span id="xdx_903_ecustom--ClassOfWarrantOrRightWarrantsOrRightsCancelled_c20200828__us-gaap--TypeOfArrangementAxis__custom--AmendmentToHorizonCreditAgreementMember__dei--LegalEntityAxis__custom--HorizonTechnologyFinanceCorporationMember__us-gaap--StatementEquityComponentsAxis__us-gaap--CommonStockMember_pdd">95,057
</span></span><span style="font: 10pt Times New Roman, Times, Serif">shares of Celsion&#8217;s common stock, have
been canceled, and, in connection with the Amendment, Celsion issued Horizon new warrants exercisable at a per share exercise price equal
to $<span id="xdx_906_eus-gaap--ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_c20200828__us-gaap--TypeOfArrangementAxis__custom--AmendmentToHorizonCreditAgreementMember__dei--LegalEntityAxis__custom--HorizonTechnologyFinanceCorporationMember__us-gaap--StatementEquityComponentsAxis__us-gaap--CommonStockMember_pdd">1.01
</span></span><span style="font: 10pt Times New Roman, Times, Serif">for a total of <span id="xdx_904_eus-gaap--ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights_c20200828__us-gaap--TypeOfArrangementAxis__custom--AmendmentToHorizonCreditAgreementMember__dei--LegalEntityAxis__custom--HorizonTechnologyFinanceCorporationMember__us-gaap--StatementEquityComponentsAxis__us-gaap--CommonStockMember_pdd">247,525
</span></span><span style="font: 10pt Times New Roman, Times, Serif">shares of Celsion&#8217;s common stock (the &#8220;New
Warrants&#8221; and, together with the Existing Warrants, the &#8220;Warrants&#8221;). The remaining <span id="xdx_904_eus-gaap--ClassOfWarrantOrRightOutstanding_c20180627__us-gaap--TypeOfArrangementAxis__custom--InitialHorizonCreditAgreementMember__us-gaap--StatementEquityComponentsAxis__us-gaap--CommonStockMember_pdd">95,057
</span></span><span style="font: 10pt Times New Roman, Times, Serif">Existing Warrants issued in connection with the
Horizon Credit Agreement remain outstanding at a per share exercise price of $2.63.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">The
New Warrants were immediately exercisable for cash or by net exercise from the date of grant and will expire after ten years from
the date of grant. Effective October 27, 2020. The Horizon Credit Agreement contains customary representations, warranties and affirmative
and negative covenants including, among other things, covenants that limit or restrict Celsion&#8217;s ability to grant liens, incur
indebtedness, make certain restricted payments, merge, or consolidate and make dispositions of assets.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">The
Amendment was evaluated in accordance with FASB ASC 470-50, <i>Debt-Modifications and Extinguishments</i>, for debt modification and
extinguishment accounting. We accounted for the $<span id="xdx_904_eus-gaap--PaymentsOfDebtExtinguishmentCosts_pn6n6_c20200827__20200828__us-gaap--TypeOfArrangementAxis__custom--AmendmentToHorizonCreditAgreementMember__dei--LegalEntityAxis__custom--HorizonTechnologyFinanceCorporationMember_zAUWcpet6Cdl">5
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million we repaid as a debt extinguishment thereby
reducing the principal obligations accordingly. Also, in connection with the $5 million repayment, we recognized as interest expense,
approximately $<span id="xdx_909_eus-gaap--DebtInstrumentUnamortizedDiscount_iI_pn5n6_c20200828__us-gaap--TypeOfArrangementAxis__custom--AmendmentToHorizonCreditAgreementMember__dei--LegalEntityAxis__custom--HorizonTechnologyFinanceCorporationMember_zUp1qgaGEWKk">0.2
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million of unamortized debt discount, deferred
financing and end of term fees related to the repaid obligation in August 2020.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">We
accounted for the remaining $5 million of obligation under the Amendment as a debt modification to the initial agreement with respect
to the minor changes in cash flows. Also, in connection with the $5 million remaining obligations, we recorded $<span id="xdx_905_eus-gaap--DeferredFinanceCostsNet_c20200828__us-gaap--TypeOfArrangementAxis__custom--AmendmentToHorizonCreditAgreementMember__dei--LegalEntityAxis__custom--HorizonTechnologyFinanceCorporationMember_pp0p0">5,000
</span></span><span style="font: 10pt Times New Roman, Times, Serif">of financing fees and the New Warrant fair value
of $<span id="xdx_90B_eus-gaap--WarrantsNotSettleableInCashFairValueDisclosure_c20200828__us-gaap--TypeOfArrangementAxis__custom--AmendmentToHorizonCreditAgreementMember__dei--LegalEntityAxis__custom--HorizonTechnologyFinanceCorporationMember_pp0p0">247,548
</span></span><span style="font: 10pt Times New Roman, Times, Serif">as additional debt discount on the $5 million
remaining obligation. Therefore, approximately $<span id="xdx_902_eus-gaap--DebtInstrumentUnamortizedDiscount_c20210630__us-gaap--TypeOfArrangementAxis__custom--AmendmentToHorizonCreditAgreementMember__dei--LegalEntityAxis__custom--HorizonTechnologyFinanceCorporationMember_pp0p0">109,706
</span></span><span style="font: 10pt Times New Roman, Times, Serif">of unamortized debt discount will be amortized
over the remaining life of the new obligations. The $<span id="xdx_903_ecustom--EndOfTermFees_c20180626__20180627__us-gaap--TypeOfArrangementAxis__custom--InitialHorizonCreditAgreementMember_pp0p0">275,000
</span></span><span style="font: 10pt Times New Roman, Times, Serif">of end of term fees, net of previously amortized
end of term fees totaling $<span id="xdx_908_eus-gaap--DebtInstrumentFeeAmount_c20180627__us-gaap--TypeOfArrangementAxis__custom--InitialHorizonCreditAgreementMember_pp0p0">142,605
</span></span><span style="font: 10pt Times New Roman, Times, Serif">previously accrued on the original note associated
with the $5 million remaining obligation, will be amortized as interest expense over the remaining life of the new obligations.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">During
the three and six-month periods ended June 30, 2021, the Company incurred $<span id="xdx_905_eus-gaap--InterestExpenseDebt_pp0p0_c20210401__20210630__us-gaap--DebtInstrumentAxis__custom--InitialHorizonCreditAgreementAmendmentMember_zz3mrabrYijj">105,607
</span></span><span style="font: 10pt Times New Roman, Times, Serif">and $<span id="xdx_906_eus-gaap--InterestExpenseDebt_pp0p0_c20210101__20210630__us-gaap--DebtInstrumentAxis__custom--InitialHorizonCreditAgreementAmendmentMember_zoXmKKqJxf3">225,920</span></span><span style="font: 10pt Times New Roman, Times, Serif">,
respectively, in interest expense and amortized $<span id="xdx_908_eus-gaap--AmortizationOfFinancingCosts_pp0p0_c20210401__20210630__us-gaap--DebtInstrumentAxis__custom--InitialHorizonCreditAgreementAmendmentMember_zx6z5ZvsQLYf">102,126
</span></span><span style="font: 10pt Times New Roman, Times, Serif">and $<span id="xdx_906_eus-gaap--AmortizationOfFinancingCosts_c20210101__20210630__us-gaap--DebtInstrumentAxis__custom--InitialHorizonCreditAgreementAmendmentMember_pp0p0">139,428
</span></span><span style="font: 10pt Times New Roman, Times, Serif">as interest expense for debt discounts and end
of term charges in connection with the Horizon Credit Agreement. During the three and six-month periods ended June 30, 2020, the Company
incurred $<span id="xdx_907_eus-gaap--InterestExpenseDebt_pp0p0_c20200401__20200630__us-gaap--DebtInstrumentAxis__custom--InitialHorizonCreditAgreementAmendmentMember_z8a6wbHwmch1">243,299
</span></span><span style="font: 10pt Times New Roman, Times, Serif">and $<span id="xdx_90C_eus-gaap--InterestExpenseDebt_c20200101__20200630__us-gaap--DebtInstrumentAxis__custom--InitialHorizonCreditAgreementAmendmentMember_pp0p0">486,597</span></span><span style="font: 10pt Times New Roman, Times, Serif">,
respectively, in interest expense and amortized $<span id="xdx_906_eus-gaap--AmortizationOfFinancingCosts_pp0p0_c20200401__20200630__us-gaap--DebtInstrumentAxis__custom--InitialHorizonCreditAgreementAmendmentMember_zXVN04mODJ1i">96,727
</span></span><span style="font: 10pt Times New Roman, Times, Serif">and $<span id="xdx_904_eus-gaap--AmortizationOfFinancingCosts_c20200101__20200630__us-gaap--DebtInstrumentAxis__custom--InitialHorizonCreditAgreementAmendmentMember_pp0p0">192,793</span></span><span style="font: 10pt Times New Roman, Times, Serif">,
respectfully, as interest expense for debt discounts and end of term charges in connection with the Horizon Credit Agreement.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p id="xdx_899_eus-gaap--ScheduleOfDebtTableTextBlock_zxTOtvYAFLbl" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">On
June 18, 2021, as a condition of entering into the SVB Loan Facility, the Company paid the outstanding principal balance,
an early termination fee and the end of term charges in full satisfaction of the Horizon Credit Agreement, as amended.
Following is a schedule of the amounts paid to Horizon on June 18, 2021.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;<span id="xdx_8BB_zkVw8gEY8R8b" style="display: none">Schedule
of Debt</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; margin-left: auto; border-collapse: collapse; width: 80%; margin-right: auto">
  <tr style="vertical-align: bottom; background-color: White">
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
<tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="width: 80%"><span style="font-family: Times New Roman, Times, Serif">Principal balance at June 18, 2021</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_98A_eus-gaap--LineOfCredit_iS_pp0p0_c20210619__20210630__dei--LegalEntityAxis__custom--HorizonTechnologyFinanceCorporationMember_zAmYhkUZFuhk" style="width: 16%; text-align: right" title="Line of credit, beginning balance"><span style="font-family: Times New Roman, Times, Serif">5,000,000</span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
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    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">Early termination fees</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_985_ecustom--EarlyTerminationFees_c20210619__20210630__dei--LegalEntityAxis__custom--HorizonTechnologyFinanceCorporationMember_zgVnQaVJ4SS5" style="text-align: right" title="Early termination fees"><span style="font-family: Times New Roman, Times, Serif">150,000</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
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    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_98D_ecustom--EndOfTermFees_pp0p0_c20210619__20210630__dei--LegalEntityAxis__custom--HorizonTechnologyFinanceCorporationMember_zMGjpuyzQG2i" style="border-bottom: Black 1.5pt solid; text-align: right" title="End of term charges"><span style="font-family: Times New Roman, Times, Serif">275,000</span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td style="padding-left: 10pt; padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">Total</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_986_eus-gaap--LineOfCredit_iE_pp0p0_c20210619__20210630__dei--LegalEntityAxis__custom--HorizonTechnologyFinanceCorporationMember_zD1y3El5W0k4" style="border-bottom: Black 2.5pt double; text-align: right" title="Line of credit, ending balance"><span style="font-family: Times New Roman, Times, Serif">5,425,000</span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
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<p id="xdx_8AC_zWYHsRZk7bzd" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">During
the three and six months ended June 30, 2021, the Company recorded a loss of $<span id="xdx_907_eus-gaap--GainLossOnContractTermination_c20210101__20210630__us-gaap--TypeOfArrangementAxis__custom--HorizonCreditAgreementMember_pp0p0">234,419
</span></span><span style="font: 10pt Times New Roman, Times, Serif">on the termination of the Horizon Credit Agreement,
as amended, which represented the early termination fee and the end of term fees, net of previously amortized interest expense totaling
$<span id="xdx_90A_eus-gaap--InterestExpenseDebt_c20210101__20210630__us-gaap--TypeOfArrangementAxis__custom--HorizonCreditAgreementMember_pp0p0">190,581
</span></span><span style="font: 10pt Times New Roman, Times, Serif">on the date of its payoff.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<span></span>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.</p></div>
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<span style="display: none;">v3.21.2</span><table class="report" border="0" cellspacing="2" id="idm140561281373960">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Stockholders&#8217; Equity<br></strong></div></th>
<th class="th" colspan="1">6 Months Ended</th>
</tr>
<tr><th class="th"><div>Jun. 30, 2021</div></th></tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_EquityAbstract', window );"><strong>Equity [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
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<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockholdersEquityNoteDisclosureTextBlock', window );">Stockholders&#8217; Equity</a></td>
<td class="text"><p id="xdx_80B_eus-gaap--StockholdersEquityNoteDisclosureTextBlock_z4i556ELqwRh" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><b>Note
12. <span id="xdx_827_zwrisun1hGC8">Stockholders&#8217; Equity</span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">In
September 2018, the Company filed with the SEC a $<span id="xdx_90F_ecustom--ShelfRegistrationStatementAmount_pn6n6_c20180901__20180930_z6kOyeRMUEy6">75
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million shelf registration statement on Form
S-3 (the 2018 Shelf Registration Statement) that allows the Company to issue any combination of common stock, preferred stock or warrants
to purchase common stock or preferred stock. This shelf registration was declared effective on October 12, 2018, and was
fully utilized by the end of January 2021.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>




<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">On
March 19, 2021, the Company filed with the SEC a new $<span id="xdx_907_ecustom--ShelfRegistrationStatementAmount_pn6n6_c20210318__20210319_zBrO5S5vboV8">100
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million shelf registration statement on Form
S-3 (the &#8220;2021 Registration Statement&#8221;) that allows the Company to issue any combination of common stock, preferred stock
or warrants to purchase common stock or preferred stock. This shelf registration was declared effective on March 30, 2021.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><i><span style="text-decoration: underline">Capital
on Demand<sup>TM</sup> Sales Agreement</span></i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">On
December 4, 2018, the Company entered into the Capital on Demand Agreement with JonesTrading, pursuant to which the Company may offer
and sell, from time to time, through JonesTrading shares of Common Stock having an aggregate offering price of up to $<span id="xdx_905_ecustom--AggregateOfferingPrices_pn5n6_c20181202__20181204__us-gaap--TypeOfArrangementAxis__custom--CapitalOnDemandTMSalesAgreementMember_zjxEhECp5K63">16.0
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">During
2020 through June 30, 2020, the Company sold and issued an aggregate of <span id="xdx_906_eus-gaap--StockIssuedDuringPeriodSharesNewIssues_pn5n6_c20200101__20200630__us-gaap--TypeOfArrangementAxis__custom--CapitalOnDemandAgreementMember_zSm2pkR5U73i">1.2
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million shares under the Capital on Demand
Agreement, receiving approximately $<span id="xdx_900_eus-gaap--ProceedsFromIssuanceOfCommonStock_pn5n6_c20200101__20200630__us-gaap--TypeOfArrangementAxis__custom--CapitalOnDemandAgreementMember_zCADWbcV9O0h">3.5
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million in gross proceeds. During the first
half of 2021, the Company sold <span id="xdx_906_eus-gaap--StockIssuedDuringPeriodSharesNewIssues_pn5n6_c20210101__20210331__us-gaap--TypeOfArrangementAxis__custom--CapitalOnDemandAgreementMember_zHPWaFmPEmU">7.2
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million shares under the Capital on Demand Agreement,
receiving approximately $<span id="xdx_905_eus-gaap--ProceedsFromIssuanceOfCommonStock_pn5n6_c20210101__20210331__us-gaap--TypeOfArrangementAxis__custom--CapitalOnDemandAgreementMember_zXHcc671V5Pg">6.9
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million in gross proceeds under the Capital on
Demand Agreement.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><i><span style="text-decoration: underline">Registered
Direct Offering</span></i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">On
February 27, 2020, we entered into a Securities Purchase Agreement (the &#8220;February 2020 Purchase Agreement&#8221;) with several
institutional investors, pursuant to which we agreed to issue and sell, in a registered direct offering (the &#8220;February 2020
Offering&#8221;), an aggregate of <span id="xdx_90F_eus-gaap--StockIssuedDuringPeriodSharesNewIssues_pid_c20200226__20200227__us-gaap--TypeOfArrangementAxis__custom--SecuritiesPurchaseAgreementMember_zUAhIVI0k3lb">4,571,428 </span></span><span style="font: 10pt Times New Roman, Times, Serif">shares
of our common stock at an offering price of $<span id="xdx_90A_eus-gaap--SharesIssuedPricePerShare_iI_pid_c20200227__us-gaap--TypeOfArrangementAxis__custom--SecuritiesPurchaseAgreementMember_zQxwlSRowZd2">1.05 </span></span><span style="font: 10pt Times New Roman, Times, Serif">per
Share for gross proceeds of approximately $<span id="xdx_905_eus-gaap--ProceedsFromIssuanceOfCommonStock_pn5n6_c20200226__20200227__us-gaap--TypeOfArrangementAxis__custom--SecuritiesPurchaseAgreementMember_zoT3KNK5lUu5">4.8 </span></span><span style="font: 10pt Times New Roman, Times, Serif">million
before the deduction of the Placement Agent fees and offering expenses. In a concurrent private placement (the &#8220;Private
Placement&#8221;), the Company issued to the investors that participated in the February 2020 Offering, for no additional
consideration, warrants to purchase up to <span id="xdx_90C_eus-gaap--ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight_c20200227__us-gaap--TypeOfArrangementAxis__custom--SecuritiesPurchaseAgreementMember__us-gaap--StatementEquityComponentsAxis__custom--OriginalWarrantsMember_pdd">2,971,428 </span></span><span style="font: 10pt Times New Roman, Times, Serif">shares
of common stock (the &#8220;Original Warrants&#8221;). The Original Warrants were initially exercisable six months following their
date of issue and were set to expire on the <span id="xdx_903_eus-gaap--WarrantsAndRightsOutstandingTerm_iI_dxL_c20200227__us-gaap--TypeOfArrangementAxis__custom--SecuritiesPurchaseAgreementMember__us-gaap--StatementEquityComponentsAxis__custom--OriginalWarrantsMember_zLhLDfQ92Fj" title="::XDX::P5Y"><span style="-sec-ix-hidden: xdx2ixbrl1072">five-year</span></span></span><span style="font: 10pt Times New Roman, Times, Serif">
anniversary of such initial exercise date. The Original Warrants had an exercise price of $<span id="xdx_907_eus-gaap--ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_iI_pid_c20200227__us-gaap--TypeOfArrangementAxis__custom--SecuritiesPurchaseAgreementMember__us-gaap--StatementEquityComponentsAxis__custom--OriginalWarrantsMember_zzQ0oUkx6I1e">1.15 </span></span><span style="font: 10pt Times New Roman, Times, Serif">per
share subject to adjustment as provided therein. On March 12, 2020, the Company entered into private exchange agreements (the
&#8220;Exchange Agreements&#8221;) with holders of the Original Warrants. Pursuant to the Exchange Agreements, in return for a
higher exercise price of $<span id="xdx_90D_eus-gaap--ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_iI_pid_c20200312__us-gaap--TypeOfArrangementAxis__custom--ExchangeAgreementsMember__us-gaap--StatementEquityComponentsAxis__us-gaap--WarrantMember_zmBGdzB62lid">1.24 </span></span><span style="font: 10pt Times New Roman, Times, Serif">per
share of common stock, the Company issued new warrants to the Investors to purchase up to <span id="xdx_904_eus-gaap--ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight_iI_pid_c20200312__us-gaap--TypeOfArrangementAxis__custom--ExchangeAgreementsMember__us-gaap--StatementEquityComponentsAxis__us-gaap--WarrantMember_zDxruSt2GUpl">3,200,000 </span></span><span style="font: 10pt Times New Roman, Times, Serif">shares
of common stock (the &#8220;Exchange Warrants&#8221;) in exchange for the Original Warrants. The Exchange Warrants, like the
Original Warrants, are initially exercisable six months following their issuance (the &#8220;Initial Exercise Date&#8221;) and
expire on the <span id="xdx_90A_eus-gaap--WarrantsAndRightsOutstandingTerm_iI_dxL_c20200312__us-gaap--TypeOfArrangementAxis__custom--ExchangeAgreementsMember__us-gaap--StatementEquityComponentsAxis__us-gaap--WarrantMember_zvInSFBdHo4c" title="::XDX::P5Y"><span style="-sec-ix-hidden: xdx2ixbrl1076">five-year</span></span></span><span style="font: 10pt Times New Roman, Times, Serif">
anniversary of their Initial Exercise Date. Other than having a higher exercise price, different issue date, Initial Exercise Date
and expiration date, the terms of the Exchange Warrants are identical to those of the Original Warrants. On July 31, 2020, the
Company filed a Form S-3 Registration Statement to register the shares of common stock issuable under the Exchange Warrants; the
Registration Statement was declared effective by the SEC on August 13, 2020. No Exchange Warrants were exercised during 2020. During
2021 through the date of this Quarterly Report on Form 10-Q, the Company issued <span id="xdx_90D_eus-gaap--ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight_iI_pn5n6_c20210630__us-gaap--TypeOfArrangementAxis__custom--ExchangeAgreementsMember_zfIt5TJCsBY6">1.2 </span></span><span style="font: 10pt Times New Roman, Times, Serif">million
shares pursuant to investors exercising Exchange Warrants, receiving approximately $<span id="xdx_90C_eus-gaap--ProceedsFromIssuanceOfWarrants_pn5n6_c20210101__20210630__us-gaap--TypeOfArrangementAxis__custom--ExchangeAgreementsMember_zTmpheC7YDWj">1.5 </span></span><span style="font: 10pt Times New Roman, Times, Serif">million in
net proceeds.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><i><span style="text-decoration: underline">Underwritten
Offering</span></i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">On
June 22, 2020, the Company entered into an underwriting agreement (the &#8220;Underwriting Agreement&#8221;) with Oppenheimer &amp; Co.
Inc. (the &#8220;Underwriter&#8221;), relating to the issuance and sale (the &#8220;Underwritten Offering&#8221;) of <span id="xdx_90A_eus-gaap--StockIssuedDuringPeriodSharesNewIssues_c20200621__20200622__us-gaap--TypeOfArrangementAxis__custom--UnderwritingAgreementMember__us-gaap--SubsidiarySaleOfStockAxis__custom--UnderwrittenOfferingMember_zuYZrzK0hDlb">2,666,667
</span></span><span style="font: 10pt Times New Roman, Times, Serif">shares of the Company&#8217;s common stock. Pursuant
to the terms of the Underwriting Agreement, the Underwriter agreed to purchase the shares at a price of $<span id="xdx_903_eus-gaap--SharePrice_c20200622__us-gaap--TypeOfArrangementAxis__custom--UnderwritingAgreementMember__us-gaap--SubsidiarySaleOfStockAxis__custom--UnderwrittenOfferingMember_pdd">3.4875
</span></span><span style="font: 10pt Times New Roman, Times, Serif">per share. The Underwriter offered the shares
at a public offering price of $<span id="xdx_907_eus-gaap--SharesIssuedPricePerShare_c20200622__us-gaap--TypeOfArrangementAxis__custom--UnderwritingAgreementMember__us-gaap--SubsidiarySaleOfStockAxis__custom--UnderwrittenOfferingMember_pdd">3.75
</span></span><span style="font: 10pt Times New Roman, Times, Serif">per share, reflecting an underwriting discount
equal to $<span id="xdx_909_ecustom--UnderwritingDiscountPricePerShare_c20200621__20200622__us-gaap--TypeOfArrangementAxis__custom--UnderwritingAgreementMember__us-gaap--SubsidiarySaleOfStockAxis__custom--UnderwrittenOfferingMember_pdd">0.2625</span></span><span style="font: 10pt Times New Roman, Times, Serif">,
or <span id="xdx_90E_ecustom--PercentageOfUnderwritingDiscountOnPublicOfferingPrice_c20200621__20200622__us-gaap--TypeOfArrangementAxis__custom--UnderwritingAgreementMember__us-gaap--SubsidiarySaleOfStockAxis__custom--UnderwrittenOfferingMember_pdd">7.0%
</span></span><span style="font: 10pt Times New Roman, Times, Serif">of the public offering price. The net proceeds
to the Company from the Underwritten Offering, after deducting the underwriting discount and estimated offering expenses payable by the
Company, were approximately $<span id="xdx_900_eus-gaap--ProceedsFromIssuanceOfCommonStock_pn5n6_c20200621__20200622__us-gaap--TypeOfArrangementAxis__custom--UnderwritingAgreementMember__us-gaap--SubsidiarySaleOfStockAxis__custom--UnderwrittenOfferingMember_zQIpLXo9Qdhi">9.1
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Pursuant
to the Underwriting Agreement, until December 31, 2020, the Underwriter had a right of first refusal to act as sole underwriter, initial
purchaser, placement/selling agent, or arranger, as the case may be, on any new financing for the Company (excluding equipment lease
financings, loans or grants from governmental authorities or in connection with government programs and financings relating to or sales
of tax attributes) during such period. The Underwriter common stock the sole right to determine whether or not any other broker dealer
shall have the right to participate in any such offering and the economic terms of any such participation.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><i><span style="text-decoration: underline">January
2021 Registered Direct Offering</span></i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">On
January 22, 2021, the Company entered into a Securities Purchase Agreement (the &#8220;January 2021 Purchase Agreement&#8221;) with several
institutional investors, pursuant to which the Company agreed to issue and sell, in a registered direct offering (the &#8220;January
2021 Offering&#8221;), an aggregate of <span id="xdx_900_eus-gaap--StockIssuedDuringPeriodSharesNewIssues_pid_c20210121__20210122__us-gaap--TypeOfArrangementAxis__custom--UnderwritingAgreementMember__us-gaap--SubsidiarySaleOfStockAxis__custom--JanuaryRegisteredDirectOfferingMember_zasU5swSYTMh">25,925,925
</span></span><span style="font: 10pt Times New Roman, Times, Serif">shares of the Company&#8217;s common stock at
an offering price of $<span id="xdx_904_eus-gaap--SharePrice_iI_pid_c20210122__us-gaap--TypeOfArrangementAxis__custom--UnderwritingAgreementMember__us-gaap--SubsidiarySaleOfStockAxis__custom--JanuaryRegisteredDirectOfferingMember_zr11OwB61xAk">1.35
</span></span><span style="font: 10pt Times New Roman, Times, Serif">per share for gross proceeds of approximately
$<span id="xdx_907_eus-gaap--ProceedsFromIssuanceOfCommonStock_pn6n6_c20210121__20210122__us-gaap--TypeOfArrangementAxis__custom--UnderwritingAgreementMember__us-gaap--SubsidiarySaleOfStockAxis__custom--JanuaryRegisteredDirectOfferingMember_zd15X3MYAhDf">35
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million before the deduction of the January 2021
Placement Agents (as defined below) fee and offering expenses. The January 2021 Purchase Agreement contains customary representations,
warranties and agreements by the Company and customary conditions to closing. The closing of the January 2021 Offering occurred on January
26, 2021.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>




<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span id="xdx_907_ecustom--PlacementAgentFeeDescription_c20210121__20210122__us-gaap--TypeOfArrangementAxis__custom--UnderwritingAgreementMember__us-gaap--SubsidiarySaleOfStockAxis__custom--JanuaryRegisteredDirectOfferingMember" style="font: 10pt Times New Roman, Times, Serif">In
connection with the January 2021 Offering, the Company entered into a placement agent agreement (the &#8220;January 2021 Placement Agent
Agreement&#8221;) with A.G.P./Alliance Global Partners (together with Brookline Capital Markets, the &#8220;January 2021 Placement Agents&#8221;)
pursuant to which the Company agreed to pay the January 2021 Placement Agents a cash fee equal to 7% of the aggregate gross proceeds
raised from the sale of the securities sold in the January 2021 Offering and reimburse the January 2021 Placement Agents for certain
of their expenses in an amount not to exceed $82,500.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><i><span style="text-decoration: underline">March
2021 Registered Direct Offering</span></i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">On
March 31, 2021, the Company entered into a Securities Purchase Agreement (the &#8220;March 2021 Purchase Agreement&#8221;) with several
institutional investors, pursuant to which the Company agreed to issue and sell, in a registered direct offering (the &#8220;March 2021
Offering&#8221;), an aggregate of <span id="xdx_90F_eus-gaap--StockIssuedDuringPeriodSharesNewIssues_pid_c20210301__20210331__us-gaap--TypeOfArrangementAxis__custom--UnderwritingAgreementMember__us-gaap--SubsidiarySaleOfStockAxis__custom--MarchRegisteredDirectOfferingMember_zdtgwFzakQy9">11,538,462
</span></span><span style="font: 10pt Times New Roman, Times, Serif">shares of the Company&#8217;s common stock, at
an offering price of $<span id="xdx_904_eus-gaap--SharePrice_iI_pid_c20210331__us-gaap--TypeOfArrangementAxis__custom--UnderwritingAgreementMember__us-gaap--SubsidiarySaleOfStockAxis__custom--MarchRegisteredDirectOfferingMember_z7sC1OPpVPib">1.30
</span></span><span style="font: 10pt Times New Roman, Times, Serif">per share for gross proceeds of approximately
$<span id="xdx_90B_eus-gaap--ProceedsFromIssuanceOfCommonStock_pn6n6_c20210301__20210331__us-gaap--TypeOfArrangementAxis__custom--UnderwritingAgreementMember__us-gaap--SubsidiarySaleOfStockAxis__custom--MarchRegisteredDirectOfferingMember_zXxKK5h5EZul">15
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million before the deduction of the placement
agents fee and offering expenses. The shares were offered by the Company pursuant to the 2021 Registration Statement. The closing of
the Offering occurred on April 5, 2021.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span id="xdx_908_ecustom--PlacementAgentFeeDescription_c20210301__20210331__us-gaap--TypeOfArrangementAxis__custom--UnderwritingAgreementMember__us-gaap--SubsidiarySaleOfStockAxis__custom--MarchRegisteredDirectOfferingMember_zNVsqgMVK1J7" style="font: 10pt Times New Roman, Times, Serif">In
connection with the March 2021 Offering, the Company entered into a placement agent agreement (the &#8220;March 2021 Placement Agent
Agreement&#8221;) with A.G.P./Alliance Global Partners, as lead placement agent (&#8220;AGP,&#8221; and together with JonesTrading Institutional
Services LLC and Brookline Capital Markets, a division of Arcadia Securities, LLC, serving as co-placement agents, the &#8220;March 2021
Placement Agents&#8221;) pursuant to which the Company agreed to pay the March 2021 Placement Agents an aggregate cash fee equal to 7%
of the aggregate gross proceeds raised from the sale of the securities sold in the Offering and reimburse the Placement Agents for certain
of their expenses in an amount not to exceed $82,500.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Under
the March 2021 Purchase Agreement and March 2021 Placement Agent Agreement, the Company and its subsidiaries are prohibited, for a period
of 90 days after the closing, from entering into any agreement to issue or announcing any issuance or proposed issuance of common stock
or any other securities that are at any time convertible into, or exercisable or exchangeable for, or otherwise entitle the holder thereof
to receive common stock without the prior written consent of AGP or the investors participating in the offering. For purposes of this
offering, AGP and the investors from the Company&#8217;s January 2021 Offering waived a similar 90-day restriction in the placement agent
agreement and purchase agreement for that transaction.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><i><span style="text-decoration: underline">LPC
Purchase Agreement</span></i></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">On
September 8, 2020, the Company entered into a purchase agreement (the &#8220;LPC Purchase Agreement&#8221;) and a Registration Rights
Agreement (the &#8220;Registration Rights Agreement&#8221;) with Lincoln Park Capital Fund, LLC (&#8220;Lincoln Park&#8221;), pursuant
to which, upon the terms and subject to the conditions and limitations set forth therein, the Company has the right to sell to Lincoln
Park up to $<span id="xdx_905_eus-gaap--StockIssuedDuringPeriodSharesNewIssues_pn5n6_c20200907__20200908__us-gaap--TypeOfArrangementAxis__custom--LPCPurchaseAgreementMember__dei--LegalEntityAxis__custom--LincolnParkCapitalFundLLCMember_zjznHtlrf8kh">26.0
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million of shares of the Company&#8217;s common
stock at the Company&#8217;s discretion as described below (the &#8220;LPC Offering&#8221;). During 2020, the Company sold and issued
an aggregate of <span id="xdx_90C_eus-gaap--StockIssuedDuringPeriodSharesNewIssues_pn5n6_c20200101__20201231__us-gaap--TypeOfArrangementAxis__custom--LPCPurchaseAgreementMember__dei--LegalEntityAxis__custom--LincolnParkCapitalFundLLCMember_z85zqYLDSQCd">3.3
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million shares, including the <span id="xdx_905_eus-gaap--StockIssuedDuringPeriodSharesNewIssues_c20200907__20200908__us-gaap--TypeOfArrangementAxis__custom--LPCPurchaseAgreementMember__dei--LegalEntityAxis__custom--LincolnParkCapitalFundLLCMember__us-gaap--StatementEquityComponentsAxis__custom--LPCCommitmentSharesMember_pdd">437,828
</span></span><span style="font: 10pt Times New Roman, Times, Serif">commitment shares, under the LPC Purchase Agreement,
receiving approximately $<span id="xdx_90F_eus-gaap--ProceedsFromIssuanceOfCommonStock_pn5n6_c20200101__20201231__us-gaap--TypeOfArrangementAxis__custom--LPCPurchaseAgreementMember__dei--LegalEntityAxis__custom--LincolnParkCapitalFundLLCMember_ztWQLGUmWN6">2.2
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million in gross proceeds. On January
21, 2021, the Company terminated the LPC Purchase Agreement. The Company did not sell any shares under the LPC Purchase Agreement
in 2021.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<span></span>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income.</p></div>
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<span style="display: none;">v3.21.2</span><table class="report" border="0" cellspacing="2" id="idm140561281301688">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Stock-Based Compensation<br></strong></div></th>
<th class="th" colspan="1">6 Months Ended</th>
</tr>
<tr><th class="th"><div>Jun. 30, 2021</div></th></tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract', window );"><strong>Share-based Payment Arrangement [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock', window );">Stock-Based Compensation</a></td>
<td class="text"><p id="xdx_80A_eus-gaap--DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_zlOPbZ1JNyq4" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><b>Note
13. <span id="xdx_827_z8STTSt0mLsi">Stock-Based Compensation</span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">The
Company has long-term compensation plans that permit the granting of equity-based awards in the form of stock options, restricted stock,
restricted stock units, stock appreciation rights, other stock awards, and performance awards.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">At
the 2018 Annual Stockholders Meeting of the Company held on May 15, 2018, stockholders approved the Celsion Corporation 2018 Stock Incentive
Plan (the &#8220;2018 Plan&#8221;). The 2018 Plan, as adopted, permits the granting of <span id="xdx_900_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_c20210630__us-gaap--PlanNameAxis__custom--TwoThousandAndEighteenStockIncentivePlanMember_pdd">2,700,000
</span></span><span style="font: 10pt Times New Roman, Times, Serif">shares of Celsion common stock as equity awards
in the form of incentive stock options, nonqualified stock options, restricted stock, restricted stock units, stock appreciation rights,
other stock awards, performance awards, or in any combination of the foregoing. At the 2019 Annual Stockholders Meeting of the Company
held on May 14, 2019, stockholders approved an amendment to the 2018 Plan whereby the Company increased the number of common stock shares
available by <span id="xdx_906_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_iI_c20190514__us-gaap--PlanNameAxis__custom--TwoThousandAndEighteenStockIncentivePlanMember__srt--RangeAxis__srt--MinimumMember_zLqi5XRg0ysh">1,200,000
</span></span><span style="font: 10pt Times New Roman, Times, Serif">to a total of <span id="xdx_90E_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_iI_c20190514__us-gaap--PlanNameAxis__custom--TwoThousandAndEighteenStockIncentivePlanMember__srt--RangeAxis__srt--MaximumMember_z1yrVQy1CBnh">3,900,000
</span></span><span style="font: 10pt Times New Roman, Times, Serif">under the 2018 Plan, as amended. Prior to the
adoption of the 2018 Plan, the Company had maintained the Celsion Corporation 2007 Stock Incentive Plan (the &#8220;2007 Plan&#8221;).
At the 2020 Annual Stockholders Meeting of the Company held on June 15, 2020, stockholders approved an amendment to the 2018 Plan, as
previously amended, whereby the Company increased the number of shares of common stock available by <span id="xdx_90D_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_c20200615__us-gaap--PlanNameAxis__custom--TwoThousandAndEighteenStockIncentivePlanMember__srt--RangeAxis__srt--MinimumMember_pdd">2,500,000
</span></span><span style="font: 10pt Times New Roman, Times, Serif">to a total of <span id="xdx_90F_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_c20200615__us-gaap--PlanNameAxis__custom--TwoThousandAndEighteenStockIncentivePlanMember__srt--RangeAxis__srt--MaximumMember_pdd">6,400,000
</span></span><span style="font: 10pt Times New Roman, Times, Serif">under the 2018 Plan, as amended. At the 2021
Annual Stockholders Meeting of the Company held on June 10, 2020, stockholders approved an amendment to the 2018 Plan, as previously
amended, whereby the Company increased the number of shares of common stock available by <span id="xdx_902_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_iI_c20210610__us-gaap--PlanNameAxis__custom--TwoThousandAndEighteenStockIncentivePlanMember__srt--RangeAxis__srt--MinimumMember_zkv7ydFVwj2">7,700,000
</span></span><span style="font: 10pt Times New Roman, Times, Serif">to a total of <span id="xdx_90F_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_iI_c20210610__us-gaap--PlanNameAxis__custom--TwoThousandAndEighteenStockIncentivePlanMember__srt--RangeAxis__srt--MaximumMember_z0Zgx5xDVRQ6">14,100,000
</span></span><span style="font: 10pt Times New Roman, Times, Serif">under the 2018 Plan, as amended.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">The
Company has issued stock awards to employees and directors in the form of stock options and restricted stock. <span id="xdx_901_ecustom--StockOptionsStrikePriceDescription_c20210101__20210630__us-gaap--PlanNameAxis__custom--TwoThousandSevenStockIncentivePlanMember">Options
are generally granted with strike prices equal to the fair market value of a share of Celsion common stock on the date of grant. Incentive
stock options may be granted to purchase shares of common stock at a price not less than 100% of the fair market value of the underlying
shares on the date of grant, provided that the exercise price of any incentive stock option granted to an eligible employee owning more
than 10% of the outstanding stock of Celsion must be at least 110% of such fair market value on the date of grant. Only officers and
key employees may receive incentive stock options.</span></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>




<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Option
and restricted stock awards vest upon terms determined by the Compensation Committee of the Board of Directors and are subject to accelerated
vesting in the event of a change of control or certain terminations of employment. The Company issues new shares to satisfy its obligations
from the exercise of options or the grant of restricted stock awards.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">On
September 28, 2018, and again on February 19, 2019, the Compensation Committee of the Board of Directors approved the grant of (i)
inducement stock options (the &#8220;Inducement Option Grants&#8221;) to purchase a total of <span id="xdx_90C_eus-gaap--SharesIssued_c20180928__us-gaap--PlanNameAxis__custom--InducementOptionGrantsMember__srt--TitleOfIndividualAxis__custom--FiveNewEmployeesMember__us-gaap--StatementEquityComponentsAxis__us-gaap--CommonStockMember_pdd">164,004 </span></span><span style="font: 10pt Times New Roman, Times, Serif">and <span id="xdx_907_eus-gaap--SharesIssued_c20190219__us-gaap--PlanNameAxis__custom--InducementOptionGrantsMember__srt--TitleOfIndividualAxis__custom--FiveNewEmployeesMember__us-gaap--StatementEquityComponentsAxis__us-gaap--CommonStockMember_pdd">140,004 </span></span><span style="font: 10pt Times New Roman, Times, Serif">shares
of Celsion common stock, respectively and (ii) inducement restricted stock awards (the &#8220;Inducement Stock Grants&#8221;)
totaling <span id="xdx_90D_eus-gaap--SharesIssued_c20180928__us-gaap--PlanNameAxis__custom--InducementOptionGrantsMember__srt--TitleOfIndividualAxis__custom--FiveNewEmployeesMember__us-gaap--AwardTypeAxis__us-gaap--RestrictedStockMember_pdd">19,000 </span></span><span style="font: 10pt Times New Roman, Times, Serif">and <span id="xdx_906_eus-gaap--SharesIssued_c20190219__us-gaap--PlanNameAxis__custom--InducementOptionGrantsMember__srt--TitleOfIndividualAxis__custom--FiveNewEmployeesMember__us-gaap--AwardTypeAxis__us-gaap--RestrictedStockMember_pdd">13,000 </span></span><span style="font: 10pt Times New Roman, Times, Serif">shares
of Celsion common stock to five new employees collectively. Each award has a grant date of the date of grant. Each Inducement Option
Grant has an exercise price per share equal to $<span id="xdx_908_eus-gaap--ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_c20180927__20180928__us-gaap--PlanNameAxis__custom--InducementOptionGrantsMember__srt--TitleOfIndividualAxis__custom--FiveNewEmployeesMember_pdd">2.77 </span></span><span style="font: 10pt Times New Roman, Times, Serif">and
$<span id="xdx_907_eus-gaap--ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_c20190218__20190219__us-gaap--PlanNameAxis__custom--InducementOptionGrantsMember__srt--TitleOfIndividualAxis__custom--FiveNewEmployeesMember_pdd">2.18 </span></span><span style="font: 10pt Times New Roman, Times, Serif">which
represents the closing price of Celsion&#8217;s common stock as reported by Nasdaq on September 28, 2018 and February 19, 2019,
respectively. Each Inducement Option Grant will vest over <span id="xdx_901_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_dc_c20190218__20190219__us-gaap--PlanNameAxis__custom--InducementOptionGrantsMember__srt--TitleOfIndividualAxis__custom--FiveNewEmployeesMember_zg6B4KigMCR1">three years</span>, with one-third vesting on the one-year anniversary of the
employee&#8217;s first day of employment with the Company and one-third vesting on the second and third anniversaries thereafter,
subject to the new employee&#8217;s continued service relationship with the Company on each such date. Each Inducement Option Grant
has a ten-year term and is subject to the terms and conditions of the applicable stock option agreement. Each of Inducement Stock
Grant vested on the one-year anniversary of the employee&#8217;s first day of employment with the Company is subject to the new
employee&#8217;s continued service relationship with the Company through such date and is subject to the terms and conditions of the
applicable restricted stock agreement.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">As
of June 30, 2021, there were a total of <span id="xdx_907_eus-gaap--CommonStockCapitalSharesReservedForFutureIssuance_c20210630__us-gaap--PlanNameAxis__custom--TwoThousandAndEighteenStockIncentivePlanMember_pdd">14,198,424
</span></span><span style="font: 10pt Times New Roman, Times, Serif">shares of Celsion common stock reserved for
issuance under the 2018 Plan, which were comprised of <span id="xdx_909_eus-gaap--CommonStockCapitalSharesReservedForFutureIssuance_c20210630__us-gaap--AwardTypeAxis__custom--EquityStockAwardsMember__srt--StatementScenarioAxis__custom--GrantedUnderTwoThousandEighteenPlanAndTwoThousandSevenPlanMember_pdd">6,548,325
</span></span><span style="font: 10pt Times New Roman, Times, Serif">shares of Celsion common stock subject to equity
awards previously granted under the 2018 Plan and 2007 Plan and <span id="xdx_90E_eus-gaap--CommonStockCapitalSharesReservedForFutureIssuance_iI_c20210630__us-gaap--PlanNameAxis__custom--TwoThousandAndEighteenPlanMember_z956AaBaeSe6">7,650,099
</span></span><span style="font: 10pt Times New Roman, Times, Serif">shares of Celsion common stock available for
future issuance under the 2018 Plan. As of June 30, 2021, there were a total of <span id="xdx_90D_eus-gaap--CommonStockCapitalSharesReservedForFutureIssuance_iI_c20210630__us-gaap--AwardTypeAxis__custom--InducementAwardsMember_zxqedVkaaaz3">140,004
</span></span><span style="font: 10pt Times New Roman, Times, Serif">shares of Celsion common stock subject to outstanding
inducement awards.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Total
compensation cost related to stock options and restricted stock awards amounted to $<span id="xdx_90D_eus-gaap--AllocatedShareBasedCompensationExpense_pp0p0_c20210401__20210630__us-gaap--AwardTypeAxis__custom--EmployeeStockOptionAndRestrictedStockAwardsMember_zOmXtm9Xb4T7">793,619
</span></span><span style="font: 10pt Times New Roman, Times, Serif">and $<span id="xdx_906_eus-gaap--AllocatedShareBasedCompensationExpense_pp0p0_c20200401__20200630__us-gaap--AwardTypeAxis__custom--EmployeeStockOptionAndRestrictedStockAwardsMember_zmb9KxLh1xzg">578,761
</span></span><span style="font: 10pt Times New Roman, Times, Serif">for the three-month periods ended June 30, 2021
and 2020, respectively. Of these amounts, $<span id="xdx_902_eus-gaap--AllocatedShareBasedCompensationExpense_pp0p0_c20210401__20210630__us-gaap--AwardTypeAxis__custom--EmployeeStockOptionAndRestrictedStockAwardsMember__us-gaap--IncomeStatementLocationAxis__us-gaap--ResearchAndDevelopmentExpenseMember_zvAXbhtQ8ii9">299,581
</span></span><span style="font: 10pt Times New Roman, Times, Serif">and $<span id="xdx_90B_eus-gaap--AllocatedShareBasedCompensationExpense_pp0p0_c20200401__20200630__us-gaap--AwardTypeAxis__custom--EmployeeStockOptionAndRestrictedStockAwardsMember__us-gaap--IncomeStatementLocationAxis__us-gaap--ResearchAndDevelopmentExpenseMember_zo7odFA6jb2j">200,186
</span></span><span style="font: 10pt Times New Roman, Times, Serif">was charged to research and development during
the three-month periods ended June 30, 2021 and 2020, respectively, and $<span id="xdx_908_eus-gaap--AllocatedShareBasedCompensationExpense_pp0p0_c20210401__20210630__us-gaap--AwardTypeAxis__custom--EmployeeStockOptionAndRestrictedStockAwardsMember__us-gaap--IncomeStatementLocationAxis__us-gaap--GeneralAndAdministrativeExpenseMember_zsTEVS685Fp7">494,038
</span></span><span style="font: 10pt Times New Roman, Times, Serif">and $<span id="xdx_908_eus-gaap--AllocatedShareBasedCompensationExpense_pp0p0_c20200401__20200630__us-gaap--AwardTypeAxis__custom--EmployeeStockOptionAndRestrictedStockAwardsMember__us-gaap--IncomeStatementLocationAxis__us-gaap--GeneralAndAdministrativeExpenseMember_z0BVdkASGh58">378,575
</span></span><span style="font: 10pt Times New Roman, Times, Serif">was charged to general and administrative expenses
during the three-month periods ended June 30, 2021 and 2020, respectively.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Total
compensation cost related to stock options and restricted stock awards amounted to $<span id="xdx_90B_eus-gaap--AllocatedShareBasedCompensationExpense_c20210101__20210630__us-gaap--AwardTypeAxis__custom--EmployeeStockOptionAndRestrictedStockAwardsMember_pp0p0">2,372,945
</span></span><span style="font: 10pt Times New Roman, Times, Serif">and $<span id="xdx_909_eus-gaap--AllocatedShareBasedCompensationExpense_c20200101__20200630__us-gaap--AwardTypeAxis__custom--EmployeeStockOptionAndRestrictedStockAwardsMember_pp0p0">1,030,726
</span></span><span style="font: 10pt Times New Roman, Times, Serif">for the six-month periods ended June 30, 2021
and 2020, respectively. Of these amounts, $<span id="xdx_904_eus-gaap--AllocatedShareBasedCompensationExpense_c20210101__20210630__us-gaap--AwardTypeAxis__custom--EmployeeStockOptionAndRestrictedStockAwardsMember__us-gaap--IncomeStatementLocationAxis__us-gaap--ResearchAndDevelopmentExpenseMember_pp0p0">882,088
</span></span><span style="font: 10pt Times New Roman, Times, Serif">and $<span id="xdx_90B_eus-gaap--AllocatedShareBasedCompensationExpense_c20200101__20200630__us-gaap--AwardTypeAxis__custom--EmployeeStockOptionAndRestrictedStockAwardsMember__us-gaap--IncomeStatementLocationAxis__us-gaap--ResearchAndDevelopmentExpenseMember_pp0p0">378,122
</span></span><span style="font: 10pt Times New Roman, Times, Serif">was charged to research and development during
the six-month periods ended June 30, 2021 and 2020, respectively, and $<span id="xdx_900_eus-gaap--AllocatedShareBasedCompensationExpense_c20210101__20210630__us-gaap--AwardTypeAxis__custom--EmployeeStockOptionAndRestrictedStockAwardsMember__us-gaap--IncomeStatementLocationAxis__us-gaap--GeneralAndAdministrativeExpenseMember_pp0p0">1,490,857
</span></span><span style="font: 10pt Times New Roman, Times, Serif">and $<span id="xdx_902_eus-gaap--AllocatedShareBasedCompensationExpense_c20200101__20200630__us-gaap--AwardTypeAxis__custom--EmployeeStockOptionAndRestrictedStockAwardsMember__us-gaap--IncomeStatementLocationAxis__us-gaap--GeneralAndAdministrativeExpenseMember_pp0p0">652,604
</span></span><span style="font: 10pt Times New Roman, Times, Serif">was charged to general and administrative expenses
during the six-month periods ended June 30, 2021 and 2020, respectively.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">As
of June 30, 2021, there was $<span id="xdx_903_eus-gaap--EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_iI_pn5n6_c20210630_zNzij1mXPAQe">3.2
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million of total unrecognized compensation cost
related to non-vested stock-based compensation arrangements. That cost is expected to be recognized over a weighted-average period of
<span id="xdx_906_eus-gaap--EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_dtY_c20210101__20210630_zE9oLHUCHx4d">1.2
</span></span><span style="font: 10pt Times New Roman, Times, Serif">years. The weighted average grant date fair values
of the stock options granted was $<span id="xdx_907_eus-gaap--ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_c20210101__20210630_pdd">1.98
</span></span><span style="font: 10pt Times New Roman, Times, Serif">and $<span id="xdx_90A_eus-gaap--ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_c20200101__20200630_pdd">3.10
</span></span><span style="font: 10pt Times New Roman, Times, Serif">during the six-month periods ended June 30, 2021
and 2020, respectively. A summary of stock option awards and restricted stock grants for the three-months ended June 30, 2021 is presented
below:</span></p>

<p id="xdx_897_ecustom--SummaryOfStockOptionAndRestrictedStockAwardsTableTextBlock_zdNvlcpS5MWa" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span id="xdx_8B5_zdwapitkW4Tb" style="font: 10pt Times New Roman, Times, Serif; display: none">Summary
of Stock Option Awards and Restricted Stock Grants</span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="vertical-align: bottom">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="6" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">Stock
    Options</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="6" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">Restricted
    Stock Awards</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>Weighted</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>Average</b></span></p></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>Options</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>Outstanding</b></span></p></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>Weighted</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>Average</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>Exercise</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>Price</b></span></p></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>Non-vested</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>Restricted</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>Stock</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>Outstanding</b></span></p></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>Weighted</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>Average</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>Grant</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>Date</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>Fair
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  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="width: 35%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">Equity awards outstanding at January
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    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_987_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_iS_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zs8NivCzWEJl" style="width: 9%; text-align: right" title="Number Outstanding, Outstanding, Beginning balance"><span style="font-family: Times New Roman, Times, Serif">4,624,725</span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_98E_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_iS_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zjNzVF9yzIq2" style="width: 9%; text-align: right" title="Weighted Average Exercise Price, Outstanding, Beginning balance"><span style="font-family: Times New Roman, Times, Serif">2.77</span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_984_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_iS_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--RestrictedStockMember_zqUlMKUubbcj" style="width: 9%; text-align: right" title="Number Outstanding, Non-vested stock awards, Outstanding, Beginning balance"><span style="font-family: Times New Roman, Times, Serif">2,750</span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_987_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_iS_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--RestrictedStockMember_z740gWcrLMA3" style="width: 9%; text-align: right" title="Weighted Average Grant Date Fair Value, Non-vested stock awards, Outstanding, Beginning balance"><span style="font-family: Times New Roman, Times, Serif">0.89</span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="width: 9%; text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">Equity awards granted</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_986_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_pdd" style="text-align: right" title="Number Outstanding, Options granted"><span style="font-family: Times New Roman, Times, Serif">2,154,000</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_986_eus-gaap--ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_pdd" style="text-align: right" title="Weighted Average Exercise Price, Options granted"><span style="font-family: Times New Roman, Times, Serif">2.18</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_987_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--RestrictedStockMember_pdd" style="text-align: right" title="Number Outstanding, Non-vested stock awards, Granted"><span style="font-family: Times New Roman, Times, Serif">7,000</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_98E_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--RestrictedStockMember_pdd" style="text-align: right" title="Weighted Average Grant Date Fair Value, Non-vested stock awards, Granted"><span style="font-family: Times New Roman, Times, Serif">1.38</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">Equity awards exercised or vested and issued</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_980_eus-gaap--StockIssuedDuringPeriodSharesStockOptionsExercised_iN_di_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zz9vwH6dwF9d" style="text-align: right" title="Number Outstanding, Options exercised or vested and issued"><span style="font-family: Times New Roman, Times, Serif">(7,500</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">)</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_985_eus-gaap--ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_pdd" style="text-align: right" title="Weighted Average Exercise Price, Options exercised or vested and issued"><span style="font-family: Times New Roman, Times, Serif">0.63</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_984_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--RestrictedStockMember_pdd" style="text-align: right" title="Number Outstanding, Non-vested stock awards, exercised or vested and issued"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl1157">-</span></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_98A_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--RestrictedStockMember_pdd" style="text-align: right" title="Weighted Average Grant Date Fair Value, Non-vested stock awards, exercised or vested and issued"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl1159">-</span></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">Equity awards forfeited,
    cancelled or expired</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_983_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod_iN_di_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zfFZt1TlTe2f" style="border-bottom: Black 1.5pt solid; text-align: right" title="Number Outstanding, Options canceled or expired"><span style="font-family: Times New Roman, Times, Serif">(92,646</span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">)</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_981_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_pdd" style="padding-bottom: 1.5pt; text-align: right" title="Weighted Average Exercise Price, Options canceled or expired"><span style="font-family: Times New Roman, Times, Serif">2.69</span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_98B_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--RestrictedStockMember_pdd" style="border-bottom: Black 1.5pt solid; text-align: right" title="Number Outstanding, Non-vested stock awards, Forfeited"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl1165">-</span></span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_98E_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--RestrictedStockMember_pdd" style="padding-bottom: 1.5pt; text-align: right" title="Weighted Average Grant Date Fair Value, Non-vested stock awards, Forfeited"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl1167">-</span></span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt; text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left; padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">Equity awards outstanding
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  <tr style="vertical-align: bottom; background-color: White">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left; padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">Aggregate intrinsic
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    <td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt; text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt; text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left; padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">Equity awards exercisable
    at June 30, 2021</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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    <td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt; text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt; text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt; text-align: right"><span id="xdx_90A_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_dtY_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_ziiBCIpqp7bb" style="font-family: Times New Roman, Times, Serif">7.8</span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left; padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">Aggregate intrinsic
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    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_984_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1_iE_pp0p0_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zY55dMDQ9Goa" style="border-bottom: Black 2.5pt double; text-align: right" title="Aggregate Intrinsic Value, Exercisable, Ending balance"><span style="font-family: Times New Roman, Times, Serif">1,650</span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt; text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt; text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt; text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt; text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  </table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></p>

<p id="xdx_8A1_z5CbKCmiKN2l" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>




<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p id="xdx_89C_eus-gaap--ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock_zvVrpPRBlNSd" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">The
fair values of stock options granted were estimated at the date of grant using the Black-Scholes option pricing model. The Black-Scholes
model was originally developed for use in estimating the fair value of traded options, which have different characteristics from Celsion&#8217;s
stock options. The model is also sensitive to changes in assumptions, which can materially affect the fair value estimate. The Company
used the following assumptions for determining the fair value of options granted under the Black-Scholes option pricing model:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;<span id="xdx_8B1_zAvmRlNBERij" style="display: none">Schedule
of Assumptions Used to Determine Fair Value of Options Granted</span></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"/>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
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                                            Months Ended June 30, &#160;</b></span></td><td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1.5pt; text-align: left"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1.5pt"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif; padding-bottom: 1.5pt"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: bold 10pt Times New Roman, Times, Serif; padding-bottom: 1.5pt; text-align: left"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 1.5pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">2021</span></td><td style="font: bold 10pt Times New Roman, Times, Serif; padding-bottom: 1.5pt; text-align: left"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif; padding-bottom: 1.5pt"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: bold 10pt Times New Roman, Times, Serif; padding-bottom: 1.5pt; text-align: left"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 1.5pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">2020</span></td><td style="font: bold 10pt Times New Roman, Times, Serif; padding-bottom: 1.5pt; text-align: left"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; width: 60%; text-align: left"><span style="font: 10pt Times New Roman, Times, Serif">Risk-free
    interest rate</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 2%"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 16%; text-align: right"><span id="xdx_90C_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum_pid_dp_c20210101__20210630_zbHSZSVsxGng" style="font: 10pt Times New Roman, Times, Serif">1.56
                                            </span><span style="font: 10pt Times New Roman, Times, Serif">to <span id="xdx_90C_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum_pid_dp_c20210101__20210630_z61dC6LUBpG7">1.74</span></span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font: 10pt Times New Roman, Times, Serif">%</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 2%"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 16%; text-align: right"><span id="xdx_90D_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum_pid_dp_c20200101__20200630_zsBDu6znfba7" style="font: 10pt Times New Roman, Times, Serif">0.71
                                            </span><span style="font: 10pt Times New Roman, Times, Serif">to <span id="xdx_903_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum_pid_dp_c20200101__20200630_z4h3tRgTmWW3">1.33</span></span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">%</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font: 10pt Times New Roman, Times, Serif">Expected
    volatility</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span id="xdx_908_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum_pid_dp_c20210101__20210630_zOviDMd7lCtf" style="font: 10pt Times New Roman, Times, Serif">106.8
                                            </span><span style="font: 10pt Times New Roman, Times, Serif">to <span id="xdx_904_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum_pid_dp_c20210101__20210630_zY4Mod2WgDI">113.0</span></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif">%</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span id="xdx_901_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum_pid_dp_c20200101__20200630_zNHIZ28tcg1d" style="font: 10pt Times New Roman, Times, Serif">100.4
                                            </span><span style="font: 10pt Times New Roman, Times, Serif">to <span id="xdx_904_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum_pid_dp_c20200101__20200630_zmTjM8Vk6KF7">104.2</span></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font: 10pt Times New Roman, Times, Serif">%</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font: 10pt Times New Roman, Times, Serif">Expected
    life (in years)</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span id="xdx_90D_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_dtY_c20210101__20210630__srt--RangeAxis__srt--MinimumMember_zUnxBpAcWXsk" style="font: 10pt Times New Roman, Times, Serif">7.5
                                            </span><span style="font: 10pt Times New Roman, Times, Serif">to <span id="xdx_904_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_dtY_c20210101__20210630__srt--RangeAxis__srt--MaximumMember_ziitPTyChS7f">10.0</span></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font: 10pt Times New Roman, Times, Serif">&#160;<span id="xdx_903_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_dtY_c20200101__20200630__srt--RangeAxis__srt--MinimumMember_z68gZQbmans4">8.5
                                            </span></span><span style="font: 10pt Times New Roman, Times, Serif">to
                                            <span id="xdx_901_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_dtY_c20200101__20200630__srt--RangeAxis__srt--MaximumMember_zW5npx7wLpgg">10.0</span></span><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font: 10pt Times New Roman, Times, Serif">Expected
    dividend yield</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_98F_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_pid_dpxL_c20210101__20210630_zIH0kzCyLy2g" style="font: 10pt Times New Roman, Times, Serif; text-align: right" title="Expected dividend yield::XDX::0"><span style="font: 10pt Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl1203">-</span></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font: 10pt Times New Roman, Times, Serif">%</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_981_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_pid_dpxL_c20200101__20200630_zv50SIQiZlGk" style="font: 10pt Times New Roman, Times, Serif; text-align: right" title="Expected dividend yield::XDX::0"><span style="font: 10pt Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl1205">-</span></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font: 10pt Times New Roman, Times, Serif">%</span></td></tr>
  </table>

<p id="xdx_8A3_z2lHzkFiftZ1" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Expected
volatilities utilized in the model are based on historical volatility of the Company&#8217;s stock price. The risk-free interest rate
is derived from values assigned to U.S. Treasury bonds with terms that approximate the expected option lives in effect at the time of
grant.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<span></span>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The entire disclosure for share-based payment arrangement.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -URI http://asc.fasb.org/topic&amp;trid=2228938<br></p></div>
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<span style="display: none;">v3.21.2</span><table class="report" border="0" cellspacing="2" id="idm140561282584296">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Earn-Out Milestone Liability<br></strong></div></th>
<th class="th" colspan="1">6 Months Ended</th>
</tr>
<tr><th class="th"><div>Jun. 30, 2021</div></th></tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_DisclosureEarnoutMilestoneLiabilityAbstract', window );"><strong>Earn-out Milestone Liability</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_EarnoutMilestoneLiabilityDisclosureTextBlock', window );">Earn-Out Milestone Liability</a></td>
<td class="text"><p id="xdx_801_ecustom--EarnoutMilestoneLiabilityDisclosureTextBlock_zWkAYpPd0my2" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><b>Note
14. <span id="xdx_820_zevo1lJWXTn">Earn-Out Milestone Liability</span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">On
March 28, 2019, the Company and EGWU, Inc, entered into an amendment to its purchase agreement (&#8220;Amended Asset Purchase Agreement&#8221;),
whereby payment of the earnout milestone liability related to the Ovarian Cancer Indication of $<span id="xdx_90F_ecustom--EarnoutMilestoneLiability1_iI_pn5n6_c20190328__us-gaap--TypeOfArrangementAxis__custom--AmendedAssetPurchaseAgreementMember__us-gaap--RelatedPartyTransactionAxis__custom--AchievingMilestoneWithInOneYearMember_zKFdi26YYdQf">12.4
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million had been modified. The Company has the
option to make the payment as follows:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">a)</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">$<span id="xdx_903_ecustom--EarnoutMilestoneLiability1_iI_pn5n6_c20190328__us-gaap--TypeOfArrangementAxis__custom--AmendedAssetPurchaseAgreementMember__us-gaap--RelatedPartyTransactionAxis__custom--CertainBusinessDaysOfAchievingMilestoneMember_zsLTm1kmMUok">7.0
    </span></span><span style="font: 10pt Times New Roman, Times, Serif">million in cash within 10 business days of
    achieving the milestone; or</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">b)</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">$<span id="xdx_901_ecustom--EarnoutMilestoneLiability1_iI_pn5n6_c20190328__us-gaap--TypeOfArrangementAxis__custom--AmendedAssetPurchaseAgreementMember_zWYkwwuaJn8d">12.4
    </span></span><span style="font: 10pt Times New Roman, Times, Serif">million in cash, common stock of the Company,
    or a combination of either, within one year of achieving the milestone.</span></td></tr>
  </table>
<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">As
of June 30, 2021, March 31, 2021, and December 31, 2020, the Company fair valued the earn-out milestone liability at $<span id="xdx_907_eus-gaap--BusinessCombinationConsiderationTransferredLiabilitiesIncurred_pn5n6_c20210101__20210630__us-gaap--BusinessAcquisitionAxis__custom--EGWCMember__us-gaap--TypeOfArrangementAxis__custom--FairValueEarnoutMilestoneLiabilityMember_zjvRVWZhGx1c">7.1
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million, $<span id="xdx_909_eus-gaap--BusinessCombinationConsiderationTransferredLiabilitiesIncurred_pn5n6_c20210101__20210331__us-gaap--BusinessAcquisitionAxis__custom--EGWCMember__us-gaap--TypeOfArrangementAxis__custom--FairValueEarnoutMilestoneLiabilityMember_z6g6Qd6I8Dqc">7.2
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million and $<span id="xdx_906_eus-gaap--BusinessCombinationConsiderationTransferredLiabilitiesIncurred_pn5n6_c20200101__20201231__us-gaap--BusinessAcquisitionAxis__custom--EGWCMember__us-gaap--TypeOfArrangementAxis__custom--FairValueEarnoutMilestoneLiabilityMember_zfxlEFu7gUWe">7.0
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million, respectively, and recognized a non-cash
benefit of $<span id="xdx_900_ecustom--NoncashChargeOnEarnoutMilestoneLiability_pn5n6_c20210401__20210630__us-gaap--BusinessAcquisitionAxis__custom--EGWCMember_zkTm03nK4Z6c">0.1
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million for the three-months ended June 30, 2021
and a non-cash charge of $<span id="xdx_909_ecustom--NoncashChargeOnEarnoutMilestoneLiability_pn5n6_c20210101__20210630__us-gaap--BusinessAcquisitionAxis__custom--EGWCMember_zMn6JPDjG6Ea">0.1
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million for the six-months ended June 30, 2021.
<span id="xdx_90C_ecustom--EarnoutPaymentOptionsDescription_c20210101__20210630__us-gaap--BusinessAcquisitionAxis__custom--EGWCMember">In
assessing the earnout milestone liability at June 30, 2021 and March 31, 2021, the Company fair valued each of the two payment options
per the Amended Asset Purchase Agreement and weighted them at 50% / 50% probability for the $7.0 million and the $12.4 million payments,
respectively.</span></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">As
of June 30, 2020, March 31, 2020, and December 31, 2019, the Company fair valued the earn-out milestone liability at $<span id="xdx_903_eus-gaap--BusinessCombinationConsiderationTransferredLiabilitiesIncurred_pn5n6_c20200101__20200630__us-gaap--BusinessAcquisitionAxis__custom--EGWCMember__us-gaap--TypeOfArrangementAxis__custom--FairValueEarnoutMilestoneLiabilityMember_zdUaHYWPIH78">6.0
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million, $<span id="xdx_90F_eus-gaap--BusinessCombinationConsiderationTransferredLiabilitiesIncurred_pn5n6_c20200101__20200331__us-gaap--BusinessAcquisitionAxis__custom--EGWCMember__us-gaap--TypeOfArrangementAxis__custom--FairValueEarnoutMilestoneLiabilityMember_ziEPznTBpyw6">5.8
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million,</span><span style="font: 10pt Times New Roman, Times, Serif">
and $<span id="xdx_907_eus-gaap--BusinessCombinationConsiderationTransferredLiabilitiesIncurred_pn5n6_c20190101__20191231__us-gaap--BusinessAcquisitionAxis__custom--EGWCMember__us-gaap--TypeOfArrangementAxis__custom--FairValueEarnoutMilestoneLiabilityMember_zsBFzoSykRF5">5.7
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million, respectively and recognized a non-cash
charge of $<span id="xdx_905_ecustom--NoncashChargeOnEarnoutMilestoneLiability_pn5n6_c20200401__20200630__us-gaap--BusinessAcquisitionAxis__custom--EGWCMember_zHV7NOomI5m">0.2
</span></span><span style="font: 10pt Times New Roman, Times, Serif">and $<span id="xdx_903_ecustom--NoncashChargeOnEarnoutMilestoneLiability_pn5n6_c20200101__20200630__us-gaap--BusinessAcquisitionAxis__custom--EGWCMember_zmg9dSrazTr3">0.3
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million for the three-month and six-month periods
ended June 30, 2020, respectively. <span id="xdx_90A_ecustom--EarnoutPaymentOptionsDescription_c20200101__20200630__us-gaap--BusinessAcquisitionAxis__custom--EGWCMember">In
assessing the earnout milestone liability at June 30, 2020 and March 31, 2020, the Company fair valued each of the two payment options
per the Amended Asset Purchase Agreement and weighted them at 80% / 20% probability for the $7.0 million and the $12.4 million
payments, respectively.</span></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p id="xdx_896_ecustom--ScheduleOfChangesInEarnOutMilestoneLiabilitiesTableTextBlock_zg2vwNiSH1K5" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">The
following is a summary of the changes in the earn-out milestone liability for the six-month period ended June 30, 2021:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;<span id="xdx_8B2_z8jvCwx4n2j5" style="display: none">Schedule
of Changes in Earn-out Milestone Liability</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="display: none; vertical-align: bottom; background-color: White">
    <td style="display: none; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="display: none"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="display: none; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="display: none; text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="display: none; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
<tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="width: 80%"><span style="font-family: Times New Roman, Times, Serif">Balance at January 1, 2021</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_981_ecustom--EarnoutMilestoneLiability_iS_pp0p0_c20210101__20210630_zfgHFwac9LC5" style="width: 16%; text-align: right" title="Earn-out liabilities, beginning balance"><span style="font-family: Times New Roman, Times, Serif">(7,018,000</span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">)</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td style="text-align: left; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">Non-cash loss from the
    change in fair value</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_98A_ecustom--GainLossFromChangeInFairValueOfEarnOutMilestoneLiability_c20210101__20210630_pp0p0" style="border-bottom: Black 1.5pt solid; text-align: right" title="Non-cash gain loss from the adjustment for the change in fair value"><span style="font-family: Times New Roman, Times, Serif">(70,000</span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">)</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">Balance at June 30, 2021</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_98A_ecustom--EarnoutMilestoneLiability_iE_pp0p0_c20210101__20210630_zF3silNymLdi" style="border-bottom: Black 2.5pt double; text-align: right" title="Earn-out liabilities, ending balance"><span style="font-family: Times New Roman, Times, Serif">(7,088,000</span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">)</span></td></tr>
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<p id="xdx_8A1_zh5NamNYDdCg" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p id="xdx_898_ecustom--ScheduleOfRiskadjustmentAssessmentTableTextBlock_zO1NEdKx5kH" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">The
following is a schedule of the Company&#8217;s risk-adjustment assessment of each milestone:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;<span id="xdx_8BD_zLRJ6Thwwb7i" style="display: none">Schedule
of Risk Adjustment Assessment</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="vertical-align: bottom">
    <td style="border-bottom: Black 1.5pt solid; text-align: center"><span style="font-family: Times New Roman, Times, Serif">Date</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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                                            Achieving Each Milestone</b></span></p></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"><span style="font-family: Times New Roman, Times, Serif">Discount
    Rate</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: center"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>Estimated
                                            Time</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>to
                                            Achieve</b></span></p></td></tr>
  <tr style="vertical-align: bottom">
    <td style="text-align: justify"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="text-align: center"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="text-align: center"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: center"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="width: 44%; text-align: justify"><span style="font-family: Times New Roman, Times, Serif">June 30, 2021</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_98C_ecustom--RiskadjustmentAssessmentOfAchievingMilestone_pid_dp_c20210101__20210630_ztRZNKc1f1I" style="width: 13%; text-align: right" title="Risk-adjustment Assessment of achieving each Milestone"><span style="font-family: Times New Roman, Times, Serif">80</span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">%</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_983_ecustom--DiscountRatesOnMileStoneLiabilities_pid_dp_c20210101__20210630_ztDD9dRCkHqj" style="width: 13%; text-align: right" title="Discount Rate"><span style="font-family: Times New Roman, Times, Serif">9</span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">%</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 20%; text-align: right"><span id="xdx_90B_ecustom--EstimatedTimeToAchieveMileStone_dtY_c20210101__20210630__srt--RangeAxis__srt--MinimumMember_ztCH7vWA4Fdg" style="font-family: Times New Roman, Times, Serif">0.42
    </span><span style="font-family: Times New Roman, Times, Serif">to <span id="xdx_906_ecustom--EstimatedTimeToAchieveMileStone_dtY_c20210101__20210630__srt--RangeAxis__srt--MaximumMember_zevrFDAxNcCi">1.42
    </span></span><span style="font-family: Times New Roman, Times, Serif">years</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td style="text-align: justify"><span style="font-family: Times New Roman, Times, Serif">March 31, 2021</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_98A_ecustom--RiskadjustmentAssessmentOfAchievingMilestone_pid_dp_c20210101__20210331_zY1Iv8PYEvyc" style="text-align: right" title="Risk-adjustment Assessment of achieving each Milestone"><span style="font-family: Times New Roman, Times, Serif">80</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">%</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_98D_ecustom--DiscountRatesOnMileStoneLiabilities_pid_dp_c20210101__20210331_zvh5TKmdNpp1" style="text-align: right" title="Discount Rate"><span style="font-family: Times New Roman, Times, Serif">9</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">%</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: right"><span id="xdx_907_ecustom--EstimatedTimeToAchieveMileStone_dtY_c20210101__20210331__srt--RangeAxis__srt--MinimumMember_z2v5sX2fdw75" style="font-family: Times New Roman, Times, Serif">0.29
    </span><span style="font-family: Times New Roman, Times, Serif">to <span id="xdx_901_ecustom--EstimatedTimeToAchieveMileStone_dtY_c20210101__20210331__srt--RangeAxis__srt--MaximumMember_zv6kYZh3KWK1">1.29
    </span></span><span style="font-family: Times New Roman, Times, Serif">years</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: justify"><span style="font-family: Times New Roman, Times, Serif">December 31, 2020</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_982_ecustom--RiskadjustmentAssessmentOfAchievingMilestone_pid_dp_c20200101__20201231_zmiycbmZaiel" style="text-align: right" title="Risk-adjustment Assessment of achieving each Milestone"><span style="font-family: Times New Roman, Times, Serif">80</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">%</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_980_ecustom--DiscountRatesOnMileStoneLiabilities_pid_dp_c20200101__20201231_zuXh5ODTXFGg" style="text-align: right" title="Discount Rate"><span style="font-family: Times New Roman, Times, Serif">9</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">%</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: right"><span id="xdx_90C_ecustom--EstimatedTimeToAchieveMileStone_dtY_c20200101__20201231__srt--RangeAxis__srt--MinimumMember_zmbUCcKbn2fb" style="font-family: Times New Roman, Times, Serif">0.54
    </span><span style="font-family: Times New Roman, Times, Serif">to <span id="xdx_902_ecustom--EstimatedTimeToAchieveMileStone_dtY_c20200101__20201231__srt--RangeAxis__srt--MaximumMember_zmJM2FABs6Vf">1.54
    </span></span><span style="font-family: Times New Roman, Times, Serif">years</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td style="text-align: justify"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: justify"><span style="font-family: Times New Roman, Times, Serif">June 30, 2020</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_988_ecustom--RiskadjustmentAssessmentOfAchievingMilestone_pid_dp_c20200101__20200630_zGc1e3DNHwwj" style="text-align: right" title="Risk-adjustment Assessment of achieving each Milestone"><span style="font-family: Times New Roman, Times, Serif">80</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">%</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_983_ecustom--DiscountRatesOnMileStoneLiabilities_pid_dp_c20200101__20200630_zX0YcalEWrh7" style="text-align: right" title="Discount Rate"><span style="font-family: Times New Roman, Times, Serif">9</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">%</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: right"><span id="xdx_90C_ecustom--EstimatedTimeToAchieveMileStone_dtY_c20200101__20200630__srt--RangeAxis__srt--MinimumMember_zt7tUOXUIJAf" style="font-family: Times New Roman, Times, Serif">0.54
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  <tr style="vertical-align: bottom; background-color: White">
    <td style="text-align: justify"><span style="font-family: Times New Roman, Times, Serif">March 31, 2020</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_98E_ecustom--RiskadjustmentAssessmentOfAchievingMilestone_pid_dp_c20200101__20200331_zM3RagkkzXQh" style="text-align: right" title="Risk-adjustment Assessment of achieving each Milestone"><span style="font-family: Times New Roman, Times, Serif">80</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">%</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_98D_ecustom--DiscountRatesOnMileStoneLiabilities_pid_dp_c20200101__20200331_zSl9XdEFA8i8" style="text-align: right" title="Discount Rate"><span style="font-family: Times New Roman, Times, Serif">9</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">%</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: right"><span id="xdx_903_ecustom--EstimatedTimeToAchieveMileStone_dtY_c20200101__20200331__srt--RangeAxis__srt--MinimumMember_zTxJcY5cbtB8" style="font-family: Times New Roman, Times, Serif">1.04
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  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: justify"><span style="font-family: Times New Roman, Times, Serif">December 31, 2019</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_98D_ecustom--DiscountRatesOnMileStoneLiabilities_pid_dp_c20190101__20191231_zD0krJglEmxi" style="text-align: right" title="Discount Rate"><span style="font-family: Times New Roman, Times, Serif">9</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">%</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: right"><span id="xdx_909_ecustom--EstimatedTimeToAchieveMileStone_dtY_c20190101__20191231__srt--RangeAxis__srt--MinimumMember_zytePsubsX1c" style="font-family: Times New Roman, Times, Serif">1.12
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<p id="xdx_8A4_zqKPVn7iWL7c" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><b>&#160;</b></span></p>




<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif"><b>&#160;</b></span></p>

<span></span>
</td>
</tr>
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<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">CLSN_DisclosureEarnoutMilestoneLiabilityAbstract</td>
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<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Earnout Milestone Liability Disclosure [Text Block]</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">CLSN_EarnoutMilestoneLiabilityDisclosureTextBlock</td>
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<td><strong> Balance Type:</strong></td>
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<span style="display: none;">v3.21.2</span><table class="report" border="0" cellspacing="2" id="idm140561281324568">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Warrants<br></strong></div></th>
<th class="th" colspan="1">6 Months Ended</th>
</tr>
<tr><th class="th"><div>Jun. 30, 2021</div></th></tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_DisclosureWarrantsAbstract', window );"><strong>Warrants</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_WarrantsTextBlock', window );">Warrants</a></td>
<td class="text"><p id="xdx_80F_ecustom--WarrantsTextBlock_zf8qffPJ69p5" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><b>Note
15. <span id="xdx_820_zsC0SEq00lV8">Warrants</span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p id="xdx_89A_eus-gaap--ScheduleOfStockholdersEquityNoteWarrantsOrRightsTextBlock_zyLOReG12MB1" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Following
is a summary of all warrant activity for the six months ended June 30, 2021:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;<span id="xdx_8B5_zuNPNjGPNfbh" style="display: none">Summary
of Warrant Activity</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="vertical-align: bottom">
    <td style="border-bottom: Black 1.5pt solid"><span style="font-family: Times New Roman, Times, Serif">Warrants</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>Number
                                            of<br/> Warrants</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>Issued</b></span></p></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>Weighted</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>Average</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>Exercise
                                            Price</b></span></p></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="width: 60%"><span style="font-family: Times New Roman, Times, Serif">Warrants outstanding at December 31, 2020</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_981_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber_iS_c20210101__20210630_zAhiFozzRZib" style="width: 16%; text-align: right" title="Number of Warrants Issued, Warrants outstanding, Beginning balance"><span style="font-family: Times New Roman, Times, Serif">3,853,566</span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_989_ecustom--ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingWeightedAverageExercisePrice_iS_c20210101__20210630_zqVVyHompmr8" style="width: 16%; text-align: right" title="Weighted Average Exercise Price, Warrants outstanding, Beginning balance"><span style="font-family: Times New Roman, Times, Serif">1.35</span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">Warrants exercised during the six
    months ended June 30, 2021 (see Note 12)</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_98F_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised_iN_di_c20210101__20210630_zHPeBD6O7QY5" style="border-bottom: Black 1.5pt solid; text-align: right" title="Number of Warrants Issued, Warrants exercised"><span style="font-family: Times New Roman, Times, Serif">(1,216,667</span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">)</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_988_ecustom--ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExerciseInPeriodWeightedAverageExercisePrice_c20210101__20210630_pdd" style="padding-bottom: 1.5pt; text-align: right" title="Weighted Average Exercise Price, Warrants exercised"><span style="font-family: Times New Roman, Times, Serif">1.24</span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">Warrants outstanding at June 30,
    2021</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_98A_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber_iE_c20210101__20210630_zBZnYIt9d2i2" style="border-bottom: Black 2.5pt double; text-align: right" title="Number of Warrants Issued, Warrants outstanding, Ending balance"><span style="font-family: Times New Roman, Times, Serif">2,636,899</span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_98B_ecustom--ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingWeightedAverageExercisePrice_iE_c20210101__20210630_zHc7RRbT6gP6" style="padding-bottom: 2.5pt; text-align: right" title="Weighted Average Exercise Price, Warrants outstanding, Ending balance"><span style="font-family: Times New Roman, Times, Serif">1.40</span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">Aggregate intrinsic value of outstanding
    warrants at June 30, 2021</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_98A_ecustom--ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionsOutstandingIntrinsicValue_iE_pp0p0_c20210101__20210630_zvgKs6wzw12k" style="border-bottom: Black 2.5pt double; text-align: right" title="Aggregate intrinsic value of outstanding warrants"><span style="font-family: Times New Roman, Times, Serif">159,857</span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt; text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td><span style="font-family: Times New Roman, Times, Serif">Weighted average remaining contractual terms at June 30, 2021</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span id="xdx_90E_ecustom--SharebasedCompensationArrangementBySharebasedPaymentAwardNonOptionsOutstandingWeightedAverageRemainingContractualTerm2_dtY_c20210101__20210630_ztBClSvcASZk" style="font: 10pt Times New Roman, Times, Serif">4.6
                                            </span><span style="font: 10pt Times New Roman, Times, Serif">years</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  </table>

<p id="xdx_8AC_zR7J2T3aIpdh" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<span></span>
</td>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
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<span style="display: none;">v3.21.2</span><table class="report" border="0" cellspacing="2" id="idm140561281200456">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Leases<br></strong></div></th>
<th class="th" colspan="1">6 Months Ended</th>
</tr>
<tr><th class="th"><div>Jun. 30, 2021</div></th></tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_DisclosureLeasesAbstract', window );"><strong>Leases</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_LesseeOperatingLeasesTextBlock', window );">Leases</a></td>
<td class="text"><p id="xdx_803_eus-gaap--LesseeOperatingLeasesTextBlock_z9DkxzCfoEOl" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><b>Note
16. <span id="xdx_823_zMZbPyAA0R7j">Leases</span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span id="xdx_908_eus-gaap--LesseeOperatingLeaseDescription_c20110701__20110731" style="font: 10pt Times New Roman, Times, Serif">In
2011, the Company executed a lease (the &#8220;Lease&#8221;) with Brandywine Operating Partnership, L.P. (Brandywine), a Delaware
limited partnership, for a </span><span id="xdx_904_eus-gaap--AreaOfLand_iI_uSqft_c20110731_zBXAAeWbCo04" style="font: 10pt Times New Roman, Times, Serif">10,870
square foot premises located in Lawrenceville, New Jersey and relocated its offices to Lawrenceville, New Jersey from Columbia,
Maryland. The Lease had an initial term of </span><span id="xdx_900_eus-gaap--LesseeOperatingLeaseTermOfContract_iI_dtM_c20110731_zRZ2AjYuutEl" style="font: 10pt Times New Roman, Times, Serif">66 </span><span style="font: 10pt Times New Roman, Times, Serif">months.
In late 2015, Lenox Drive Office Park LLC purchased the real estate and office building and assumed the Lease. This Lease was set to
expire on <span id="xdx_903_eus-gaap--LeaseExpirationDate1_dd_c20110701__20110731_zMDe2EcMKkyc">April 30, 2017</span></span><span style="font: 10pt Times New Roman, Times, Serif">.
In April 2017, the Company and the landlord amended the Lease effective May 1, 2017. The 1<sup>st</sup> Lease Amendment extended the
term of the agreement for an additional 64 months, reduced the premises to 7,565 square feet, reduced the monthly rent and provided
four months free rent. The monthly rent ranged from approximately $<span id="xdx_90D_eus-gaap--PaymentsForRent_c20210101__20210630__us-gaap--TypeOfArrangementAxis__custom--FirstLeaseAmendmentMember__us-gaap--AwardTypeAxis__custom--FirstYearMember_pp0p0">18,900 </span></span><span style="font: 10pt Times New Roman, Times, Serif">in
the first year to approximately $<span id="xdx_901_eus-gaap--PaymentsForRent_c20210101__20210630__us-gaap--TypeOfArrangementAxis__custom--FirstLeaseAmendmentMember__us-gaap--AwardTypeAxis__custom--FinalYearMember_pp0p0">20,500 </span></span><span style="font: 10pt Times New Roman, Times, Serif">in
the final year of the 1<sup>st</sup> Lease Amendment. Effective January 9, 2019, the Company amended the current terms of the
1<sup>st</sup> Lease Amendment to increase the size of the premises by 2,285 square feet to 9,850 square feet and also extended the
lease term by one year to September 1, 2023. The monthly rent ranges from approximately $<span id="xdx_90C_eus-gaap--PaymentsForRent_c20210101__20210630__us-gaap--TypeOfArrangementAxis__custom--SecondLeaseAmendmentMember__us-gaap--AwardTypeAxis__custom--FirstYearMember_pp0p0">25,035 </span></span><span style="font: 10pt Times New Roman, Times, Serif">in
the first year to approximately $<span id="xdx_908_eus-gaap--PaymentsForRent_c20210101__20210630__us-gaap--TypeOfArrangementAxis__custom--SecondLeaseAmendmentMember__us-gaap--AwardTypeAxis__custom--FinalYearMember_pp0p0">27,088 </span></span><span style="font: 10pt Times New Roman, Times, Serif">in
the final year of the 2<sup>nd</sup> Lease Amendment.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span id="xdx_907_eus-gaap--LesseeOperatingLeaseDescription_c20180101__20180131__us-gaap--TypeOfArrangementAxis__custom--EGENAssetPurchaseAgreementMember" style="font: 10pt Times New Roman, Times, Serif">In
connection with the EGEN Asset Purchase Agreement in June 2014, the Company assumed the existing lease with another landlord for an </span><span style="font: 10pt Times New Roman, Times, Serif"><span id="xdx_904_eus-gaap--AreaOfLand_iI_uSqft_c20201231__srt--StatementGeographicalAxis__custom--HuntsvilleAlabamaMember_z9VwuUYmSqsc">11,500</span>
square foot premises located in Huntsville Alabama. In January 2018, the Company and the Huntsville landlord entered into a new
60-month lease which reduced the premises to 9,049 square feet with rent payments of approximately $</span><span id="xdx_90F_eus-gaap--PaymentsForRent_c20180101__20180131__us-gaap--TypeOfArrangementAxis__custom--EGENAssetPurchaseAgreementMember_pp0p0" style="font: 10pt Times New Roman, Times, Serif">18,100
per month.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">We
adopted ASC Topic 842 on January 1, 2019 using the modified retrospective transition method for all lease arrangements at the beginning
of the period of adoption. Results for reporting periods beginning January 1, 2019 are presented under ASC 842, while prior period amounts
were not adjusted and continue to be reported in accordance with our historic accounting under Topic 840, Leases. The standard had a
material impact on our Condensed Consolidated Balance Sheet but had no impact on our condensed consolidated net earnings and cash flows.
The most significant impact of adopting ASC Topic 842 was the recognition of the right-of-use (ROU) asset and lease liabilities for operating
leases, which are presented in the following three-line items on the Consolidated Condensed Balance Sheet: (i) operating lease right-of-use
asset; (ii) current operating lease liabilities; and (iii) operating lease liabilities. Therefore, on date of adoption of ASC Topic 842,
the Company recognized a ROU asset of $<span id="xdx_90C_eus-gaap--OperatingLeaseRightOfUseAsset_iI_pn5n6_c20190102__us-gaap--AdjustmentsForNewAccountingPronouncementsAxis__us-gaap--AccountingStandardsUpdate201602Member_zEM04KJrnLI6">1.4
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million, operating lease liabilities, current
and non-current collectively, of $<span id="xdx_90A_eus-gaap--OperatingLeaseLiability_iI_pn5n6_c20190102__us-gaap--AdjustmentsForNewAccountingPronouncementsAxis__us-gaap--AccountingStandardsUpdate201602Member_zZKWm4rGCLUd">1.5
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million and reduced other liabilities by approximately
$<span id="xdx_909_eus-gaap--OtherLiabilities_iI_pn5n6_c20190102__us-gaap--AdjustmentsForNewAccountingPronouncementsAxis__us-gaap--AccountingStandardsUpdate201602Member_zNFw1wNi5JNa">0.1
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million. We elected the package of practical
expedients for leases that commenced before the effective date of ASC Topic 842 whereby we elected to not reassess the following: (i)
whether any expired or existing contracts contain leases; (ii) the lease classification for any expired or existing leases; and (iii)
initial direct costs for any existing leases. In addition, we have lease agreements with lease and non-lease components, and we have
elected the practical expedient for all underlying asset classes and account for them as a single lease component. We have no finance
leases. We determine if an arrangement is a lease at inception. We have operating leases for office space and research and development
facilities. Neither of our leases include options to renew, however, one contains an option for early termination. We considered the
option of early termination in measurement of right-of-use assets and lease liabilities and we determined it is not reasonably certain
to be terminated. In connection with the 2<sup>nd</sup> Lease Amendment for the New Jersey office lease in January 2019, the Company
considered this as one modified lease and not as two separate leases. Therefore, in January 2019, the Company determined this lease was
an operating lease and remeasured the ROU asset and lease liability. Therefore, the Company increased the ROU asset and operating lease
liabilities by $<span id="xdx_903_eus-gaap--OperatingLeaseRightOfUseAsset_iI_pn5n6_c20190102_zlH6INxpkBfh">0.4</span></span> <span style="font: 10pt Times New Roman, Times, Serif">million
to $<span id="xdx_90D_eus-gaap--RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability_pn5n6_c20181230__20190102_z7H2dtHkWFhg">1.8
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million and $<span id="xdx_904_eus-gaap--OperatingLeaseLiability_iI_pn5n6_c20190102_zi4Bxybj99Fe">1.9
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million, respectively.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>




<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p id="xdx_890_eus-gaap--LesseeOperatingLeaseLiabilityMaturityTableTextBlock_z4RySOfHK1V8" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Following
is a table of the lease payments and maturity of our operating lease liabilities as of June 30, 2021:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;<span id="xdx_8B7_zyKGaaw0an66" style="display: none">Schedule
of Lease Payments and Maturity of Operating Lease Liabilities</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="vertical-align: bottom">
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" id="xdx_495_20210630_zE9yRm7JS5b1" style="border-bottom: Black 1.5pt solid; text-align: center"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>For
                                            the</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>year
                                            ending<br/> June 30,</b></span></p></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_40C_eus-gaap--LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_iI_pp0p0_maLOLLPzRpH_zbZY95qxpQc5" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left; width: 80%"><span style="font-family: Times New Roman, Times, Serif">Remainder of 2021</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td style="width: 16%; text-align: right"><span style="font-family: Times New Roman, Times, Serif">266,188</span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_402_eus-gaap--LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_iI_pp0p0_maLOLLPzRpH_z06zh07qOhj9" style="vertical-align: bottom; background-color: White">
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">2022</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">535,579</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_40B_eus-gaap--LesseeOperatingLeaseLiabilityPaymentsDueYearThree_iI_pp0p0_maLOLLPzRpH_zV55xrWo0Y9h" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">2023</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">233,116</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_409_ecustom--LesseeOperatingLeaseLiabilityPaymentsDueAfterYearThreeAndThereAfter_iI_pp0p0_maLOLLPzRpH_z8CQV3Hxu8o7" style="vertical-align: bottom; background-color: White">
    <td style="text-align: left; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">2024 and thereafter</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl1316">&#160;</span></span></td><td style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif">-</span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_40F_eus-gaap--LesseeOperatingLeaseLiabilityPaymentsDue_iTI_pp0p0_mtLOLLPzRpH_zxkN4KFxThYc" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">Subtotal future lease payments</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">1,034,883</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_409_ecustom--OperatingLeaseImputedInterest_iNI_pp0p0_di_zxa1wWigBvZ1" style="vertical-align: bottom; background-color: White">
    <td style="padding-left: 10pt; text-align: left; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">Less
    imputed interest</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif">(101,664</span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">)</span></td></tr>
  <tr id="xdx_404_eus-gaap--OperatingLeaseLiability_iI_pp0p0_zI5OOCubORAk" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">Total lease liabilities</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif">933,219</span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">Weighted average remaining
    life</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 1.5pt solid; text-align: right"><span id="xdx_905_eus-gaap--OperatingLeaseWeightedAverageRemainingLeaseTerm1_iI_dtY_c20210630_zDfXmVicMJyg" style="font: 10pt Times New Roman, Times, Serif">2.0
                                            </span><span style="font: 10pt Times New Roman, Times, Serif">years</span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left; padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">Weighted average discount
    rate</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 2.5pt double; text-align: right"><span id="xdx_90F_eus-gaap--OperatingLeaseWeightedAverageDiscountRatePercent_iI_pid_dp_c20210630_zcTGE2yTgdg2" style="font-family: Times New Roman, Times, Serif">9.98</span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">%</span></td></tr>
  </table>

<p id="xdx_8A1_zAGTiCFuhki3" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">For
the three-month and six-month periods ended June 30, 2021, operating lease expense was $<span id="xdx_907_eus-gaap--OperatingLeaseCost_pp0p0_c20210401__20210630__us-gaap--TypeOfArrangementAxis__custom--OperatingLeasesMember_zGSiDGXz7GB4">130,595
</span></span><span style="font: 10pt Times New Roman, Times, Serif">and $<span id="xdx_90A_eus-gaap--OperatingLeaseCost_pp0p0_c20210101__20210630__us-gaap--TypeOfArrangementAxis__custom--OperatingLeasesMember_zluoCzg0oAki">261,190</span></span><span style="font: 10pt Times New Roman, Times, Serif">,
respectively and cash paid for operating leases included in operating cash flows was $<span id="xdx_90B_eus-gaap--OperatingLeasePayments_pp0p0_c20210401__20210630__us-gaap--TypeOfArrangementAxis__custom--OperatingLeasesMember_zO3k0KyjPhJ4">132,684
</span></span><span style="font: 10pt Times New Roman, Times, Serif">and $<span id="xdx_90D_eus-gaap--OperatingLeasePayments_pp0p0_c20210101__20210630__us-gaap--TypeOfArrangementAxis__custom--OperatingLeasesMember_zObdCU54sZtb">264,546</span></span><span style="font: 10pt Times New Roman, Times, Serif">,
respectively. For the three-month and six-month periods ended June 30, 2020, operating lease expense was $<span id="xdx_90A_eus-gaap--OperatingLeaseCost_pp0p0_c20200401__20200630__us-gaap--TypeOfArrangementAxis__custom--OperatingLeasesMember_zG5j5lJcByy8">130,595
</span></span><span style="font: 10pt Times New Roman, Times, Serif">and $<span id="xdx_903_eus-gaap--OperatingLeaseCost_c20200101__20200630__us-gaap--TypeOfArrangementAxis__custom--OperatingLeasesMember_pp0p0">261,190</span></span><span style="font: 10pt Times New Roman, Times, Serif">,
respectively and cash paid for operating leases included in operating cash flows was $<span id="xdx_906_eus-gaap--OperatingLeasePayments_pp0p0_c20200401__20200630__us-gaap--TypeOfArrangementAxis__custom--OperatingLeasesMember_zwDlLDPXz3Ih">131,452
</span></span><span style="font: 10pt Times New Roman, Times, Serif">and $<span id="xdx_90D_eus-gaap--OperatingLeasePayments_c20200101__20200630__us-gaap--TypeOfArrangementAxis__custom--OperatingLeasesMember_pp0p0">262,084</span></span><span style="font: 10pt Times New Roman, Times, Serif">,
respectively.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<span></span>
</td>
</tr>
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<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The entire disclosure for operating leases of lessee. Includes, but is not limited to, description of operating lease and maturity analysis of operating lease liability.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -URI http://asc.fasb.org/subtopic&amp;trid=77888251<br></p></div>
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<tr>
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<span style="display: none;">v3.21.2</span><table class="report" border="0" cellspacing="2" id="idm140561375928904">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Technology Development and Licensing Agreements<br></strong></div></th>
<th class="th" colspan="1">6 Months Ended</th>
</tr>
<tr><th class="th"><div>Jun. 30, 2021</div></th></tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_DisclosureTechnologyDevelopmentAndLicensingAgreementsAbstract', window );"><strong>Technology Development And Licensing Agreements</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_LicensingTransactionTextBlock', window );">Technology Development and Licensing Agreements</a></td>
<td class="text"><p id="xdx_80D_ecustom--LicensingTransactionTextBlock_zO0A5bLZs45e" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><b>Note
17. <span id="xdx_828_zHhke97mWmbc">Technology Development and Licensing Agreements</span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">On
May 7, 2012, the Company entered into a long-term commercial supply agreement with Zhejiang Hisun Pharmaceutical Co. Ltd. (Hisun) for
the production of ThermoDox<sup>&#174;</sup> in the China territory. In accordance with the terms of the agreement, Hisun will be responsible
for providing all of the technical and regulatory support services, including the costs of all technical transfer, registration and bioequivalence
studies, technical transfer costs, Celsion consultative support costs and the purchase of any necessary equipment and additional facility
costs necessary to support capacity requirements for the manufacture of ThermoDox<sup>&#174;</sup>. Celsion will repay Hisun for the aggregate
amount of these development costs and fees commencing on the successful completion of three registration batches of ThermoDox<sup>&#174;</sup>.
Hisun is also obligated to certain performance requirements under the agreement. The agreement will initially be limited to a percentage
of the production requirements of ThermoDox<sup>&#174;</sup> in the China territory with Hisun retaining an option for additional global
supply after local regulatory approval in the China territory. In addition, Hisun will collaborate with Celsion around the regulatory
approval activities for ThermoDox<sup>&#174; </sup>with the China State Food and Drug Administration (CHINA FDA). During the first quarter
of 2015, Hisun completed the successful manufacture of three registration batches of ThermoDox<sup>&#174;</sup>.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">On
January 18, 2013, we entered into a technology development contract with Hisun, pursuant to which Hisun paid us a non-refundable research
and development fee of $<span id="xdx_900_eus-gaap--ProceedsFromLicenseFeesReceived_pn6n6_c20130117__20130118__us-gaap--AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis__custom--HisunMember_zTQp5y8IH3Bg">5
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million to support our development of ThermoDox<sup>&#174;
</sup>in mainland China, Hong Kong and Macau (the China territory). Following our announcement on January 31, 2013 that the HEAT study
failed to meet its primary endpoint, Celsion and Hisun have agreed that the Technology Development Contract entered into on January 18,
2013 will remain in effect while the parties continue to collaborate and are evaluating the next steps in relation to ThermoDox<sup>&#174;</sup>,
which include the sub-group analysis of patients in the Phase III HEAT Study for the hepatocellular carcinoma clinical indication and
other activities to further the development of ThermoDox<sup>&#174; </sup>for the Greater China market. The $<span id="xdx_904_eus-gaap--DeferredRevenue_iI_pn5n6_c20130118__us-gaap--AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis__custom--HisunMember_z8sj8b8g9WSh">5.0
</span></span><span style="font: 10pt Times New Roman, Times, Serif">million received as a non-refundable payment
from Hisun in the first quarter 2013 has been recorded to deferred revenue and will continue to be amortized over the <span id="xdx_90E_ecustom--DeferredRevenueAmortizationPeriod_dtY_c20130117__20130118__us-gaap--AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis__custom--HisunMember_zo2O5Gnooo6f">10
</span></span><span style="font: 10pt Times New Roman, Times, Serif">-year term of the agreement, until such time
as the parties find a mutually acceptable path forward on the development of ThermoDox<sup>&#174;</sup> based on findings of the ongoing
post-study analysis of the HEAT Study data.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">On
July 19, 2013, the Company and Hisun entered into a Memorandum of Understanding to pursue ongoing cooperation for the continued clinical
development of ThermoDox<sup>&#174;</sup> as well as the technology transfer relating to the commercial manufacture of ThermoDox<sup>&#174;
</sup>for the China territory. This expanded level of cooperation includes development of the next generation liposomal formulation with
the goal of creating safer, more efficacious versions of marketed cancer chemotherapeutics.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Among
the key provisions of the Celsion-Hisun Memorandum of Understanding are:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; width: 0.5in; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><b>&#9679;</b></span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Hisun
    will provide the Company with internal resources necessary to complete the technology transfer of the Company&#8217;s proprietary
    manufacturing process and the production of registration batches for the China territory;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><b>&#9679;</b></span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Hisun
    will coordinate with the Company around the clinical and regulatory approval activities for ThermoDox<sup>&#174;</sup> as well as
    other liposomal formations with the CHINA FDA; and</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><b>&#9679;</b></span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Hisun
    will be granted a right of <i>first</i> offer for a commercial license to ThermoDox<sup>&#174;</sup> for the sale and distribution
    of ThermoDox<sup>&#174; </sup>in the China territory.</span></td></tr>
  </table>
<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>




<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">On
August 8, 2016, we signed a Technology Transfer, Manufacturing and Commercial Supply Agreement (&#8220;GEN-1 Agreement&#8221;) with Hisun
to pursue an expanded partnership for the technology transfer relating to the clinical and commercial manufacture and supply of GEN-1,
Celsion&#8217;s proprietary gene mediated, IL-12 immunotherapy, for the greater China territory, with the option to expand into other
countries in the rest of the world after all necessary regulatory approvals are in effect. The GEN-1 Agreement will help to support supply
for both ongoing and planned clinical studies in the U.S., and for potential future studies of GEN-1 in China. GEN-1 is currently being
evaluated by Celsion in first line ovarian cancer patients.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Key
provisions of the GEN-1 Agreement are as follows:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 9.9pt"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
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    <td style="font: 10pt Times New Roman, Times, Serif; width: 0.5in"><span style="font: 10pt Times New Roman, Times, Serif"><b>&#9679;</b></span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">the
    GEN-1 Agreement has targeted unit costs for clinical supplies of GEN-1 that are substantially competitive with the Company&#8217;s
    current suppliers;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif"><b>&#9679;</b></span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">once
    approved, the cost structure for GEN-1 will support rapid market adoption and significant gross margins across global markets;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif"><b>&#9679;</b></span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Celsion
    will provide Hisun a certain percentage of China&#8217;s commercial unit demand, and separately of global commercial unit demand,
    subject to regulatory approval;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif"><b>&#9679;</b></span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Hisun
    and Celsion will commence technology transfer activities relating to the manufacture of GEN-1, including all studies required by
    CHINA FDA for site approval; and</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif"><b>&#9679;</b></span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Hisun
    will collaborate with Celsion around the regulatory approval activities for GEN-1 with the CHINA FDA. A local China partner affords
    Celsion access to accelerated CHINA FDA review and potential regulatory exclusivity for the approved indication.</span></td></tr>
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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">The
Company evaluated the Hisun arrangement in accordance with ASC 606 and determined that its performance obligations under the agreement
include the non-exclusive, royalty-free license, research and development services to be provided by the Company, and its obligation
to serve on a joint committee. The Company concluded that the license was not distinct since its value is closely tied to the ongoing
research and development activities. As such, the license and the research and development services are bundled as a single performance
obligation. Since the provision of the license and research and development services are considered a single performance obligation,
the $<span id="xdx_900_ecustom--UpfrontPaymentBeingRecognized_c20210101__20210630_pp0p0">5,000,000</span></span> <span style="font: 10pt Times New Roman, Times, Serif">upfront
payment is being recognized as revenue ratably through 2022.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<span></span>
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<span style="display: none;">v3.21.2</span><table class="report" border="0" cellspacing="2" id="idm140561287674056">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Commitments and Contingencies<br></strong></div></th>
<th class="th" colspan="1">6 Months Ended</th>
</tr>
<tr><th class="th"><div>Jun. 30, 2021</div></th></tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CommitmentsAndContingenciesDisclosureAbstract', window );"><strong>Commitments and Contingencies Disclosure [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CommitmentsAndContingenciesDisclosureTextBlock', window );">Commitments and Contingencies</a></td>
<td class="text"><p id="xdx_80A_eus-gaap--CommitmentsAndContingenciesDisclosureTextBlock_zq4ODTqpkxA7" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif"><b>Note
18. <span id="xdx_828_zf71VXYqeqia">Commitments and Contingencies</span></b></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">On
September 20, 2019, a purported stockholder of the Company filed a derivative and putative class action lawsuit against the Company and
certain officers and directors (the &#8220;Shareholder Action&#8221;). The Company was a defendant in this derivative and putative class
action lawsuit in the Superior Court of New Jersey, Chancery Division, filed by a shareholder against the Company (as both a class action
defendant and nominal defendant), and certain of its officers and directors (the &#8220;Individual Defendants&#8221;), with the caption
<i>O&#8217;Connor v. Braun et al., Docket No. MER-C-000068-19</i> (the &#8220;Shareholder Action&#8221;). The Shareholder Action alleged
breaches of the defendants&#8217; fiduciary duties based on allegations that the defendants omitted or made improper statements when
seeking shareholder approval of the 2018 Stock Incentive Plan. The Shareholder Action sought, among other things, any damages sustained
by the Company as a result of the defendants&#8217; alleged wrongdoing, a declaratory judgment against all defendants invalidating the
2018 Stock Incentive Plan and declaring any awards made under the Plan invalid, rescinded, and subject to disgorgement, an order disgorging
the equity awards granted to the Individual Defendants under the 2018 Stock Incentive Plan, and attorneys&#8217; fees and costs.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">On
April 24, 2020, the Company, the Individual Defendants, and the plaintiff (the &#8220;Parties&#8221;) entered into a Settlement Agreement
and Release (the &#8220;Settlement Agreement&#8221;), which memorializes the terms of the Parties&#8217; settlement of the Shareholder
Action (the &#8220;Settlement&#8221;). The Settlement calls for repricing of certain stock options and payment of plaintiff legal fees
of $<span id="xdx_90B_eus-gaap--LitigationSettlementExpense_c20200422__20200424_pp0p0">187,500</span></span><span style="font: 10pt Times New Roman, Times, Serif">.
On July 24, 2020, the Court issued an order approving the Parties&#8217; proposed form of notice to shareholders regarding the Settlement.
A hearing was held on September 8, 2020 whereby the Court issued a final approval approving the Settlement. Pursuant to the Settlement,
the Company paid $<span id="xdx_90E_eus-gaap--PaymentsForLegalSettlements_c20201001__20201002_pp0p0">187,500</span></span> <span style="font: 10pt Times New Roman, Times, Serif">on
October 1, 2020. Without admitting the validity of any of the claims asserted in the Shareholder Action, or any liability with respect
thereto, and expressly denying all allegations of wrongdoing, fault, liability, or damage against the Company and the Individual Defendants
arising out of any of the conduct, statements, acts or omissions alleged, or that could have been alleged, in the Shareholder Action,
the Company and the Individual Defendants concluded that it was desirable that the claims be settled on the terms and subject to the
conditions set forth in the Settlement Agreement. The Company and the Individual Defendants entered into the Settlement Agreement for
settlement purposes only and solely to avoid the cost and disruption of further litigation.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">On
October 29, 2020, a putative securities class action was filed against the Company and certain of its officers and directors (the &#8220;Spar
Individual Defendants&#8221;) in the U.S. District Court for the District of New Jersey, captioned <i>Spar v. Celsion Corporation, et
al.</i>, Case No. 1:20-cv-15228. The plaintiff alleges that the Company and Individual Defendants made false and misleading statements
regarding one of the Company&#8217;s product candidates, ThermoDox<sup>&#174;</sup>, and brings claims for damages under Section 10(b)
of the Exchange Act and Rule 10b-5 promulgated thereunder against all Defendants, and under Section 20(a) of the Exchange Act of 1934
against the Spar Individual Defendants. The Company believes that the case is without merit and intends to defend it vigorously. Due
to the early stage of the case neither the likelihood that a loss, if any, will be realized, nor an estimate of possible loss or range
of loss, if any, can be determined.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">In
February 2021, a derivative shareholder lawsuit was filed against the Company, as the nominal defendant, and certain of its directors
and officers as defendants in the U.S. District Court for the District of New Jersey, captioned <i>Fidler v. Michael H. Tardugno et al.</i>,
Case No. 3:21-cv-02662. The plaintiff alleges breach of fiduciary duty and other claims arising out of alleged statements made by certain
of the Company&#8217;s directors and/or officers regarding ThermoDox<sup>&#174;.</sup> The Company believes it has meritorious defenses
to these claims and intends to vigorously contest this suit. Due to the early stage of the case neither the likelihood that a loss, if
any, will be realized, nor an estimate of possible loss or range of loss, if any, can be determined.</span></p>

<span></span>
</td>
</tr>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The entire disclosure for commitments and contingencies.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 450<br> -URI http://asc.fasb.org/topic&amp;trid=2127136<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 440<br> -URI http://asc.fasb.org/topic&amp;trid=2144648<br><br>Reference 3: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 954<br> -SubTopic 440<br> -Section 50<br> -Paragraph 1<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=6491277&amp;loc=d3e6429-115629<br><br>Reference 4: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 440<br> -SubTopic 10<br> -Section 50<br> -Paragraph 4<br> -Subparagraph (c)<br> -URI http://asc.fasb.org/extlink&amp;oid=123406679&amp;loc=d3e25336-109308<br><br>Reference 5: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 440<br> -SubTopic 10<br> -Section 50<br> -Paragraph 4<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=123406679&amp;loc=d3e25336-109308<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
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<span style="display: none;">v3.21.2</span><table class="report" border="0" cellspacing="2" id="idm140561281324568">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Restricted Cash (Tables)<br></strong></div></th>
<th class="th" colspan="1">6 Months Ended</th>
</tr>
<tr><th class="th"><div>Jun. 30, 2021</div></th></tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ReceivablesAbstract', window );"><strong>Receivables [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ScheduleOfRestrictedCashAndCashEquivalentsTextBlock', window );">Schedule of Cash and Cash Equivalents and Restricted Cash</a></td>
<td class="text"><p id="xdx_898_eus-gaap--ScheduleOfRestrictedCashAndCashEquivalentsTextBlock_z8WfHHRzm9Ci" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">The
following table reconciles cash and cash equivalents and restricted cash per the balance sheet to the condensed statement of cash flows:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; display: none; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;<span id="xdx_8B9_zu6BBBVVxRYh">Schedule
of Cash and Cash Equivalents and Restricted Cash</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="vertical-align: bottom">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" id="xdx_499_20210630_zGNQaOpaYT13" style="font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">June
    30,</span></td><td style="font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" id="xdx_493_20200630_zxHHC3hlb117" style="font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">June
    30,</span></td><td style="font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">2021</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">2020</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_405_eus-gaap--CashAndCashEquivalentsAtCarryingValue_iI_pp0p0_maCCERCz29N_ztdehdP1Lfm9" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="width: 60%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">Cash and cash equivalents</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td style="width: 16%; text-align: right"><span style="font-family: Times New Roman, Times, Serif">26,437,424</span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td style="width: 16%; text-align: right"><span style="font-family: Times New Roman, Times, Serif">22,653,760</span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_403_eus-gaap--RestrictedInvestments_iI_pp0p0_maCCERCz29N_zVPUqCGAxf5c" style="vertical-align: bottom; background-color: White">
    <td style="text-align: left; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">Money market investments,
    restricted</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif">6,000,000</span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0773">&#160;</span></span></td><td style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif">-</span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_404_eus-gaap--CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_iTI_pp0p0_mtCCERCz29N_zHaEkfeLA1P2" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="padding-left: 10pt; padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">Total</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td style="border-bottom: Black 2.5pt double; text-align: right"><span style="font-family: Times New Roman, Times, Serif">32,437,424</span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td style="border-bottom: Black 2.5pt double; text-align: right"><span style="font-family: Times New Roman, Times, Serif">22,653,760</span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Tabular disclosure of cash and cash equivalents restricted as to withdrawal or usage.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 942<br> -SubTopic 210<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.9-03(1)(a))<br> -URI http://asc.fasb.org/extlink&amp;oid=120398452&amp;loc=d3e534808-122878<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 50<br> -Paragraph 8<br> -URI http://asc.fasb.org/extlink&amp;oid=123431023&amp;loc=SL98516268-108586<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 944<br> -SubTopic 210<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.7-03(a)(2))<br> -URI http://asc.fasb.org/extlink&amp;oid=120400017&amp;loc=d3e572229-122910<br><br>Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(1))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
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<td style="white-space:nowrap;">us-gaap_ScheduleOfRestrictedCashAndCashEquivalentsTextBlock</td>
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<span style="display: none;">v3.21.2</span><table class="report" border="0" cellspacing="2" id="idm140561287685688">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Investment in Debt Securities Available for Sale (Tables)<br></strong></div></th>
<th class="th" colspan="1">6 Months Ended</th>
</tr>
<tr><th class="th"><div>Jun. 30, 2021</div></th></tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract', window );"><strong>Investments, Debt and Equity Securities [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AvailableForSaleSecuritiesTextBlock', window );">Schedule of Cost, Fair Value and Maturities of Short Term Investments</a></td>
<td class="text"><p id="xdx_89A_eus-gaap--AvailableForSaleSecuritiesTextBlock_zRaide2ifxYk" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">A
summary of the cost, fair value and maturities of the Company&#8217;s short-term investments is as follows:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; display: none; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif">&#160;<span id="xdx_8BC_z87fG4UsVTe9">Schedule
of Cost, Fair Value and Maturities of Short Term Investments</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="vertical-align: bottom">
    <td style="font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="6" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">June
    30, 2021</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="6" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">December
    31, 2020</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom">
    <td style="font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">Cost</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">Fair
    Value</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">Short-term investments</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
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    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_98A_eus-gaap--ShortTermInvestments_c20210630__us-gaap--FinancialInstrumentAxis__us-gaap--CommercialPaperMember_pp0p0" style="width: 11%; text-align: right" title="Short-term investments - Cost"><span style="font-family: Times New Roman, Times, Serif">7,795,035</span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_98E_eus-gaap--AvailableForSaleSecuritiesDebtSecuritiesCurrent_c20210630__us-gaap--FinancialInstrumentAxis__us-gaap--CommercialPaperMember_pp0p0" style="width: 11%; text-align: right" title="Short-term investments - Fair Value"><span style="font-family: Times New Roman, Times, Serif">7,792,785</span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_980_eus-gaap--ShortTermInvestments_c20201231__us-gaap--FinancialInstrumentAxis__us-gaap--CommercialPaperMember_pp0p0" style="width: 11%; text-align: right" title="Short-term investments - Cost"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0793">-</span></span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_98D_eus-gaap--AvailableForSaleSecuritiesDebtSecuritiesCurrent_c20201231__us-gaap--FinancialInstrumentAxis__us-gaap--CommercialPaperMember_pp0p0" style="width: 11%; text-align: right" title="Short-term investments - Fair Value"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0795">-</span></span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">Government backed debt
    securities</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_985_eus-gaap--ShortTermInvestments_c20210630__us-gaap--FinancialInstrumentAxis__custom--GovernmentBackedDebtSecuritiesMember_pp0p0" style="border-bottom: Black 1.5pt solid; text-align: right" title="Short-term investments - Cost"><span style="font-family: Times New Roman, Times, Serif">24,132,020</span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_98A_eus-gaap--AvailableForSaleSecuritiesDebtSecuritiesCurrent_c20210630__us-gaap--FinancialInstrumentAxis__custom--GovernmentBackedDebtSecuritiesMember_pp0p0" style="border-bottom: Black 1.5pt solid; text-align: right" title="Short-term investments - Fair Value"><span style="font-family: Times New Roman, Times, Serif">24,130,500</span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span>-</td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 1.5pt solid; text-align: right">-</td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td style="font-weight: bold; padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">Total</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_986_eus-gaap--ShortTermInvestments_c20210630_pp0p0" style="border-bottom: Black 2.5pt double; text-align: right" title="Short-term investments - Cost"><span style="font-family: Times New Roman, Times, Serif">31,927,055</span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_989_eus-gaap--AvailableForSaleSecuritiesDebtSecuritiesCurrent_c20210630_pp0p0" style="border-bottom: Black 2.5pt double; text-align: right" title="Short-term investments - Fair Value"><span style="font-family: Times New Roman, Times, Serif">31,923,285</span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_981_eus-gaap--ShortTermInvestments_c20201231_pp0p0" style="border-bottom: Black 2.5pt double; text-align: right" title="Short-term investments - Cost"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0805">-</span></span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_98C_eus-gaap--AvailableForSaleSecuritiesDebtSecuritiesCurrent_c20201231_pp0p0" style="border-bottom: Black 2.5pt double; text-align: right" title="Short-term investments - Fair Value"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0807">-</span></span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  </table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="vertical-align: bottom">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="6" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">June
    30, 2021</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="6" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">December
    31, 2020</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom">
    <td style="font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">Cost</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">Fair
    Value</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">Cost</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">Fair
    Value</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">Short-term investment maturities</span></td><td style="font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td style="width: 40%"><span style="font-family: Times New Roman, Times, Serif">Within 3 months</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_985_ecustom--DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingWithinThreeMonthsAmortizedCost_c20210630_pp0p0" style="width: 11%; text-align: right" title="Short-term investment maturities - Within 3 months, cost"><span style="font-family: Times New Roman, Times, Serif">2,999,420</span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_989_ecustom--DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingWithinThreeMonthsFairValue_c20210630_pp0p0" style="width: 11%; text-align: right" title="Short-term investment maturities - Within 3 months, fair value"><span style="font-family: Times New Roman, Times, Serif">7,792,785</span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_986_ecustom--DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingWithinThreeMonthsAmortizedCost_c20201231_pp0p0" style="width: 11%; text-align: right" title="Short-term investment maturities - Within 3 months, cost"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0813">-</span></span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_984_ecustom--DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingWithinThreeMonthsFairValue_c20201231_pp0p0" style="width: 11%; text-align: right" title="Short-term investment maturities - Within 3 months, fair value"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0815">-</span></span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">Between 3-12 months</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_981_ecustom--DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingBetweenThreeAndTwelveMonthsAmortizedCost_c20210630_pp0p0" style="border-bottom: Black 1.5pt solid; text-align: right" title="Short-term investment maturities - Between 3-12 months, cost"><span style="font-family: Times New Roman, Times, Serif">28,927,635</span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_98E_ecustom--DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingBetweenThreeAndTwelveMonthsFairValue_c20210630_pp0p0" style="border-bottom: Black 1.5pt solid; text-align: right" title="Short-term investment maturities - Between 3-12 months, fair value"><span style="font-family: Times New Roman, Times, Serif">24,130,500</span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_984_ecustom--DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingBetweenThreeAndTwelveMonthsAmortizedCost_c20201231_pp0p0" style="border-bottom: Black 1.5pt solid; text-align: right" title="Short-term investment maturities - Between 3-12 months, cost"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0821">-</span></span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_98D_ecustom--DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingBetweenThreeAndTwelveMonthsFairValue_c20201231_pp0p0" style="border-bottom: Black 1.5pt solid; text-align: right" title="Short-term investment maturities - Between 3-12 months, fair value"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0823">-</span></span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td style="font-weight: bold; padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">Total</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_98B_ecustom--AvailableForSaleDebtSecuritiesAmortizedCostBasisCurrent_c20210630_pp0p0" style="border-bottom: Black 2.5pt double; text-align: right" title="Total, cost"><span style="font-family: Times New Roman, Times, Serif">31,927,055</span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_983_eus-gaap--AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate_c20210630_pp0p0" style="border-bottom: Black 2.5pt double; text-align: right" title="Total, fair value"><span style="font-family: Times New Roman, Times, Serif">31,923,285</span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_988_ecustom--AvailableForSaleDebtSecuritiesAmortizedCostBasisCurrent_c20201231_pp0p0" style="border-bottom: Black 2.5pt double; text-align: right" title="Total, cost"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0829">-</span></span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_980_eus-gaap--AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate_c20201231_pp0p0" style="border-bottom: Black 2.5pt double; text-align: right" title="Total, fair value"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0831">-</span></span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  </table>

<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ScheduleOfUnrealizedLossOnInvestmentsTableTextBlock', window );">Summary of Investment Securities Gross Unrealized Gains (Losses)</a></td>
<td class="text"><p id="xdx_899_eus-gaap--ScheduleOfUnrealizedLossOnInvestmentsTableTextBlock_zoRkyQc8eJSh" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">The
following table shows the Company&#8217;s investment in debt securities available for sale gross unrealized gains (losses) and fair value
by investment category and length of time that individual securities have been in a continuous unrealized loss position at June 30, 2021
and December 31, 2020. The Company has reviewed individual securities to determine whether a decline in fair value below the amortizable
cost basis is other than temporary.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; display: none; margin: 0; text-align: justify"><span id="xdx_8BD_zpnMxAxahwPg" style="font: 10pt Times New Roman, Times, Serif">Summary
of Investment Securities Gross Unrealized Gains (Losses)</span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="vertical-align: bottom">
    <td style="font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="6" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">June
    30, 2021</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="6" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">December
    31, 2020</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom">
    <td style="border-bottom: Black 1.5pt solid; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">Available
    for sale securities (all unrealized holding gains and losses are less than 12 months at date of measurement)</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">Fair
    Value</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>Unrealized
                                            Holding</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>Gains
                                            (Losses)</b></span></p></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">Fair
    Value</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>Unrealized
                                            Holding</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>Gains
                                            (Losses)</b></span></p></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="width: 44%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">Investments with unrealized gains</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_987_ecustom--AvailableForSaleSecuritiesUnrealizedGainsFairValue_iI_c20210630_z3kP7aYVfYY7" style="width: 11%; text-align: right" title="Investments with unrealized gains, Fair Value"><span style="font-family: Times New Roman, Times, Serif">5,998,980</span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_989_ecustom--AvailableForSaleSecuritiesUnrealizedHoldingGainsLessThanTwelveMonths_iI_c20210630_z73yY5dYjkJj" style="width: 11%; text-align: right" title="Investments with unrealized gains, Unrealized Holding Gains (Losses)"><span style="font-family: Times New Roman, Times, Serif">1,073</span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_98E_ecustom--AvailableForSaleSecuritiesUnrealizedGainsFairValue_iI_c20201231_zEUHF5fxggM9" style="width: 9%; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0838">-</span></span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_98D_ecustom--AvailableForSaleSecuritiesUnrealizedHoldingGainsLessThanTwelveMonths_iI_c20201231_zJALWk90Uhec" style="width: 9%; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0839">-</span></span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td style="text-align: left; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">Investments with unrealized
    losses</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_98C_ecustom--AvailableForSaleSecuritiesUnrealizedLossFairValue_iI_c20210630_z9UDyW8OCJEh" style="border-bottom: Black 1.5pt solid; text-align: right" title="Investments with unrealized losses, Fair Value"><span style="font-family: Times New Roman, Times, Serif">25,924,305</span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_989_ecustom--AvailableForSaleSecuritiesUnrealizedHoldingLossesLessThanTwelveMonths_iI_c20210630_zlbRJMBli5Vc" style="border-bottom: Black 1.5pt solid; text-align: right" title="Investments with unrealized Losses, Unrealized Holding Gains (Losses)"><span style="font-family: Times New Roman, Times, Serif">(4,843</span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">)</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_980_ecustom--AvailableForSaleSecuritiesUnrealizedLossFairValue_iI_c20201231_zEaBVYTqEBR" style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0844">-</span></span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_98B_ecustom--AvailableForSaleSecuritiesUnrealizedHoldingLossesLessThanTwelveMonths_iI_c20201231_zC9q5gqMTzC2" style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0845">-</span></span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="padding-left: 10pt; font-weight: bold; padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">Total</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_989_eus-gaap--AvailableForSaleSecuritiesDebtSecuritiesCurrent_iI_c20210630_zd1pGBsy9UX3" style="border-bottom: Black 2.5pt double; text-align: right" title="Investment securities, available for sale"><span style="font-family: Times New Roman, Times, Serif">31,923,285</span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_988_ecustom--AvailableForSaleSecuritiesUnrealizedHoldingGainsLossesLessThanTwelveMonths_iI_c20210630_zklx76pw00Xl" style="border-bottom: Black 2.5pt double; text-align: right" title="Investments with unrealized Gains (Losses), Unrealized Holding Gains (Losses)"><span style="font-family: Times New Roman, Times, Serif">(3,770</span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">)</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_98E_eus-gaap--AvailableForSaleSecuritiesDebtSecuritiesCurrent_iI_pp0p0_c20201231_zitrNAaI3459" style="border-bottom: Black 2.5pt double; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0850">-</span></span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_98A_ecustom--AvailableForSaleSecuritiesUnrealizedHoldingGainsLossesLessThanTwelveMonths_iI_c20201231_zMBfZ8IjgWek" style="border-bottom: Black 2.5pt double; text-align: right"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0851">-</span></span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  </table>

<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_InvestmentIncomeTextBlock', window );">Summary of Net Realized Losses on Sales of Available for Sale Securities and Investment Income Interest and Dividends</a></td>
<td class="text"><p id="xdx_89F_eus-gaap--InvestmentIncomeTextBlock_zFQTOKwfKVCf" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Investment
(loss) income, which includes net realized losses on sales of available for sale securities and investment income interest and
dividends, is summarized as follows:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; display: none; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif">&#160;<span id="xdx_8B2_zeRwJVgb5CRk">Summary
of Net Realized Losses on Sales of Available for Sale Securities and Investment Income Interest and Dividends</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="display: none; vertical-align: bottom">
    <td style="text-align: center"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" id="xdx_494_20210401__20210630_zSHyDhyzLjZ6" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">2021</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" id="xdx_493_20200401__20200630_zgTSeZK7Cr9e" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">2020</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
<tr style="vertical-align: bottom">
    <td style="text-align: center"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="6" style="border-bottom: Black 1.5pt solid; text-align: center"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>Three
                                            Months Ended</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>June
                                            30,</b></span></p></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom">
    <td style="text-align: center"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">2021</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">2020</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_403_eus-gaap--InvestmentIncomeInterestAndDividend_maIINzj8E_zfdE28HysZqg" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="width: 60%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">Interest and dividends accrued
    and paid</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td style="width: 16%; text-align: right"><span style="font-family: Times New Roman, Times, Serif">1,436</span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td style="width: 16%; text-align: right"><span style="font-family: Times New Roman, Times, Serif">18,095</span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_409_eus-gaap--AvailableForSaleSecuritiesGrossRealizedGainLossNet_maIINzj8E_zSqSuTUlXRhc" style="vertical-align: bottom; background-color: White">
    <td style="text-align: left; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">Realized (losses) gains</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif">(1,785</span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">)</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif">2,865</span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_403_ecustom--InvestmentIncomeLossNonoperating_iT_pp0p0_mtIINzj8E_zhAI9SQfD4u6" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left; padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">Investment (loss) income,
    net</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td style="border-bottom: Black 2.5pt double; text-align: right"><span style="font-family: Times New Roman, Times, Serif">(349</span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">)</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td style="border-bottom: Black 2.5pt double; text-align: right"><span style="font-family: Times New Roman, Times, Serif">20,960</span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  </table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="display: none; vertical-align: bottom">
    <td style="text-align: center"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" id="xdx_495_20210101__20210630_zueeupzM32bg" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">2021</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" id="xdx_494_20200101__20200630_zlvHlUejVj51" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">2020</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
<tr style="vertical-align: bottom">
    <td style="text-align: center"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="6" style="border-bottom: Black 1.5pt solid; text-align: center"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>Six
                                            Months Ended</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>June
                                            30,</b></span></p></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom">
    <td style="text-align: center"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">2021</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">2020</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_400_eus-gaap--InvestmentIncomeInterestAndDividend_maIINz3xg_z2bCtAatVzL4" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="width: 60%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">Interest and dividends accrued
    and paid</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td style="width: 16%; text-align: right"><span style="font-family: Times New Roman, Times, Serif">3,847</span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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<span style="display: none;">v3.21.2</span><table class="report" border="0" cellspacing="2" id="idm140561282697176">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Fair Value Measurements (Tables)<br></strong></div></th>
<th class="th" colspan="1">6 Months Ended</th>
</tr>
<tr><th class="th"><div>Jun. 30, 2021</div></th></tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_DisclosureFairValueMeasurementsAbstract', window );"><strong>Fair Value Measurements</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock', window );">Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis</a></td>
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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;<span id="xdx_8B9_zn5uah0SSVHd" style="display: none">Schedule
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<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
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    <td><span style="font-family: Times New Roman, Times, Serif">Assets:</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td><span style="font-family: Times New Roman, Times, Serif">Non-recurring items as of June 30, 2021</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="padding-left: 10pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">In-process R&amp;D (Note
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    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_981_eus-gaap--AvailableForSaleSecuritiesDebtSecuritiesCurrent_c20210630__us-gaap--FairValueByMeasurementFrequencyAxis__us-gaap--FairValueMeasurementsNonrecurringMember__us-gaap--FairValueByFairValueHierarchyLevelAxis__us-gaap--FairValueInputsLevel2Member__us-gaap--FinancialInstrumentAxis__custom--InprocessRandDMember_pp0p0" style="text-align: right" title="Investment securities, available for sale"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0892">&#8211;</span></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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  <tr style="vertical-align: bottom; background-color: White">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td><span style="font-family: Times New Roman, Times, Serif">Non-recurring items as of December 31, 2020</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td style="padding-left: 10pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">In-process R&amp;D (Note
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    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_98C_eus-gaap--AvailableForSaleSecuritiesDebtSecuritiesCurrent_c20201231__us-gaap--FairValueByMeasurementFrequencyAxis__us-gaap--FairValueMeasurementsNonrecurringMember__us-gaap--FairValueByFairValueHierarchyLevelAxis__us-gaap--FairValueInputsLevel1Member__us-gaap--FinancialInstrumentAxis__custom--InprocessRandDMember_pp0p0" style="text-align: right" title="Investment securities, available for sale"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0898">&#8211;</span></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_982_eus-gaap--AvailableForSaleSecuritiesDebtSecuritiesCurrent_c20201231__us-gaap--FairValueByMeasurementFrequencyAxis__us-gaap--FairValueMeasurementsNonrecurringMember__us-gaap--FairValueByFairValueHierarchyLevelAxis__us-gaap--FairValueInputsLevel2Member__us-gaap--FinancialInstrumentAxis__custom--InprocessRandDMember_pp0p0" style="text-align: right" title="Investment securities, available for sale"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0900">&#8211;</span></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_983_eus-gaap--AvailableForSaleSecuritiesDebtSecuritiesCurrent_c20201231__us-gaap--FairValueByMeasurementFrequencyAxis__us-gaap--FairValueMeasurementsNonrecurringMember__us-gaap--FairValueByFairValueHierarchyLevelAxis__us-gaap--FairValueInputsLevel3Member__us-gaap--FinancialInstrumentAxis__custom--InprocessRandDMember_pp0p0" style="text-align: right" title="Investment securities, available for sale"><span style="font-family: Times New Roman, Times, Serif">13,366,234</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td><span style="font-family: Times New Roman, Times, Serif">Liabilities:</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td><span style="font-family: Times New Roman, Times, Serif">Recurring items as of June 30, 2021</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="padding-left: 10pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">Earn-out milestone liability
    (Note 14)</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_982_eus-gaap--BusinessCombinationContingentConsiderationLiabilityNoncurrent_c20210630__us-gaap--FairValueByMeasurementFrequencyAxis__us-gaap--FairValueMeasurementsRecurringMember_pp0p0" style="text-align: right" title="Earn-out milestone liability"><span style="font-family: Times New Roman, Times, Serif">7,088,000</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_983_eus-gaap--BusinessCombinationContingentConsiderationLiabilityNoncurrent_c20210630__us-gaap--FairValueByMeasurementFrequencyAxis__us-gaap--FairValueMeasurementsRecurringMember__us-gaap--FairValueByFairValueHierarchyLevelAxis__us-gaap--FairValueInputsLevel1Member_pp0p0" style="text-align: right" title="Earn-out milestone liability"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0906">&#8211;</span></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_982_eus-gaap--BusinessCombinationContingentConsiderationLiabilityNoncurrent_c20210630__us-gaap--FairValueByMeasurementFrequencyAxis__us-gaap--FairValueMeasurementsRecurringMember__us-gaap--FairValueByFairValueHierarchyLevelAxis__us-gaap--FairValueInputsLevel2Member_pp0p0" style="text-align: right" title="Earn-out milestone liability"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0908">&#8211;</span></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_981_eus-gaap--BusinessCombinationContingentConsiderationLiabilityNoncurrent_c20210630__us-gaap--FairValueByMeasurementFrequencyAxis__us-gaap--FairValueMeasurementsRecurringMember__us-gaap--FairValueByFairValueHierarchyLevelAxis__us-gaap--FairValueInputsLevel3Member_pp0p0" style="text-align: right" title="Earn-out milestone liability"><span style="font-family: Times New Roman, Times, Serif">7,088,000</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td><span style="font-family: Times New Roman, Times, Serif">Recurring items as of December 31, 2020</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td style="padding-left: 10pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">Earn-out milestone liability
    (Note 14)</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_987_eus-gaap--BusinessCombinationContingentConsiderationLiabilityNoncurrent_c20201231__us-gaap--FairValueByMeasurementFrequencyAxis__us-gaap--FairValueMeasurementsRecurringMember_pp0p0" style="text-align: right" title="Earn-out milestone liability"><span style="font-family: Times New Roman, Times, Serif">7,018,000</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_98F_eus-gaap--BusinessCombinationContingentConsiderationLiabilityNoncurrent_c20201231__us-gaap--FairValueByMeasurementFrequencyAxis__us-gaap--FairValueMeasurementsRecurringMember__us-gaap--FairValueByFairValueHierarchyLevelAxis__us-gaap--FairValueInputsLevel1Member_pp0p0" style="text-align: right" title="Earn-out milestone liability"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0914">&#8211;</span></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_98C_eus-gaap--BusinessCombinationContingentConsiderationLiabilityNoncurrent_c20201231__us-gaap--FairValueByMeasurementFrequencyAxis__us-gaap--FairValueMeasurementsRecurringMember__us-gaap--FairValueByFairValueHierarchyLevelAxis__us-gaap--FairValueInputsLevel2Member_pp0p0" style="text-align: right" title="Earn-out milestone liability"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0916">&#8211;</span></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_98D_eus-gaap--BusinessCombinationContingentConsiderationLiabilityNoncurrent_c20201231__us-gaap--FairValueByMeasurementFrequencyAxis__us-gaap--FairValueMeasurementsRecurringMember__us-gaap--FairValueByFairValueHierarchyLevelAxis__us-gaap--FairValueInputsLevel3Member_pp0p0" style="text-align: right" title="Earn-out milestone liability"><span style="font-family: Times New Roman, Times, Serif">7,018,000</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).</p></div>
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<span style="display: none;">v3.21.2</span><table class="report" border="0" cellspacing="2" id="idm140561392402136">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Intangible Assets (Tables)<br></strong></div></th>
<th class="th" colspan="1">6 Months Ended</th>
</tr>
<tr><th class="th"><div>Jun. 30, 2021</div></th></tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract', window );"><strong>Goodwill and Intangible Assets Disclosure [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_FiniteLivedAndIndefiniteLivedIntangibleAssetsAcquiredAsPartOfBusinessCombinationTableTextBlock', window );">Schedule of Fair Value of Assets Acquired</a></td>
<td class="text"><p id="xdx_894_eus-gaap--FiniteLivedAndIndefiniteLivedIntangibleAssetsAcquiredAsPartOfBusinessCombinationTableTextBlock_zdYgJeGkoxUh" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Following
is a summary of the net fair value of the assets acquired in the EGEN asset acquisition for the six-month period ended June 30,
2021:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;<span id="xdx_8BB_ztRGk8i77Aa6" style="display: none">Schedule
of Fair Value of Assets Acquired</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="vertical-align: bottom">
    <td style="text-align: center"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"><span style="font-family: Times New Roman, Times, Serif">IPR&amp;D</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"><span style="font-family: Times New Roman, Times, Serif">Goodwill</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"><span style="font-family: Times New Roman, Times, Serif">Covenant
    Not To Compete</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">For the six-months ended June 30,
    2021</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td style="width: 46%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">Balance at January 1, 2021, net</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_986_eus-gaap--FiniteLivedIntangibleAssetsNet_iS_pp0p0_c20210101__20210630__us-gaap--FairValueByAssetClassAxis__custom--IPRAndDMember_zjQ3JIkxxDj7" style="width: 14%; text-align: right" title="Intangible assets, beginning balance"><span style="font-family: Times New Roman, Times, Serif">13,366,234</span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_98E_eus-gaap--FiniteLivedIntangibleAssetsNet_iS_pp0p0_c20210101__20210630__us-gaap--FairValueByAssetClassAxis__us-gaap--GoodwillMember_zNBWiGj7paVi" style="width: 14%; text-align: right" title="Intangible assets, beginning balance"><span style="font-family: Times New Roman, Times, Serif">1,976,101</span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_98E_eus-gaap--FiniteLivedIntangibleAssetsNet_iS_pp0p0_c20210101__20210630__us-gaap--FiniteLivedIntangibleAssetsByMajorClassAxis__us-gaap--NoncompeteAgreementsMember_zdqB8nlRBX59" style="width: 14%; text-align: right" title="Intangible assets, beginning balance"><span style="font-family: Times New Roman, Times, Serif">113,660</span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">Amortization</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_986_eus-gaap--AmortizationOfIntangibleAssets_iN_pp0p0_di_c20210101__20210630__us-gaap--FairValueByAssetClassAxis__custom--IPRAndDMember_z7TzeeSXjI5a" style="border-bottom: Black 1.5pt solid; text-align: right" title="Amortization"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0944">-</span></span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_98D_eus-gaap--AmortizationOfIntangibleAssets_iN_pp0p0_di_c20210101__20210630__us-gaap--FairValueByAssetClassAxis__us-gaap--GoodwillMember_zjtx3T7G2Lgi" style="border-bottom: Black 1.5pt solid; text-align: right" title="Amortization"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0946">-</span></span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_982_eus-gaap--AmortizationOfIntangibleAssets_iN_pp0p0_di_c20210101__20210630__us-gaap--FiniteLivedIntangibleAssetsByMajorClassAxis__us-gaap--NoncompeteAgreementsMember_zNQ4n0vGQP99" style="border-bottom: Black 1.5pt solid; text-align: right" title="Amortization"><span style="font-family: Times New Roman, Times, Serif">(113,660</span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">)</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td style="text-align: left; padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">Balance at June 30,
    2021, net</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_98A_eus-gaap--FiniteLivedIntangibleAssetsNet_iE_pp0p0_c20210101__20210630__us-gaap--FairValueByAssetClassAxis__custom--IPRAndDMember_zZEW29lairU1" style="border-bottom: Black 2.5pt double; text-align: right" title="Intangible assets, ending balance"><span style="font-family: Times New Roman, Times, Serif">13,366,234</span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_983_eus-gaap--FiniteLivedIntangibleAssetsNet_iE_pp0p0_c20210101__20210630__us-gaap--FairValueByAssetClassAxis__us-gaap--GoodwillMember_z0nQAbP1KtYl" style="border-bottom: Black 2.5pt double; text-align: right" title="Intangible assets, ending balance"><span style="font-family: Times New Roman, Times, Serif">1,976,101</span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_98F_eus-gaap--FiniteLivedIntangibleAssetsNet_iE_pp0p0_c20210101__20210630__us-gaap--FiniteLivedIntangibleAssetsByMajorClassAxis__us-gaap--NoncompeteAgreementsMember_zr55ihcRj1a4" style="border-bottom: Black 2.5pt double; text-align: right" title="Intangible assets, ending balance"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0954">-</span></span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Tabular disclosure of finite-lived and indefinite-lived intangible assets acquired as part of a business combination.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
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<DOCUMENT>
<TYPE>XML
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<TEXT>
<html>
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<span style="display: none;">v3.21.2</span><table class="report" border="0" cellspacing="2" id="idm140561281324568">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Accrued Liabilities (Tables)<br></strong></div></th>
<th class="th" colspan="1">6 Months Ended</th>
</tr>
<tr><th class="th"><div>Jun. 30, 2021</div></th></tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PayablesAndAccrualsAbstract', window );"><strong>Payables and Accruals [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ScheduleOfAccruedLiabilitiesTableTextBlock', window );">Schedule of Accrued Liabilities</a></td>
<td class="text"><p id="xdx_89D_eus-gaap--ScheduleOfAccruedLiabilitiesTableTextBlock_zOGA1Tqnz419" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Other
accrued liabilities at June 30, 2021 and December 31, 2020 include the following:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font: 10pt Times New Roman, Times, Serif">&#160;<span id="xdx_8BB_zWfJZ5aHNoz4" style="display: none">Schedule
of Accrued Liabilities</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="vertical-align: bottom">
    <td style="text-align: center"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" id="xdx_497_20210630_z2FDEw1SRoAa" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">June
    30, 2021</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" id="xdx_493_20201231_zBnTiuJAFtpg" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">December
    31, 2020</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom">
    <td style="text-align: center"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="text-align: center"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_401_eus-gaap--ContractualObligation_iI_pp0p0_maALCz6Sz_zfyfKVfsRMK4" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="width: 60%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">Amounts due to contract research
    organizations and other contractual agreements</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td style="width: 16%; text-align: right"><span style="font-family: Times New Roman, Times, Serif">1,189,017</span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td style="width: 16%; text-align: right"><span style="font-family: Times New Roman, Times, Serif">636,000</span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_40B_eus-gaap--EmployeeRelatedLiabilitiesCurrent_iI_pp0p0_maALCz6Sz_zDGQRpcFS3Gf" style="vertical-align: bottom; background-color: White">
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">Accrued payroll and related benefits</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">1,016,610</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">1,736,271</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_40F_eus-gaap--AccruedProfessionalFeesCurrent_iI_pp0p0_maALCz6Sz_zPrELNiZ4yrf" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">Accrued professional fees</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">80,625</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">66,850</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
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    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">Accrued interest</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">7,042</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0970">&#160;</span></span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">-</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_40A_eus-gaap--OtherAccruedLiabilitiesCurrent_iI_pp0p0_maALCz6Sz_zpNKibQdMIa3" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">Other</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif">19,411</span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif">19,411</span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_40B_eus-gaap--AccruedLiabilitiesCurrent_iTI_pp0p0_mtALCz6Sz_zGuQO0aCjIf1" style="vertical-align: bottom; background-color: White">
    <td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">Total</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td style="border-bottom: Black 2.5pt double; text-align: right"><span style="font-family: Times New Roman, Times, Serif">2,312,705</span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td style="border-bottom: Black 2.5pt double; text-align: right"><span style="font-family: Times New Roman, Times, Serif">2,458,532</span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Tabular disclosure of the components of accrued liabilities.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
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<DOCUMENT>
<TYPE>XML
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<FILENAME>R31.htm
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<TEXT>
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<span style="display: none;">v3.21.2</span><table class="report" border="0" cellspacing="2" id="idm140561283279032">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Notes (Tables)<br></strong></div></th>
<th class="th" colspan="1">6 Months Ended</th>
</tr>
<tr><th class="th"><div>Jun. 30, 2021</div></th></tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_DebtDisclosureAbstract', window );"><strong>Debt Disclosure [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ScheduleOfMaturitiesOfLongTermDebtTableTextBlock', window );">Schedule of Future Principle Payments, Net of Unamortized Debt Discounts</a></td>
<td class="text"><p id="xdx_89B_eus-gaap--ScheduleOfMaturitiesOfLongTermDebtTableTextBlock_zA0OrhEcHcg5" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Following
is a schedule of future principal payments, net of unamortized debt discounts and amortized end-of-term fee, due on the SVB Loan
Facility:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;<span id="xdx_8B9_z1LBw1ybetAj" style="display: none">Schedule
of Future Principle Payments, Net of Unamortized Debt Discounts</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; margin-left: auto; border-collapse: collapse; width: 80%; margin-right: auto">
  <tr style="vertical-align: bottom">
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="font-weight: bold; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" id="xdx_49B_20210630_zRN0y04DfbZ2" style="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center"><span style="font-family: Times New Roman, Times, Serif">As
    of June 30,</span></td><td style="padding-bottom: 1.5pt; font-weight: bold"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_406_eus-gaap--LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths_iI_pp0p0_maDICAzd4S_zGpQzPb0URLc" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">2022</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl0998">&#8211;</span></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_401_eus-gaap--LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo_iI_pp0p0_maDICAzd4S_z9GgFD7BPiOi" style="vertical-align: bottom; background-color: White">
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">2023</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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  <tr id="xdx_408_eus-gaap--LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree_iI_pp0p0_maDICAzd4S_zpMClawZJ8k4" style="vertical-align: bottom; background-color: rgb(204,238,255)">
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    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="width: 16%; text-align: right"><span style="font-family: Times New Roman, Times, Serif">3,000,000</span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_408_ecustom--LongTermDebtMaturitiesRepaymentsOfPrincipalYearFourAndThereAfter_iI_pp0p0_maDICAzd4S_z7o7oasIwqk7" style="vertical-align: bottom; background-color: White">
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  <tr id="xdx_409_eus-gaap--DebtInstrumentCarryingAmount_iTI_pp0p0_mtDICAzd4S_maLTDzrgw_zqnRyTti7kw9" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">Subtotal of future principal payments</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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  <tr id="xdx_400_eus-gaap--DeferredFinanceCostsNet_iNI_pp0p0_di_msLTDzrgw_zccsqLc8FVH" style="vertical-align: bottom; background-color: White">
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    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif">(236,913</span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">)</span></td></tr>
  <tr id="xdx_401_eus-gaap--LongTermDebt_iTI_pp0p0_mtLTDzrgw_zXoiqTV25pye" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="padding-left: 10pt; text-align: left; padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">Total</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td style="border-bottom: Black 2.5pt double; text-align: right"><span style="font-family: Times New Roman, Times, Serif">5,763,087</span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
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<span></span>
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<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ScheduleOfDebtTableTextBlock', window );">Schedule of Debt</a></td>
<td class="text"><p id="xdx_899_eus-gaap--ScheduleOfDebtTableTextBlock_zxTOtvYAFLbl" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">On
June 18, 2021, as a condition of entering into the SVB Loan Facility, the Company paid the outstanding principal balance,
an early termination fee and the end of term charges in full satisfaction of the Horizon Credit Agreement, as amended.
Following is a schedule of the amounts paid to Horizon on June 18, 2021.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;<span id="xdx_8BB_zkVw8gEY8R8b" style="display: none">Schedule
of Debt</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; margin-left: auto; border-collapse: collapse; width: 80%; margin-right: auto">
  <tr style="vertical-align: bottom; background-color: White">
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
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    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_98A_eus-gaap--LineOfCredit_iS_pp0p0_c20210619__20210630__dei--LegalEntityAxis__custom--HorizonTechnologyFinanceCorporationMember_zAmYhkUZFuhk" style="width: 16%; text-align: right" title="Line of credit, beginning balance"><span style="font-family: Times New Roman, Times, Serif">5,000,000</span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
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    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_985_ecustom--EarlyTerminationFees_c20210619__20210630__dei--LegalEntityAxis__custom--HorizonTechnologyFinanceCorporationMember_zgVnQaVJ4SS5" style="text-align: right" title="Early termination fees"><span style="font-family: Times New Roman, Times, Serif">150,000</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
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    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_98D_ecustom--EndOfTermFees_pp0p0_c20210619__20210630__dei--LegalEntityAxis__custom--HorizonTechnologyFinanceCorporationMember_zMGjpuyzQG2i" style="border-bottom: Black 1.5pt solid; text-align: right" title="End of term charges"><span style="font-family: Times New Roman, Times, Serif">275,000</span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td style="padding-left: 10pt; padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">Total</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_986_eus-gaap--LineOfCredit_iE_pp0p0_c20210619__20210630__dei--LegalEntityAxis__custom--HorizonTechnologyFinanceCorporationMember_zD1y3El5W0k4" style="border-bottom: Black 2.5pt double; text-align: right" title="Line of credit, ending balance"><span style="font-family: Times New Roman, Times, Serif">5,425,000</span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
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<span style="display: none;">v3.21.2</span><table class="report" border="0" cellspacing="2" id="idm140561283041832">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Stock-Based Compensation (Tables)<br></strong></div></th>
<th class="th" colspan="1">6 Months Ended</th>
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<tr><th class="th"><div>Jun. 30, 2021</div></th></tr>
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<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
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    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_984_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_iS_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--RestrictedStockMember_zqUlMKUubbcj" style="width: 9%; text-align: right" title="Number Outstanding, Non-vested stock awards, Outstanding, Beginning balance"><span style="font-family: Times New Roman, Times, Serif">2,750</span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="width: 9%; text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">Equity awards granted</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_986_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_pdd" style="text-align: right" title="Number Outstanding, Options granted"><span style="font-family: Times New Roman, Times, Serif">2,154,000</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_987_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--RestrictedStockMember_pdd" style="text-align: right" title="Number Outstanding, Non-vested stock awards, Granted"><span style="font-family: Times New Roman, Times, Serif">7,000</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">Equity awards exercised or vested and issued</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_980_eus-gaap--StockIssuedDuringPeriodSharesStockOptionsExercised_iN_di_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zz9vwH6dwF9d" style="text-align: right" title="Number Outstanding, Options exercised or vested and issued"><span style="font-family: Times New Roman, Times, Serif">(7,500</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">)</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_985_eus-gaap--ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_pdd" style="text-align: right" title="Weighted Average Exercise Price, Options exercised or vested and issued"><span style="font-family: Times New Roman, Times, Serif">0.63</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_984_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--RestrictedStockMember_pdd" style="text-align: right" title="Number Outstanding, Non-vested stock awards, exercised or vested and issued"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl1157">-</span></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_98A_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--RestrictedStockMember_pdd" style="text-align: right" title="Weighted Average Grant Date Fair Value, Non-vested stock awards, exercised or vested and issued"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl1159">-</span></span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">Equity awards forfeited,
    cancelled or expired</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_983_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod_iN_di_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_zfFZt1TlTe2f" style="border-bottom: Black 1.5pt solid; text-align: right" title="Number Outstanding, Options canceled or expired"><span style="font-family: Times New Roman, Times, Serif">(92,646</span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">)</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_981_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--EmployeeStockOptionMember_pdd" style="padding-bottom: 1.5pt; text-align: right" title="Weighted Average Exercise Price, Options canceled or expired"><span style="font-family: Times New Roman, Times, Serif">2.69</span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_98B_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--RestrictedStockMember_pdd" style="border-bottom: Black 1.5pt solid; text-align: right" title="Number Outstanding, Non-vested stock awards, Forfeited"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl1165">-</span></span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_98E_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_c20210101__20210630__us-gaap--AwardTypeAxis__us-gaap--RestrictedStockMember_pdd" style="padding-bottom: 1.5pt; text-align: right" title="Weighted Average Grant Date Fair Value, Non-vested stock awards, Forfeited"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl1167">-</span></span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt; text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left; padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">Equity awards outstanding
    at June 30, 2021</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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  <tr style="vertical-align: bottom; background-color: White">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left; padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">Aggregate intrinsic
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  <tr style="vertical-align: bottom; background-color: White">
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  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left; padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">Equity awards exercisable
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    <td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt; text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt; text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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  <tr style="vertical-align: bottom; background-color: White">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left; padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">Aggregate intrinsic
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    <td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt; text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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    <td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt; text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt; text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  </table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></p>

<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock', window );">Schedule of Assumptions Used to Determine Fair Value of Options Granted</a></td>
<td class="text"><p id="xdx_89C_eus-gaap--ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock_zvVrpPRBlNSd" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">The
fair values of stock options granted were estimated at the date of grant using the Black-Scholes option pricing model. The Black-Scholes
model was originally developed for use in estimating the fair value of traded options, which have different characteristics from Celsion&#8217;s
stock options. The model is also sensitive to changes in assumptions, which can materially affect the fair value estimate. The Company
used the following assumptions for determining the fair value of options granted under the Black-Scholes option pricing model:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;<span id="xdx_8B1_zAvmRlNBERij" style="display: none">Schedule
of Assumptions Used to Determine Fair Value of Options Granted</span></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"/>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1.5pt"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif; padding-bottom: 1.5pt"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
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                                            Months Ended June 30, &#160;</b></span></td><td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1.5pt; text-align: left"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1.5pt"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif; padding-bottom: 1.5pt"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: bold 10pt Times New Roman, Times, Serif; padding-bottom: 1.5pt; text-align: left"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 1.5pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">2021</span></td><td style="font: bold 10pt Times New Roman, Times, Serif; padding-bottom: 1.5pt; text-align: left"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td><td style="font: bold 10pt Times New Roman, Times, Serif; padding-bottom: 1.5pt"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: bold 10pt Times New Roman, Times, Serif; padding-bottom: 1.5pt; text-align: left"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 1.5pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif">2020</span></td><td style="font: bold 10pt Times New Roman, Times, Serif; padding-bottom: 1.5pt; text-align: left"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; width: 60%; text-align: left"><span style="font: 10pt Times New Roman, Times, Serif">Risk-free
    interest rate</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 2%"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 16%; text-align: right"><span id="xdx_90C_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum_pid_dp_c20210101__20210630_zbHSZSVsxGng" style="font: 10pt Times New Roman, Times, Serif">1.56
                                            </span><span style="font: 10pt Times New Roman, Times, Serif">to <span id="xdx_90C_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum_pid_dp_c20210101__20210630_z61dC6LUBpG7">1.74</span></span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font: 10pt Times New Roman, Times, Serif">%</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 2%"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 16%; text-align: right"><span id="xdx_90D_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum_pid_dp_c20200101__20200630_zsBDu6znfba7" style="font: 10pt Times New Roman, Times, Serif">0.71
                                            </span><span style="font: 10pt Times New Roman, Times, Serif">to <span id="xdx_903_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum_pid_dp_c20200101__20200630_z4h3tRgTmWW3">1.33</span></span></td><td style="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">%</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font: 10pt Times New Roman, Times, Serif">Expected
    volatility</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span id="xdx_908_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum_pid_dp_c20210101__20210630_zOviDMd7lCtf" style="font: 10pt Times New Roman, Times, Serif">106.8
                                            </span><span style="font: 10pt Times New Roman, Times, Serif">to <span id="xdx_904_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum_pid_dp_c20210101__20210630_zY4Mod2WgDI">113.0</span></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font-family: Times New Roman, Times, Serif">%</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span id="xdx_901_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum_pid_dp_c20200101__20200630_zNHIZ28tcg1d" style="font: 10pt Times New Roman, Times, Serif">100.4
                                            </span><span style="font: 10pt Times New Roman, Times, Serif">to <span id="xdx_904_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum_pid_dp_c20200101__20200630_zmTjM8Vk6KF7">104.2</span></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font: 10pt Times New Roman, Times, Serif">%</span></td></tr>
  <tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font: 10pt Times New Roman, Times, Serif">Expected
    life (in years)</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span id="xdx_90D_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_dtY_c20210101__20210630__srt--RangeAxis__srt--MinimumMember_zUnxBpAcWXsk" style="font: 10pt Times New Roman, Times, Serif">7.5
                                            </span><span style="font: 10pt Times New Roman, Times, Serif">to <span id="xdx_904_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_dtY_c20210101__20210630__srt--RangeAxis__srt--MaximumMember_ziitPTyChS7f">10.0</span></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: right"><span style="font: 10pt Times New Roman, Times, Serif">&#160;<span id="xdx_903_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_dtY_c20200101__20200630__srt--RangeAxis__srt--MinimumMember_z68gZQbmans4">8.5
                                            </span></span><span style="font: 10pt Times New Roman, Times, Serif">to
                                            <span id="xdx_901_eus-gaap--SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_dtY_c20200101__20200630__srt--RangeAxis__srt--MaximumMember_zW5npx7wLpgg">10.0</span></span><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td></tr>
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    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font: 10pt Times New Roman, Times, Serif">Expected
    dividend yield</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_98F_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_pid_dpxL_c20210101__20210630_zIH0kzCyLy2g" style="font: 10pt Times New Roman, Times, Serif; text-align: right" title="Expected dividend yield::XDX::0"><span style="font: 10pt Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl1203">-</span></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font: 10pt Times New Roman, Times, Serif">%</span></td><td style="font: 10pt Times New Roman, Times, Serif"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_981_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_pid_dpxL_c20200101__20200630_zv50SIQiZlGk" style="font: 10pt Times New Roman, Times, Serif; text-align: right" title="Expected dividend yield::XDX::0"><span style="font: 10pt Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl1205">-</span></span></td><td style="font: 10pt Times New Roman, Times, Serif; text-align: left"><span style="font: 10pt Times New Roman, Times, Serif">%</span></td></tr>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Summary of Stock Option And Restricted Stock Awards [Table Text Block]</p></div>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.</p></div>
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<span style="display: none;">v3.21.2</span><table class="report" border="0" cellspacing="2" id="idm140561283103352">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Earn-Out Milestone Liability (Tables)<br></strong></div></th>
<th class="th" colspan="1">6 Months Ended</th>
</tr>
<tr><th class="th"><div>Jun. 30, 2021</div></th></tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_DisclosureEarnoutMilestoneLiabilityAbstract', window );"><strong>Earn-out Milestone Liability</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_ScheduleOfChangesInEarnOutMilestoneLiabilitiesTableTextBlock', window );">Schedule of Changes in Earn-out Milestone Liability</a></td>
<td class="text"><p id="xdx_896_ecustom--ScheduleOfChangesInEarnOutMilestoneLiabilitiesTableTextBlock_zg2vwNiSH1K5" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">The
following is a summary of the changes in the earn-out milestone liability for the six-month period ended June 30, 2021:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;<span id="xdx_8B2_z8jvCwx4n2j5" style="display: none">Schedule
of Changes in Earn-out Milestone Liability</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="display: none; vertical-align: bottom; background-color: White">
    <td style="display: none; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="display: none"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="display: none; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="display: none; text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="display: none; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
<tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="width: 80%"><span style="font-family: Times New Roman, Times, Serif">Balance at January 1, 2021</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_981_ecustom--EarnoutMilestoneLiability_iS_pp0p0_c20210101__20210630_zfgHFwac9LC5" style="width: 16%; text-align: right" title="Earn-out liabilities, beginning balance"><span style="font-family: Times New Roman, Times, Serif">(7,018,000</span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">)</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td style="text-align: left; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">Non-cash loss from the
    change in fair value</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_98A_ecustom--GainLossFromChangeInFairValueOfEarnOutMilestoneLiability_c20210101__20210630_pp0p0" style="border-bottom: Black 1.5pt solid; text-align: right" title="Non-cash gain loss from the adjustment for the change in fair value"><span style="font-family: Times New Roman, Times, Serif">(70,000</span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">)</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">Balance at June 30, 2021</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_98A_ecustom--EarnoutMilestoneLiability_iE_pp0p0_c20210101__20210630_zF3silNymLdi" style="border-bottom: Black 2.5pt double; text-align: right" title="Earn-out liabilities, ending balance"><span style="font-family: Times New Roman, Times, Serif">(7,088,000</span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">)</span></td></tr>
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<span></span>
</td>
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<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_ScheduleOfRiskadjustmentAssessmentTableTextBlock', window );">Schedule of Risk Adjustment Assessment</a></td>
<td class="text"><p id="xdx_898_ecustom--ScheduleOfRiskadjustmentAssessmentTableTextBlock_zO1NEdKx5kH" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">The
following is a schedule of the Company&#8217;s risk-adjustment assessment of each milestone:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;<span id="xdx_8BD_zLRJ6Thwwb7i" style="display: none">Schedule
of Risk Adjustment Assessment</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="vertical-align: bottom">
    <td style="border-bottom: Black 1.5pt solid; text-align: center"><span style="font-family: Times New Roman, Times, Serif">Date</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>Risk-adjustment
                                            Assessment</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>of
                                            Achieving Each Milestone</b></span></p></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"><span style="font-family: Times New Roman, Times, Serif">Discount
    Rate</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: center"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>Estimated
                                            Time</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>to
                                            Achieve</b></span></p></td></tr>
  <tr style="vertical-align: bottom">
    <td style="text-align: justify"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="text-align: center"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="text-align: center"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: center"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="width: 44%; text-align: justify"><span style="font-family: Times New Roman, Times, Serif">June 30, 2021</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_98C_ecustom--RiskadjustmentAssessmentOfAchievingMilestone_pid_dp_c20210101__20210630_ztRZNKc1f1I" style="width: 13%; text-align: right" title="Risk-adjustment Assessment of achieving each Milestone"><span style="font-family: Times New Roman, Times, Serif">80</span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">%</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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  <tr style="vertical-align: bottom; background-color: White">
    <td style="text-align: justify"><span style="font-family: Times New Roman, Times, Serif">March 31, 2021</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_98A_ecustom--RiskadjustmentAssessmentOfAchievingMilestone_pid_dp_c20210101__20210331_zY1Iv8PYEvyc" style="text-align: right" title="Risk-adjustment Assessment of achieving each Milestone"><span style="font-family: Times New Roman, Times, Serif">80</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">%</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_98D_ecustom--DiscountRatesOnMileStoneLiabilities_pid_dp_c20210101__20210331_zvh5TKmdNpp1" style="text-align: right" title="Discount Rate"><span style="font-family: Times New Roman, Times, Serif">9</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">%</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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    </span></span><span style="font-family: Times New Roman, Times, Serif">years</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: justify"><span style="font-family: Times New Roman, Times, Serif">December 31, 2020</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_982_ecustom--RiskadjustmentAssessmentOfAchievingMilestone_pid_dp_c20200101__20201231_zmiycbmZaiel" style="text-align: right" title="Risk-adjustment Assessment of achieving each Milestone"><span style="font-family: Times New Roman, Times, Serif">80</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">%</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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    <td style="text-align: right"><span id="xdx_90C_ecustom--EstimatedTimeToAchieveMileStone_dtY_c20200101__20201231__srt--RangeAxis__srt--MinimumMember_zmbUCcKbn2fb" style="font-family: Times New Roman, Times, Serif">0.54
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    </span></span><span style="font-family: Times New Roman, Times, Serif">years</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td style="text-align: justify"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: justify"><span style="font-family: Times New Roman, Times, Serif">June 30, 2020</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_988_ecustom--RiskadjustmentAssessmentOfAchievingMilestone_pid_dp_c20200101__20200630_zGc1e3DNHwwj" style="text-align: right" title="Risk-adjustment Assessment of achieving each Milestone"><span style="font-family: Times New Roman, Times, Serif">80</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">%</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_983_ecustom--DiscountRatesOnMileStoneLiabilities_pid_dp_c20200101__20200630_zX0YcalEWrh7" style="text-align: right" title="Discount Rate"><span style="font-family: Times New Roman, Times, Serif">9</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">%</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: right"><span id="xdx_90C_ecustom--EstimatedTimeToAchieveMileStone_dtY_c20200101__20200630__srt--RangeAxis__srt--MinimumMember_zt7tUOXUIJAf" style="font-family: Times New Roman, Times, Serif">0.54
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    </span></span><span style="font-family: Times New Roman, Times, Serif">years</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td style="text-align: justify"><span style="font-family: Times New Roman, Times, Serif">March 31, 2020</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_98D_ecustom--DiscountRatesOnMileStoneLiabilities_pid_dp_c20200101__20200331_zSl9XdEFA8i8" style="text-align: right" title="Discount Rate"><span style="font-family: Times New Roman, Times, Serif">9</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">%</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: right"><span id="xdx_903_ecustom--EstimatedTimeToAchieveMileStone_dtY_c20200101__20200331__srt--RangeAxis__srt--MinimumMember_zTxJcY5cbtB8" style="font-family: Times New Roman, Times, Serif">1.04
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    </span></span><span style="font-family: Times New Roman, Times, Serif">years</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: justify"><span style="font-family: Times New Roman, Times, Serif">December 31, 2019</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_98F_ecustom--RiskadjustmentAssessmentOfAchievingMilestone_pid_dp_c20190101__20191231_z5cHHwdO0F3a" style="text-align: right" title="Risk-adjustment Assessment of achieving each Milestone"><span style="font-family: Times New Roman, Times, Serif">80</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">%</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_98D_ecustom--DiscountRatesOnMileStoneLiabilities_pid_dp_c20190101__20191231_zD0krJglEmxi" style="text-align: right" title="Discount Rate"><span style="font-family: Times New Roman, Times, Serif">9</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">%</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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    </span></span><span style="font-family: Times New Roman, Times, Serif">years</span></td></tr>
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<span></span>
</td>
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<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_CLSN_DisclosureEarnoutMilestoneLiabilityAbstract">
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">CLSN_DisclosureEarnoutMilestoneLiabilityAbstract</td>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The disclosure of transactions regarding the changes in earn-out liabilities during the period.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Schedule Of Risk adjustment Assessment [Table Text Block]</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
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<span style="display: none;">v3.21.2</span><table class="report" border="0" cellspacing="2" id="idm140561281372280">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Warrants (Tables)<br></strong></div></th>
<th class="th" colspan="1">6 Months Ended</th>
</tr>
<tr><th class="th"><div>Jun. 30, 2021</div></th></tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_DisclosureWarrantsAbstract', window );"><strong>Warrants</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ScheduleOfStockholdersEquityNoteWarrantsOrRightsTextBlock', window );">Summary of Warrant Activity</a></td>
<td class="text"><p id="xdx_89A_eus-gaap--ScheduleOfStockholdersEquityNoteWarrantsOrRightsTextBlock_zyLOReG12MB1" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Following
is a summary of all warrant activity for the six months ended June 30, 2021:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;<span id="xdx_8B5_zuNPNjGPNfbh" style="display: none">Summary
of Warrant Activity</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="vertical-align: bottom">
    <td style="border-bottom: Black 1.5pt solid"><span style="font-family: Times New Roman, Times, Serif">Warrants</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>Number
                                            of<br/> Warrants</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>Issued</b></span></p></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" style="border-bottom: Black 1.5pt solid; text-align: center"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>Weighted</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>Average</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>Exercise
                                            Price</b></span></p></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="width: 60%"><span style="font-family: Times New Roman, Times, Serif">Warrants outstanding at December 31, 2020</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_981_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber_iS_c20210101__20210630_zAhiFozzRZib" style="width: 16%; text-align: right" title="Number of Warrants Issued, Warrants outstanding, Beginning balance"><span style="font-family: Times New Roman, Times, Serif">3,853,566</span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_989_ecustom--ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingWeightedAverageExercisePrice_iS_c20210101__20210630_zqVVyHompmr8" style="width: 16%; text-align: right" title="Weighted Average Exercise Price, Warrants outstanding, Beginning balance"><span style="font-family: Times New Roman, Times, Serif">1.35</span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">Warrants exercised during the six
    months ended June 30, 2021 (see Note 12)</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_98F_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised_iN_di_c20210101__20210630_zHPeBD6O7QY5" style="border-bottom: Black 1.5pt solid; text-align: right" title="Number of Warrants Issued, Warrants exercised"><span style="font-family: Times New Roman, Times, Serif">(1,216,667</span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">)</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_988_ecustom--ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExerciseInPeriodWeightedAverageExercisePrice_c20210101__20210630_pdd" style="padding-bottom: 1.5pt; text-align: right" title="Weighted Average Exercise Price, Warrants exercised"><span style="font-family: Times New Roman, Times, Serif">1.24</span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">Warrants outstanding at June 30,
    2021</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td id="xdx_98A_eus-gaap--ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber_iE_c20210101__20210630_zBZnYIt9d2i2" style="border-bottom: Black 2.5pt double; text-align: right" title="Number of Warrants Issued, Warrants outstanding, Ending balance"><span style="font-family: Times New Roman, Times, Serif">2,636,899</span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_98B_ecustom--ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingWeightedAverageExercisePrice_iE_c20210101__20210630_zHc7RRbT6gP6" style="padding-bottom: 2.5pt; text-align: right" title="Weighted Average Exercise Price, Warrants outstanding, Ending balance"><span style="font-family: Times New Roman, Times, Serif">1.40</span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
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    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">Aggregate intrinsic value of outstanding
    warrants at June 30, 2021</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 2.5pt double; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td id="xdx_98A_ecustom--ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionsOutstandingIntrinsicValue_iE_pp0p0_c20210101__20210630_zvgKs6wzw12k" style="border-bottom: Black 2.5pt double; text-align: right" title="Aggregate intrinsic value of outstanding warrants"><span style="font-family: Times New Roman, Times, Serif">159,857</span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt; text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 2.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td><span style="font-family: Times New Roman, Times, Serif">Weighted average remaining contractual terms at June 30, 2021</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span id="xdx_90E_ecustom--SharebasedCompensationArrangementBySharebasedPaymentAwardNonOptionsOutstandingWeightedAverageRemainingContractualTerm2_dtY_c20210101__20210630_ztBClSvcASZk" style="font: 10pt Times New Roman, Times, Serif">4.6
                                            </span><span style="font: 10pt Times New Roman, Times, Serif">years</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Tabular disclosure of warrants or rights issued. Warrants and rights outstanding are derivative securities that give the holder the right to purchase securities (usually equity) from the issuer at a specific price within a certain time frame. Warrants are often included in a new debt issue to entice investors by a higher return potential. The main difference between warrants and call options is that warrants are issued and guaranteed by the company, whereas options are exchange instruments and are not issued by the company. Also, the lifetime of a warrant is often measured in years, while the lifetime of a typical option is measured in months. Disclose the title of issue of securities called for by warrants and rights outstanding, the aggregate amount of securities called for by warrants and rights outstanding, the date from which the warrants or rights are exercisable, and the price at which the warrant or right is exercisable.</p></div>
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<span style="display: none;">v3.21.2</span><table class="report" border="0" cellspacing="2" id="idm140561281316840">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Leases (Tables)<br></strong></div></th>
<th class="th" colspan="1">6 Months Ended</th>
</tr>
<tr><th class="th"><div>Jun. 30, 2021</div></th></tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_DisclosureLeasesAbstract', window );"><strong>Leases</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock', window );">Schedule of Lease Payments and Maturity of Operating Lease Liabilities</a></td>
<td class="text"><p id="xdx_890_eus-gaap--LesseeOperatingLeaseLiabilityMaturityTableTextBlock_z4RySOfHK1V8" style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">Following
is a table of the lease payments and maturity of our operating lease liabilities as of June 30, 2021:</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><span style="font: 10pt Times New Roman, Times, Serif">&#160;<span id="xdx_8B7_zyKGaaw0an66" style="display: none">Schedule
of Lease Payments and Maturity of Operating Lease Liabilities</span></span></p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%">
  <tr style="vertical-align: bottom">
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td colspan="2" id="xdx_495_20210630_zE9yRm7JS5b1" style="border-bottom: Black 1.5pt solid; text-align: center"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>For
                                            the</b></span></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><b>year
                                            ending<br/> June 30,</b></span></p></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_40C_eus-gaap--LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_iI_pp0p0_maLOLLPzRpH_zbZY95qxpQc5" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left; width: 80%"><span style="font-family: Times New Roman, Times, Serif">Remainder of 2021</span></td><td style="width: 2%"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td style="width: 16%; text-align: right"><span style="font-family: Times New Roman, Times, Serif">266,188</span></td><td style="width: 1%; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_402_eus-gaap--LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_iI_pp0p0_maLOLLPzRpH_z06zh07qOhj9" style="vertical-align: bottom; background-color: White">
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">2022</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">535,579</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_40B_eus-gaap--LesseeOperatingLeaseLiabilityPaymentsDueYearThree_iI_pp0p0_maLOLLPzRpH_zV55xrWo0Y9h" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">2023</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">233,116</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_409_ecustom--LesseeOperatingLeaseLiabilityPaymentsDueAfterYearThreeAndThereAfter_iI_pp0p0_maLOLLPzRpH_z8CQV3Hxu8o7" style="vertical-align: bottom; background-color: White">
    <td style="text-align: left; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">2024 and thereafter</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif"><span style="-sec-ix-hidden: xdx2ixbrl1316">&#160;</span></span></td><td style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif">-</span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_40F_eus-gaap--LesseeOperatingLeaseLiabilityPaymentsDue_iTI_pp0p0_mtLOLLPzRpH_zxkN4KFxThYc" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">Subtotal future lease payments</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">1,034,883</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr id="xdx_409_ecustom--OperatingLeaseImputedInterest_iNI_pp0p0_di_zxa1wWigBvZ1" style="vertical-align: bottom; background-color: White">
    <td style="padding-left: 10pt; text-align: left; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">Less
    imputed interest</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif">(101,664</span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">)</span></td></tr>
  <tr id="xdx_404_eus-gaap--OperatingLeaseLiability_iI_pp0p0_zI5OOCubORAk" style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">Total lease liabilities</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">$</span></td><td style="border-bottom: Black 1.5pt solid; text-align: right"><span style="font-family: Times New Roman, Times, Serif">933,219</span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left; padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">Weighted average remaining
    life</span></td><td style="padding-bottom: 1.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="border-bottom: Black 1.5pt solid; text-align: right"><span id="xdx_905_eus-gaap--OperatingLeaseWeightedAverageRemainingLeaseTerm1_iI_dtY_c20210630_zDfXmVicMJyg" style="font: 10pt Times New Roman, Times, Serif">2.0
                                            </span><span style="font: 10pt Times New Roman, Times, Serif">years</span></td><td style="padding-bottom: 1.5pt; text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: White">
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
    <td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: right"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td><td style="text-align: left"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td></tr>
  <tr style="vertical-align: bottom; background-color: rgb(204,238,255)">
    <td style="text-align: left; padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">Weighted average discount
    rate</span></td><td style="padding-bottom: 2.5pt"><span style="font-family: Times New Roman, Times, Serif">&#160;</span></td>
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  </table>

<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_CLSN_DisclosureLeasesAbstract">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">CLSN_DisclosureLeasesAbstract</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
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<td><strong> Data Type:</strong></td>
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<tr>
<td><strong> Balance Type:</strong></td>
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<td><strong> Period Type:</strong></td>
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</tr>
</table></div>
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</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Tabular disclosure of undiscounted cash flows of lessee's operating lease liability. Includes, but is not limited to, reconciliation of undiscounted cash flows to operating lease liability recognized in statement of financial position.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -Section 50<br> -Paragraph 6<br> -URI http://asc.fasb.org/extlink&amp;oid=123408670&amp;loc=SL77918701-209980<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock</td>
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<tr>
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<span style="display: none;">v3.21.2</span><table class="report" border="0" cellspacing="2" id="idm140561278978296">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Financial Condition and Business Plan (Details Narrative) - USD ($)<br></strong></div></th>
<th class="th" colspan="1"></th>
<th class="th" colspan="1"></th>
<th class="th" colspan="1"></th>
<th class="th" colspan="1"></th>
<th class="th" colspan="4">1 Months Ended</th>
<th class="th" colspan="1">6 Months Ended</th>
<th class="th" colspan="2">12 Months Ended</th>
<th class="th" colspan="1"></th>
<th class="th" colspan="1"></th>
</tr>
<tr>
<th class="th"><div>Jun. 16, 2021</div></th>
<th class="th"><div>May 10, 2021</div></th>
<th class="th"><div>Mar. 19, 2021</div></th>
<th class="th"><div>Aug. 28, 2020</div></th>
<th class="th"><div>Jun. 18, 2021</div></th>
<th class="th"><div>Jan. 31, 2021</div></th>
<th class="th"><div>Sep. 30, 2020</div></th>
<th class="th"><div>Jun. 30, 2018</div></th>
<th class="th"><div>Jun. 30, 2021</div></th>
<th class="th"><div>Dec. 31, 2019</div></th>
<th class="th"><div>Dec. 31, 2018</div></th>
<th class="th"><div>Apr. 05, 2021</div></th>
<th class="th"><div>Dec. 31, 2020</div></th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems', window );"><strong>Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_RetainedEarningsAccumulatedDeficit', window );">Retained Earnings (Accumulated Deficit)</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 323,137,741<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 312,000,341<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_CashAndCashEquivalentsRestrictedCashShorttermInvestmentsAndReceivableOnSaleOfNetOperatingLosses', window );">[custom:CashAndCashEquivalentsRestrictedCashShorttermInvestmentsAndReceivableOnSaleOfNetOperatingLosses-0]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">64,500,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_ReceivableOnSaleOfNetOperatingLosses', window );">[custom:ReceivableOnSaleOfNetOperatingLosses-0]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 1,850,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_TypeOfArrangementAxis=CLSN_HorizonCreditAgreementMember', window );">Horizon Credit Agreement [Member] | Horizon Technology Finance Corporation [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems', window );"><strong>Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ProceedsFromContributedCapital', window );">Proceeds from Contributed Capital</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 10,000,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_DebtInstrumentFaceAmount', window );">Debt Instrument, Face Amount</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 10,000,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_TypeOfArrangementAxis=CLSN_HorizonCreditAgreementMember', window );">Horizon Credit Agreement [Member] | Horizon Technology Finance Corporation [Member] | London Interbank Offered Rate (LIBOR) [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems', window );"><strong>Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_DebtInstrumentInterestRateStatedPercentage', window );">Debt Instrument, Interest Rate, Stated Percentage</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">7.625%<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_TypeOfArrangementAxis=CLSN_AmendmentToHorizonCreditAgreementMember', window );">Amendment to Horizon Credit Agreement [Member] | Horizon Technology Finance Corporation [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems', window );"><strong>Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_RepaymentsOfNotesPayable', window );">Repayments of Notes Payable</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">5,000,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_DebtInstrumentFaceAmount', window );">Debt Instrument, Face Amount</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">5,000,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_PaymentOfDebtEndTermCharges', window );">Debt instrument related end term charges</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 200,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_TypeOfArrangementAxis=CLSN_SVBLoanFacilityMember', window );">SVB Loan Facility [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems', window );"><strong>Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_DebtInstrumentInterestRateStatedPercentage', window );">Debt Instrument, Interest Rate, Stated Percentage</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">3.25%<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity', window );">Line of Credit Facility, Maximum Borrowing Capacity</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 10,000,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity', window );">Line of Credit Facility, Remaining Borrowing Capacity</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 4,000,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_DebtInstrumentDescription', window );">Debt Instrument, Description</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">Payments
under the loan agreement are interest only for the first 24 months after loan closing, followed by a 24-month amortization period of
principal and interest through the scheduled maturity date.<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">Payments
under the loan agreement are interest only for the first 24 months after loan closing, followed by a 24-month amortization period of
principal and interest through the scheduled maturity date.<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_TypeOfArrangementAxis=CLSN_SVBLoanFacilityMember', window );">SVB Loan Facility [Member] | Silicon Valley Bank [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems', window );"><strong>Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity', window );">Line of Credit Facility, Maximum Borrowing Capacity</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 10,000,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 10,000,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity', window );">Line of Credit Facility, Remaining Borrowing Capacity</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 4,000,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_TypeOfArrangementAxis=CLSN_SVBLoanFacilityMember', window );">SVB Loan Facility [Member] | Prime Rate [Member] | Silicon Valley Bank [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems', window );"><strong>Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_DebtInstrumentInterestRateStatedPercentage', window );">Debt Instrument, Interest Rate, Stated Percentage</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">3.25%<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_TypeOfArrangementAxis=CLSN_SVBLoanFacilityMember', window );">SVB Loan Facility [Member] | Horizon Technology Finance Corporation [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems', window );"><strong>Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_RepaymentOfOutstandingIndebtednessAmount', window );">[custom:RepaymentOfOutstandingIndebtednessAmount-0]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 6,000,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_TypeOfArrangementAxis=CLSN_CapitalOnDemandTMSalesAgreementMember', window );">Capital on DemandTM Sales Agreement [Member] | Jones Trading Institutional Services, LLC [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems', window );"><strong>Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_CashAndCashEquivalentsRestrictedCashShorttermInvestmentsAndReceivableOnSaleOfNetOperatingLosses', window );">[custom:CashAndCashEquivalentsRestrictedCashShorttermInvestmentsAndReceivableOnSaleOfNetOperatingLosses-0]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 64,500,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ProceedsFromContributedCapital', window );">Proceeds from Contributed Capital</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 6,900,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_DebtInstrumentFaceAmount', window );">Debt Instrument, Face Amount</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 35,000,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 15,000,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ProceedsFromWarrantExercises', window );">Proceeds from Warrant Exercises</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 1,500,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_srt_StatementGeographicalAxis=CLSN_NJMember', window );">New Jersey [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems', window );"><strong>Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_NetProceedsFromSaleOfNetOperatingLosses', window );">[custom:NetProceedsFromSaleOfNetOperatingLosses]</a></td>
<td class="nump">$ 1,600,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 2,000,000.0<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 12,200,000<span></span>
</td>
<td class="nump">$ 13,000,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_srt_StatementGeographicalAxis=CLSN_NJMember', window );">New Jersey [Member] | Minimum [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems', window );"><strong>Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_NetProceedsFromSaleOfNetOperatingLosses', window );">[custom:NetProceedsFromSaleOfNetOperatingLosses]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 15,000,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_srt_StatementGeographicalAxis=CLSN_NJMember', window );">New Jersey [Member] | Maximum [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems', window );"><strong>Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_NetProceedsFromSaleOfNetOperatingLosses', window );">[custom:NetProceedsFromSaleOfNetOperatingLosses]</a></td>
<td class="nump">$ 1,400,000<span></span>
</td>
<td class="nump">$ 20,000,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_CLSN_CashAndCashEquivalentsRestrictedCashShorttermInvestmentsAndReceivableOnSaleOfNetOperatingLosses">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Cash and cash equivalents, restricted cash short-term investments and receivable on sale of net operating losses.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">CLSN_CashAndCashEquivalentsRestrictedCashShorttermInvestmentsAndReceivableOnSaleOfNetOperatingLosses</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>CLSN_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_CLSN_NetProceedsFromSaleOfNetOperatingLosses">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Net proceeds from sale of net operating losses.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">CLSN_NetProceedsFromSaleOfNetOperatingLosses</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>CLSN_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_CLSN_PaymentOfDebtEndTermCharges">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Debt instrument related end term charges.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">CLSN_PaymentOfDebtEndTermCharges</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>CLSN_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_CLSN_ReceivableOnSaleOfNetOperatingLosses">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Receivable on sale of net operating losses.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">CLSN_ReceivableOnSaleOfNetOperatingLosses</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>CLSN_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_CLSN_RepaymentOfOutstandingIndebtednessAmount">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Repayment of outstanding indebtedness amount.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">CLSN_RepaymentOfOutstandingIndebtednessAmount</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>CLSN_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_DebtInstrumentDescription">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Identification of the lender and information about a contractual promise to repay a short-term or long-term obligation, which includes borrowings under lines of credit, notes payable, commercial paper, bonds payable, debentures, and other contractual obligations for payment. This may include rationale for entering into the arrangement, significant terms of the arrangement, which may include amount, repayment terms, priority, collateral required, debt covenants, borrowing capacity, call features, participation rights, conversion provisions, sinking-fund requirements, voting rights, basis for conversion if convertible and remarketing provisions. The description may be provided for individual debt instruments, rational groupings of debt instruments, or by debt in total.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 944<br> -SubTopic 210<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.7-03(16))<br> -URI http://asc.fasb.org/extlink&amp;oid=120400017&amp;loc=d3e572229-122910<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section 50<br> -Paragraph 3<br> -URI http://asc.fasb.org/extlink&amp;oid=123467817&amp;loc=d3e21475-112644<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 942<br> -SubTopic 210<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.9-03(16))<br> -URI http://asc.fasb.org/extlink&amp;oid=120398452&amp;loc=d3e534808-122878<br><br>Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(22))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 942<br> -SubTopic 210<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.9-03(13))<br> -URI http://asc.fasb.org/extlink&amp;oid=120398452&amp;loc=d3e534808-122878<br><br>Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(19))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 942<br> -SubTopic 470<br> -Section 50<br> -Paragraph 3<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=123599511&amp;loc=d3e64711-112823<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_DebtInstrumentDescription</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_DebtInstrumentFaceAmount">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Face (par) amount of debt instrument at time of issuance.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 20<br> -Section 50<br> -Paragraph 1B<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=123466505&amp;loc=SL123495323-112611<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 835<br> -SubTopic 30<br> -Section 45<br> -Paragraph 2<br> -URI http://asc.fasb.org/extlink&amp;oid=124435984&amp;loc=d3e28551-108399<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 835<br> -SubTopic 30<br> -Section 55<br> -Paragraph 8<br> -URI http://asc.fasb.org/extlink&amp;oid=114775985&amp;loc=d3e28878-108400<br><br>Reference 4: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 835<br> -SubTopic 30<br> -Section 50<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=124429444&amp;loc=SL124452920-239629<br><br>Reference 5: http://www.xbrl.org/2003/role/exampleRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 20<br> -Section 55<br> -Paragraph 69C<br> -URI http://asc.fasb.org/extlink&amp;oid=123466577&amp;loc=SL123495737-112612<br><br>Reference 6: http://www.xbrl.org/2003/role/exampleRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 20<br> -Section 55<br> -Paragraph 69B<br> -URI http://asc.fasb.org/extlink&amp;oid=123466577&amp;loc=SL123495735-112612<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_DebtInstrumentFaceAmount</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_DebtInstrumentInterestRateStatedPercentage">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Contractual interest rate for funds borrowed, under the debt agreement.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 20<br> -Section 50<br> -Paragraph 1B<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=123466505&amp;loc=SL123495323-112611<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.22(a)(1))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_DebtInstrumentInterestRateStatedPercentage</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dtr-types:percentItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.19(b),22(b))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.19(b),22(b))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ProceedsFromContributedCapital">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The cash inflow associated with the amount received by a corporation from a shareholder during the period.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 14<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3255-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ProceedsFromContributedCapital</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ProceedsFromWarrantExercises">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The cash inflow associated with the amount received from holders exercising their stock warrants.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 14<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3255-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ProceedsFromWarrantExercises</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_RepaymentsOfNotesPayable">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The cash outflow for a borrowing supported by a written promise to pay an obligation.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 15<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3291-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_RepaymentsOfNotesPayable</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_RetainedEarningsAccumulatedDeficit">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The cumulative amount of the reporting entity's undistributed earnings or deficit.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(30)(a)(3))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 2: http://www.xbrl.org/2003/role/exampleRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 852<br> -SubTopic 10<br> -Section 55<br> -Paragraph 10<br> -URI http://asc.fasb.org/extlink&amp;oid=84165509&amp;loc=d3e56426-112766<br><br>Reference 3: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 65<br> -Paragraph 15<br> -Subparagraph (g)(2)<br> -URI http://asc.fasb.org/extlink&amp;oid=121322162&amp;loc=SL121327923-165333<br><br>Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 944<br> -SubTopic 210<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.7-03(a)(23)(a)(4))<br> -URI http://asc.fasb.org/extlink&amp;oid=120400017&amp;loc=d3e572229-122910<br><br>Reference 5: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 944<br> -SubTopic 40<br> -Section 65<br> -Paragraph 2<br> -Subparagraph (h)(2)<br> -URI http://asc.fasb.org/extlink&amp;oid=124501264&amp;loc=SL117420844-207641<br><br>Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.3-04)<br> -URI http://asc.fasb.org/extlink&amp;oid=120397183&amp;loc=d3e187085-122770<br><br>Reference 7: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 944<br> -SubTopic 40<br> -Section 65<br> -Paragraph 2<br> -Subparagraph (g)(2)(i)<br> -URI http://asc.fasb.org/extlink&amp;oid=124501264&amp;loc=SL117420844-207641<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_RetainedEarningsAccumulatedDeficit</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_TypeOfArrangementAxis=CLSN_HorizonCreditAgreementMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_TypeOfArrangementAxis=CLSN_HorizonCreditAgreementMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_LegalEntityAxis=CLSN_HorizonTechnologyFinanceCorporationMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_LegalEntityAxis=CLSN_HorizonTechnologyFinanceCorporationMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_TypeOfArrangementAxis=CLSN_AmendmentToHorizonCreditAgreementMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_TypeOfArrangementAxis=CLSN_AmendmentToHorizonCreditAgreementMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_TypeOfArrangementAxis=CLSN_SVBLoanFacilityMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_TypeOfArrangementAxis=CLSN_SVBLoanFacilityMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=CLSN_SiliconValleyBankMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=CLSN_SiliconValleyBankMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
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<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
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<tr>
<td><strong> Period Type:</strong></td>
<td></td>
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</div></td></tr>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_VariableRateAxis=us-gaap_PrimeRateMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_VariableRateAxis=us-gaap_PrimeRateMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
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<td><strong> Data Type:</strong></td>
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<tr>
<td><strong> Balance Type:</strong></td>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_TypeOfArrangementAxis=CLSN_CapitalOnDemandTMSalesAgreementMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_TypeOfArrangementAxis=CLSN_CapitalOnDemandTMSalesAgreementMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
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<tr>
<td><strong> Data Type:</strong></td>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_LegalEntityAxis=CLSN_JonesTradingInstitutionalServicesLLCMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_LegalEntityAxis=CLSN_JonesTradingInstitutionalServicesLLCMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_srt_StatementGeographicalAxis=CLSN_NJMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">srt_StatementGeographicalAxis=CLSN_NJMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_srt_RangeAxis=srt_MinimumMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">srt_RangeAxis=srt_MinimumMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_srt_RangeAxis=srt_MaximumMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">srt_RangeAxis=srt_MaximumMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
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<td><strong> Period Type:</strong></td>
<td></td>
</tr>
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<DOCUMENT>
<TYPE>XML
<SEQUENCE>47
<FILENAME>R37.htm
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
<html>
<head>
<title></title>
<link rel="stylesheet" type="text/css" href="report.css">
<script type="text/javascript" src="Show.js">/* Do Not Remove This Comment */</script><script type="text/javascript">
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<body>
<span style="display: none;">v3.21.2</span><table class="report" border="0" cellspacing="2" id="idm140561287555768">
<tr>
<th class="tl" colspan="1" rowspan="1"><div style="width: 200px;"><strong>Schedule of Cash and Cash Equivalents and Restricted Cash (Details) - USD ($)<br></strong></div></th>
<th class="th"><div>Jun. 30, 2021</div></th>
<th class="th"><div>Dec. 31, 2020</div></th>
<th class="th"><div>Jun. 30, 2020</div></th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ReceivablesAbstract', window );"><strong>Receivables [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CashAndCashEquivalentsAtCarryingValue', window );">Cash and cash equivalents</a></td>
<td class="nump">$ 26,437,424<span></span>
</td>
<td class="nump">$ 17,164,177<span></span>
</td>
<td class="nump">$ 22,653,760<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_RestrictedInvestments', window );">Money market investments, restricted</a></td>
<td class="nump">6,000,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text"> <span></span>
</td>
</tr>
<tr class="rou">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents', window );">Total</a></td>
<td class="nump">$ 32,437,424<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 22,653,760<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_CashAndCashEquivalentsAtCarryingValue">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 4<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3044-108585<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section 45<br> -Paragraph 1<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=124098289&amp;loc=d3e6676-107765<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.1)<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_CashAndCashEquivalentsAtCarryingValue</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
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<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
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<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 24<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3521-108585<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 4<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3044-108585<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 50<br> -Paragraph 8<br> -URI http://asc.fasb.org/extlink&amp;oid=123431023&amp;loc=SL98516268-108586<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents</td>
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<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
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<td>xbrli:monetaryItemType</td>
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<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ReceivablesAbstract</td>
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<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
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<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_RestrictedInvestments">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Investments which are not defined as or included in marketable (debt, equity, or other) securities whose use is restricted in whole or in part, generally by contractual agreements or regulatory requirements. For use in an unclassified balance sheet.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 954<br> -SubTopic 210<br> -Section 45<br> -Paragraph 4<br> -URI http://asc.fasb.org/extlink&amp;oid=120413173&amp;loc=SL6242262-115580<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 954<br> -SubTopic 210<br> -Section 50<br> -Paragraph 2<br> -URI http://asc.fasb.org/extlink&amp;oid=120413209&amp;loc=SL6242269-115581<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_RestrictedInvestments</td>
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<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
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<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
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</div>
</body>
</html>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>XML
<SEQUENCE>48
<FILENAME>R38.htm
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
<html>
<head>
<title></title>
<link rel="stylesheet" type="text/css" href="report.css">
<script type="text/javascript" src="Show.js">/* Do Not Remove This Comment */</script><script type="text/javascript">
							function toggleNextSibling (e) {
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<body>
<span style="display: none;">v3.21.2</span><table class="report" border="0" cellspacing="2" id="idm140561368543656">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Restricted Cash (Details Narrative) - USD ($)<br></strong></div></th>
<th class="th" colspan="1">1 Months Ended</th>
<th class="th" colspan="1"></th>
<th class="th" colspan="1"></th>
</tr>
<tr>
<th class="th"><div>Jun. 18, 2021</div></th>
<th class="th"><div>Jun. 30, 2021</div></th>
<th class="th"><div>Jun. 30, 2020</div></th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_srt_DiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReservesLineItems', window );"><strong>Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_RestrictedInvestments', window );">Restricted Investments</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 6,000,000<span></span>
</td>
<td class="text"> <span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_TypeOfArrangementAxis=CLSN_SVBLoanFacilityMember', window );">SVB Loan Facility [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_srt_DiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReservesLineItems', window );"><strong>Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity', window );">Line of Credit Facility, Maximum Borrowing Capacity</a></td>
<td class="nump">$ 10,000,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_LineOfCreditFacilityDescription', window );">Line of Credit Facility, Description</a></td>
<td class="text">the
Company is required at all times to maintain on deposit with SVB as cash collateral in a segregated money market bank account
in the name of the Company, unrestricted and unencumbered cash in an amount of at least 100% of the aggregate outstanding amount of the
SVB loan facility. SVB may restrict withdrawals or transfers by or on behalf of the Company that would violate this requirement.<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=CLSN_SiliconValleyBankMember', window );">Silicon Valley Bank [Member] | SVB Loan Facility [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_srt_DiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReservesLineItems', window );"><strong>Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity', window );">Line of Credit Facility, Maximum Borrowing Capacity</a></td>
<td class="nump">$ 10,000,000<span></span>
</td>
<td class="nump">10,000,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_RestrictedInvestments', window );">Restricted Investments</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 6,000,000.0<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_srt_DiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReservesLineItems">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">srt_DiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReservesLineItems</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>srt_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_LineOfCreditFacilityDescription">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Description of the terms of a credit facility arrangement. Terms typically include interest rate, collateral required, guarantees required, repayment requirements, and restrictions on use of assets and activities of the entity.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.19(b),22(b))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_LineOfCreditFacilityDescription</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.19(b),22(b))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_RestrictedInvestments">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Investments which are not defined as or included in marketable (debt, equity, or other) securities whose use is restricted in whole or in part, generally by contractual agreements or regulatory requirements. For use in an unclassified balance sheet.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 954<br> -SubTopic 210<br> -Section 45<br> -Paragraph 4<br> -URI http://asc.fasb.org/extlink&amp;oid=120413173&amp;loc=SL6242262-115580<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 954<br> -SubTopic 210<br> -Section 50<br> -Paragraph 2<br> -URI http://asc.fasb.org/extlink&amp;oid=120413209&amp;loc=SL6242269-115581<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_RestrictedInvestments</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_TypeOfArrangementAxis=CLSN_SVBLoanFacilityMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_TypeOfArrangementAxis=CLSN_SVBLoanFacilityMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=CLSN_SiliconValleyBankMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=CLSN_SiliconValleyBankMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
</div>
</body>
</html>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>XML
<SEQUENCE>49
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<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
<html>
<head>
<title></title>
<link rel="stylesheet" type="text/css" href="report.css">
<script type="text/javascript" src="Show.js">/* Do Not Remove This Comment */</script><script type="text/javascript">
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</head>
<body>
<span style="display: none;">v3.21.2</span><table class="report" border="0" cellspacing="2" id="idm140561287578712">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Net Loss per Common Share (Details Narrative) - $ / shares<br></strong></div></th>
<th class="th" colspan="2">6 Months Ended</th>
</tr>
<tr>
<th class="th"><div>Jun. 30, 2021</div></th>
<th class="th"><div>Jun. 30, 2020</div></th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_EarningsPerShareAbstract', window );"><strong>Earnings Per Share [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_NumberOfSharesOfCommonStockIssuableUponExerciseOfWarrantsAndEquityAwards', window );">clsn_NumberOfSharesOfCommonStockIssuableUponExerciseOfWarrantsAndEquityAwards</a></td>
<td class="nump">9,325,228<span></span>
</td>
<td class="nump">8,560,124<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1', window );">Class of Warrant or Right, Exercise Price of Warrants or Rights</a></td>
<td class="nump">$ 0.01<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_NumberOfSharesOfCommonStockIssuedInCalculationBasicLossPerShare', window );">Description of Business</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">200,000<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_CLSN_NumberOfSharesOfCommonStockIssuableUponExerciseOfWarrantsAndEquityAwards">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Represents the total number of Shares of common stock issuable upon exercise of warrants and equity awards.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">CLSN_NumberOfSharesOfCommonStockIssuableUponExerciseOfWarrantsAndEquityAwards</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>CLSN_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_CLSN_NumberOfSharesOfCommonStockIssuedInCalculationBasicLossPerShare">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Number of shares of common stock issued in calculation basic loss per share.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">CLSN_NumberOfSharesOfCommonStockIssuedInCalculationBasicLossPerShare</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>CLSN_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Exercise price per share or per unit of warrants or rights outstanding.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section 50<br> -Paragraph 3<br> -URI http://asc.fasb.org/extlink&amp;oid=123467817&amp;loc=d3e21475-112644<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dtr-types:perShareItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_EarningsPerShareAbstract">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_EarningsPerShareAbstract</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
</div>
</body>
</html>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>XML
<SEQUENCE>50
<FILENAME>R40.htm
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
<html>
<head>
<title></title>
<link rel="stylesheet" type="text/css" href="report.css">
<script type="text/javascript" src="Show.js">/* Do Not Remove This Comment */</script><script type="text/javascript">
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</head>
<body>
<span style="display: none;">v3.21.2</span><table class="report" border="0" cellspacing="2" id="idm140561368370888">
<tr>
<th class="tl" colspan="1" rowspan="1"><div style="width: 200px;"><strong>Schedule of Cost, Fair Value and Maturities of Short Term Investments (Details) - USD ($)<br></strong></div></th>
<th class="th"><div>Jun. 30, 2021</div></th>
<th class="th"><div>Dec. 31, 2020</div></th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_MarketableSecuritiesLineItems', window );"><strong>Marketable Securities [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShortTermInvestments', window );">Short-term investments - Cost</a></td>
<td class="nump">$ 31,927,055<span></span>
</td>
<td class="text"> <span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent', window );">Short-term investments - Fair Value</a></td>
<td class="nump">31,923,285<span></span>
</td>
<td class="text"> <span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingWithinThreeMonthsAmortizedCost', window );">Short-term investment maturities - Within 3 months, cost</a></td>
<td class="nump">2,999,420<span></span>
</td>
<td class="text"> <span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingWithinThreeMonthsFairValue', window );">Short-term investment maturities - Within 3 months, fair value</a></td>
<td class="nump">7,792,785<span></span>
</td>
<td class="text"> <span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingBetweenThreeAndTwelveMonthsAmortizedCost', window );">Short-term investment maturities - Between 3-12 months, cost</a></td>
<td class="nump">28,927,635<span></span>
</td>
<td class="text"> <span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingBetweenThreeAndTwelveMonthsFairValue', window );">Short-term investment maturities - Between 3-12 months, fair value</a></td>
<td class="nump">24,130,500<span></span>
</td>
<td class="text"> <span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_AvailableForSaleDebtSecuritiesAmortizedCostBasisCurrent', window );">Total, cost</a></td>
<td class="nump">31,927,055<span></span>
</td>
<td class="text"> <span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate', window );">Total, fair value</a></td>
<td class="nump">31,923,285<span></span>
</td>
<td class="text"> <span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_FinancialInstrumentAxis=us-gaap_CommercialPaperMember', window );">Commercial Paper [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_MarketableSecuritiesLineItems', window );"><strong>Marketable Securities [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShortTermInvestments', window );">Short-term investments - Cost</a></td>
<td class="nump">7,795,035<span></span>
</td>
<td class="text"> <span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent', window );">Short-term investments - Fair Value</a></td>
<td class="nump">7,792,785<span></span>
</td>
<td class="text"> <span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_FinancialInstrumentAxis=CLSN_GovernmentBackedDebtSecuritiesMember', window );">Government Backed Debt Securities [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_MarketableSecuritiesLineItems', window );"><strong>Marketable Securities [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShortTermInvestments', window );">Short-term investments - Cost</a></td>
<td class="nump">24,132,020<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent', window );">Short-term investments - Fair Value</a></td>
<td class="nump">$ 24,130,500<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_CLSN_AvailableForSaleDebtSecuritiesAmortizedCostBasisCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The current amount of amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">CLSN_AvailableForSaleDebtSecuritiesAmortizedCostBasisCurrent</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>CLSN_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_CLSN_DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingBetweenThreeAndTwelveMonthsAmortizedCost">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in next rolling three to twelve months.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">CLSN_DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingBetweenThreeAndTwelveMonthsAmortizedCost</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>CLSN_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_CLSN_DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingBetweenThreeAndTwelveMonthsFairValue">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in next rolling three to twelve months.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">CLSN_DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingBetweenThreeAndTwelveMonthsFairValue</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>CLSN_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_CLSN_DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingWithinThreeMonthsAmortizedCost">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) with single maturity date and allocated without single maturity date, maturing in next rolling three months.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">CLSN_DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingWithinThreeMonthsAmortizedCost</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>CLSN_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_CLSN_DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingWithinThreeMonthsFairValue">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in next rolling three months.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">CLSN_DebtSecuritiesAvailableforsaleMaturityAllocatedAndSingleMaturityDateRollingWithinThreeMonthsFairValue</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>CLSN_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 942<br> -SubTopic 320<br> -Section 50<br> -Paragraph 3A<br> -URI http://asc.fasb.org/extlink&amp;oid=123599081&amp;loc=SL120269850-112803<br><br>Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 320<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (d)<br> -URI http://asc.fasb.org/extlink&amp;oid=123581744&amp;loc=d3e27161-111563<br><br>Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 320<br> -SubTopic 10<br> -Section 50<br> -Paragraph 3<br> -URI http://asc.fasb.org/extlink&amp;oid=123581744&amp;loc=d3e27198-111563<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), classified as current.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 326<br> -SubTopic 30<br> -Section 45<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=124258926&amp;loc=SL82898722-210454<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 320<br> -SubTopic 10<br> -Section 45<br> -Paragraph 2<br> -URI http://asc.fasb.org/extlink&amp;oid=124260329&amp;loc=d3e26626-111562<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_MarketableSecuritiesLineItems">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_MarketableSecuritiesLineItems</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ShortTermInvestments">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of investments including trading securities, available-for-sale securities, held-to-maturity securities, and short-term investments classified as other and current.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 942<br> -SubTopic 210<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.9-03(4))<br> -URI http://asc.fasb.org/extlink&amp;oid=120398452&amp;loc=d3e534808-122878<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 942<br> -SubTopic 210<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.9-03(5))<br> -URI http://asc.fasb.org/extlink&amp;oid=120398452&amp;loc=d3e534808-122878<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 944<br> -SubTopic 210<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.7-03(a)(1)(g))<br> -URI http://asc.fasb.org/extlink&amp;oid=120400017&amp;loc=d3e572229-122910<br><br>Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(2))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShortTermInvestments</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_FinancialInstrumentAxis=us-gaap_CommercialPaperMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_FinancialInstrumentAxis=us-gaap_CommercialPaperMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
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</div></td></tr>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_FinancialInstrumentAxis=CLSN_GovernmentBackedDebtSecuritiesMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_FinancialInstrumentAxis=CLSN_GovernmentBackedDebtSecuritiesMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
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<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
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</div>
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</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>XML
<SEQUENCE>51
<FILENAME>R41.htm
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
<html>
<head>
<title></title>
<link rel="stylesheet" type="text/css" href="report.css">
<script type="text/javascript" src="Show.js">/* Do Not Remove This Comment */</script><script type="text/javascript">
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<body>
<span style="display: none;">v3.21.2</span><table class="report" border="0" cellspacing="2" id="idm140561284669112">
<tr>
<th class="tl" colspan="1" rowspan="1"><div style="width: 200px;"><strong>Summary of Investment Securities Gross Unrealized Gains (Losses) (Details) - USD ($)<br></strong></div></th>
<th class="th"><div>Jun. 30, 2021</div></th>
<th class="th"><div>Dec. 31, 2020</div></th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract', window );"><strong>Investments, Debt and Equity Securities [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_AvailableForSaleSecuritiesUnrealizedGainsFairValue', window );">Investments with unrealized gains, Fair Value</a></td>
<td class="nump">$ 5,998,980<span></span>
</td>
<td class="text"> <span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_AvailableForSaleSecuritiesUnrealizedHoldingGainsLessThanTwelveMonths', window );">Investments with unrealized gains, Unrealized Holding Gains (Losses)</a></td>
<td class="nump">1,073<span></span>
</td>
<td class="text"> <span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_AvailableForSaleSecuritiesUnrealizedLossFairValue', window );">Investments with unrealized losses, Fair Value</a></td>
<td class="nump">25,924,305<span></span>
</td>
<td class="text"> <span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_AvailableForSaleSecuritiesUnrealizedHoldingLossesLessThanTwelveMonths', window );">Investments with unrealized Losses, Unrealized Holding Gains (Losses)</a></td>
<td class="num">(4,843)<span></span>
</td>
<td class="text"> <span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent', window );">Investment securities, available for sale</a></td>
<td class="nump">31,923,285<span></span>
</td>
<td class="text"> <span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_AvailableForSaleSecuritiesUnrealizedHoldingGainsLossesLessThanTwelveMonths', window );">Investments with unrealized Gains (Losses), Unrealized Holding Gains (Losses)</a></td>
<td class="num">$ (3,770)<span></span>
</td>
<td class="text"> <span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_CLSN_AvailableForSaleSecuritiesUnrealizedGainsFairValue">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Available for sale securities unrealized gains fair value.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">CLSN_AvailableForSaleSecuritiesUnrealizedGainsFairValue</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>CLSN_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_CLSN_AvailableForSaleSecuritiesUnrealizedHoldingGainsLessThanTwelveMonths">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Available for sale securities unrealized gains less than twelve months.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">CLSN_AvailableForSaleSecuritiesUnrealizedHoldingGainsLessThanTwelveMonths</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>CLSN_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_CLSN_AvailableForSaleSecuritiesUnrealizedHoldingGainsLossesLessThanTwelveMonths">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Available for sale securities unrealized gains (losses) less than twelve months.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">CLSN_AvailableForSaleSecuritiesUnrealizedHoldingGainsLossesLessThanTwelveMonths</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>CLSN_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
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<td><strong> Balance Type:</strong></td>
<td>credit</td>
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<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_CLSN_AvailableForSaleSecuritiesUnrealizedHoldingLossesLessThanTwelveMonths">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Available for sale securities unrealized losses less than twelve months.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">CLSN_AvailableForSaleSecuritiesUnrealizedHoldingLossesLessThanTwelveMonths</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>CLSN_</td>
</tr>
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<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_CLSN_AvailableForSaleSecuritiesUnrealizedLossFairValue">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Available for sale securities unrealized losses fair value.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">CLSN_AvailableForSaleSecuritiesUnrealizedLossFairValue</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>CLSN_</td>
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<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), classified as current.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 326<br> -SubTopic 30<br> -Section 45<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=124258926&amp;loc=SL82898722-210454<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 320<br> -SubTopic 10<br> -Section 45<br> -Paragraph 2<br> -URI http://asc.fasb.org/extlink&amp;oid=124260329&amp;loc=d3e26626-111562<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract</td>
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<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
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<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
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<td><strong> Balance Type:</strong></td>
<td>na</td>
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<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
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</div>
</body>
</html>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>XML
<SEQUENCE>52
<FILENAME>R42.htm
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
<html>
<head>
<title></title>
<link rel="stylesheet" type="text/css" href="report.css">
<script type="text/javascript" src="Show.js">/* Do Not Remove This Comment */</script><script type="text/javascript">
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<body>
<span style="display: none;">v3.21.2</span><table class="report" border="0" cellspacing="2" id="idm140561368429640">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Summary of Net Realized Losses on Sales of Available for Sale Securities and Investment Income Interest and Dividends (Details) - USD ($)<br></strong></div></th>
<th class="th" colspan="2">3 Months Ended</th>
<th class="th" colspan="2">6 Months Ended</th>
</tr>
<tr>
<th class="th"><div>Jun. 30, 2021</div></th>
<th class="th"><div>Jun. 30, 2020</div></th>
<th class="th"><div>Jun. 30, 2021</div></th>
<th class="th"><div>Jun. 30, 2020</div></th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract', window );"><strong>Investments, Debt and Equity Securities [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_InvestmentIncomeInterestAndDividend', window );">Interest and dividends accrued and paid</a></td>
<td class="nump">$ 1,436<span></span>
</td>
<td class="nump">$ 18,095<span></span>
</td>
<td class="nump">$ 3,847<span></span>
</td>
<td class="nump">$ 63,172<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet', window );">Realized (losses) gains</a></td>
<td class="num">(1,785)<span></span>
</td>
<td class="nump">2,865<span></span>
</td>
<td class="num">(1,785)<span></span>
</td>
<td class="nump">46,097<span></span>
</td>
</tr>
<tr class="rou">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_InvestmentIncomeLossNonoperating', window );">Investment (loss) income, net</a></td>
<td class="num">$ (349)<span></span>
</td>
<td class="nump">$ 20,960<span></span>
</td>
<td class="nump">$ 2,062<span></span>
</td>
<td class="nump">$ 109,269<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_CLSN_InvestmentIncomeLossNonoperating">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">CLSN_InvestmentIncomeLossNonoperating</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>CLSN_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_InvestmentIncomeInterestAndDividend">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount before accretion (amortization) of purchase discount (premium) of interest income and dividend income on nonoperating securities.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 220<br> -SubTopic 10<br> -Section S99<br> -Paragraph 2<br> -Subparagraph (SX 210.5-03.7(a),(b))<br> -URI http://asc.fasb.org/extlink&amp;oid=123367319&amp;loc=SL114868664-224227<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
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<span style="display: none;">v3.21.2</span><table class="report" border="0" cellspacing="2" id="idm140561376035176">
<tr>
<th class="tl" colspan="1" rowspan="1"><div style="width: 200px;"><strong>Investment in Debt Securities Available for Sale (Details Narrative) - USD ($)<br></strong></div></th>
<th class="th"><div>Jun. 30, 2021</div></th>
<th class="th"><div>Dec. 31, 2020</div></th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract', window );"><strong>Investments, Debt and Equity Securities [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent', window );">Investment in debt securities - available for sale, at fair value</a></td>
<td class="nump">$ 31,923,285<span></span>
</td>
<td class="text"> <span></span>
</td>
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<div style="display: none;">
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), classified as current.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 326<br> -SubTopic 30<br> -Section 45<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=124258926&amp;loc=SL82898722-210454<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 320<br> -SubTopic 10<br> -Section 45<br> -Paragraph 2<br> -URI http://asc.fasb.org/extlink&amp;oid=124260329&amp;loc=d3e26626-111562<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
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<td><strong> Data Type:</strong></td>
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<td><strong> Balance Type:</strong></td>
<td>debit</td>
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<td><strong> Period Type:</strong></td>
<td>instant</td>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
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<td>na</td>
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<TYPE>XML
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<TEXT>
<html>
<head>
<title></title>
<link rel="stylesheet" type="text/css" href="report.css">
<script type="text/javascript" src="Show.js">/* Do Not Remove This Comment */</script><script type="text/javascript">
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<span style="display: none;">v3.21.2</span><table class="report" border="0" cellspacing="2" id="idm140561388935096">
<tr>
<th class="tl" colspan="1" rowspan="1"><div style="width: 200px;"><strong>Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis (Details) - USD ($)<br></strong></div></th>
<th class="th"><div>Jun. 30, 2021</div></th>
<th class="th"><div>Dec. 31, 2020</div></th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareLineItems', window );"><strong>Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent', window );">Investment securities, available for sale</a></td>
<td class="nump">$ 31,923,285<span></span>
</td>
<td class="text"> <span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent', window );">Earn-out milestone liability</a></td>
<td class="nump">7,088,000<span></span>
</td>
<td class="nump">7,018,000<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsRecurringMember', window );">Fair Value, Recurring [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareLineItems', window );"><strong>Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent', window );">Earn-out milestone liability</a></td>
<td class="nump">7,088,000<span></span>
</td>
<td class="nump">7,018,000<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsRecurringMember', window );">Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareLineItems', window );"><strong>Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent', window );">Earn-out milestone liability</a></td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsRecurringMember', window );">Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareLineItems', window );"><strong>Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent', window );">Earn-out milestone liability</a></td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsRecurringMember', window );">Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareLineItems', window );"><strong>Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent', window );">Earn-out milestone liability</a></td>
<td class="nump">7,088,000<span></span>
</td>
<td class="nump">7,018,000<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsRecurringMember', window );">Fair Value, Recurring [Member] | Corporate Debt Securities [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareLineItems', window );"><strong>Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent', window );">Investment securities, available for sale</a></td>
<td class="nump">31,923,285<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsRecurringMember', window );">Fair Value, Recurring [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareLineItems', window );"><strong>Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent', window );">Investment securities, available for sale</a></td>
<td class="text"> <span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsRecurringMember', window );">Fair Value, Recurring [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareLineItems', window );"><strong>Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent', window );">Investment securities, available for sale</a></td>
<td class="nump">31,923,285<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsRecurringMember', window );">Fair Value, Recurring [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareLineItems', window );"><strong>Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent', window );">Investment securities, available for sale</a></td>
<td class="text"> <span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsNonrecurringMember', window );">Fair Value, Nonrecurring [Member] | Inprocess R&amp;D [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareLineItems', window );"><strong>Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent', window );">Investment securities, available for sale</a></td>
<td class="nump">13,366,234<span></span>
</td>
<td class="nump">13,366,234<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsNonrecurringMember', window );">Fair Value, Nonrecurring [Member] | Inprocess R&amp;D [Member] | Fair Value, Inputs, Level 1 [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareLineItems', window );"><strong>Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent', window );">Investment securities, available for sale</a></td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsNonrecurringMember', window );">Fair Value, Nonrecurring [Member] | Inprocess R&amp;D [Member] | Fair Value, Inputs, Level 2 [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareLineItems', window );"><strong>Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent', window );">Investment securities, available for sale</a></td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsNonrecurringMember', window );">Fair Value, Nonrecurring [Member] | Inprocess R&amp;D [Member] | Fair Value, Inputs, Level 3 [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareLineItems', window );"><strong>Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent', window );">Investment securities, available for sale</a></td>
<td class="nump">$ 13,366,234<span></span>
</td>
<td class="nump">$ 13,366,234<span></span>
</td>
</tr>
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<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), classified as current.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 326<br> -SubTopic 30<br> -Section 45<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=124258926&amp;loc=SL82898722-210454<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 320<br> -SubTopic 10<br> -Section 45<br> -Paragraph 2<br> -URI http://asc.fasb.org/extlink&amp;oid=124260329&amp;loc=d3e26626-111562<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent</td>
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<tr>
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</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
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<tr>
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<td>instant</td>
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</table></div>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of liability recognized arising from contingent consideration in a business combination, expected to be settled beyond one year or the normal operating cycle, if longer.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 805<br> -SubTopic 30<br> -Section 25<br> -Paragraph 6<br> -URI http://asc.fasb.org/extlink&amp;oid=6911189&amp;loc=d3e6408-128476<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 805<br> -SubTopic 30<br> -Section 35<br> -Paragraph 1<br> -Subparagraph b<br> -URI http://asc.fasb.org/extlink&amp;oid=116859824&amp;loc=d3e6819-128478<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent</td>
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<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
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<td><strong> Balance Type:</strong></td>
<td>credit</td>
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<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
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</table></div>
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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareLineItems</td>
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<td><strong> Balance Type:</strong></td>
<td>na</td>
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<td>duration</td>
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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
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<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_FinancialInstrumentAxis=us-gaap_CorporateDebtSecuritiesMember</td>
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<td>na</td>
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<td><strong> Balance Type:</strong></td>
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<td><strong> Period Type:</strong></td>
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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
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<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsNonrecurringMember</td>
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<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_FinancialInstrumentAxis=CLSN_InprocessRandDMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_FinancialInstrumentAxis=CLSN_InprocessRandDMember</td>
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<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
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<td>na</td>
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<head>
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<span style="display: none;">v3.21.2</span><table class="report" border="0" cellspacing="2" id="idm140561288149816">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Schedule of Fair Value of Assets Acquired (Details)<br></strong></div></th>
<th class="th" colspan="1">6 Months Ended</th>
</tr>
<tr><th class="th">
<div>Jun. 30, 2021 </div>
<div>USD ($)</div>
</th></tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_FiniteLivedIntangibleAssetsLineItems', window );"><strong>Finite-Lived Intangible Assets [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_FiniteLivedIntangibleAssetsNet', window );">Intangible assets, beginning balance</a></td>
<td class="nump">$ 113,660<span></span>
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<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_FiniteLivedIntangibleAssetsNet', window );">Intangible assets, ending balance</a></td>
<td class="text"> <span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_NoncompeteAgreementsMember', window );">Noncompete Agreements [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_FiniteLivedIntangibleAssetsLineItems', window );"><strong>Finite-Lived Intangible Assets [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_FiniteLivedIntangibleAssetsNet', window );">Intangible assets, beginning balance</a></td>
<td class="nump">113,660<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AmortizationOfIntangibleAssets', window );">Amortization</a></td>
<td class="num">(113,660)<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_FiniteLivedIntangibleAssetsNet', window );">Intangible assets, ending balance</a></td>
<td class="text"> <span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_FairValueByAssetClassAxis=CLSN_IPRAndDMember', window );">IPR&amp;D [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_FiniteLivedIntangibleAssetsLineItems', window );"><strong>Finite-Lived Intangible Assets [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_FiniteLivedIntangibleAssetsNet', window );">Intangible assets, beginning balance</a></td>
<td class="nump">13,366,234<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AmortizationOfIntangibleAssets', window );">Amortization</a></td>
<td class="text"> <span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_FiniteLivedIntangibleAssetsNet', window );">Intangible assets, ending balance</a></td>
<td class="nump">13,366,234<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_FairValueByAssetClassAxis=us-gaap_GoodwillMember', window );">Goodwill [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_FiniteLivedIntangibleAssetsLineItems', window );"><strong>Finite-Lived Intangible Assets [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_FiniteLivedIntangibleAssetsNet', window );">Intangible assets, beginning balance</a></td>
<td class="nump">1,976,101<span></span>
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<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AmortizationOfIntangibleAssets', window );">Amortization</a></td>
<td class="text"> <span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_FiniteLivedIntangibleAssetsNet', window );">Intangible assets, ending balance</a></td>
<td class="nump">$ 1,976,101<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_AmortizationOfIntangibleAssets">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 28<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3602-108585<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 350<br> -SubTopic 30<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (a)(2)<br> -URI http://asc.fasb.org/extlink&amp;oid=66006027&amp;loc=d3e16323-109275<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 350<br> -SubTopic 30<br> -Section 45<br> -Paragraph 2<br> -URI http://asc.fasb.org/extlink&amp;oid=6388964&amp;loc=d3e16225-109274<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AmortizationOfIntangibleAssets</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
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<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
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<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
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<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
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</table></div>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_FiniteLivedIntangibleAssetsLineItems">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_FiniteLivedIntangibleAssetsLineItems</td>
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<td><strong> Data Type:</strong></td>
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<td>na</td>
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<td><strong> Period Type:</strong></td>
<td>duration</td>
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</table></div>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_FiniteLivedIntangibleAssetsNet">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 926<br> -SubTopic 20<br> -Section 50<br> -Paragraph 5<br> -URI http://asc.fasb.org/extlink&amp;oid=120154696&amp;loc=d3e54445-107959<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 350<br> -SubTopic 30<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (a)(1)<br> -URI http://asc.fasb.org/extlink&amp;oid=66006027&amp;loc=d3e16323-109275<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_FiniteLivedIntangibleAssetsNet</td>
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<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
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<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
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<td><strong> Balance Type:</strong></td>
<td>debit</td>
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<td>instant</td>
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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
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<tr>
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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
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<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
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<td>na</td>
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<td></td>
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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
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<td></td>
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<td>na</td>
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<td></td>
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<span style="display: none;">v3.21.2</span><table class="report" border="0" cellspacing="2" id="idm140561283585048">
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<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Intangible Assets (Details Narrative) - USD ($)<br></strong></div></th>
<th class="th" colspan="1"></th>
<th class="th" colspan="1">3 Months Ended</th>
<th class="th" colspan="2">6 Months Ended</th>
<th class="th" colspan="2">12 Months Ended</th>
<th class="th" colspan="1"></th>
</tr>
<tr>
<th class="th"><div>Sep. 30, 2020</div></th>
<th class="th"><div>Sep. 30, 2020</div></th>
<th class="th"><div>Jun. 30, 2021</div></th>
<th class="th"><div>Jun. 30, 2020</div></th>
<th class="th"><div>Dec. 31, 2019</div></th>
<th class="th"><div>Dec. 31, 2018</div></th>
<th class="th"><div>Dec. 31, 2020</div></th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AcquiredIndefiniteLivedIntangibleAssetsLineItems', window );"><strong>Acquired Indefinite-lived Intangible Assets [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_FiniteLivedIntangibleAssetsNet', window );">Finite-Lived Intangible Assets, Net</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 113,660<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_TypeOfArrangementAxis=CLSN_AspirePurchaseAgreementsMember', window );">2018 Aspire Purchase Agreements [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AcquiredIndefiniteLivedIntangibleAssetsLineItems', window );"><strong>Acquired Indefinite-lived Intangible Assets [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_FiniteLivedIntangibleAssetsNet', window );">Finite-Lived Intangible Assets, Net</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">113,660<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization', window );">Finite-Lived Intangible Assets, Accumulated Amortization</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 1,477,554<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ContingentConsiderationByTypeAxis=CLSN_GlioblastomaMultiformeBrainCancerMember', window );">Glioblastoma Multiforme Brain Cancer [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AcquiredIndefiniteLivedIntangibleAssetsLineItems', window );"><strong>Acquired Indefinite-lived Intangible Assets [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AssetImpairmentCharges', window );">Asset Impairment Charges</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 2,400,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_LegalEntityAxis=CLSN_IPRAndDDrugTechnologyPlatformsMember', window );">Glioblastoma Multiforme Brain Cancer [Member] | Ovarian Cancer [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AcquiredIndefiniteLivedIntangibleAssetsLineItems', window );"><strong>Acquired Indefinite-lived Intangible Assets [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_FinitelivedIntangibleAssetsAcquired1', window );">Finite-lived Intangible Assets Acquired</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">13,300,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_BusinessAcquisitionAxis=CLSN_EGENIncMember', window );">EGEN Inc [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AcquiredIndefiniteLivedIntangibleAssetsLineItems', window );"><strong>Acquired Indefinite-lived Intangible Assets [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AssetImpairmentCharges', window );">Asset Impairment Charges</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 7,000,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_GoodwillAcquiredDuringPeriod', window );">Goodwill, Acquired During Period</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">2,000,000.0<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_BusinessAcquisitionAxis=CLSN_EGENIncMember', window );">EGEN Inc [Member] | Purchase Agreement [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AcquiredIndefiniteLivedIntangibleAssetsLineItems', window );"><strong>Acquired Indefinite-lived Intangible Assets [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_FinitelivedIntangibleAssetsAcquired1', window );">Finite-lived Intangible Assets Acquired</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 1,600,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_FiniteLivedIntangibleAssetUsefulLife', window );">Finite-Lived Intangible Asset, Useful Life</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">7 years<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AdjustmentForAmortization', window );">Amortization</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 56,830<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_BusinessAcquisitionAxis=CLSN_EGENIncMember', window );">EGEN Inc [Member] | Glioblastoma Multiforme Brain Cancer [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AcquiredIndefiniteLivedIntangibleAssetsLineItems', window );"><strong>Acquired Indefinite-lived Intangible Assets [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AssetImpairmentCharges', window );">Asset Impairment Charges</a></td>
<td class="nump">$ 2,400,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 9,400,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_NoncashCharge', window );">[custom:NoncashCharge]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 2,400,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_BusinessAcquisitionAxis=CLSN_EGENIncMember', window );">EGEN Inc [Member] | Glioblastoma Multiforme Brain Cancer [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AcquiredIndefiniteLivedIntangibleAssetsLineItems', window );"><strong>Acquired Indefinite-lived Intangible Assets [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_IndefinitelivedIntangibleAssetsAcquired', window );">Indefinite-lived Intangible Assets Acquired</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 24,200,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_CLSN_NoncashCharge">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Non-cash charge.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">CLSN_NoncashCharge</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>CLSN_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_AcquiredIndefiniteLivedIntangibleAssetsLineItems">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AcquiredIndefiniteLivedIntangibleAssetsLineItems</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_AdjustmentForAmortization">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The aggregate amount of recurring noncash expense charged against earnings in the period to allocate the cost of assets over their estimated remaining economic lives.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 350<br> -SubTopic 30<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (a)(2)<br> -URI http://asc.fasb.org/extlink&amp;oid=66006027&amp;loc=d3e16323-109275<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 28<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3602-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AdjustmentForAmortization</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_AssetImpairmentCharges">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 28<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3602-108585<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 360<br> -SubTopic 10<br> -Section 45<br> -Paragraph 4<br> -URI http://asc.fasb.org/extlink&amp;oid=123351718&amp;loc=d3e2420-110228<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AssetImpairmentCharges</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_FiniteLivedIntangibleAssetUsefulLife">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_FiniteLivedIntangibleAssetUsefulLife</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:durationItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 350<br> -SubTopic 30<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (a)(1)<br> -URI http://asc.fasb.org/extlink&amp;oid=66006027&amp;loc=d3e16323-109275<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_FiniteLivedIntangibleAssetsNet">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 926<br> -SubTopic 20<br> -Section 50<br> -Paragraph 5<br> -URI http://asc.fasb.org/extlink&amp;oid=120154696&amp;loc=d3e54445-107959<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 350<br> -SubTopic 30<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (a)(1)<br> -URI http://asc.fasb.org/extlink&amp;oid=66006027&amp;loc=d3e16323-109275<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_FiniteLivedIntangibleAssetsNet</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_FinitelivedIntangibleAssetsAcquired1">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 350<br> -SubTopic 30<br> -Section 50<br> -Paragraph 1<br> -Subparagraph (a)(1)<br> -URI http://asc.fasb.org/extlink&amp;oid=66006027&amp;loc=d3e16265-109275<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_FinitelivedIntangibleAssetsAcquired1</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_GoodwillAcquiredDuringPeriod">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 350<br> -SubTopic 20<br> -Section 50<br> -Paragraph 1<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=121556970&amp;loc=d3e13816-109267<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_GoodwillAcquiredDuringPeriod</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_IndefinitelivedIntangibleAssetsAcquired">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of increase in assets, excluding financial assets and goodwill, lacking physical substance with an indefinite life, from an acquisition.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_IndefinitelivedIntangibleAssetsAcquired</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_TypeOfArrangementAxis=CLSN_AspirePurchaseAgreementsMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_TypeOfArrangementAxis=CLSN_AspirePurchaseAgreementsMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
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<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ContingentConsiderationByTypeAxis=CLSN_GlioblastomaMultiformeBrainCancerMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ContingentConsiderationByTypeAxis=CLSN_GlioblastomaMultiformeBrainCancerMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_LegalEntityAxis=CLSN_IPRAndDDrugTechnologyPlatformsMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_LegalEntityAxis=CLSN_IPRAndDDrugTechnologyPlatformsMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ContingentConsiderationByTypeAxis=CLSN_OvarianCancerMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ContingentConsiderationByTypeAxis=CLSN_OvarianCancerMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_BusinessAcquisitionAxis=CLSN_EGENIncMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_BusinessAcquisitionAxis=CLSN_EGENIncMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_TypeOfArrangementAxis=CLSN_PurchaseAgreementMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_TypeOfArrangementAxis=CLSN_PurchaseAgreementMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
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<DESCRIPTION>IDEA: XBRL DOCUMENT
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<head>
<title></title>
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<span style="display: none;">v3.21.2</span><table class="report" border="0" cellspacing="2" id="idm140561283888488">
<tr>
<th class="tl" colspan="1" rowspan="1"><div style="width: 200px;"><strong>Schedule of Accrued Liabilities (Details) - USD ($)<br></strong></div></th>
<th class="th"><div>Jun. 30, 2021</div></th>
<th class="th"><div>Dec. 31, 2020</div></th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PayablesAndAccrualsAbstract', window );"><strong>Payables and Accruals [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ContractualObligation', window );">Amounts due to contract research organizations and other contractual agreements</a></td>
<td class="nump">$ 1,189,017<span></span>
</td>
<td class="nump">$ 636,000<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_EmployeeRelatedLiabilitiesCurrent', window );">Accrued payroll and related benefits</a></td>
<td class="nump">1,016,610<span></span>
</td>
<td class="nump">1,736,271<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AccruedProfessionalFeesCurrent', window );">Accrued professional fees</a></td>
<td class="nump">80,625<span></span>
</td>
<td class="nump">66,850<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_InterestPayableCurrent', window );">Accrued interest</a></td>
<td class="nump">7,042<span></span>
</td>
<td class="text"> <span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OtherAccruedLiabilitiesCurrent', window );">Other</a></td>
<td class="nump">19,411<span></span>
</td>
<td class="nump">19,411<span></span>
</td>
</tr>
<tr class="reu">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AccruedLiabilitiesCurrent', window );">Total</a></td>
<td class="nump">$ 2,312,705<span></span>
</td>
<td class="nump">$ 2,458,532<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_AccruedLiabilitiesCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.20)<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AccruedLiabilitiesCurrent</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_AccruedProfessionalFeesCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Carrying value as of the balance sheet date of obligations incurred through that date and payable for professional fees, such as for legal and accounting services received. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section 45<br> -Paragraph 6<br> -URI http://asc.fasb.org/extlink&amp;oid=124098289&amp;loc=d3e6911-107765<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.20)<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section 45<br> -Paragraph 8<br> -URI http://asc.fasb.org/extlink&amp;oid=124098289&amp;loc=d3e6935-107765<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AccruedProfessionalFeesCurrent</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ContractualObligation">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ContractualObligation</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_EmployeeRelatedLiabilitiesCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Total of the carrying values as of the balance sheet date of obligations incurred through that date and payable for obligations related to services received from employees, such as accrued salaries and bonuses, payroll taxes and fringe benefits. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.20)<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_EmployeeRelatedLiabilitiesCurrent</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_InterestPayableCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Carrying value as of the balance sheet date of [accrued] interest payable on all forms of debt, including trade payables, that has been incurred and is unpaid. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section 45<br> -Paragraph 9<br> -URI http://asc.fasb.org/extlink&amp;oid=124098289&amp;loc=d3e7018-107765<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section 45<br> -Paragraph 8<br> -URI http://asc.fasb.org/extlink&amp;oid=124098289&amp;loc=d3e6935-107765<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.20)<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_InterestPayableCurrent</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_OtherAccruedLiabilitiesCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of expenses incurred but not yet paid classified as other, due within one year or the normal operating cycle, if longer.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.20)<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section 45<br> -Paragraph 6<br> -URI http://asc.fasb.org/extlink&amp;oid=124098289&amp;loc=d3e6911-107765<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section 45<br> -Paragraph 9<br> -URI http://asc.fasb.org/extlink&amp;oid=124098289&amp;loc=d3e7018-107765<br><br>Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section 45<br> -Paragraph 8<br> -URI http://asc.fasb.org/extlink&amp;oid=124098289&amp;loc=d3e6935-107765<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
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<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_PayablesAndAccrualsAbstract</td>
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<span style="display: none;">v3.21.2</span><table class="report" border="0" cellspacing="2" id="idm140561284541080">
<tr>
<th class="tl" colspan="1" rowspan="1"><div style="width: 200px;"><strong>Schedule of Future Principle Payments, Net of Unamortized Debt Discounts (Details)<br></strong></div></th>
<th class="th">
<div>Jun. 30, 2021 </div>
<div>USD ($)</div>
</th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_DebtDisclosureAbstract', window );"><strong>Debt Disclosure [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths', window );">2022</a></td>
<td class="text"> <span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo', window );">2023</a></td>
<td class="text"> <span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree', window );">2024</a></td>
<td class="nump">3,000,000<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_LongTermDebtMaturitiesRepaymentsOfPrincipalYearFourAndThereAfter', window );">2025 and thereafter</a></td>
<td class="nump">3,000,000<span></span>
</td>
</tr>
<tr class="rou">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_DebtInstrumentCarryingAmount', window );">Subtotal of future principal payments</a></td>
<td class="nump">6,000,000<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_DeferredFinanceCostsNet', window );">Unamortized debt premium, net</a></td>
<td class="num">(236,913)<span></span>
</td>
</tr>
<tr class="rou">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_LongTermDebt', window );">Total</a></td>
<td class="nump">$ 5,763,087<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_CLSN_LongTermDebtMaturitiesRepaymentsOfPrincipalYearFourAndThereAfter">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Long Term Debt Maturities Repayments Of Principal Year Four And There After.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">CLSN_LongTermDebtMaturitiesRepaymentsOfPrincipalYearFourAndThereAfter</td>
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<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
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<td><strong> Period Type:</strong></td>
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</table></div>
</div></td></tr>
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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_DebtDisclosureAbstract</td>
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<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
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<td>xbrli:stringItemType</td>
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<td><strong> Balance Type:</strong></td>
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<td><strong> Period Type:</strong></td>
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</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_DebtInstrumentCarryingAmount">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 20<br> -Section 50<br> -Paragraph 4<br> -Subparagraph (b)(1)<br> -URI http://asc.fasb.org/extlink&amp;oid=123466204&amp;loc=SL6031897-161870<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 944<br> -SubTopic 210<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.7-03(16))<br> -URI http://asc.fasb.org/extlink&amp;oid=120400017&amp;loc=d3e572229-122910<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(22))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 942<br> -SubTopic 210<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.9-03(16))<br> -URI http://asc.fasb.org/extlink&amp;oid=120398452&amp;loc=d3e534808-122878<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_DebtInstrumentCarryingAmount</td>
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<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
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<td>credit</td>
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<td><strong> Period Type:</strong></td>
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</tr>
</table></div>
</div></td></tr>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_DeferredFinanceCostsNet">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.17)<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 20<br> -Section 50<br> -Paragraph 1D<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=123466505&amp;loc=SL123495340-112611<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 835<br> -SubTopic 30<br> -Section 45<br> -Paragraph 3<br> -URI http://asc.fasb.org/extlink&amp;oid=124435984&amp;loc=d3e28555-108399<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_DeferredFinanceCostsNet</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
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<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 20<br> -Section 50<br> -Paragraph 4<br> -Subparagraph (b)(3)<br> -URI http://asc.fasb.org/extlink&amp;oid=123466204&amp;loc=SL6031897-161870<br><br>Reference 2: http://www.xbrl.org/2003/role/exampleRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 20<br> -Section 55<br> -Paragraph 69C<br> -URI http://asc.fasb.org/extlink&amp;oid=123466577&amp;loc=SL123495737-112612<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 944<br> -SubTopic 210<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.7-03(a)(16))<br> -URI http://asc.fasb.org/extlink&amp;oid=120400017&amp;loc=d3e572229-122910<br><br>Reference 4: http://www.xbrl.org/2003/role/exampleRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 20<br> -Section 55<br> -Paragraph 69B<br> -URI http://asc.fasb.org/extlink&amp;oid=123466577&amp;loc=SL123495735-112612<br><br>Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 942<br> -SubTopic 210<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.9-03(16))<br> -URI http://asc.fasb.org/extlink&amp;oid=120398452&amp;loc=d3e534808-122878<br><br>Reference 6: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 20<br> -Section 50<br> -Paragraph 1D<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=123466505&amp;loc=SL123495340-112611<br><br>Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(22))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_LongTermDebt</td>
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<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
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<td><strong> Data Type:</strong></td>
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<td><strong> Balance Type:</strong></td>
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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 20<br> -Section 50<br> -Paragraph 1E<br> -Subparagraph (d)<br> -URI http://asc.fasb.org/extlink&amp;oid=123466505&amp;loc=SL123495348-112611<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 235<br> -SubTopic 10<br> -Section S99<br> -Paragraph 3<br> -Subparagraph (SX 210.12-04(a))<br> -URI http://asc.fasb.org/extlink&amp;oid=120395691&amp;loc=d3e24072-122690<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 10<br> -Section 50<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=123465755&amp;loc=d3e1835-112601<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths</td>
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<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
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<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
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<td><strong> Balance Type:</strong></td>
<td>credit</td>
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<td><strong> Period Type:</strong></td>
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</tr>
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</div></td></tr>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 20<br> -Section 50<br> -Paragraph 1E<br> -Subparagraph (d)<br> -URI http://asc.fasb.org/extlink&amp;oid=123466505&amp;loc=SL123495348-112611<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 235<br> -SubTopic 10<br> -Section S99<br> -Paragraph 3<br> -Subparagraph (SX 210.12-04(a))<br> -URI http://asc.fasb.org/extlink&amp;oid=120395691&amp;loc=d3e24072-122690<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 10<br> -Section 50<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=123465755&amp;loc=d3e1835-112601<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 20<br> -Section 50<br> -Paragraph 1E<br> -Subparagraph (d)<br> -URI http://asc.fasb.org/extlink&amp;oid=123466505&amp;loc=SL123495348-112611<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 235<br> -SubTopic 10<br> -Section S99<br> -Paragraph 3<br> -Subparagraph (SX 210.12-04(a))<br> -URI http://asc.fasb.org/extlink&amp;oid=120395691&amp;loc=d3e24072-122690<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 10<br> -Section 50<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=123465755&amp;loc=d3e1835-112601<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
</div>
</body>
</html>
</TEXT>
</DOCUMENT>
<DOCUMENT>
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<head>
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<span style="display: none;">v3.21.2</span><table class="report" border="0" cellspacing="2" id="idm140561282842504">
<tr>
<th class="tl" colspan="1" rowspan="1"><div style="width: 200px;"><strong>Schedule of Debt (Details) - Horizon Technology Finance Corporation [Member]<br></strong></div></th>
<th class="th">
<div>Jun. 30, 2021 </div>
<div>USD ($)</div>
</th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityListingsLineItems', window );"><strong>Entity Listings [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_LineOfCredit', window );">Line of credit, beginning balance</a></td>
<td class="nump">$ 5,000,000<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_EarlyTerminationFees', window );">Early termination fees</a></td>
<td class="nump">150,000<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_EndOfTermFees', window );">End of term charges</a></td>
<td class="nump">275,000<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_LineOfCredit', window );">Line of credit, ending balance</a></td>
<td class="nump">$ 5,425,000<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_CLSN_EarlyTerminationFees">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Early termination fees.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">CLSN_EarlyTerminationFees</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>CLSN_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_CLSN_EndOfTermFees">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>End of term fees.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">CLSN_EndOfTermFees</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>CLSN_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityListingsLineItems">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityListingsLineItems</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_LineOfCredit">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(22))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 942<br> -SubTopic 210<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.9-03(16))<br> -URI http://asc.fasb.org/extlink&amp;oid=120398452&amp;loc=d3e534808-122878<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 944<br> -SubTopic 210<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.7-03(16))<br> -URI http://asc.fasb.org/extlink&amp;oid=120400017&amp;loc=d3e572229-122910<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_LineOfCredit</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_LegalEntityAxis=CLSN_HorizonTechnologyFinanceCorporationMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_LegalEntityAxis=CLSN_HorizonTechnologyFinanceCorporationMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
</div>
</body>
</html>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>XML
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<TEXT>
<html>
<head>
<title></title>
<link rel="stylesheet" type="text/css" href="report.css">
<script type="text/javascript" src="Show.js">/* Do Not Remove This Comment */</script><script type="text/javascript">
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<span style="display: none;">v3.21.2</span><table class="report" border="0" cellspacing="2" id="idm140561279835224">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Notes (Details Narrative) - USD ($)<br></strong></div></th>
<th class="th" colspan="1"></th>
<th class="th" colspan="1"></th>
<th class="th" colspan="1"></th>
<th class="th" colspan="1">1 Months Ended</th>
<th class="th" colspan="2">3 Months Ended</th>
<th class="th" colspan="2">6 Months Ended</th>
</tr>
<tr>
<th class="th"><div>Jun. 30, 2021</div></th>
<th class="th"><div>Aug. 28, 2020</div></th>
<th class="th"><div>Jun. 27, 2018</div></th>
<th class="th"><div>Jun. 18, 2021</div></th>
<th class="th"><div>Jun. 30, 2021</div></th>
<th class="th"><div>Jun. 30, 2020</div></th>
<th class="th"><div>Jun. 30, 2021</div></th>
<th class="th"><div>Jun. 30, 2020</div></th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShortTermDebtLineItems', window );"><strong>Short-term Debt [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_InterestAndDebtExpense', window );">Interest and Debt Expense</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 221,227<span></span>
</td>
<td class="nump">$ 340,602<span></span>
</td>
<td class="nump">$ 378,841<span></span>
</td>
<td class="nump">$ 679,967<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_DeferredFinanceCostsNet', window );">Debt Issuance Costs, Net</a></td>
<td class="nump">$ 236,913<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 236,913<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 236,913<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1', window );">Class of Warrant or Right, Exercise Price of Warrants or Rights</a></td>
<td class="nump">$ 0.01<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 0.01<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 0.01<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_DebtInstrumentAxis=CLSN_InitialHorizonCreditAgreementAmendmentMember', window );">Initial Horizon Credit Agreement Amendment [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShortTermDebtLineItems', window );"><strong>Short-term Debt [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AmortizationOfFinancingCosts', window );">Amortization of Debt Issuance Costs</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 102,126<span></span>
</td>
<td class="nump">96,727<span></span>
</td>
<td class="nump">$ 139,428<span></span>
</td>
<td class="nump">192,793<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_InterestExpenseDebt', window );">Interest Expense, Debt</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">105,607<span></span>
</td>
<td class="nump">$ 243,299<span></span>
</td>
<td class="nump">225,920<span></span>
</td>
<td class="nump">$ 486,597<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_LegalEntityAxis=CLSN_HorizonTechnologyFinanceCorporationMember', window );">Horizon Technology Finance Corporation [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShortTermDebtLineItems', window );"><strong>Short-term Debt [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_LineOfCredit', window );">Long-term Line of Credit</a></td>
<td class="nump">$ 5,425,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 5,000,000<span></span>
</td>
<td class="nump">5,425,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 5,425,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_EndOfTermFees', window );">[custom:EndOfTermFees]</a></td>
<td class="nump">275,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_TypeOfArrangementAxis=CLSN_SVBLoanFacilityMember', window );">SVB Loan Facility [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShortTermDebtLineItems', window );"><strong>Short-term Debt [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity', window );">Line of Credit Facility, Maximum Borrowing Capacity</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">10,000,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ProceedsFromLinesOfCredit', window );">Proceeds from Lines of Credit</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">6,000,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_RestrictedCash', window );">Restricted cash</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">6,000,000.0<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity', window );">Line of Credit Facility, Remaining Borrowing Capacity</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 4,000,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_DebtInstrumentInterestRateStatedPercentage', window );">Debt Instrument, Interest Rate, Stated Percentage</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">3.25%<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_FinalPaymentPercentage', window );">Final payment percentage</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">3.00%<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_LineOfCredit', window );">Long-term Line of Credit</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 10,000,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_LineOfCreditFacilityCommitmentFeeAmount', window );">Line of Credit Facility, Commitment Fee Amount</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 0<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_DebtConversionConvertedInstrumentWarrantsOrOptionsIssued1', window );">Debt Conversion, Converted Instrument, Warrants or Options Issued</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">0<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_DebtInstrumentDescription', window );">Debt Instrument, Description</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">Payments
under the loan agreement are interest only for the first 24 months after loan closing, followed by a 24-month amortization period of
principal and interest through the scheduled maturity date.<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">Payments
under the loan agreement are interest only for the first 24 months after loan closing, followed by a 24-month amortization period of
principal and interest through the scheduled maturity date.<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_InterestAndDebtExpense', window );">Interest and Debt Expense</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 243,370<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_EndOfTermChargePercentage', window );">End of term charge percentage</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">3.00%<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AmortizationOfFinancingCosts', window );">Amortization of Debt Issuance Costs</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 300,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_InterestExpenseDebt', window );">Interest Expense, Debt</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 7,042<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AmortizationOfFinancingCostsAndDiscounts', window );">Amortization of Debt Issuance Costs and Discounts</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">6,457<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_TypeOfArrangementAxis=CLSN_InitialHorizonCreditAgreementMember', window );">Initial Horizon Credit Agreement [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShortTermDebtLineItems', window );"><strong>Short-term Debt [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity', window );">Line of Credit Facility, Maximum Borrowing Capacity</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 10,000,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ProceedsFromLinesOfCredit', window );">Proceeds from Lines of Credit</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">10,000,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity', window );">Line of Credit Facility, Remaining Borrowing Capacity</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">5,000,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_InterestAndDebtExpense', window );">Interest and Debt Expense</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 175,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_EndOfTermChargePercentage', window );">End of term charge percentage</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">4.00%<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_DebtInstrumentFeeAmount', window );">Debt Instrument, Fee Amount</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 142,605<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_LoanProcessingFee', window );">Loan Processing Fee</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">100,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_DebtInstrumentUnamortizedDiscount', window );">Debt Instrument, Unamortized Discount</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">782,116<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_DeferredFinanceCostsNet', window );">Debt Issuance Costs, Net</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">400,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_FairValueAdjustmentOfWarrants', window );">Fair Value Adjustment of Warrants</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">507,116<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_EndOfTermFees', window );">[custom:EndOfTermFees]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 275,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_TypeOfArrangementAxis=CLSN_InitialHorizonCreditAgreementMember', window );">Initial Horizon Credit Agreement [Member] | Common Stock [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShortTermDebtLineItems', window );"><strong>Short-term Debt [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights', window );">Class of Warrant or Right, Number of Securities Called by Warrants or Rights</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">190,114<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1', window );">Class of Warrant or Right, Exercise Price of Warrants or Rights</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 2.63<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ClassOfWarrantOrRightOutstanding', window );">Class of Warrant or Right, Outstanding</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">95,057<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_TypeOfArrangementAxis=CLSN_AmendmentToHorizonCreditAgreementMember', window );">Amendment to Horizon Credit Agreement [Member] | Horizon Technology Finance Corporation [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShortTermDebtLineItems', window );"><strong>Short-term Debt [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_RepaymentsOfNotesPayable', window );">Repayments of Notes Payable</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 5,000,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_PaymentOfDebtEndTermCharges', window );">Debt instrument related end term charges</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">200,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_DebtInstrumentFaceAmount', window );">Debt Instrument, Face Amount</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 5,000,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_DebtInstrumentInterestRateTerms', window );">Debt Instrument, Interest Rate Terms</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">The
obligations bore interest at a rate calculated based an amount by which the one-month LIBOR exceeds 2% plus 7.625%. In no event
shall the interest rate be less than 9.625%. Payments pursuant to the Amendment were interest only for the first twelve (12) months
after August 1, 2020, followed by a 21-month amortization period of principal and interest through the scheduled maturity date on April
1, 2023. In addition, the remaining $5 million in obligations was subject to an end of term fee equal, in the aggregate, to $<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_DebtInstrumentFeeAmount', window );">Debt Instrument, Fee Amount</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 275,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_DebtInstrumentRestrictiveCovenants', window );">Debt Instrument, Restrictive Covenants</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">In
connection with the Amendment, Celsion agreed to a liquidity covenant which provides that, at all times, Celsion shall maintain unrestricted
cash and/or cash equivalents on deposit in accounts over which the applicable Lenders maintain an account control agreement in an amount
not less than $2.5 million. In addition, pursuant to the Amendment, Celsion agreed to provide evidence to Horizon on or before March
31, 2021, that it received aggregate cash proceeds of not less than $5 million from the sale of equity, debt, its New Jersey net operating
losses, or a combination thereof, subsequent to the date of the Amendment.<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_DebtInstrumentUnamortizedDiscount', window );">Debt Instrument, Unamortized Discount</a></td>
<td class="nump">$ 109,706<span></span>
</td>
<td class="nump">$ 200,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 109,706<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">109,706<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_DeferredFinanceCostsNet', window );">Debt Issuance Costs, Net</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">5,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PaymentsOfDebtExtinguishmentCosts', window );">Payment for Debt Extinguishment or Debt Prepayment Cost</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">5,000,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_WarrantsNotSettleableInCashFairValueDisclosure', window );">Warrants Not Settleable in Cash, Fair Value Disclosure</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 247,548<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_TypeOfArrangementAxis=CLSN_AmendmentToHorizonCreditAgreementMember', window );">Amendment to Horizon Credit Agreement [Member] | Horizon Technology Finance Corporation [Member] | Common Stock [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShortTermDebtLineItems', window );"><strong>Short-term Debt [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights', window );">Class of Warrant or Right, Number of Securities Called by Warrants or Rights</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">247,525<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1', window );">Class of Warrant or Right, Exercise Price of Warrants or Rights</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 1.01<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_ClassOfWarrantOrRightWarrantsOrRightsCancelled', window );">Warrants cancelled</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">95,057<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_TypeOfArrangementAxis=CLSN_HorizonCreditAgreementMember', window );">Horizon Credit Agreement [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShortTermDebtLineItems', window );"><strong>Short-term Debt [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_InterestExpenseDebt', window );">Interest Expense, Debt</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">190,581<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_GainLossOnContractTermination', window );">Gain (Loss) on Contract Termination</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 234,419<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_TypeOfArrangementAxis=CLSN_HorizonCreditAgreementMember', window );">Horizon Credit Agreement [Member] | Horizon Technology Finance Corporation [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShortTermDebtLineItems', window );"><strong>Short-term Debt [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_DebtInstrumentFaceAmount', window );">Debt Instrument, Face Amount</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 10,000,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_CLSN_ClassOfWarrantOrRightWarrantsOrRightsCancelled">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Warrants cancelled.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">CLSN_ClassOfWarrantOrRightWarrantsOrRightsCancelled</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>CLSN_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_CLSN_EndOfTermChargePercentage">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>End of term charge percentage.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">CLSN_EndOfTermChargePercentage</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>CLSN_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dtr-types:percentItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_CLSN_EndOfTermFees">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>End of term fees.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">CLSN_EndOfTermFees</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>CLSN_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_CLSN_FinalPaymentPercentage">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Final Payment Percentage.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">CLSN_FinalPaymentPercentage</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>CLSN_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dtr-types:percentItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_CLSN_PaymentOfDebtEndTermCharges">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Debt instrument related end term charges.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">CLSN_PaymentOfDebtEndTermCharges</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>CLSN_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_AmortizationOfFinancingCosts">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of amortization expense attributable to debt issuance costs.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 28<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3602-108585<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 220<br> -SubTopic 10<br> -Section S99<br> -Paragraph 2<br> -Subparagraph (SX 210.5-03(8))<br> -URI http://asc.fasb.org/extlink&amp;oid=123367319&amp;loc=SL114868664-224227<br><br>Reference 3: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 20<br> -Section 50<br> -Paragraph 1F<br> -Subparagraph (b)(2)<br> -URI http://asc.fasb.org/extlink&amp;oid=123466505&amp;loc=SL123495355-112611<br><br>Reference 4: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 835<br> -SubTopic 30<br> -Section 45<br> -Paragraph 3<br> -URI http://asc.fasb.org/extlink&amp;oid=124435984&amp;loc=d3e28555-108399<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AmortizationOfFinancingCosts</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_AmortizationOfFinancingCostsAndDiscounts">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of amortization expense attributable to debt discount (premium) and debt issuance costs.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 28<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3602-108585<br><br>Reference 2: http://www.xbrl.org/2003/role/exampleRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 20<br> -Section 55<br> -Paragraph 69E<br> -URI http://asc.fasb.org/extlink&amp;oid=123466577&amp;loc=SL123495743-112612<br><br>Reference 3: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 835<br> -SubTopic 30<br> -Section 45<br> -Paragraph 3<br> -URI http://asc.fasb.org/extlink&amp;oid=124435984&amp;loc=d3e28555-108399<br><br>Reference 4: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 20<br> -Section 50<br> -Paragraph 1F<br> -Subparagraph (b)(2)<br> -URI http://asc.fasb.org/extlink&amp;oid=123466505&amp;loc=SL123495355-112611<br><br>Reference 5: http://www.xbrl.org/2003/role/exampleRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 20<br> -Section 55<br> -Paragraph 69F<br> -URI http://asc.fasb.org/extlink&amp;oid=123466577&amp;loc=SL123495745-112612<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AmortizationOfFinancingCostsAndDiscounts</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Exercise price per share or per unit of warrants or rights outstanding.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section 50<br> -Paragraph 3<br> -URI http://asc.fasb.org/extlink&amp;oid=123467817&amp;loc=d3e21475-112644<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dtr-types:perShareItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section 50<br> -Paragraph 3<br> -URI http://asc.fasb.org/extlink&amp;oid=123467817&amp;loc=d3e21475-112644<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ClassOfWarrantOrRightOutstanding">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Number of warrants or rights outstanding.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ClassOfWarrantOrRightOutstanding</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_DebtConversionConvertedInstrumentWarrantsOrOptionsIssued1">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The number of warrants issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 50<br> -Paragraph 3<br> -URI http://asc.fasb.org/extlink&amp;oid=123431023&amp;loc=d3e4304-108586<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 50<br> -Paragraph 5<br> -URI http://asc.fasb.org/extlink&amp;oid=123431023&amp;loc=d3e4332-108586<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_DebtConversionConvertedInstrumentWarrantsOrOptionsIssued1</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_DebtInstrumentDescription">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Identification of the lender and information about a contractual promise to repay a short-term or long-term obligation, which includes borrowings under lines of credit, notes payable, commercial paper, bonds payable, debentures, and other contractual obligations for payment. This may include rationale for entering into the arrangement, significant terms of the arrangement, which may include amount, repayment terms, priority, collateral required, debt covenants, borrowing capacity, call features, participation rights, conversion provisions, sinking-fund requirements, voting rights, basis for conversion if convertible and remarketing provisions. The description may be provided for individual debt instruments, rational groupings of debt instruments, or by debt in total.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 944<br> -SubTopic 210<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.7-03(16))<br> -URI http://asc.fasb.org/extlink&amp;oid=120400017&amp;loc=d3e572229-122910<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section 50<br> -Paragraph 3<br> -URI http://asc.fasb.org/extlink&amp;oid=123467817&amp;loc=d3e21475-112644<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 942<br> -SubTopic 210<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.9-03(16))<br> -URI http://asc.fasb.org/extlink&amp;oid=120398452&amp;loc=d3e534808-122878<br><br>Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(22))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 942<br> -SubTopic 210<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.9-03(13))<br> -URI http://asc.fasb.org/extlink&amp;oid=120398452&amp;loc=d3e534808-122878<br><br>Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(19))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 942<br> -SubTopic 470<br> -Section 50<br> -Paragraph 3<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=123599511&amp;loc=d3e64711-112823<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_DebtInstrumentDescription</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
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</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_DebtInstrumentFaceAmount">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Face (par) amount of debt instrument at time of issuance.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 20<br> -Section 50<br> -Paragraph 1B<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=123466505&amp;loc=SL123495323-112611<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 835<br> -SubTopic 30<br> -Section 45<br> -Paragraph 2<br> -URI http://asc.fasb.org/extlink&amp;oid=124435984&amp;loc=d3e28551-108399<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 835<br> -SubTopic 30<br> -Section 55<br> -Paragraph 8<br> -URI http://asc.fasb.org/extlink&amp;oid=114775985&amp;loc=d3e28878-108400<br><br>Reference 4: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 835<br> -SubTopic 30<br> -Section 50<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=124429444&amp;loc=SL124452920-239629<br><br>Reference 5: http://www.xbrl.org/2003/role/exampleRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 20<br> -Section 55<br> -Paragraph 69C<br> -URI http://asc.fasb.org/extlink&amp;oid=123466577&amp;loc=SL123495737-112612<br><br>Reference 6: http://www.xbrl.org/2003/role/exampleRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 20<br> -Section 55<br> -Paragraph 69B<br> -URI http://asc.fasb.org/extlink&amp;oid=123466577&amp;loc=SL123495735-112612<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_DebtInstrumentFaceAmount</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
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<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_DebtInstrumentFeeAmount">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of the fee that accompanies borrowing money under the debt instrument.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.22(b))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_DebtInstrumentFeeAmount</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_DebtInstrumentInterestRateStatedPercentage">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Contractual interest rate for funds borrowed, under the debt agreement.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 20<br> -Section 50<br> -Paragraph 1B<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=123466505&amp;loc=SL123495323-112611<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.22(a)(1))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_DebtInstrumentInterestRateStatedPercentage</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
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</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
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<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_DebtInstrumentInterestRateTerms">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Description of the interest rate as being fixed or variable, and, if variable, identification of the index or rate on which the interest rate is based and the number of points or percentage added to that index or rate to set the rate, and other pertinent information, such as frequency of rate resets.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.22(a)(1))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_DebtInstrumentInterestRateTerms</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
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<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
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<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_DebtInstrumentRestrictiveCovenants">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Description of covenants that limit or prohibit certain actions or activities without the lender's prior consent within a specified period of time or until certain specified targets are achieved for example, reduction of the debt or an increase in net worth to a specified amount).</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 235<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.4-08.(e))<br> -URI http://asc.fasb.org/extlink&amp;oid=120395691&amp;loc=d3e23780-122690<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 942<br> -SubTopic 470<br> -Section 50<br> -Paragraph 3<br> -Subparagraph (g)<br> -URI http://asc.fasb.org/extlink&amp;oid=123599511&amp;loc=d3e64711-112823<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_DebtInstrumentRestrictiveCovenants</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
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<td><strong> Data Type:</strong></td>
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<td><strong> Balance Type:</strong></td>
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<tr>
<td><strong> Period Type:</strong></td>
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</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_DebtInstrumentUnamortizedDiscount">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount, after accumulated amortization, of debt discount.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 835<br> -SubTopic 30<br> -Section 45<br> -Paragraph 1A<br> -URI http://asc.fasb.org/extlink&amp;oid=124435984&amp;loc=d3e28541-108399<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 835<br> -SubTopic 30<br> -Section 55<br> -Paragraph 8<br> -URI http://asc.fasb.org/extlink&amp;oid=114775985&amp;loc=d3e28878-108400<br><br>Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 20<br> -Section 50<br> -Paragraph 1D<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=123466505&amp;loc=SL123495340-112611<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_DebtInstrumentUnamortizedDiscount</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_DeferredFinanceCostsNet">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.17)<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 20<br> -Section 50<br> -Paragraph 1D<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=123466505&amp;loc=SL123495340-112611<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 835<br> -SubTopic 30<br> -Section 45<br> -Paragraph 3<br> -URI http://asc.fasb.org/extlink&amp;oid=124435984&amp;loc=d3e28555-108399<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_DeferredFinanceCostsNet</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_FairValueAdjustmentOfWarrants">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of expense (income) related to adjustment to fair value of warrant liability.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 28<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3602-108585<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 480<br> -SubTopic 10<br> -Section 25<br> -Paragraph 13<br> -URI http://asc.fasb.org/extlink&amp;oid=109262497&amp;loc=d3e20148-110875<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_FairValueAdjustmentOfWarrants</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_GainLossOnContractTermination">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Gain (loss) related to the termination of a contract between the parties. The termination may be due to many causes including early termination of a lease by a lessee, a breach of contract by one party, or a failure to perform.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 28<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3602-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_GainLossOnContractTermination</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_InterestAndDebtExpense">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Interest and debt related expenses associated with nonoperating financing activities of the entity.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 835<br> -SubTopic 20<br> -Section 50<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=6450988&amp;loc=d3e26243-108391<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_InterestAndDebtExpense</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_InterestExpenseDebt">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of the cost of borrowed funds accounted for as interest expense for debt.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 20<br> -Section 50<br> -Paragraph 6<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=123466204&amp;loc=SL6036836-161870<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 220<br> -SubTopic 10<br> -Section S99<br> -Paragraph 2<br> -Subparagraph (SX 210.5-03.8)<br> -URI http://asc.fasb.org/extlink&amp;oid=123367319&amp;loc=SL114868664-224227<br><br>Reference 3: http://www.xbrl.org/2003/role/exampleRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 20<br> -Section 55<br> -Paragraph 69F<br> -URI http://asc.fasb.org/extlink&amp;oid=123466577&amp;loc=SL123495745-112612<br><br>Reference 4: http://www.xbrl.org/2003/role/exampleRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 20<br> -Section 55<br> -Paragraph 69E<br> -URI http://asc.fasb.org/extlink&amp;oid=123466577&amp;loc=SL123495743-112612<br><br>Reference 5: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -SubTopic 20<br> -Section 50<br> -Paragraph 1F<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=123466505&amp;loc=SL123495355-112611<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_InterestExpenseDebt</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_LineOfCredit">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(22))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 942<br> -SubTopic 210<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.9-03(16))<br> -URI http://asc.fasb.org/extlink&amp;oid=120398452&amp;loc=d3e534808-122878<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 944<br> -SubTopic 210<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.7-03(16))<br> -URI http://asc.fasb.org/extlink&amp;oid=120400017&amp;loc=d3e572229-122910<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_LineOfCredit</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_LineOfCreditFacilityCommitmentFeeAmount">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of the fee for available but unused credit capacity under the credit facility.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.19(b),22(b))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_LineOfCreditFacilityCommitmentFeeAmount</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.19(b),22(b))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.19(b),22(b))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_LoanProcessingFee">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Expenses paid for obtaining loans which includes expenses such as application and origination fees.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_LoanProcessingFee</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_PaymentsOfDebtExtinguishmentCosts">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of cash outflow for cost from early extinguishment and prepayment of debt. Includes, but is not limited to, third-party cost, premium paid, and other fee paid to lender directly for debt extinguishment or debt prepayment. Excludes accrued interest.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 15<br> -Subparagraph (g)<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3291-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_PaymentsOfDebtExtinguishmentCosts</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ProceedsFromLinesOfCredit">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 14<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3255-108585<br><br>Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 235<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.4-08(f))<br> -URI http://asc.fasb.org/extlink&amp;oid=120395691&amp;loc=d3e23780-122690<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ProceedsFromLinesOfCredit</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_RepaymentsOfNotesPayable">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The cash outflow for a borrowing supported by a written promise to pay an obligation.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 15<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3291-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_RepaymentsOfNotesPayable</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_RestrictedCash">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of cash restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 50<br> -Paragraph 8<br> -URI http://asc.fasb.org/extlink&amp;oid=123431023&amp;loc=SL98516268-108586<br><br>Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 942<br> -SubTopic 210<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.9-03(1)(a))<br> -URI http://asc.fasb.org/extlink&amp;oid=120398452&amp;loc=d3e534808-122878<br><br>Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 944<br> -SubTopic 210<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.7-03(a)(2))<br> -URI http://asc.fasb.org/extlink&amp;oid=120400017&amp;loc=d3e572229-122910<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_RestrictedCash</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ShortTermDebtLineItems">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShortTermDebtLineItems</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_WarrantsNotSettleableInCashFairValueDisclosure">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Fair value portion of warrants not settleable in cash classified as equity.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 820<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=123874694&amp;loc=d3e19207-110258<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_WarrantsNotSettleableInCashFairValueDisclosure</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_DebtInstrumentAxis=CLSN_InitialHorizonCreditAgreementAmendmentMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_DebtInstrumentAxis=CLSN_InitialHorizonCreditAgreementAmendmentMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_LegalEntityAxis=CLSN_HorizonTechnologyFinanceCorporationMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_LegalEntityAxis=CLSN_HorizonTechnologyFinanceCorporationMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_TypeOfArrangementAxis=CLSN_SVBLoanFacilityMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_TypeOfArrangementAxis=CLSN_SVBLoanFacilityMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_TypeOfArrangementAxis=CLSN_InitialHorizonCreditAgreementMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_TypeOfArrangementAxis=CLSN_InitialHorizonCreditAgreementMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_StatementEquityComponentsAxis=us-gaap_CommonStockMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_StatementEquityComponentsAxis=us-gaap_CommonStockMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_TypeOfArrangementAxis=CLSN_AmendmentToHorizonCreditAgreementMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_TypeOfArrangementAxis=CLSN_AmendmentToHorizonCreditAgreementMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_TypeOfArrangementAxis=CLSN_HorizonCreditAgreementMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_TypeOfArrangementAxis=CLSN_HorizonCreditAgreementMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
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</div>
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</html>
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<SEQUENCE>61
<FILENAME>R51.htm
<DESCRIPTION>IDEA: XBRL DOCUMENT
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<html>
<head>
<title></title>
<link rel="stylesheet" type="text/css" href="report.css">
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<span style="display: none;">v3.21.2</span><table class="report" border="0" cellspacing="2" id="idm140561279506872">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Stockholders&#8217; Equity (Details Narrative) - USD ($)<br></strong></div></th>
<th class="th" colspan="1"></th>
<th class="th" colspan="1"></th>
<th class="th" colspan="1"></th>
<th class="th" colspan="1"></th>
<th class="th" colspan="1"></th>
<th class="th" colspan="1"></th>
<th class="th" colspan="2">1 Months Ended</th>
<th class="th" colspan="1">3 Months Ended</th>
<th class="th" colspan="2">6 Months Ended</th>
<th class="th" colspan="1">12 Months Ended</th>
<th class="th" colspan="1"></th>
</tr>
<tr>
<th class="th"><div>Mar. 19, 2021</div></th>
<th class="th"><div>Jan. 22, 2021</div></th>
<th class="th"><div>Sep. 08, 2020</div></th>
<th class="th"><div>Jun. 22, 2020</div></th>
<th class="th"><div>Feb. 27, 2020</div></th>
<th class="th"><div>Dec. 04, 2018</div></th>
<th class="th"><div>Mar. 31, 2021</div></th>
<th class="th"><div>Sep. 30, 2018</div></th>
<th class="th"><div>Mar. 31, 2021</div></th>
<th class="th"><div>Jun. 30, 2021</div></th>
<th class="th"><div>Jun. 30, 2020</div></th>
<th class="th"><div>Dec. 31, 2020</div></th>
<th class="th"><div>Mar. 12, 2020</div></th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems', window );"><strong>Accumulated Other Comprehensive Income (Loss) [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_ShelfRegistrationStatementAmount', window );">clsn_ShelfRegistrationStatementAmount</a></td>
<td class="nump">$ 100,000,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 75,000,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ProceedsFromIssuanceOfCommonStock', window );">Proceeds from Issuance of Common Stock</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 52,697,265<span></span>
</td>
<td class="nump">$ 18,182,599<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1', window );">Class of Warrant or Right, Exercise Price of Warrants or Rights</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 0.01<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_TypeOfArrangementAxis=CLSN_CapitalOnDemandTMSalesAgreementMember', window );">Capital on DemandTM Sales Agreement [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems', window );"><strong>Accumulated Other Comprehensive Income (Loss) [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_AggregateOfferingPrices', window );">Less than 12 months, unrealized gains, fair value</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 16,000,000.0<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_TypeOfArrangementAxis=CLSN_CapitalOnDemandAgreementMember', window );">Capital on Demand Agreement [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems', window );"><strong>Accumulated Other Comprehensive Income (Loss) [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockIssuedDuringPeriodSharesNewIssues', window );">Stock Issued During Period, Shares, New Issues</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">7,200,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">1,200,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ProceedsFromIssuanceOfCommonStock', window );">Proceeds from Issuance of Common Stock</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 6,900,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 3,500,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_TypeOfArrangementAxis=CLSN_SecuritiesPurchaseAgreementMember', window );">Securities Purchase Agreement [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems', window );"><strong>Accumulated Other Comprehensive Income (Loss) [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockIssuedDuringPeriodSharesNewIssues', window );">Stock Issued During Period, Shares, New Issues</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">4,571,428<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ProceedsFromIssuanceOfCommonStock', window );">Proceeds from Issuance of Common Stock</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 4,800,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SharesIssuedPricePerShare', window );">Shares Issued, Price Per Share</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 1.05<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_TypeOfArrangementAxis=CLSN_SecuritiesPurchaseAgreementMember', window );">Securities Purchase Agreement [Member] | Original Warrants [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems', window );"><strong>Accumulated Other Comprehensive Income (Loss) [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight', window );">Class of Warrant or Right, Number of Securities Called by Each Warrant or Right</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">2,971,428<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_WarrantsAndRightsOutstandingTerm', window );">Warrants and Rights Outstanding, Term</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">5 years<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1', window );">Class of Warrant or Right, Exercise Price of Warrants or Rights</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 1.15<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_TypeOfArrangementAxis=CLSN_ExchangeAgreementsMember', window );">Exchange Agreements [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems', window );"><strong>Accumulated Other Comprehensive Income (Loss) [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight', window );">Class of Warrant or Right, Number of Securities Called by Each Warrant or Right</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">1,200,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ProceedsFromIssuanceOfWarrants', window );">Proceeds from Issuance of Warrants</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 1,500,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_TypeOfArrangementAxis=CLSN_ExchangeAgreementsMember', window );">Exchange Agreements [Member] | Warrant [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems', window );"><strong>Accumulated Other Comprehensive Income (Loss) [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight', window );">Class of Warrant or Right, Number of Securities Called by Each Warrant or Right</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">3,200,000<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_WarrantsAndRightsOutstandingTerm', window );">Warrants and Rights Outstanding, Term</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">5 years<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1', window );">Class of Warrant or Right, Exercise Price of Warrants or Rights</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 1.24<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_TypeOfArrangementAxis=CLSN_UnderwritingAgreementMember', window );">Underwriting Agreement [Member] | Underwritten Offering [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems', window );"><strong>Accumulated Other Comprehensive Income (Loss) [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockIssuedDuringPeriodSharesNewIssues', window );">Stock Issued During Period, Shares, New Issues</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">2,666,667<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ProceedsFromIssuanceOfCommonStock', window );">Proceeds from Issuance of Common Stock</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 9,100,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SharesIssuedPricePerShare', window );">Shares Issued, Price Per Share</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 3.75<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SharePrice', window );">Share Price</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">3.4875<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_UnderwritingDiscountPricePerShare', window );">[custom:UnderwritingDiscountPricePerShare]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 0.2625<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_PercentageOfUnderwritingDiscountOnPublicOfferingPrice', window );">Payments from sale of nols</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">7.00%<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_TypeOfArrangementAxis=CLSN_UnderwritingAgreementMember', window );">Underwriting Agreement [Member] | January 2021 Registered Direct Offering [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems', window );"><strong>Accumulated Other Comprehensive Income (Loss) [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockIssuedDuringPeriodSharesNewIssues', window );">Stock Issued During Period, Shares, New Issues</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">25,925,925<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ProceedsFromIssuanceOfCommonStock', window );">Proceeds from Issuance of Common Stock</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 35,000,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SharePrice', window );">Share Price</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 1.35<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_PlacementAgentFeeDescription', window );">Placement agent fee description.</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">In
connection with the January 2021 Offering, the Company entered into a placement agent agreement (the &#8220;January 2021 Placement Agent
Agreement&#8221;) with A.G.P./Alliance Global Partners (together with Brookline Capital Markets, the &#8220;January 2021 Placement Agents&#8221;)
pursuant to which the Company agreed to pay the January 2021 Placement Agents a cash fee equal to 7% of the aggregate gross proceeds
raised from the sale of the securities sold in the January 2021 Offering and reimburse the January 2021 Placement Agents for certain
of their expenses in an amount not to exceed $82,500.<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_TypeOfArrangementAxis=CLSN_UnderwritingAgreementMember', window );">Underwriting Agreement [Member] | March 2021 Registered Direct Offering [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems', window );"><strong>Accumulated Other Comprehensive Income (Loss) [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockIssuedDuringPeriodSharesNewIssues', window );">Stock Issued During Period, Shares, New Issues</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">11,538,462<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ProceedsFromIssuanceOfCommonStock', window );">Proceeds from Issuance of Common Stock</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 15,000,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SharePrice', window );">Share Price</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 1.30<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 1.30<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_PlacementAgentFeeDescription', window );">Placement agent fee description.</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">In
connection with the March 2021 Offering, the Company entered into a placement agent agreement (the &#8220;March 2021 Placement Agent
Agreement&#8221;) with A.G.P./Alliance Global Partners, as lead placement agent (&#8220;AGP,&#8221; and together with JonesTrading Institutional
Services LLC and Brookline Capital Markets, a division of Arcadia Securities, LLC, serving as co-placement agents, the &#8220;March 2021
Placement Agents&#8221;) pursuant to which the Company agreed to pay the March 2021 Placement Agents an aggregate cash fee equal to 7%
of the aggregate gross proceeds raised from the sale of the securities sold in the Offering and reimburse the Placement Agents for certain
of their expenses in an amount not to exceed $82,500.<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_TypeOfArrangementAxis=CLSN_LPCPurchaseAgreementMember', window );">LPC Purchase Agreement [Member] | Lincoln Park Capital Fund, LLC [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems', window );"><strong>Accumulated Other Comprehensive Income (Loss) [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockIssuedDuringPeriodSharesNewIssues', window );">Stock Issued During Period, Shares, New Issues</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">26,000,000.0<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">3,300,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ProceedsFromIssuanceOfCommonStock', window );">Proceeds from Issuance of Common Stock</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 2,200,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_TypeOfArrangementAxis=CLSN_LPCPurchaseAgreementMember', window );">LPC Purchase Agreement [Member] | LPC Commitment Shares [Member] | Lincoln Park Capital Fund, LLC [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems', window );"><strong>Accumulated Other Comprehensive Income (Loss) [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockIssuedDuringPeriodSharesNewIssues', window );">Stock Issued During Period, Shares, New Issues</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">437,828<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_CLSN_AggregateOfferingPrices">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Aggregate offering price.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">CLSN_AggregateOfferingPrices</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>CLSN_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_CLSN_PercentageOfUnderwritingDiscountOnPublicOfferingPrice">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Percentage of underwriting discount on public offering price.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">CLSN_PercentageOfUnderwritingDiscountOnPublicOfferingPrice</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>CLSN_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dtr-types:percentItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_CLSN_PlacementAgentFeeDescription">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Placement agent fee description.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">CLSN_PlacementAgentFeeDescription</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>CLSN_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_CLSN_ShelfRegistrationStatementAmount">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Shelf Registration statement.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">CLSN_ShelfRegistrationStatementAmount</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>CLSN_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_CLSN_UnderwritingDiscountPricePerShare">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Underwriting discount price per share.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">CLSN_UnderwritingDiscountPricePerShare</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>CLSN_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dtr-types:perShareItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Exercise price per share or per unit of warrants or rights outstanding.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section 50<br> -Paragraph 3<br> -URI http://asc.fasb.org/extlink&amp;oid=123467817&amp;loc=d3e21475-112644<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dtr-types:perShareItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Number of securities into which each warrant or right may be converted. For example, but not limited to, each warrant may be converted into two shares.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ProceedsFromIssuanceOfCommonStock">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The cash inflow from the additional capital contribution to the entity.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 14<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3255-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ProceedsFromIssuanceOfCommonStock</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ProceedsFromIssuanceOfWarrants">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The cash inflow from issuance of rights to purchase common shares at predetermined price (usually issued together with corporate debt).</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 14<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3255-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ProceedsFromIssuanceOfWarrants</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_SharePrice">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Price of a single share of a number of saleable stocks of a company.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_SharePrice</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dtr-types:perShareItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_SharesIssuedPricePerShare">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Per share or per unit amount of equity securities issued.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_SharesIssuedPricePerShare</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dtr-types:perShareItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_StockIssuedDuringPeriodSharesNewIssues">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Number of new stock issued during the period.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(29))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -URI http://asc.fasb.org/extlink&amp;oid=123467817&amp;loc=d3e21463-112644<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.3-04)<br> -URI http://asc.fasb.org/extlink&amp;oid=120397183&amp;loc=d3e187085-122770<br><br>Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(28))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_StockIssuedDuringPeriodSharesNewIssues</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_WarrantsAndRightsOutstandingTerm">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Period between issuance and expiration of outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 820<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (bbb)(2)<br> -URI http://asc.fasb.org/extlink&amp;oid=123874694&amp;loc=d3e19207-110258<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_WarrantsAndRightsOutstandingTerm</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:durationItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_TypeOfArrangementAxis=CLSN_CapitalOnDemandTMSalesAgreementMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_TypeOfArrangementAxis=CLSN_CapitalOnDemandTMSalesAgreementMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_TypeOfArrangementAxis=CLSN_CapitalOnDemandAgreementMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_TypeOfArrangementAxis=CLSN_CapitalOnDemandAgreementMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_TypeOfArrangementAxis=CLSN_SecuritiesPurchaseAgreementMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_TypeOfArrangementAxis=CLSN_SecuritiesPurchaseAgreementMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_StatementEquityComponentsAxis=CLSN_OriginalWarrantsMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_StatementEquityComponentsAxis=CLSN_OriginalWarrantsMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_TypeOfArrangementAxis=CLSN_ExchangeAgreementsMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_TypeOfArrangementAxis=CLSN_ExchangeAgreementsMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_StatementEquityComponentsAxis=us-gaap_WarrantMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_StatementEquityComponentsAxis=us-gaap_WarrantMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_TypeOfArrangementAxis=CLSN_UnderwritingAgreementMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_TypeOfArrangementAxis=CLSN_UnderwritingAgreementMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_SubsidiarySaleOfStockAxis=CLSN_UnderwrittenOfferingMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_SubsidiarySaleOfStockAxis=CLSN_UnderwrittenOfferingMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_SubsidiarySaleOfStockAxis=CLSN_JanuaryRegisteredDirectOfferingMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_SubsidiarySaleOfStockAxis=CLSN_JanuaryRegisteredDirectOfferingMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_SubsidiarySaleOfStockAxis=CLSN_MarchRegisteredDirectOfferingMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_SubsidiarySaleOfStockAxis=CLSN_MarchRegisteredDirectOfferingMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_TypeOfArrangementAxis=CLSN_LPCPurchaseAgreementMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_TypeOfArrangementAxis=CLSN_LPCPurchaseAgreementMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
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<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
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<tr>
<td><strong> Period Type:</strong></td>
<td></td>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_LegalEntityAxis=CLSN_LincolnParkCapitalFundLLCMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_LegalEntityAxis=CLSN_LincolnParkCapitalFundLLCMember</td>
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<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
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<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
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<tr>
<td><strong> Period Type:</strong></td>
<td></td>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_StatementEquityComponentsAxis=CLSN_LPCCommitmentSharesMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_StatementEquityComponentsAxis=CLSN_LPCCommitmentSharesMember</td>
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<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
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<td><strong> Data Type:</strong></td>
<td>na</td>
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<tr>
<td><strong> Balance Type:</strong></td>
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<tr>
<td><strong> Period Type:</strong></td>
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<DESCRIPTION>IDEA: XBRL DOCUMENT
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<head>
<title></title>
<link rel="stylesheet" type="text/css" href="report.css">
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<span style="display: none;">v3.21.2</span><table class="report" border="0" cellspacing="2" id="idm140561288387640">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Summary of Stock Option Awards and Restricted Stock Grants (Details) - USD ($)<br></strong></div></th>
<th class="th" colspan="2">6 Months Ended</th>
</tr>
<tr>
<th class="th"><div>Jun. 30, 2021</div></th>
<th class="th"><div>Jun. 30, 2020</div></th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems', window );"><strong>Share-based Compensation Arrangement by Share-based Payment Award [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice', window );">Weighted Average Exercise Price, Options granted</a></td>
<td class="nump">$ 1.98<span></span>
</td>
<td class="nump">$ 3.10<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AwardTypeAxis=us-gaap_EmployeeStockOptionMember', window );">Share-based Payment Arrangement, Option [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems', window );"><strong>Share-based Compensation Arrangement by Share-based Payment Award [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber', window );">Number Outstanding, Outstanding, Beginning balance</a></td>
<td class="nump">4,624,725<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice', window );">Weighted Average Exercise Price, Outstanding, Beginning balance</a></td>
<td class="nump">$ 2.77<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod', window );">Number Outstanding, Options granted</a></td>
<td class="nump">2,154,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice', window );">Weighted Average Exercise Price, Options granted</a></td>
<td class="nump">$ 2.18<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised', window );">Number Outstanding, Options exercised or vested and issued</a></td>
<td class="num">(7,500)<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice', window );">Weighted Average Exercise Price, Options exercised or vested and issued</a></td>
<td class="nump">$ 0.63<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod', window );">Number Outstanding, Options canceled or expired</a></td>
<td class="num">(92,646)<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice', window );">Weighted Average Exercise Price, Options canceled or expired</a></td>
<td class="nump">$ 2.69<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber', window );">Number Outstanding, Outstanding, Ending balance</a></td>
<td class="nump">6,678,579<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice', window );">Weighted Average Exercise Price, Outstanding, Ending balance</a></td>
<td class="nump">$ 2.58<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2', window );">Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term</a></td>
<td class="text">8 years<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue', window );">Aggregate Intrinsic Value, Outstanding, Ending balance</a></td>
<td class="nump">$ 12,145<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber', window );">Number Outstanding, Exercisable, Ending balance</a></td>
<td class="nump">4,329,286<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice', window );">Weighted Average Exercise Price, Exercisable, Ending balance</a></td>
<td class="nump">$ 2.73<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1', window );">Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term</a></td>
<td class="text">7 years 9 months 18 days<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1', window );">Aggregate Intrinsic Value, Exercisable, Ending balance</a></td>
<td class="nump">$ 1,650<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AwardTypeAxis=us-gaap_RestrictedStockMember', window );">Restricted Stock [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems', window );"><strong>Share-based Compensation Arrangement by Share-based Payment Award [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber', window );">Number Outstanding, Non-vested stock awards, Outstanding, Beginning balance</a></td>
<td class="nump">2,750<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue', window );">Weighted Average Grant Date Fair Value, Non-vested stock awards, Outstanding, Beginning balance</a></td>
<td class="nump">$ 0.89<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod', window );">Number Outstanding, Non-vested stock awards, Granted</a></td>
<td class="nump">7,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue', window );">Weighted Average Grant Date Fair Value, Non-vested stock awards, Granted</a></td>
<td class="nump">$ 1.38<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod', window );">Number Outstanding, Non-vested stock awards, exercised or vested and issued</a></td>
<td class="text"> <span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue', window );">Weighted Average Grant Date Fair Value, Non-vested stock awards, exercised or vested and issued</a></td>
<td class="text"> <span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod', window );">Number Outstanding, Non-vested stock awards, Forfeited</a></td>
<td class="text"> <span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue', window );">Weighted Average Grant Date Fair Value, Non-vested stock awards, Forfeited</a></td>
<td class="text"> <span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber', window );">Number Outstanding, Non-vested stock awards, Outstanding, Ending balance</a></td>
<td class="nump">9,750<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue', window );">Weighted Average Grant Date Fair Value, Non-vested stock awards, Outstanding, Ending balance</a></td>
<td class="nump">$ 1.27<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding', window );">Aggregate Intrinsic Value, Non-vested stock awards, Outstanding, Ending balance</a></td>
<td class="nump">$ 12,383<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (c)(1)(iv)(3)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (c)(2)(iii)(3)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dtr-types:perShareItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (c)(2)(iii)(1)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (c)(2)(iii)(1)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dtr-types:perShareItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (c)(2)(i)-(ii)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (c)(2)(i)-(ii)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dtr-types:perShareItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (c)(2)(iii)(2)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (c)(2)(iii)(2)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dtr-types:perShareItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (c)(1)(iii)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (c)(1)(iii)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dtr-types:perShareItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (c)(1)(iv)(3)-(4)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Weighted average price of options that were either forfeited or expired.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (c)(1)(iv)(3)-(4)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dtr-types:perShareItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Net number of share options (or share units) granted during the period.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (c)(1)(iv)(1)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Number of options outstanding, including both vested and non-vested options.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (c)(1)(i)-(ii)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (c)(1)(i)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dtr-types:perShareItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Weighted average price at which option holders acquired shares when converting their stock options into shares.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dtr-types:perShareItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dtr-types:perShareItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Intrinsic value of outstanding award under share-based payment arrangement. Excludes share and unit options.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:durationItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (e)(1)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:durationItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Number of share options (or share units) exercised during the current period.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (c)(1)(iv)(2)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.3-04)<br> -URI http://asc.fasb.org/extlink&amp;oid=120397183&amp;loc=d3e187085-122770<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(28))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(29))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -URI http://asc.fasb.org/extlink&amp;oid=123467817&amp;loc=d3e21463-112644<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_AwardTypeAxis=us-gaap_EmployeeStockOptionMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AwardTypeAxis=us-gaap_EmployeeStockOptionMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_AwardTypeAxis=us-gaap_RestrictedStockMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AwardTypeAxis=us-gaap_RestrictedStockMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
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<head>
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<span style="display: none;">v3.21.2</span><table class="report" border="0" cellspacing="2" id="idm140561371819112">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Schedule of Assumptions Used to Determine Fair Value of Options Granted (Details)<br></strong></div></th>
<th class="th" colspan="2">6 Months Ended</th>
</tr>
<tr>
<th class="th"><div>Jun. 30, 2021</div></th>
<th class="th"><div>Jun. 30, 2020</div></th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems', window );"><strong>Share-based Compensation Arrangement by Share-based Payment Award [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum', window );">Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum</a></td>
<td class="nump">1.56%<span></span>
</td>
<td class="nump">0.71%<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum', window );">Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Maximum</a></td>
<td class="nump">1.74%<span></span>
</td>
<td class="nump">1.33%<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum', window );">Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Minimum</a></td>
<td class="nump">106.80%<span></span>
</td>
<td class="nump">100.40%<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum', window );">Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Maximum</a></td>
<td class="nump">113.00%<span></span>
</td>
<td class="nump">104.20%<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate', window );">Expected dividend yield</a></td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_srt_RangeAxis=srt_MinimumMember', window );">Minimum [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems', window );"><strong>Share-based Compensation Arrangement by Share-based Payment Award [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1', window );">Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term</a></td>
<td class="text">7 years 6 months<span></span>
</td>
<td class="text">8 years 6 months<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_srt_RangeAxis=srt_MaximumMember', window );">Maximum [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems', window );"><strong>Share-based Compensation Arrangement by Share-based Payment Award [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1', window );">Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term</a></td>
<td class="text">10 years<span></span>
</td>
<td class="text">10 years<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (f)(2)(iii)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dtr-types:percentItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The estimated measure of the maximum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum</td>
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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The estimated measure of the minimum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum">
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<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The maximum risk-free interest rate assumption that is used in valuing an option on its own shares.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum</td>
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<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
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<td><strong> Period Type:</strong></td>
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<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The minimum risk-free interest rate assumption that is used in valuing an option on its own shares.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum</td>
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<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems</td>
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<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
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<td><strong> Balance Type:</strong></td>
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<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (f)(2)(i)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SAB Topic 14.D.2)<br> -URI http://asc.fasb.org/extlink&amp;oid=122041274&amp;loc=d3e301413-122809<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1</td>
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<span style="display: none;">v3.21.2</span><table class="report" border="0" cellspacing="2" id="idm140561278418216">
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<th class="th" colspan="1"></th>
<th class="th" colspan="1"></th>
<th class="th" colspan="2">3 Months Ended</th>
<th class="th" colspan="2">6 Months Ended</th>
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<tr>
<th class="th"><div>Feb. 19, 2019</div></th>
<th class="th"><div>Sep. 28, 2018</div></th>
<th class="th"><div>Jun. 30, 2021</div></th>
<th class="th"><div>Jun. 30, 2020</div></th>
<th class="th"><div>Jun. 30, 2021</div></th>
<th class="th"><div>Jun. 30, 2020</div></th>
<th class="th"><div>Jun. 10, 2021</div></th>
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<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1', window );">Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition</a></td>
<td class="text">&#160;<span></span>
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<td class="text">&#160;<span></span>
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<td class="text">&#160;<span></span>
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<td class="text">1 year 2 months 12 days<span></span>
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<td class="text">&#160;<span></span>
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<td class="text">&#160;<span></span>
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<td class="text">&#160;<span></span>
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<td class="text">&#160;<span></span>
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<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AwardTypeAxis=CLSN_EquityStockAwardsMember', window );">Equity Stock Awards [Member] | Granted Under 2018 Plan and 2007 Plan [Member]</a></td>
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<td class="text">&#160;<span></span>
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<td class="text">&#160;<span></span>
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<td class="text">&#160;<span></span>
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<td class="text">&#160;<span></span>
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<td class="text">&#160;<span></span>
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<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems', window );"><strong>Share-based Compensation Arrangement by Share-based Payment Award [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
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<td class="text">&#160;<span></span>
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<td class="text">&#160;<span></span>
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<td class="text">&#160;<span></span>
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<td class="text">&#160;<span></span>
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<td class="text">&#160;<span></span>
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<td class="text">&#160;<span></span>
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<td class="text">&#160;<span></span>
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<td class="text">&#160;<span></span>
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<td class="nump">6,548,325<span></span>
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<td class="nump">6,548,325<span></span>
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<td class="text">&#160;<span></span>
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<td class="text">&#160;<span></span>
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<td class="text">&#160;<span></span>
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<td class="text">&#160;<span></span>
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<td class="text">&#160;<span></span>
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<td class="text">&#160;<span></span>
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<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
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<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
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<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems', window );"><strong>Share-based Compensation Arrangement by Share-based Payment Award [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CommonStockCapitalSharesReservedForFutureIssuance', window );">Common Stock, Capital Shares Reserved for Future Issuance</a></td>
<td class="text">&#160;<span></span>
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<td class="nump">140,004<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">140,004<span></span>
</td>
<td class="text">&#160;<span></span>
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<td class="text">&#160;<span></span>
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<td class="text">&#160;<span></span>
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<td class="text">&#160;<span></span>
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<td class="text">&#160;<span></span>
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<td class="text">&#160;<span></span>
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<td class="text">&#160;<span></span>
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<td class="text">&#160;<span></span>
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<td class="text">&#160;<span></span>
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<td class="text">&#160;<span></span>
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<td class="text">&#160;<span></span>
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<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems', window );"><strong>Share-based Compensation Arrangement by Share-based Payment Award [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AllocatedShareBasedCompensationExpense', window );">Share-based Payment Arrangement, Expense</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 793,619<span></span>
</td>
<td class="nump">$ 578,761<span></span>
</td>
<td class="nump">$ 2,372,945<span></span>
</td>
<td class="nump">$ 1,030,726<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AwardTypeAxis=CLSN_EmployeeStockOptionAndRestrictedStockAwardsMember', window );">Stock Options and Restricted Stock Awards [Member] | Research and Development Expense [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems', window );"><strong>Share-based Compensation Arrangement by Share-based Payment Award [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AllocatedShareBasedCompensationExpense', window );">Share-based Payment Arrangement, Expense</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">299,581<span></span>
</td>
<td class="nump">200,186<span></span>
</td>
<td class="nump">882,088<span></span>
</td>
<td class="nump">378,122<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AwardTypeAxis=CLSN_EmployeeStockOptionAndRestrictedStockAwardsMember', window );">Stock Options and Restricted Stock Awards [Member] | General and Administrative Expense [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems', window );"><strong>Share-based Compensation Arrangement by Share-based Payment Award [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AllocatedShareBasedCompensationExpense', window );">Share-based Payment Arrangement, Expense</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 494,038<span></span>
</td>
<td class="nump">$ 378,575<span></span>
</td>
<td class="nump">$ 1,490,857<span></span>
</td>
<td class="nump">$ 652,604<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PlanNameAxis=CLSN_TwoThousandAndEighteenStockIncentivePlanMember', window );">2018 Stock Incentive Plan [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems', window );"><strong>Share-based Compensation Arrangement by Share-based Payment Award [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized', window );">Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">2,700,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">2,700,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CommonStockCapitalSharesReservedForFutureIssuance', window );">Common Stock, Capital Shares Reserved for Future Issuance</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">14,198,424<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">14,198,424<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PlanNameAxis=CLSN_TwoThousandAndEighteenStockIncentivePlanMember', window );">2018 Stock Incentive Plan [Member] | Minimum [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems', window );"><strong>Share-based Compensation Arrangement by Share-based Payment Award [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant', window );">Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">7,700,000<span></span>
</td>
<td class="nump">2,500,000<span></span>
</td>
<td class="nump">1,200,000<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PlanNameAxis=CLSN_TwoThousandAndEighteenStockIncentivePlanMember', window );">2018 Stock Incentive Plan [Member] | Maximum [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems', window );"><strong>Share-based Compensation Arrangement by Share-based Payment Award [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant', window );">Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">14,100,000<span></span>
</td>
<td class="nump">6,400,000<span></span>
</td>
<td class="nump">3,900,000<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PlanNameAxis=CLSN_TwoThousandSevenStockIncentivePlanMember', window );">2007 Stock Incentive Plan [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems', window );"><strong>Share-based Compensation Arrangement by Share-based Payment Award [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_StockOptionsStrikePriceDescription', window );">Stock options, strike price description</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">Options
are generally granted with strike prices equal to the fair market value of a share of Celsion common stock on the date of grant. Incentive
stock options may be granted to purchase shares of common stock at a price not less than 100% of the fair market value of the underlying
shares on the date of grant, provided that the exercise price of any incentive stock option granted to an eligible employee owning more
than 10% of the outstanding stock of Celsion must be at least 110% of such fair market value on the date of grant. Only officers and
key employees may receive incentive stock options.<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PlanNameAxis=CLSN_InducementOptionGrantsMember', window );">Inducement Option Grants [Member] | Five New Employees [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems', window );"><strong>Share-based Compensation Arrangement by Share-based Payment Award [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice', window );">Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price</a></td>
<td class="nump">$ 2.18<span></span>
</td>
<td class="nump">$ 2.77<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1', window );">Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period</a></td>
<td class="text">3 years<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PlanNameAxis=CLSN_InducementOptionGrantsMember', window );">Inducement Option Grants [Member] | Five New Employees [Member] | Restricted Stock [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems', window );"><strong>Share-based Compensation Arrangement by Share-based Payment Award [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SharesIssued', window );">Shares, Issued</a></td>
<td class="nump">13,000<span></span>
</td>
<td class="nump">19,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PlanNameAxis=CLSN_InducementOptionGrantsMember', window );">Inducement Option Grants [Member] | Five New Employees [Member] | Common Stock [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems', window );"><strong>Share-based Compensation Arrangement by Share-based Payment Award [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SharesIssued', window );">Shares, Issued</a></td>
<td class="nump">140,004<span></span>
</td>
<td class="nump">164,004<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PlanNameAxis=CLSN_TwoThousandAndEighteenPlanMember', window );">2018 Plan [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems', window );"><strong>Share-based Compensation Arrangement by Share-based Payment Award [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CommonStockCapitalSharesReservedForFutureIssuance', window );">Common Stock, Capital Shares Reserved for Future Issuance</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">7,650,099<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">7,650,099<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_CLSN_StockOptionsStrikePriceDescription">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Stock options, strike price description.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">CLSN_StockOptionsStrikePriceDescription</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>CLSN_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_AllocatedShareBasedCompensationExpense">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 1<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5047-113901<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SAB Topic 14.F)<br> -URI http://asc.fasb.org/extlink&amp;oid=122041274&amp;loc=d3e301413-122809<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (h)(1)(i)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AllocatedShareBasedCompensationExpense</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_CommonStockCapitalSharesReservedForFutureIssuance">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Aggregate number of common shares reserved for future issuance.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.29)<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_CommonStockCapitalSharesReservedForFutureIssuance</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of cost not yet recognized for nonvested award under share-based payment arrangement.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (i)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (i)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:durationItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (a)(1)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
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<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:durationItemType</td>
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<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
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</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Number of shares authorized for issuance under share-based payment arrangement.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (a)(3)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dtr-types:perShareItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_SharesIssued">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Number of shares of stock issued as of the balance sheet date, including shares that had been issued and were previously outstanding but which are now held in the treasury.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -URI http://asc.fasb.org/extlink&amp;oid=123467817&amp;loc=d3e21463-112644<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_SharesIssued</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_AwardTypeAxis=CLSN_EquityStockAwardsMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AwardTypeAxis=CLSN_EquityStockAwardsMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_srt_StatementScenarioAxis=CLSN_GrantedUnderTwoThousandEighteenPlanAndTwoThousandSevenPlanMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">srt_StatementScenarioAxis=CLSN_GrantedUnderTwoThousandEighteenPlanAndTwoThousandSevenPlanMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_AwardTypeAxis=CLSN_InducementAwardsMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AwardTypeAxis=CLSN_InducementAwardsMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_AwardTypeAxis=CLSN_EmployeeStockOptionAndRestrictedStockAwardsMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AwardTypeAxis=CLSN_EmployeeStockOptionAndRestrictedStockAwardsMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_IncomeStatementLocationAxis=us-gaap_ResearchAndDevelopmentExpenseMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_IncomeStatementLocationAxis=us-gaap_ResearchAndDevelopmentExpenseMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_IncomeStatementLocationAxis=us-gaap_GeneralAndAdministrativeExpenseMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_IncomeStatementLocationAxis=us-gaap_GeneralAndAdministrativeExpenseMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_PlanNameAxis=CLSN_TwoThousandAndEighteenStockIncentivePlanMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_PlanNameAxis=CLSN_TwoThousandAndEighteenStockIncentivePlanMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_srt_RangeAxis=srt_MinimumMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">srt_RangeAxis=srt_MinimumMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_srt_RangeAxis=srt_MaximumMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">srt_RangeAxis=srt_MaximumMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_PlanNameAxis=CLSN_TwoThousandSevenStockIncentivePlanMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_PlanNameAxis=CLSN_TwoThousandSevenStockIncentivePlanMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_PlanNameAxis=CLSN_InducementOptionGrantsMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_PlanNameAxis=CLSN_InducementOptionGrantsMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_srt_TitleOfIndividualAxis=CLSN_FiveNewEmployeesMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">srt_TitleOfIndividualAxis=CLSN_FiveNewEmployeesMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_AwardTypeAxis=us-gaap_RestrictedStockMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AwardTypeAxis=us-gaap_RestrictedStockMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_StatementEquityComponentsAxis=us-gaap_CommonStockMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_StatementEquityComponentsAxis=us-gaap_CommonStockMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_PlanNameAxis=CLSN_TwoThousandAndEighteenPlanMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_PlanNameAxis=CLSN_TwoThousandAndEighteenPlanMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
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</table>
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</body>
</html>
</TEXT>
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<DOCUMENT>
<TYPE>XML
<SEQUENCE>65
<FILENAME>R55.htm
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
<html>
<head>
<title></title>
<link rel="stylesheet" type="text/css" href="report.css">
<script type="text/javascript" src="Show.js">/* Do Not Remove This Comment */</script><script type="text/javascript">
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<span style="display: none;">v3.21.2</span><table class="report" border="0" cellspacing="2" id="idm140561287741912">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Schedule of Changes in Earn-out Milestone Liability (Details)<br></strong></div></th>
<th class="th" colspan="1">6 Months Ended</th>
</tr>
<tr><th class="th">
<div>Jun. 30, 2021 </div>
<div>USD ($)</div>
</th></tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_DisclosureEarnoutMilestoneLiabilityAbstract', window );"><strong>Earn-out Milestone Liability</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_EarnoutMilestoneLiability', window );">Earn-out liabilities, beginning balance</a></td>
<td class="num">$ (7,018,000)<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_GainLossFromChangeInFairValueOfEarnOutMilestoneLiability', window );">Non-cash gain loss from the adjustment for the change in fair value</a></td>
<td class="num">(70,000)<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_EarnoutMilestoneLiability', window );">Earn-out liabilities, ending balance</a></td>
<td class="num">$ (7,088,000)<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_CLSN_DisclosureEarnoutMilestoneLiabilityAbstract">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">CLSN_DisclosureEarnoutMilestoneLiabilityAbstract</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>CLSN_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
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<tr>
<td><strong> Period Type:</strong></td>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_CLSN_EarnoutMilestoneLiability">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Earn-out liabilities, beginning balance.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">CLSN_EarnoutMilestoneLiability</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>CLSN_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_CLSN_GainLossFromChangeInFairValueOfEarnOutMilestoneLiability">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The amount of gain (loss) from the change in the fair value of earn-out milestone liability.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">CLSN_GainLossFromChangeInFairValueOfEarnOutMilestoneLiability</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>CLSN_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
</div>
</body>
</html>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>XML
<SEQUENCE>66
<FILENAME>R56.htm
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
<html>
<head>
<title></title>
<link rel="stylesheet" type="text/css" href="report.css">
<script type="text/javascript" src="Show.js">/* Do Not Remove This Comment */</script><script type="text/javascript">
							function toggleNextSibling (e) {
							if (e.nextSibling.style.display=='none') {
							e.nextSibling.style.display='block';
							} else { e.nextSibling.style.display='none'; }
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</head>
<body>
<span style="display: none;">v3.21.2</span><table class="report" border="0" cellspacing="2" id="idm140561284642040">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Schedule of Risk Adjustment Assessment (Details)<br></strong></div></th>
<th class="th" colspan="2">3 Months Ended</th>
<th class="th" colspan="2">6 Months Ended</th>
<th class="th" colspan="2">12 Months Ended</th>
</tr>
<tr>
<th class="th"><div>Mar. 31, 2021</div></th>
<th class="th"><div>Mar. 31, 2020</div></th>
<th class="th"><div>Jun. 30, 2021</div></th>
<th class="th"><div>Jun. 30, 2020</div></th>
<th class="th"><div>Dec. 31, 2020</div></th>
<th class="th"><div>Dec. 31, 2019</div></th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_srt_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersLineItems', window );"><strong>SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_RiskadjustmentAssessmentOfAchievingMilestone', window );">Risk-adjustment Assessment of achieving each Milestone</a></td>
<td class="nump">80.00%<span></span>
</td>
<td class="nump">80.00%<span></span>
</td>
<td class="nump">80.00%<span></span>
</td>
<td class="nump">80.00%<span></span>
</td>
<td class="nump">80.00%<span></span>
</td>
<td class="nump">80.00%<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_DiscountRatesOnMileStoneLiabilities', window );">Discount Rate</a></td>
<td class="nump">9.00%<span></span>
</td>
<td class="nump">9.00%<span></span>
</td>
<td class="nump">9.00%<span></span>
</td>
<td class="nump">9.00%<span></span>
</td>
<td class="nump">9.00%<span></span>
</td>
<td class="nump">9.00%<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_srt_RangeAxis=srt_MinimumMember', window );">Minimum [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_srt_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersLineItems', window );"><strong>SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_EstimatedTimeToAchieveMileStone', window );">[custom:EstimatedTimeToAchieveMileStone]</a></td>
<td class="text">3 months 14 days<span></span>
</td>
<td class="text">1 year 14 days<span></span>
</td>
<td class="text">5 months 1 day<span></span>
</td>
<td class="text">6 months 14 days<span></span>
</td>
<td class="text">6 months 14 days<span></span>
</td>
<td class="text">1 year 1 month 13 days<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_srt_RangeAxis=srt_MaximumMember', window );">Maximum [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_srt_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersLineItems', window );"><strong>SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_EstimatedTimeToAchieveMileStone', window );">[custom:EstimatedTimeToAchieveMileStone]</a></td>
<td class="text">1 year 3 months 14 days<span></span>
</td>
<td class="text">2 years 14 days<span></span>
</td>
<td class="text">1 year 5 months 1 day<span></span>
</td>
<td class="text">1 year 6 months 14 days<span></span>
</td>
<td class="text">1 year 6 months 14 days<span></span>
</td>
<td class="text">2 years 1 month 13 days<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_CLSN_DiscountRatesOnMileStoneLiabilities">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Discount Rate on milestone liabilities.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">CLSN_DiscountRatesOnMileStoneLiabilities</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>CLSN_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dtr-types:percentItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_CLSN_EstimatedTimeToAchieveMileStone">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Estimated time to achieve milestone liability.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">CLSN_EstimatedTimeToAchieveMileStone</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>CLSN_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:durationItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_CLSN_RiskadjustmentAssessmentOfAchievingMilestone">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Risk-adjustment Assessment of achieving each Milestone.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">CLSN_RiskadjustmentAssessmentOfAchievingMilestone</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>CLSN_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dtr-types:percentItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_srt_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersLineItems">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">srt_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersLineItems</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>srt_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_srt_RangeAxis=srt_MinimumMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">srt_RangeAxis=srt_MinimumMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_srt_RangeAxis=srt_MaximumMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">srt_RangeAxis=srt_MaximumMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
</div>
</body>
</html>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>XML
<SEQUENCE>67
<FILENAME>R57.htm
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
<html>
<head>
<title></title>
<link rel="stylesheet" type="text/css" href="report.css">
<script type="text/javascript" src="Show.js">/* Do Not Remove This Comment */</script><script type="text/javascript">
							function toggleNextSibling (e) {
							if (e.nextSibling.style.display=='none') {
							e.nextSibling.style.display='block';
							} else { e.nextSibling.style.display='none'; }
							}</script>
</head>
<body>
<span style="display: none;">v3.21.2</span><table class="report" border="0" cellspacing="2" id="idm140561288172296">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Earn-Out Milestone Liability (Details Narrative) - USD ($)<br> $ in Millions</strong></div></th>
<th class="th" colspan="4">3 Months Ended</th>
<th class="th" colspan="2">6 Months Ended</th>
<th class="th" colspan="2">12 Months Ended</th>
<th class="th" colspan="1"></th>
</tr>
<tr>
<th class="th"><div>Jun. 30, 2021</div></th>
<th class="th"><div>Mar. 31, 2021</div></th>
<th class="th"><div>Jun. 30, 2020</div></th>
<th class="th"><div>Mar. 31, 2020</div></th>
<th class="th"><div>Jun. 30, 2021</div></th>
<th class="th"><div>Jun. 30, 2020</div></th>
<th class="th"><div>Dec. 31, 2020</div></th>
<th class="th"><div>Dec. 31, 2019</div></th>
<th class="th"><div>Mar. 28, 2019</div></th>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_BusinessAcquisitionAxis=CLSN_EGWCMember', window );">EGWC, Inc [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems', window );"><strong>Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_NoncashChargeOnEarnoutMilestoneLiability', window );">Non-cash charge on earnout milestone liability</a></td>
<td class="nump">$ 0.1<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 0.2<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 0.1<span></span>
</td>
<td class="nump">$ 0.3<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_EarnoutPaymentOptionsDescription', window );">[custom:EarnoutPaymentOptionsDescription]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">In
assessing the earnout milestone liability at June 30, 2021 and March 31, 2021, the Company fair valued each of the two payment options
per the Amended Asset Purchase Agreement and weighted them at 50% / 50% probability for the $7.0 million and the $12.4 million payments,
respectively.<span></span>
</td>
<td class="text">In
assessing the earnout milestone liability at June 30, 2020 and March 31, 2020, the Company fair valued each of the two payment options
per the Amended Asset Purchase Agreement and weighted them at 80% / 20% probability for the $7.0 million and the $12.4 million
payments, respectively.<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_TypeOfArrangementAxis=CLSN_AmendedAssetPurchaseAgreementMember', window );">Amended Asset Purchase Agreement [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems', window );"><strong>Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_EarnoutMilestoneLiability1', window );">Earnout milestone liability</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 12.4<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_TypeOfArrangementAxis=CLSN_AmendedAssetPurchaseAgreementMember', window );">Amended Asset Purchase Agreement [Member] | Within One Year of Achieving Milestone [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems', window );"><strong>Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_EarnoutMilestoneLiability1', window );">Earnout milestone liability</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">12.4<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_TypeOfArrangementAxis=CLSN_AmendedAssetPurchaseAgreementMember', window );">Amended Asset Purchase Agreement [Member] | 10 Business Days of Achieving Milestone [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems', window );"><strong>Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_EarnoutMilestoneLiability1', window );">Earnout milestone liability</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 7.0<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_TypeOfArrangementAxis=CLSN_FairValueEarnoutMilestoneLiabilityMember', window );">Fair Value Earnout Milestone Liability [Member] | EGWC, Inc [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems', window );"><strong>Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred', window );">Business Combination, Consideration Transferred, Liabilities Incurred</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 7.2<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 5.8<span></span>
</td>
<td class="nump">$ 7.1<span></span>
</td>
<td class="nump">$ 6.0<span></span>
</td>
<td class="nump">$ 7.0<span></span>
</td>
<td class="nump">$ 5.7<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_CLSN_EarnoutMilestoneLiability1">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Earnout milestone liability.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">CLSN_EarnoutMilestoneLiability1</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>CLSN_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_CLSN_EarnoutPaymentOptionsDescription">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Earn-out payment options, description.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">CLSN_EarnoutPaymentOptionsDescription</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>CLSN_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_CLSN_NoncashChargeOnEarnoutMilestoneLiability">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Non-cash charge on earnout milestone liability.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">CLSN_NoncashChargeOnEarnoutMilestoneLiability</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>CLSN_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of liabilities incurred by the acquirer as part of consideration transferred in a business combination.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 805<br> -SubTopic 30<br> -Section 30<br> -Paragraph 7<br> -URI http://asc.fasb.org/extlink&amp;oid=116859721&amp;loc=d3e6578-128477<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 805<br> -SubTopic 30<br> -Section 25<br> -Paragraph 5<br> -URI http://asc.fasb.org/extlink&amp;oid=6911189&amp;loc=d3e6405-128476<br><br>Reference 3: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 805<br> -SubTopic 30<br> -Section 50<br> -Paragraph 1<br> -Subparagraph (b)(3)<br> -URI http://asc.fasb.org/extlink&amp;oid=120321790&amp;loc=d3e6927-128479<br><br>Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 805<br> -SubTopic 30<br> -Section 30<br> -Paragraph 8<br> -URI http://asc.fasb.org/extlink&amp;oid=116859721&amp;loc=d3e6613-128477<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_BusinessAcquisitionAxis=CLSN_EGWCMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_BusinessAcquisitionAxis=CLSN_EGWCMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_TypeOfArrangementAxis=CLSN_AmendedAssetPurchaseAgreementMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_TypeOfArrangementAxis=CLSN_AmendedAssetPurchaseAgreementMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_RelatedPartyTransactionAxis=CLSN_AchievingMilestoneWithInOneYearMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_RelatedPartyTransactionAxis=CLSN_AchievingMilestoneWithInOneYearMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_RelatedPartyTransactionAxis=CLSN_CertainBusinessDaysOfAchievingMilestoneMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_RelatedPartyTransactionAxis=CLSN_CertainBusinessDaysOfAchievingMilestoneMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_TypeOfArrangementAxis=CLSN_FairValueEarnoutMilestoneLiabilityMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_TypeOfArrangementAxis=CLSN_FairValueEarnoutMilestoneLiabilityMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
</div>
</body>
</html>
</TEXT>
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<SEQUENCE>68
<FILENAME>R58.htm
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
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<span style="display: none;">v3.21.2</span><table class="report" border="0" cellspacing="2" id="idm140561281143736">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Summary of Warrant Activity (Details)<br></strong></div></th>
<th class="th" colspan="1">6 Months Ended</th>
</tr>
<tr><th class="th">
<div>Jun. 30, 2021 </div>
<div>USD ($) </div>
<div>$ / shares </div>
<div>shares</div>
</th></tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_DisclosureWarrantsAbstract', window );"><strong>Warrants</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber', window );">Number of Warrants Issued, Warrants outstanding, Beginning balance | shares</a></td>
<td class="nump">3,853,566<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingWeightedAverageExercisePrice', window );">Weighted Average Exercise Price, Warrants outstanding, Beginning balance | $ / shares</a></td>
<td class="nump">$ 1.35<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised', window );">Number of Warrants Issued, Warrants exercised | shares</a></td>
<td class="num">(1,216,667)<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExerciseInPeriodWeightedAverageExercisePrice', window );">Weighted Average Exercise Price, Warrants exercised | $ / shares</a></td>
<td class="nump">$ 1.24<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber', window );">Number of Warrants Issued, Warrants outstanding, Ending balance | shares</a></td>
<td class="nump">2,636,899<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingWeightedAverageExercisePrice', window );">Weighted Average Exercise Price, Warrants outstanding, Ending balance | $ / shares</a></td>
<td class="nump">$ 1.40<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionsOutstandingIntrinsicValue', window );">Aggregate intrinsic value of outstanding warrants | $</a></td>
<td class="nump">$ 159,857<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_SharebasedCompensationArrangementBySharebasedPaymentAwardNonOptionsOutstandingWeightedAverageRemainingContractualTerm2', window );">Weighted average remaining contractual terms (years)</a></td>
<td class="text">4 years 7 months 6 days<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_CLSN_DisclosureWarrantsAbstract">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">CLSN_DisclosureWarrantsAbstract</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>CLSN_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_CLSN_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExerciseInPeriodWeightedAverageExercisePrice">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Share based compensation arrangement by share based payment award non option equity instruments exercised in period weighted average exercise price.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">CLSN_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExerciseInPeriodWeightedAverageExercisePrice</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>CLSN_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dtr-types:perShareItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_CLSN_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingWeightedAverageExercisePrice">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Weighted average price at which grantees can acquire the shares reserved for issuance under the stock non-option equity plan.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">CLSN_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingWeightedAverageExercisePrice</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>CLSN_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dtr-types:perShareItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_CLSN_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionsOutstandingIntrinsicValue">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Sharebased compensation arrangement by sharebased payment award non options outstanding intrinsic value.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">CLSN_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionsOutstandingIntrinsicValue</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>CLSN_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_CLSN_SharebasedCompensationArrangementBySharebasedPaymentAwardNonOptionsOutstandingWeightedAverageRemainingContractualTerm2">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Weighted average remaining contractual term for non-option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">CLSN_SharebasedCompensationArrangementBySharebasedPaymentAwardNonOptionsOutstandingWeightedAverageRemainingContractualTerm2</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>CLSN_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:durationItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Number of non-option equity instruments exercised by participants.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (c)(1)(iv)(2)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Number of equity instruments other than options outstanding, including both vested and non-vested instruments.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (c)(1)(ii)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (c)(1)(i)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
</div>
</body>
</html>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>XML
<SEQUENCE>69
<FILENAME>R59.htm
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
<html>
<head>
<title></title>
<link rel="stylesheet" type="text/css" href="report.css">
<script type="text/javascript" src="Show.js">/* Do Not Remove This Comment */</script><script type="text/javascript">
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<body>
<span style="display: none;">v3.21.2</span><table class="report" border="0" cellspacing="2" id="idm140561284517096">
<tr>
<th class="tl" colspan="1" rowspan="1"><div style="width: 200px;"><strong>Schedule of Lease Payments and Maturity of Operating Lease Liabilities (Details) - USD ($)<br></strong></div></th>
<th class="th"><div>Jun. 30, 2021</div></th>
<th class="th"><div>Jan. 02, 2019</div></th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_DisclosureLeasesAbstract', window );"><strong>Leases</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths', window );">Remainder of 2021</a></td>
<td class="nump">$ 266,188<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo', window );">2022</a></td>
<td class="nump">535,579<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree', window );">2023</a></td>
<td class="nump">233,116<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearThreeAndThereAfter', window );">2024 and thereafter</a></td>
<td class="text"> <span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rou">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue', window );">Subtotal future lease payments</a></td>
<td class="nump">1,034,883<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_OperatingLeaseImputedInterest', window );">Less imputed interest</a></td>
<td class="num">(101,664)<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OperatingLeaseLiability', window );">Total lease liabilities</a></td>
<td class="nump">$ 933,219<span></span>
</td>
<td class="nump">$ 1,900,000<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1', window );">Operating Lease, Weighted Average Remaining Lease Term</a></td>
<td class="text">2 years<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent', window );">Operating Lease, Weighted Average Discount Rate, Percent</a></td>
<td class="nump">9.98%<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_CLSN_DisclosureLeasesAbstract">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">CLSN_DisclosureLeasesAbstract</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>CLSN_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_CLSN_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearThreeAndThereAfter">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Lessee, operating lease, liability, to be paid, year four and there after.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">CLSN_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearThreeAndThereAfter</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>CLSN_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_CLSN_OperatingLeaseImputedInterest">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">CLSN_OperatingLeaseImputedInterest</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>CLSN_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of lessee's undiscounted obligation for lease payment for operating lease.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -Section 50<br> -Paragraph 6<br> -URI http://asc.fasb.org/extlink&amp;oid=123408670&amp;loc=SL77918701-209980<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -Section 50<br> -Paragraph 6<br> -URI http://asc.fasb.org/extlink&amp;oid=123408670&amp;loc=SL77918701-209980<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -Section 50<br> -Paragraph 6<br> -URI http://asc.fasb.org/extlink&amp;oid=123408670&amp;loc=SL77918701-209980<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -Section 50<br> -Paragraph 6<br> -URI http://asc.fasb.org/extlink&amp;oid=123408670&amp;loc=SL77918701-209980<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_OperatingLeaseLiability">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Present value of lessee's discounted obligation for lease payments from operating lease.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -Section 45<br> -Paragraph 1<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=123391704&amp;loc=SL77918627-209977<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_OperatingLeaseLiability</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Weighted average discount rate for operating lease calculated at point in time.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -Section 50<br> -Paragraph 4<br> -Subparagraph (g)(4)<br> -URI http://asc.fasb.org/extlink&amp;oid=123408670&amp;loc=SL77918686-209980<br><br>Reference 2: http://www.xbrl.org/2003/role/exampleRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -Section 55<br> -Paragraph 53<br> -URI http://asc.fasb.org/extlink&amp;oid=123414884&amp;loc=SL77918982-209971<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dtr-types:percentItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/exampleRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -Section 55<br> -Paragraph 53<br> -URI http://asc.fasb.org/extlink&amp;oid=123414884&amp;loc=SL77918982-209971<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -Section 50<br> -Paragraph 4<br> -Subparagraph (g)(3)<br> -URI http://asc.fasb.org/extlink&amp;oid=123408670&amp;loc=SL77918686-209980<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:durationItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
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<span style="display: none;">v3.21.2</span><table class="report" border="0" cellspacing="2" id="idm140561283655752">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Leases (Details Narrative)<br></strong></div></th>
<th class="th" colspan="1"></th>
<th class="th" colspan="2">1 Months Ended</th>
<th class="th" colspan="2">3 Months Ended</th>
<th class="th" colspan="2">6 Months Ended</th>
<th class="th" colspan="1"></th>
</tr>
<tr>
<th class="th">
<div>Jan. 02, 2019 </div>
<div>USD ($)</div>
</th>
<th class="th">
<div>Jan. 31, 2018 </div>
<div>USD ($)</div>
</th>
<th class="th">
<div>Jul. 31, 2011 </div>
<div>ft&#178;</div>
</th>
<th class="th">
<div>Jun. 30, 2021 </div>
<div>USD ($)</div>
</th>
<th class="th">
<div>Jun. 30, 2020 </div>
<div>USD ($)</div>
</th>
<th class="th">
<div>Jun. 30, 2021 </div>
<div>USD ($)</div>
</th>
<th class="th">
<div>Jun. 30, 2020 </div>
<div>USD ($)</div>
</th>
<th class="th">
<div>Dec. 31, 2020 </div>
<div>USD ($) </div>
<div>ft&#178;</div>
</th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_srt_MortgageLoansOnRealEstateLineItems', window );"><strong>SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_LesseeOperatingLeaseDescription', window );">Lessee, Operating Lease, Description</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">In
2011, the Company executed a lease (the &#8220;Lease&#8221;) with Brandywine Operating Partnership, L.P. (Brandywine), a Delaware
limited partnership, for a<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AreaOfLand', window );">Area of Land | ft&#178;</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">10,870<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_LesseeOperatingLeaseTermOfContract', window );">Lessee, Operating Lease, Term of Contract</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">66 months<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_LeaseExpirationDate1', window );">Lease Expiration Date</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">Apr. 30,  2017<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OperatingLeaseRightOfUseAsset', window );">Operating Lease, Right-of-Use Asset</a></td>
<td class="nump">$ 400,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 840,195<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 840,195<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 1,047,336<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OperatingLeaseLiability', window );">Operating Lease, Liability</a></td>
<td class="nump">1,900,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">933,219<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">933,219<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability', window );">Right-of-Use Asset Obtained in Exchange for Operating Lease Liability</a></td>
<td class="nump">1,800,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OperatingLeasePayments', window );">Operating Lease, Payments</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">264,546<span></span>
</td>
<td class="nump">$ 262,084<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis=us-gaap_AccountingStandardsUpdate201602Member', window );">Accounting Standards Update 2016-02 [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_srt_MortgageLoansOnRealEstateLineItems', window );"><strong>SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OperatingLeaseRightOfUseAsset', window );">Operating Lease, Right-of-Use Asset</a></td>
<td class="nump">1,400,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OperatingLeaseLiability', window );">Operating Lease, Liability</a></td>
<td class="nump">1,500,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OtherLiabilities', window );">Other Liabilities</a></td>
<td class="nump">$ 100,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_srt_StatementGeographicalAxis=CLSN_HuntsvilleAlabamaMember', window );">Huntsville Alabama [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_srt_MortgageLoansOnRealEstateLineItems', window );"><strong>SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AreaOfLand', window );">Area of Land | ft&#178;</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">11,500<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_TypeOfArrangementAxis=CLSN_FirstLeaseAmendmentMember', window );">1st Lease Amendment [Member] | First Year [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_srt_MortgageLoansOnRealEstateLineItems', window );"><strong>SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PaymentsForRent', window );">Payments for Rent</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">18,900<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_TypeOfArrangementAxis=CLSN_FirstLeaseAmendmentMember', window );">1st Lease Amendment [Member] | Final Year [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_srt_MortgageLoansOnRealEstateLineItems', window );"><strong>SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PaymentsForRent', window );">Payments for Rent</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">20,500<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_TypeOfArrangementAxis=CLSN_SecondLeaseAmendmentMember', window );">2nd Lease Amendment [Member] | First Year [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_srt_MortgageLoansOnRealEstateLineItems', window );"><strong>SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PaymentsForRent', window );">Payments for Rent</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">25,035<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_TypeOfArrangementAxis=CLSN_SecondLeaseAmendmentMember', window );">2nd Lease Amendment [Member] | Final Year [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_srt_MortgageLoansOnRealEstateLineItems', window );"><strong>SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PaymentsForRent', window );">Payments for Rent</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">27,088<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_TypeOfArrangementAxis=CLSN_EGENAssetPurchaseAgreementMember', window );">EGEN Asset Purchase Agreement [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_srt_MortgageLoansOnRealEstateLineItems', window );"><strong>SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_LesseeOperatingLeaseDescription', window );">Lessee, Operating Lease, Description</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">In
connection with the EGEN Asset Purchase Agreement in June 2014, the Company assumed the existing lease with another landlord for an<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PaymentsForRent', window );">Payments for Rent</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 18,100<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_TypeOfArrangementAxis=CLSN_OperatingLeasesMember', window );">Operating Leases [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_srt_MortgageLoansOnRealEstateLineItems', window );"><strong>SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OperatingLeaseCost', window );">Operating Lease, Cost</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">130,595<span></span>
</td>
<td class="nump">$ 130,595<span></span>
</td>
<td class="nump">261,190<span></span>
</td>
<td class="nump">261,190<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OperatingLeasePayments', window );">Operating Lease, Payments</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 132,684<span></span>
</td>
<td class="nump">$ 131,452<span></span>
</td>
<td class="nump">$ 264,546<span></span>
</td>
<td class="nump">$ 262,084<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_srt_MortgageLoansOnRealEstateLineItems">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">srt_MortgageLoansOnRealEstateLineItems</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>srt_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_AreaOfLand">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Area of land held.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AreaOfLand</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dtr-types:areaItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_LeaseExpirationDate1">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Date which lease or group of leases is set to expire, in YYYY-MM-DD format.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_LeaseExpirationDate1</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:dateItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_LesseeOperatingLeaseDescription">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Description of lessee's operating lease.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -Section 50<br> -Paragraph 3<br> -Subparagraph (a)(1)<br> -URI http://asc.fasb.org/extlink&amp;oid=123408670&amp;loc=SL77918673-209980<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_LesseeOperatingLeaseDescription</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_LesseeOperatingLeaseTermOfContract">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -Section 50<br> -Paragraph 3<br> -Subparagraph (a)(3)<br> -URI http://asc.fasb.org/extlink&amp;oid=123408670&amp;loc=SL77918673-209980<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_LesseeOperatingLeaseTermOfContract</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:durationItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_OperatingLeaseCost">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/exampleRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -Section 55<br> -Paragraph 53<br> -URI http://asc.fasb.org/extlink&amp;oid=123414884&amp;loc=SL77918982-209971<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -Section 50<br> -Paragraph 4<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=123408670&amp;loc=SL77918686-209980<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_OperatingLeaseCost</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_OperatingLeaseLiability">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Present value of lessee's discounted obligation for lease payments from operating lease.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -Section 45<br> -Paragraph 1<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=123391704&amp;loc=SL77918627-209977<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_OperatingLeaseLiability</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_OperatingLeasePayments">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -Section 45<br> -Paragraph 5<br> -Subparagraph (c)<br> -URI http://asc.fasb.org/extlink&amp;oid=123391704&amp;loc=SL77918643-209977<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -Section 50<br> -Paragraph 4<br> -Subparagraph (g)(1)<br> -URI http://asc.fasb.org/extlink&amp;oid=123408670&amp;loc=SL77918686-209980<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_OperatingLeasePayments</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_OperatingLeaseRightOfUseAsset">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of lessee's right to use underlying asset under operating lease.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -Section 45<br> -Paragraph 1<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=123391704&amp;loc=SL77918627-209977<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_OperatingLeaseRightOfUseAsset</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_OtherLiabilities">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of liabilities classified as other.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 942<br> -SubTopic 210<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.9-03.15)<br> -URI http://asc.fasb.org/extlink&amp;oid=120398452&amp;loc=d3e534808-122878<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_OtherLiabilities</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_PaymentsForRent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Cash payments to lessor's for use of assets under operating leases.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 25<br> -Subparagraph (g)<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3536-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_PaymentsForRent</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of increase in right-of-use asset obtained in exchange for operating lease liability.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/exampleRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -Section 55<br> -Paragraph 53<br> -URI http://asc.fasb.org/extlink&amp;oid=123414884&amp;loc=SL77918982-209971<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -Section 50<br> -Paragraph 4<br> -Subparagraph (g)(2)<br> -URI http://asc.fasb.org/extlink&amp;oid=123408670&amp;loc=SL77918686-209980<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis=us-gaap_AccountingStandardsUpdate201602Member">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AdjustmentsForNewAccountingPronouncementsAxis=us-gaap_AccountingStandardsUpdate201602Member</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_srt_StatementGeographicalAxis=CLSN_HuntsvilleAlabamaMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">srt_StatementGeographicalAxis=CLSN_HuntsvilleAlabamaMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_TypeOfArrangementAxis=CLSN_FirstLeaseAmendmentMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_TypeOfArrangementAxis=CLSN_FirstLeaseAmendmentMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_AwardTypeAxis=CLSN_FirstYearMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AwardTypeAxis=CLSN_FirstYearMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_AwardTypeAxis=CLSN_FinalYearMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AwardTypeAxis=CLSN_FinalYearMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_TypeOfArrangementAxis=CLSN_SecondLeaseAmendmentMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_TypeOfArrangementAxis=CLSN_SecondLeaseAmendmentMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_TypeOfArrangementAxis=CLSN_EGENAssetPurchaseAgreementMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_TypeOfArrangementAxis=CLSN_EGENAssetPurchaseAgreementMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_TypeOfArrangementAxis=CLSN_OperatingLeasesMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_TypeOfArrangementAxis=CLSN_OperatingLeasesMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
</div>
</body>
</html>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>XML
<SEQUENCE>71
<FILENAME>R61.htm
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
<html>
<head>
<title></title>
<link rel="stylesheet" type="text/css" href="report.css">
<script type="text/javascript" src="Show.js">/* Do Not Remove This Comment */</script><script type="text/javascript">
							function toggleNextSibling (e) {
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							} else { e.nextSibling.style.display='none'; }
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</head>
<body>
<span style="display: none;">v3.21.2</span><table class="report" border="0" cellspacing="2" id="idm140561283286728">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Technology Development and Licensing Agreements (Details Narrative) - USD ($)<br></strong></div></th>
<th class="th" colspan="1"></th>
<th class="th" colspan="1">6 Months Ended</th>
</tr>
<tr>
<th class="th"><div>Jan. 18, 2013</div></th>
<th class="th"><div>Jun. 30, 2021</div></th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AccountsNotesAndLoansReceivableLineItems', window );"><strong>Accounts, Notes, Loans and Financing Receivable [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_UpfrontPaymentBeingRecognized', window );">[custom:UpfrontPaymentBeingRecognized]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 5,000,000<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis=CLSN_HisunMember', window );">Hisun [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AccountsNotesAndLoansReceivableLineItems', window );"><strong>Accounts, Notes, Loans and Financing Receivable [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ProceedsFromLicenseFeesReceived', window );">Proceeds from License Fees Received</a></td>
<td class="nump">$ 5,000,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_DeferredRevenue', window );">Deferred Revenue</a></td>
<td class="nump">$ 5,000,000.0<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_CLSN_DeferredRevenueAmortizationPeriod', window );">clsn_DeferredRevenueAmortizationPeriod</a></td>
<td class="text">10 years<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_CLSN_DeferredRevenueAmortizationPeriod">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The amortization period for deferred revenue.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">CLSN_DeferredRevenueAmortizationPeriod</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>CLSN_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:durationItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_CLSN_UpfrontPaymentBeingRecognized">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Upfront Payment, being recognized.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">CLSN_UpfrontPaymentBeingRecognized</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>CLSN_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_AccountsNotesAndLoansReceivableLineItems">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AccountsNotesAndLoansReceivableLineItems</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_DeferredRevenue">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of deferred income and obligation to transfer product and service to customer for which consideration has been received or is receivable.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(5))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_DeferredRevenue</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ProceedsFromLicenseFeesReceived">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Cash received from licensees for license fees during the current period.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 25<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3536-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ProceedsFromLicenseFeesReceived</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis=CLSN_HisunMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis=CLSN_HisunMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
</div>
</body>
</html>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>XML
<SEQUENCE>72
<FILENAME>R62.htm
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
<html>
<head>
<title></title>
<link rel="stylesheet" type="text/css" href="report.css">
<script type="text/javascript" src="Show.js">/* Do Not Remove This Comment */</script><script type="text/javascript">
							function toggleNextSibling (e) {
							if (e.nextSibling.style.display=='none') {
							e.nextSibling.style.display='block';
							} else { e.nextSibling.style.display='none'; }
							}</script>
</head>
<body>
<span style="display: none;">v3.21.2</span><table class="report" border="0" cellspacing="2" id="idm140561288326776">
<tr>
<th class="tl" colspan="1" rowspan="1"><div style="width: 200px;"><strong>Commitments and Contingencies (Details Narrative) - USD ($)<br></strong></div></th>
<th class="th"><div>Oct. 02, 2020</div></th>
<th class="th"><div>Apr. 24, 2020</div></th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CommitmentsAndContingenciesDisclosureAbstract', window );"><strong>Commitments and Contingencies Disclosure [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_LitigationSettlementExpense', window );">Litigation Settlement, Expense</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 187,500<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PaymentsForLegalSettlements', window );">Payments for Legal Settlements</a></td>
<td class="nump">$ 187,500<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_CommitmentsAndContingenciesDisclosureAbstract">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_CommitmentsAndContingenciesDisclosureAbstract</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_LitigationSettlementExpense">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of litigation expense, including but not limited to legal, forensic, accounting, and investigative fees.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_LitigationSettlementExpense</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_PaymentsForLegalSettlements">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The amount of cash paid for the settlement of litigation or for other legal issues during the period.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 25<br> -Subparagraph (g)<br> -URI http://asc.fasb.org/extlink&amp;oid=123570139&amp;loc=d3e3536-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_PaymentsForLegalSettlements</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
</div>
</body>
</html>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EXCEL
<SEQUENCE>73
<FILENAME>Financial_Report.xlsx
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
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end
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
