<SEC-DOCUMENT>0001437749-22-012143.txt : 20220512
<SEC-HEADER>0001437749-22-012143.hdr.sgml : 20220512
<ACCEPTANCE-DATETIME>20220512162350
ACCESSION NUMBER:		0001437749-22-012143
CONFORMED SUBMISSION TYPE:	10-Q
PUBLIC DOCUMENT COUNT:		58
CONFORMED PERIOD OF REPORT:	20220331
FILED AS OF DATE:		20220512
DATE AS OF CHANGE:		20220512

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Diffusion Pharmaceuticals Inc.
		CENTRAL INDEX KEY:			0001053691
		STANDARD INDUSTRIAL CLASSIFICATION:	PHARMACEUTICAL PREPARATIONS [2834]
		IRS NUMBER:				300645032
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		10-Q
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-37942
		FILM NUMBER:		22918187

	BUSINESS ADDRESS:	
		STREET 1:		300 EAST MAIN STREET
		STREET 2:		SUITE 201
		CITY:			CHARLOTTESVILLE
		STATE:			VA
		ZIP:			22902
		BUSINESS PHONE:		(434) 220-0718

	MAIL ADDRESS:	
		STREET 1:		300 EAST MAIN STREET
		STREET 2:		SUITE 201
		CITY:			CHARLOTTESVILLE
		STATE:			VA
		ZIP:			22902

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	RestorGenex Corp
		DATE OF NAME CHANGE:	20140307

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	Stratus Media Group, Inc
		DATE OF NAME CHANGE:	20080722

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	FERIS INTERNATIONAL, INC.
		DATE OF NAME CHANGE:	20080228
</SEC-HEADER>
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<p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: center; margin: 0pt;"><b>UNITED STATES</b></p>
<p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: center; margin: 0pt;"><b>SECURITIES AND EXCHANGE COMMISSION</b></p>
<p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: center; margin: 0pt;"><b>Washington, D.C.</b>&#xa0;&#xa0;<b>20549</b></p>
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<p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: center; margin: 0pt;"><b>FORM <ix:nonNumeric name="dei:DocumentType" contextRef="d_2022-01-01_2022-03-31">10-Q</ix:nonNumeric></b></p>
<table border="0" cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;width:100%;margin-left:auto;margin-right:auto;"><tbody><tr><td style="vertical-align: bottom; width: 2%;">&#xa0;</td><td colspan="2" rowspan="1" style="vertical-align: top; width: 3%;">(Mark one)</td></tr>
<tr><td style="vertical-align: bottom; width: 2%;">&#xa0;</td><td style="vertical-align: top; width: 3%;">&#xa0;</td><td style="vertical-align: top; width: 95%;">&#xa0;</td></tr>
<tr><td style="vertical-align: bottom; width: 2%;">&#xa0;</td><td style="vertical-align: top; width: 3%;"> <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"><ix:nonNumeric name="dei:DocumentQuarterlyReport" format="ixt-sec:boolballotbox" contextRef="d_2022-01-01_2022-03-31">&#x2612;</ix:nonNumeric></p> </td><td style="vertical-align: top; width: 95%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;"><b>QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934</b></p> </td></tr>
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<p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: center; margin: 0pt;"><b>For the quarterly period ended </b><ix:nonNumeric name="dei:DocumentPeriodEndDate" format="ixt:datemonthdayyearen" contextRef="d_2022-01-01_2022-03-31"><b>March</b>&#xa0;<b>31, 2022</b></ix:nonNumeric><b> </b></p>
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<p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: center; margin: 0pt;">For the transition period from ___________ to ______________.</p>
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<p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: center; margin: 0pt;"><b>Commission file number: <ix:nonNumeric name="dei:EntityFileNumber" contextRef="d_2022-01-01_2022-03-31">000-24477</ix:nonNumeric> </b></p>
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<p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: center; margin: 0pt;"><b>DIFFUSION PHARMACEUTICALS INC. </b></p>
<p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: center; margin: 0pt;">(Exact name of registrant as specified in its charter)</p>
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<table border="0" cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;width:100%;margin-left:auto;margin-right:auto;"><tbody><tr><td style="vertical-align:top;width:50.3%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b><ix:nonNumeric name="dei:EntityIncorporationStateCountryCode" format="ixt-sec:stateprovnameen" contextRef="d_2022-01-01_2022-03-31">Delaware</ix:nonNumeric></b></p> </td><td style="vertical-align:top;width:50.3%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b><ix:nonNumeric name="dei:EntityTaxIdentificationNumber" contextRef="d_2022-01-01_2022-03-31">30-0645032</ix:nonNumeric></b></p> </td></tr>
<tr><td style="vertical-align:top;width:50.3%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;">(State of other jurisdiction of incorporation or organization)</p> </td><td style="vertical-align:top;width:50.3%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;">(I.R.S. Employer Identification Number)</p> </td></tr>
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<p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
<p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: center; margin: 0pt;"><b><ix:nonNumeric name="dei:EntityAddressAddressLine1" contextRef="d_2022-01-01_2022-03-31">300 East Main Street, Suite 201</ix:nonNumeric></b></p>
<p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: center; margin: 0pt;"><b><ix:nonNumeric name="dei:EntityAddressCityOrTown" contextRef="d_2022-01-01_2022-03-31">Charlottesville</ix:nonNumeric>, <ix:nonNumeric name="dei:EntityAddressStateOrProvince" contextRef="d_2022-01-01_2022-03-31">VA</ix:nonNumeric> <ix:nonNumeric name="dei:EntityAddressPostalZipCode" contextRef="d_2022-01-01_2022-03-31">22902</ix:nonNumeric></b></p>
<p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: center; margin: 0pt;">(Address of principal executive offices, including zip code)</p>
<p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
<p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: center; margin: 0pt;"><b>(<ix:nonNumeric name="dei:CityAreaCode" contextRef="d_2022-01-01_2022-03-31">434</ix:nonNumeric>) <ix:nonNumeric name="dei:LocalPhoneNumber" contextRef="d_2022-01-01_2022-03-31">220-0718</ix:nonNumeric> </b></p>
<p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: center; margin: 0pt;">(Registrant&#x2019;s telephone number including area code)</p>
<p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
<table border="0" cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;width:100%;margin-left:auto;margin-right:auto;"><tbody><tr><td style="vertical-align: bottom; width: 33%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b><span style="text-decoration: underline; ">Title of Each Class</span></b></p> </td><td style="vertical-align: bottom; width: 34%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b><span style="text-decoration: underline; ">Trading Symbol</span></b></p> </td><td style="vertical-align: bottom; width: 33%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b><span style="text-decoration: underline; ">Name of Each Exchange on Which Registered</span></b></p> </td></tr>
<tr><td style="vertical-align: bottom; width: 33%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><ix:nonNumeric name="dei:Security12bTitle" contextRef="d_2022-01-01_2022-03-31">Common Stock, par value $0.001 per share</ix:nonNumeric></p> </td><td style="vertical-align: bottom; width: 34%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><ix:nonNumeric name="dei:TradingSymbol" contextRef="d_2022-01-01_2022-03-31">DFFN</ix:nonNumeric></p> </td><td style="vertical-align: bottom; width: 33%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;">The <ix:nonNumeric name="dei:SecurityExchangeName" format="ixt-sec:exchnameen" contextRef="d_2022-01-01_2022-03-31">Nasdaq</ix:nonNumeric> Capital Market</p> </td></tr>
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<p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: center; margin: 0pt;">Securities registered pursuant to Section&#xa0;12(g) of the Act:</p>
<p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: center; margin: 0pt;"><b>None</b>&#xa0;</p>
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<p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;text-indent:45pt;">Indicate by check mark whether the registrant: (1)&#xa0;has filed all reports required to be filed by Section&#xa0;13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12&#xa0;months (or for such shorter period that the registrant was required to file such reports), and (2)&#xa0;has been subject to such filing requirements for the past 90&#xa0;days. <ix:nonNumeric name="dei:EntityCurrentReportingStatus" contextRef="d_2022-01-01_2022-03-31">Yes</ix:nonNumeric>&#xa0; &#x2612;&#xa0; No&#xa0; &#x2610;</p>
<p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
<p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;text-indent:45pt;">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 (&#xa7;232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). <ix:nonNumeric name="dei:EntityInteractiveDataCurrent" contextRef="d_2022-01-01_2022-03-31">Yes</ix:nonNumeric>&#xa0; &#x2612;&#xa0; No&#xa0; &#x2610;</p>
<p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
<p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin: 0pt; text-indent: 45pt;">Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reporting company, or an emerging growth company. See the definitions of &#x201c;large accelerated filer,&#x201d; &#x201c;accelerated filer,&#x201d; &#x201c;smaller reporting company,&#x201d; and &#x201c;emerging growth company&#x201d; in Rule 12b-2 of the Exchange Act.</p>
<p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;text-indent:9pt;">&#xa0;</p>
<table border="0" cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;width:100%;margin-left:auto;margin-right:auto;"><tbody><tr><td style="vertical-align: middle; width: 70%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">Large&#xa0;accelerated&#xa0;filer&#xa0;&#x2610;</p> </td><td style="vertical-align: middle; width: 30%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:right;margin:0pt;">Accelerated&#xa0;filer&#xa0;&#x2610;</p> </td></tr>
<tr><td style="vertical-align: middle; width: 70%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;"><ix:nonNumeric name="dei:EntityFilerCategory" format="ixt-sec:entityfilercategoryen" contextRef="d_2022-01-01_2022-03-31">Non-accelerated&#xa0;filer</ix:nonNumeric>&#xa0;&#x2612;</p> </td><td style="vertical-align: middle; width: 30%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:right;margin:0pt;">Smaller&#xa0;reporting&#xa0;company <ix:nonNumeric name="dei:EntitySmallBusiness" format="ixt-sec:boolballotbox" contextRef="d_2022-01-01_2022-03-31">&#x2612;</ix:nonNumeric></p> </td></tr>
<tr><td style="vertical-align: bottom; width: 70%;">&#xa0;</td><td style="vertical-align: middle; width: 30%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:right;margin:0pt;">Emerging growth&#xa0;company&#xa0;<ix:nonNumeric name="dei:EntityEmergingGrowthCompany" format="ixt-sec:boolballotbox" contextRef="d_2022-01-01_2022-03-31">&#x2610;</ix:nonNumeric></p> </td></tr>
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<p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
<p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin: 0pt; text-indent: 45pt;">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. &#x2610;</p>
<p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
<p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;text-indent:45pt;">Indicate by check mark whether the registrant is a shell company (as defined in Rule&#xa0;12b-2 of the Act).Yes&#xa0;<ix:nonNumeric name="dei:EntityShellCompany" format="ixt-sec:boolballotbox" contextRef="d_2022-01-01_2022-03-31">&#x2610;</ix:nonNumeric>&#xa0;&#xa0;&#xa0;No&#xa0;&#x2612;</p>
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<p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin: 0pt; text-indent: 45pt;">The number of shares of common stock outstanding at May 11, 2022 was <ix:nonFraction name="dei:EntityCommonStockSharesOutstanding" scale="0" unitRef="Share" decimals="INF" format="ixt:numdotdecimal" contextRef="i_2022-05-11">2,038,592</ix:nonFraction>&#xa0;shares.</p>
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   <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;text-indent:9pt;"><b>DIFFUSION PHARMACEUTICALS INC. </b></p>
   <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b>FORM 10-Q</b></p>
   <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b>MARCH</b>&#xa0;<b>31, 2022 </b></p>
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   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: center; margin: 0pt;"><b>INDEX</b></p>
   <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
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      <td style="vertical-align:bottom;width:19.5%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:right;margin:0pt;text-indent:9pt;"><span style="text-decoration: underline; ">Page</span></p> </td>
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      <td style="vertical-align:bottom;width:80.5%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">PART I &#x2013;&#xa0;FINANCIAL INFORMATION</p> </td>
      <td style="vertical-align:top;width:19.5%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:right;margin:0pt;">1</p> </td>
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      <td style="vertical-align:bottom;width:80.5%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt 0pt 0pt 12pt;">ITEM 1.&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;FINANCIAL STATEMENTS&#xa0;</p> </td>
      <td style="vertical-align:top;width:19.5%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:right;margin:0pt;">1</p> </td>
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      <td style="vertical-align:bottom;width:80.5%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt 0pt 0pt 12pt;">ITEM 2.&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;MANAGEMENT&#x2019;S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS&#xa0;</p> </td>
      <td style="vertical-align:top;width:19.5%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:right;margin:0pt;">14</p> </td>
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      <td style="vertical-align:top;width:19.5%;">&#xa0;</td>
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     <tr style="background-color: rgb(204, 238, 255);">
      <td style="vertical-align:bottom;width:80.5%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt 0pt 0pt 12pt;">ITEM 3.&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK&#xa0;</p> </td>
      <td style="vertical-align:top;width:19.5%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:right;margin:0pt;">19</p> </td>
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      <td style="vertical-align:top;width:19.5%;">&#xa0;</td>
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      <td style="vertical-align:bottom;width:80.5%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt 0pt 0pt 12pt;">ITEM 4.&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;CONTROLS AND PROCEDURES&#xa0;</p> </td>
      <td style="vertical-align:top;width:19.5%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:right;margin:0pt;">19</p> </td>
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      <td style="vertical-align:bottom;width:80.5%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">PART II &#x2013;&#xa0;OTHER INFORMATION&#xa0;</p> </td>
      <td style="vertical-align:top;width:19.5%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:right;margin:0pt;">20</p> </td>
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      <td style="vertical-align:top;width:19.5%;">&#xa0;</td>
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      <td style="vertical-align:bottom;width:80.5%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt 0pt 0pt 12pt;">ITEM 1.&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;LEGAL PROCEEDINGS&#xa0;&#xa0;</p> </td>
      <td style="vertical-align:top;width:19.5%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:right;margin:0pt;">20</p> </td>
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      <td style="vertical-align:top;width:19.5%;">&#xa0;</td>
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     <tr style="background-color: rgb(204, 238, 255);">
      <td style="vertical-align:bottom;width:80.5%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt 0pt 0pt 12pt;">ITEM 1A.&#xa0;&#xa0;RISK FACTORS&#xa0;</p> </td>
      <td style="vertical-align:top;width:19.5%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:right;margin:0pt;">20</p> </td>
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      <td style="vertical-align:bottom;width:80.5%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt 0pt 0pt 12pt;">ITEM 2.&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS&#xa0;</p> </td>
      <td style="vertical-align:top;width:19.5%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:right;margin:0pt;">20</p> </td>
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      <td style="vertical-align:top;width:19.5%;">&#xa0;</td>
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      <td style="vertical-align:bottom;width:80.5%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt 0pt 0pt 12pt;">ITEM 3.&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;DEFAULTS UPON SENIOR SECURITIES&#xa0;</p> </td>
      <td style="vertical-align:top;width:19.5%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:right;margin:0pt;">21</p> </td>
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      <td style="vertical-align:bottom;width:80.5%;">&#xa0;</td>
      <td style="vertical-align:top;width:19.5%;">&#xa0;</td>
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     <tr style="background-color: rgb(204, 238, 255);">
      <td style="vertical-align:bottom;width:80.5%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt 0pt 0pt 12pt;">ITEM 4.&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;MINE SAFETY DISCLOSURES</p> </td>
      <td style="vertical-align:top;width:19.5%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:right;margin:0pt;">21</p> </td>
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      <td style="vertical-align:bottom;width:80.5%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt 0pt 0pt 12pt;">ITEM 5.&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;OTHER INFORMATION&#xa0;</p> </td>
      <td style="vertical-align:top;width:19.5%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:right;margin:0pt;">21</p> </td>
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      <td style="vertical-align:bottom;width:80.5%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt 0pt 0pt 12pt;">ITEM 6.&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;EXHIBITS</p> </td>
      <td style="vertical-align:top;width:19.5%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:right;margin:0pt;">21</p> </td>
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  <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 36pt;"><b>Note Regarding Company References and Other Defined Terms<sup style="vertical-align:top;line-height:120%;font-size:pt">1</sup></b></p>
  <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
  <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin: 0pt; text-indent: 36pt; text-align: justify;">Unless the context otherwise requires, in this Quarterly Report, (i) references to the &#x201c;Company,&#x201d; &#x201c;we,&#x201d; &#x201c;our,&#x201d; or &#x201c;us&#x201d; refer to Diffusion Pharmaceuticals Inc. and its subsidiaries and (ii) references to &#x201c;common stock&#x201d; refer to the common stock, par value $0.001 per share, of the Company. We have also used several other defined terms in this Quarterly Report, many of which are explained or defined below:</p>
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     <td style="vertical-align: bottom; width: 27%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b>Term</b></p> </td>
     <td style="vertical-align: bottom; width: 73%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b>Definition</b></p> </td>
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     <td style="vertical-align: bottom; width: 27%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">2015 Equity Plan</p> </td>
     <td style="vertical-align: bottom; width: 73%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">Diffusion Pharmaceuticals Inc. 2015 Equity Incentive Plan, as amended</p> </td>
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    <tr style="background-color: rgb(255, 255, 255);">
     <td style="vertical-align: bottom; width: 27%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">401(k) Plan</p> </td>
     <td style="vertical-align: bottom; width: 73%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">Diffusion Pharmaceuticals Inc. 401(k) Defined Contribution Plan</p> </td>
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    <tr style="background-color: rgb(204, 238, 255);">
     <td style="vertical-align: bottom; width: 27%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">Altitude Trial</p> </td>
     <td style="vertical-align: bottom; width: 73%;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin: 0pt;">our Phase 1b clinical trial evaluating TSC in normal healthy volunteers subjected to incremental levels of physical exertion while exposed to hypoxic and hypobaric conditions, or &#x201c;simulated altitude&#x201d;</p> </td>
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     <td style="vertical-align: bottom; width: 27%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">Annual Report</p> </td>
     <td style="vertical-align: bottom; width: 73%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">our Annual Report on Form 10-K for the year ended December 31, 2020, filed with the SEC on March 16, 2021</p> </td>
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     <td style="vertical-align: bottom; width: 27%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">ASC</p> </td>
     <td style="vertical-align: bottom; width: 73%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">Accounting Standard Codification of the FASB</p> </td>
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     <td style="vertical-align: bottom; width: 27%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">ASC 815-40</p> </td>
     <td style="vertical-align: bottom; width: 73%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">ASC 815-40, <i>Derivatives and Hedging, Contracts in an Entity's Own Equity</i></p> </td>
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     <td style="vertical-align: bottom; width: 27%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">CRO</p> </td>
     <td style="vertical-align: bottom; width: 73%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">contract research organization</p> </td>
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     <td style="vertical-align: bottom; width: 27%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">DLCO</p> </td>
     <td style="vertical-align: bottom; width: 73%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">diffusion capacity of lung for carbon monoxide</p> </td>
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     <td style="vertical-align: bottom; width: 27%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">Exchange Act</p> </td>
     <td style="vertical-align: bottom; width: 73%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">Securities Exchange Act of 1934, as amended</p> </td>
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     <td style="vertical-align: bottom; width: 27%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">FASB</p> </td>
     <td style="vertical-align: bottom; width: 73%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">Financial Accounting Standards Board</p> </td>
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     <td style="vertical-align: bottom; width: 27%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">FDA</p> </td>
     <td style="vertical-align: bottom; width: 73%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">U.S. Food and Drug Administration</p> </td>
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     <td style="vertical-align: bottom; width: 27%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">G&amp;A</p> </td>
     <td style="vertical-align: bottom; width: 73%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">general and administrative</p> </td>
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     <td style="vertical-align: bottom; width: 27%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">GAAP</p> </td>
     <td style="vertical-align: bottom; width: 73%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">U.S. generally accepted accounting principles</p> </td>
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     <td style="vertical-align: bottom; width: 27%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">GBM</p> </td>
     <td style="vertical-align: bottom; width: 73%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">glioblastoma multiforme brain cancer</p> </td>
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    <tr style="background-color: rgb(204, 238, 255);">
     <td style="vertical-align: bottom; width: 27%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">Hypoxic Solid Tumor Program</p> </td>
     <td style="vertical-align: bottom; width: 73%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">our ongoing clinical development program to evaluate TSC as an adjunct to standard of care therapy for hypoxic solid tumors, first announced in November 2021</p> </td>
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     <td style="vertical-align: bottom; width: 27%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">ILD</p> </td>
     <td style="vertical-align: bottom; width: 73%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">interstitial lung disease</p> </td>
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    <tr style="background-color: rgb(204, 238, 255);">
     <td style="vertical-align: bottom; width: 27%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">ILD-DLCO Trial</p> </td>
     <td style="vertical-align: bottom; width: 73%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">our ongoing Phase 2a clinical trial evaluating TSC in patients with previously diagnosed ILD who have a baseline DLCO test result that is abnormal using DLCO as a surrogate measure of oxygen transfer efficiency</p> </td>
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     <td style="vertical-align: bottom; width: 27%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">IND</p> </td>
     <td style="vertical-align: bottom; width: 73%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">investigational new drug application</p> </td>
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     <td style="vertical-align: bottom; width: 27%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">IPR&amp;D</p> </td>
     <td style="vertical-align: bottom; width: 73%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">in-process research and development</p> </td>
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     <td style="vertical-align: bottom; width: 27%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">Nasdaq</p> </td>
     <td style="vertical-align: bottom; width: 73%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">Nasdaq Stock Market, LLC</p> </td>
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     <td style="vertical-align: bottom; width: 27%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">Nasdaq Staff</p> </td>
     <td style="vertical-align: bottom; width: 73%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">the staff of the listing qualifications department of Nasdaq</p> </td>
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     <td style="vertical-align: bottom; width: 27%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">NOL</p> </td>
     <td style="vertical-align: bottom; width: 73%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">net operating loss</p> </td>
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     <td style="vertical-align: bottom; width: 27%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">Oxygenation Trials</p> </td>
     <td style="vertical-align: bottom; width: 73%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">collectively, the TCOM Trial, the Altitude Trial, and the ILD-DLCO Trial</p> </td>
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     <td style="vertical-align: bottom; width: 27%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">Planned Phase 2 Hypoxic Tumor Trial</p> </td>
     <td style="vertical-align: bottom; width: 73%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">the first clinical trial in our Hypoxic Solid Tumor Program, which we currently expect to be a Phase 2 clinical trial commencing in the second half of 2022, subject to FDA feedback and the availability of clinical drug supply</p> </td>
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     <td style="vertical-align: bottom; width: 27%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">Quarterly Report</p> </td>
     <td style="vertical-align: bottom; width: 73%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">this Quarterly Report on Form 10-Q</p> </td>
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     <td style="vertical-align: bottom; width: 27%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">R&amp;D</p> </td>
     <td style="vertical-align: bottom; width: 73%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">research and development</p> </td>
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     <td style="vertical-align: bottom; width: 27%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">Regulation S-K</p> </td>
     <td style="vertical-align: bottom; width: 73%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">Regulation S-K promulgated under the Securities Act</p> </td>
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     <td style="vertical-align: bottom; width: 27%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">Reverse Stock Split</p> </td>
     <td style="vertical-align: bottom; width: 73%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">the reclassification and combination of all shares of our common stock outstanding at a ratio of one-for-50 approved by our stockholders at the Special Meeting and effective April 18, 2022</p> </td>
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     <td style="vertical-align: bottom; width: 27%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">SEC</p> </td>
     <td style="vertical-align: bottom; width: 73%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">U.S. Securities and Exchange Commission</p> </td>
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     <td style="vertical-align: bottom; width: 27%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">Series C Certificate</p> </td>
     <td style="vertical-align: bottom; width: 73%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">the Certificate of Designation of Preferences, Rights, and Limitations of the Series C Preferred Stock, filed with the Secretary of State of the State of Delaware on March 18, 2022</p> </td>
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     <td style="vertical-align: bottom; width: 27%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">Series C Preferred Stock</p> </td>
     <td style="vertical-align: bottom; width: 73%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">the Company's previously outstanding Series C Convertible Preferred Stock, par value $0.001 per share</p> </td>
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     <td style="vertical-align: bottom; width: 27%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">Special Meeting</p> </td>
     <td style="vertical-align: bottom; width: 73%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">the special meeting of our stockholders held on April 18, 2022</p> </td>
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     <td style="vertical-align: bottom; width: 27%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">TCOM</p> </td>
     <td style="vertical-align: bottom; width: 73%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">transcutaneous oxygen measurement</p> </td>
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     <td style="vertical-align: bottom; width: 27%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">TCOM Trial</p> </td>
     <td style="vertical-align: bottom; width: 73%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">our Phase 1b clinical trial evaluating the effects of TSC on peripheral tissue oxygenation in healthy normal volunteers using a TCOM device, completed in March 2021</p> </td>
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     <td style="vertical-align: bottom; width: 27%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">TSC</p> </td>
     <td style="vertical-align: bottom; width: 73%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">trans sodium crocetinate</p> </td>
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     <td style="vertical-align: bottom; width: 27%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">U.S.</p> </td>
     <td style="vertical-align: bottom; width: 73%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">United States</p> </td>
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  <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;"><b>Note Regarding Forward-Looking Statements</b></p>
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  <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt;text-indent:36pt;">This Quarterly Report (including, for purposes of this Note Regarding Forward-Looking Statements, any information or documents incorporated herein by reference) includes express and implied forward-looking statements. By their nature, forward-looking statements involve risks and uncertainties because they relate to events, competitive dynamics and industry change, and depend on the economic circumstances that may or may not occur in the future or may occur on longer or shorter timelines than anticipated. Although we believe that we have a reasonable basis for each forward-looking statement contained in this Quarterly Report, we caution you that forward-looking statements are not guarantees of future performance and that our actual results of operations, financial condition, liquidity, and prospects may differ materially from the forward-looking statements contained in this Quarterly Report. In addition, even if our results of operations, financial condition, liquidity, and prospects are consistent with the forward-looking statements contained in this Quarterly Report, they may not be predictive of actual results or reflect unanticipated developments in future periods.</p>
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  <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt;text-indent:36pt;">Forward-looking statements appear in a number of places throughout this Quarterly Report . We may, in some cases, use terms such as &#x201c;believes,&#x201d; &#x201c;estimates,&#x201d; &#x201c;anticipates,&#x201d; &#x201c;expects,&#x201d; &#x201c;plans,&#x201d; &#x201c;intends,&#x201d; &#x201c;may,&#x201d; &#x201c;could,&#x201d; &#x201c;might,&#x201d; &#x201c;will,&#x201d; &#x201c;should,&#x201d; &#x201c;approximately,&#x201d; or other words that convey uncertainty of future events or outcomes to identify these forward-looking statements. Forward-looking statements also include statements regarding our intentions, beliefs, projections, outlook, analyses or expectations concerning, among other things:</p>
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     <td style="width: 18pt;"> <p style="font-family: Times New Roman;font-size: 10pt;font-variant:normal;margin:0pt;">&#x2022;</p> </td>
     <td style="width: auto;"> <p style="font-family: Times New Roman;font-size: 10pt;font-variant:normal;margin:0pt;">the success and timing of our clinical and preclinical studies, including our ability to enroll subjects in our ongoing and planned clinical studies at anticipated rates and our ability to manufacture an adequate amount of drug supply for our studies;</p> </td>
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     <td style="width: 18pt;"> <p style="font-family: Times New Roman;font-size: 10pt;font-variant:normal;margin:0pt;">&#x2022;</p> </td>
     <td style="width: auto;"> <p style="font-family: Times New Roman;font-size: 10pt;font-variant:normal;margin:0pt;">obtaining and maintaining intellectual property protection for our product candidates and our proprietary technology;</p> </td>
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     <td style="width: 18pt;"> <p style="margin: 0pt; text-align: left; font-family: Times New Roman; font-size: 10pt;">&#x2022;</p> </td>
     <td style="width: auto;"> <p style="margin: 0pt; text-align: left; font-family: Times New Roman; font-size: 10pt;">the performance of third parties, including contract research organizations, manufacturers, suppliers, and outside consultants, to whom we outsource certain operational, staff and other functions;</p> </td>
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     <td style="width: 18pt;"> <p style="margin: 0pt; text-align: left; font-family: Times New Roman; font-size: 10pt;">&#x2022;</p> </td>
     <td style="width: auto;"> <p style="margin: 0pt; text-align: left; font-family: Times New Roman; font-size: 10pt;">our ability to obtain additional financing in the future and continue as a going concern;</p> </td>
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     <td style="width: 18pt;"> <p style="margin: 0pt; text-align: justify; font-family: Times New Roman; font-size: 10pt;">&#x2022;</p> </td>
     <td style="width: auto;"> <p style="margin: 0pt; text-align: justify; font-family: Times New Roman; font-size: 10pt;">our ability to obtain and maintain regulatory approval of our product candidates and, if approved, our products, including the labeling under any approval we may obtain;</p> </td>
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     <td style="width: 18pt;"> <p style="font-family: Times New Roman;font-size: 10pt;font-variant:normal;margin:0pt;">&#x2022;</p> </td>
     <td style="width: auto;"> <p style="font-family: Times New Roman;font-size: 10pt;font-variant:normal;margin:0pt;">our plans and ability to develop and commercialize our product candidates and the outcomes of our research and development activities;</p> </td>
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     <td style="width: 18pt;"> <p style="margin: 0pt; text-align: justify; font-family: Times New Roman; font-size: 10pt;">&#x2022;</p> </td>
     <td style="width: auto;"> <p style="margin: 0pt; text-align: justify; font-family: Times New Roman; font-size: 10pt;">our estimates regarding expenses, future revenues, capital requirements, and needs for additional financing;</p> </td>
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     <td style="width: 18pt;"> <p style="margin: 0pt; text-align: justify; font-family: Times New Roman; font-size: 10pt;">&#x2022;</p> </td>
     <td style="width: auto;"> <p style="margin: 0pt; text-align: justify; font-family: Times New Roman; font-size: 10pt;">our failure to recruit or retain key scientific or management personnel or to retain our executive officers;</p> </td>
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     <td style="width: 18pt;"> <p style="font-family: Times New Roman;font-size: 10pt;font-variant:normal;margin:0pt;">&#x2022;</p> </td>
     <td style="width: auto;"> <p style="font-family: Times New Roman;font-size: 10pt;font-variant:normal;margin:0pt;">the accuracy of our estimates of the size and characteristics of the potential markets for our product candidates, the rate and degree of market acceptance of any of our product candidates that may be approved in the future, and our ability to serve those markets;</p> </td>
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     <td style="width: auto;"> <p style="font-family: Times New Roman;font-size: 10pt;font-variant:normal;margin:0pt;">the success of products that are or may become available which also target the potential markets for our product candidates;</p> </td>
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     <td style="width: 18pt;"> <p style="font-family: Times New Roman;font-size: 10pt;font-variant:normal;margin:0pt;">&#x2022;</p> </td>
     <td style="width: auto;"> <p style="font-family: Times New Roman;font-size: 10pt;font-variant:normal;margin:0pt;">our ability to operate our business without infringing the intellectual property rights of others and the potential for others to infringe upon our intellectual property rights;</p> </td>
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     <td style="width: 18pt;"> <p style="font-family: Times New Roman;font-size: 10pt;font-variant:normal;margin:0pt;">&#x2022;</p> </td>
     <td style="width: auto;"> <p style="font-family: Times New Roman;font-size: 10pt;font-variant:normal;text-align:justify;margin:0pt;">any significant breakdown, infiltration, or interruption of our information technology systems and infrastructure;</p> </td>
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     <td style="width: 18pt;"> <p style="font-family: Times New Roman;font-size: 10pt;font-variant:normal;margin:0pt;">&#x2022;</p> </td>
     <td style="width: auto;"> <p style="font-family: Times New Roman;font-size: 10pt;font-variant:normal;margin:0pt;">recently enacted and future legislation related to the healthcare system, including trends towards managed care and healthcare cost containment, the impact of any significant spending reductions or cost controls affecting publicly funded or subsidized healthcare programs, or any replacement, repeal, modification, or invalidation of some or all of the provisions of the Affordable Care Act;</p> </td>
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     <td style="width: auto;"> <p style="font-family: Times New Roman;font-size: 10pt;font-variant:normal;text-align:justify;margin:0pt;">other regulatory developments in the U.S., E.U., and other foreign jurisdictions;</p> </td>
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     <td style="width: auto;"> <p style="font-family: Times New Roman;font-size: 10pt;font-variant:normal;margin:0pt;">our ability to satisfy the continued listing requirements of the NASDAQ Capital Market or any other exchange on which our securities may trade in the future;</p> </td>
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     <td style="width: 18pt;"> <p style="font-family: Times New Roman;font-size: 10pt;font-variant:normal;margin:0pt;">&#x2022;</p> </td>
     <td style="width: auto;"> <p style="font-family: Times New Roman;font-size: 10pt;font-variant:normal;margin:0pt;">uncertainties related to general economic, political, business, industry, and market conditions, including the ongoing COVID-19 pandemic, inflationary pressures, and geopolitical conflicts; and</p> </td>
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     <td style="width: auto;"> <p style="font-family: Times New Roman;font-size: 10pt;font-variant:normal;margin:0pt;">other risks and uncertainties, including those discussed under the heading "Risk Factors" in our Annual Report and elsewhere in our other public filings.</p> </td>
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  <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 36pt;">As a result of these and other factors, known and unknown, actual results could differ materially from our intentions, beliefs, projections, outlook, analyses, or expectations expressed in any forward-looking statements in this Quarterly Report. Accordingly, we cannot assure you that the forward-looking statements contained or incorporated by reference in this Quarterly Report will prove to be accurate or that any such inaccuracy will not be material. You should also understand that it is not possible to predict or identify all such factors, and you should not consider any such list to be a complete set of all potential risks or uncertainties. In light of the foregoing and the significant uncertainties in these forward-looking statements, you should not regard these statements as a representation or warranty by us or any other person that we will achieve our objectives and plans in any specified time frame, or at all. For all forward-looking statements, we claim the protection of the safe harbor for forward-looking statements contained in the Private Securities Litigation Reform Act of 1995.</p>
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  <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 36pt;">Any forward-looking statements that we make in this Quarterly Report speak only as of the date of such statement, and, except as required by applicable law or by the rules and regulations of the SEC, we undertake no obligation to update such statements to reflect events or circumstances after the date of this Quarterly Report or to reflect the occurrence of unanticipated events. Comparisons of current and any prior period results are not intended to express any ongoing or future trends or indications of future performance, unless explicitly expressed as such, and should only be viewed as historical data.</p>
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  <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt;"><b>Note Regarding Stock Splits</b></p>
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  <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 36pt;">Unless the context otherwise requires, in this Quarterly Report, all share and per share amounts related to our common stock give effect to our 1-for-50 reverse stock split effective April 18, 2022.</p>
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  <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;"><b>Note Regarding Trademarks, Trade Names and Service Marks</b></p>
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  <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 36pt;">This Quarterly Report contains certain trademarks, trade names, and service marks of ours, including &#x201c;DIFFUSIO<sub>2</sub>N.&#x201d; All other trade names, trademarks, and service marks appearing in this Quarterly Report are, to the knowledge of Diffusion, the property of their respective owners. To the extent any such terms appear without the trade name, trademark, or service mark notice, such presentation is for convenience only and should not be construed as being used in a descriptive or generic sense.</p>
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  <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;text-indent:9pt;"><b>PART I </b>&#x2013;<b> FINANCIAL INFORMATION</b></p>
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     <td style="vertical-align: top; width: 88%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;"><b>FINANCIAL STATEMENTS</b></p> </td>
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  <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;text-indent:9pt;"><b>Diffusion Pharmaceuticals Inc.</b></p>
  <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;text-indent:9pt;"><b>Consolidated Balance Sheets</b></p>
  <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;text-indent:9pt;"><b>(unaudited)</b></p>
  <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
  <div>
   <table border="0" cellpadding="0" cellspacing="0" class="finTable" style="width: 100%; font-size: 10pt; font-family: Times New Roman; text-indent: 0px;"><tbody><tr style="vertical-align: bottom;"><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td colspan="2" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b><b>March 31,</b></b></p> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b><b>2022</b></b></p> </td><td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td colspan="2" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b><b>December 31,</b></b></p> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b><b>2021</b></b></p> </td><td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"><td style="font-family: Times New Roman; font-size: 10pt; width: 70%;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"><b>Assets</b></p> </td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;"><b>&#xa0;</b></td><td style="font-family: Times New Roman; font-size: 10pt;"><b>&#xa0;</b></td><td style="font-family: Times New Roman; font-size: 10pt;"><b>&#xa0;</b></td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;"><b>&#xa0;</b></td><td style="font-family: Times New Roman; font-size: 10pt;"><b>&#xa0;</b></td><td style="font-family: Times New Roman; font-size: 10pt;"><b>&#xa0;</b></td></tr>
<tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Current assets:</p> </td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt; margin-left: 9pt;">Cash and cash equivalents</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">$</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"><ix:nonFraction id="c84240411" contextRef="i_2022-03-31" unitRef="USD" name="us-gaap:CashAndCashEquivalentsAtCarryingValue" scale="0" format="ixt:numdotdecimal" decimals="INF">9,872,330</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">$</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"><ix:nonFraction id="c84240412" contextRef="i_2021-12-31" unitRef="USD" name="us-gaap:CashAndCashEquivalentsAtCarryingValue" scale="0" format="ixt:numdotdecimal" decimals="INF">37,313,558</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt; margin-left: 9pt;">Marketable securities</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"><ix:nonFraction id="c84240413" contextRef="i_2022-03-31" unitRef="USD" name="us-gaap:MarketableSecuritiesCurrent" scale="0" format="ixt:numdotdecimal" decimals="INF">22,680,303</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;; font-size: 10pt;">&#xa0;</td><td style="width: 12%; font-family: &quot;Times New Roman&quot;; font-size: 10pt; margin-left: 0pt; text-align: right;"><ix:nonFraction id="c84240414" contextRef="i_2021-12-31" unitRef="USD" name="us-gaap:MarketableSecuritiesCurrent" scale="0" format="ixt:zerodash" decimals="INF">&#x2014;</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;; font-size: 10pt; margin-left: 0pt;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt; margin-left: 9pt;">Prepaid expenses, deposits and other current assets</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);">&#xa0;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"><ix:nonFraction id="c84240415" contextRef="i_2022-03-31" unitRef="USD" name="dffn:PrepaidExpensesDepositsAndOtherAssets" scale="0" format="ixt:numdotdecimal" decimals="INF">1,021,496</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);">&#xa0;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"><ix:nonFraction id="c84240416" contextRef="i_2021-12-31" unitRef="USD" name="dffn:PrepaidExpensesDepositsAndOtherAssets" scale="0" format="ixt:numdotdecimal" decimals="INF">510,015</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt; margin-left: 18pt;">Total current assets</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"><ix:nonFraction id="c84240417" contextRef="i_2022-03-31" unitRef="USD" name="us-gaap:AssetsCurrent" scale="0" format="ixt:numdotdecimal" decimals="INF">33,574,129</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"><ix:nonFraction id="c84240418" contextRef="i_2021-12-31" unitRef="USD" name="us-gaap:AssetsCurrent" scale="0" format="ixt:numdotdecimal" decimals="INF">37,823,573</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Other assets</p> </td><td style="width: 1%; font-family: &quot;Times New Roman&quot;; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);">&#xa0;</td><td style="width: 12%; font-family: &quot;Times New Roman&quot;; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0); text-align: right;"><ix:nonFraction id="c84240419" contextRef="i_2022-03-31" unitRef="USD" name="us-gaap:OtherAssetsNoncurrent" scale="0" format="ixt:zerodash" decimals="INF">&#x2014;</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);">&#xa0;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"><ix:nonFraction id="c84240420" contextRef="i_2021-12-31" unitRef="USD" name="us-gaap:OtherAssetsNoncurrent" scale="0" format="ixt:numdotdecimal" decimals="INF">15,578</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt; margin-left: 18pt;">Total assets</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);">$</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"><ix:nonFraction id="c84240421" contextRef="i_2022-03-31" unitRef="USD" name="us-gaap:Assets" scale="0" format="ixt:numdotdecimal" decimals="INF">33,574,129</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);">$</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"><ix:nonFraction id="c84240422" contextRef="i_2021-12-31" unitRef="USD" name="us-gaap:Assets" scale="0" format="ixt:numdotdecimal" decimals="INF">37,839,151</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; margin-left: 0pt;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"><b>Liabilities and Stockholders</b>&#x2019;<b> Equity</b></p> </td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;"><b>&#xa0;</b></td><td style="font-family: Times New Roman; font-size: 10pt;"><b>&#xa0;</b></td><td style="font-family: Times New Roman; font-size: 10pt;"><b>&#xa0;</b></td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;"><b>&#xa0;</b></td><td style="font-family: Times New Roman; font-size: 10pt;"><b>&#xa0;</b></td><td style="font-family: Times New Roman; font-size: 10pt;"><b>&#xa0;</b></td></tr>
<tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Current liabilities:</p> </td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt; margin-left: 9pt;">Accounts payable</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">$</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"><ix:nonFraction id="c84240425" contextRef="i_2022-03-31" unitRef="USD" name="us-gaap:AccountsPayableCurrent" scale="0" format="ixt:numdotdecimal" decimals="INF">813,197</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">$</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"><ix:nonFraction id="c84240426" contextRef="i_2021-12-31" unitRef="USD" name="us-gaap:AccountsPayableCurrent" scale="0" format="ixt:numdotdecimal" decimals="INF">947,495</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt; margin-left: 9pt;">Accrued expenses and other current liabilities</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);">&#xa0;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"><ix:nonFraction id="c84240427" contextRef="i_2022-03-31" unitRef="USD" name="us-gaap:OtherAccruedLiabilitiesCurrent" scale="0" format="ixt:numdotdecimal" decimals="INF">2,142,633</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);">&#xa0;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"><ix:nonFraction id="c84240428" contextRef="i_2021-12-31" unitRef="USD" name="us-gaap:OtherAccruedLiabilitiesCurrent" scale="0" format="ixt:numdotdecimal" decimals="INF">1,980,189</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt; margin-left: 18pt;">Total current liabilities</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"><ix:nonFraction id="c84240429" contextRef="i_2022-03-31" unitRef="USD" name="us-gaap:LiabilitiesCurrent" scale="0" format="ixt:numdotdecimal" decimals="INF">2,955,830</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"><ix:nonFraction id="c84240430" contextRef="i_2021-12-31" unitRef="USD" name="us-gaap:LiabilitiesCurrent" scale="0" format="ixt:numdotdecimal" decimals="INF">2,927,684</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);" class="GFJY4-DFU-com-rdg-thunderdome-client-resources-CssResource-html-lineItem-v2v-addition"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Commitments and Contingencies (Note 9)</p> </td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;<span style="-sec-ix-hidden:c84240432">&#xa0;</span></td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;<span style="-sec-ix-hidden:c84240433">&#xa0;</span></td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Stockholders&#x2019; Equity:</p> </td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt; margin-left: 9pt;">Series C convertible preferred stock, <span style="-sec-ix-hidden:c84240437"><span style="-sec-ix-hidden:c84240438">$0.001</span></span> par value: <span style="-sec-ix-hidden:c84240439"><span style="-sec-ix-hidden:c84240440">10,000</span></span> shares authorized; <span style="-sec-ix-hidden:c84240441"><span style="-sec-ix-hidden:c84240443">10,000</span></span> and <span style="-sec-ix-hidden:c84240442"><span style="-sec-ix-hidden:c84240444">0</span></span> shares issued and outstanding at March 31, 2022 and December 31, 2021, respectively</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"><ix:nonFraction id="c84240435" contextRef="i_2022-03-31_StatementClassOfStockAxis-SeriesCPreferredStockMember" unitRef="USD" name="us-gaap:PreferredStockValue" scale="0" format="ixt:numdotdecimal" decimals="INF">5,000</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;; font-size: 10pt;">&#xa0;</td><td style="width: 12%; font-family: &quot;Times New Roman&quot;; font-size: 10pt; margin-left: 0pt; text-align: right;"><ix:nonFraction id="c84240436" contextRef="i_2021-12-31_StatementClassOfStockAxis-SeriesCPreferredStockMember" unitRef="USD" name="us-gaap:PreferredStockValue" scale="0" format="ixt:zerodash" decimals="INF">&#x2014;</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;; font-size: 10pt; margin-left: 0pt;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt; margin-left: 9pt;">Common stock, <span style="-sec-ix-hidden:c84240449"><span style="-sec-ix-hidden:c84240450">$0.001</span></span> par value: <span style="-sec-ix-hidden:c84240451"><span style="-sec-ix-hidden:c84240452">1,000,000,000</span></span> shares authorized; <span style="-sec-ix-hidden:c84240453"><span style="-sec-ix-hidden:c84240455">2,038,392</span></span> and <span style="-sec-ix-hidden:c84240454"><span style="-sec-ix-hidden:c84240456">2,038,185</span></span> shares issued and outstanding at March 31, 2022 and December 31, 2021, respectively</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"><ix:nonFraction id="c84240445" contextRef="i_2022-03-31" unitRef="USD" name="us-gaap:CommonStockValue" scale="0" format="ixt:numdotdecimal" decimals="INF">2,038</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"><ix:nonFraction id="c84240447" contextRef="i_2021-12-31" unitRef="USD" name="us-gaap:CommonStockValue" scale="0" format="ixt:numdotdecimal" decimals="INF">2,038</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt; margin-left: 9pt;">Additional paid-in capital</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"><ix:nonFraction id="c84240457" contextRef="i_2022-03-31" unitRef="USD" name="us-gaap:AdditionalPaidInCapitalCommonStock" scale="0" format="ixt:numdotdecimal" decimals="INF">165,192,671</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"><ix:nonFraction id="c84240459" contextRef="i_2021-12-31" unitRef="USD" name="us-gaap:AdditionalPaidInCapitalCommonStock" scale="0" format="ixt:numdotdecimal" decimals="INF">164,914,540</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt; margin-left: 9pt;">Accumulated other comprehensive loss</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">(<ix:nonFraction id="c84240461" contextRef="i_2022-03-31" unitRef="USD" name="us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax" scale="0" format="ixt:numdotdecimal" decimals="INF" sign="-">49,658</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">)</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;; font-size: 10pt;">&#xa0;</td><td style="width: 12%; font-family: &quot;Times New Roman&quot;; font-size: 10pt; margin-left: 0pt; text-align: right;"><ix:nonFraction id="c84240463" contextRef="i_2021-12-31" unitRef="USD" name="us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax" scale="0" format="ixt:zerodash" decimals="INF">&#x2014;</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;; font-size: 10pt; margin-left: 0pt;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt; margin-left: 9pt;">Accumulated deficit</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);">&#xa0;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);">(<ix:nonFraction id="c84240465" contextRef="i_2022-03-31" unitRef="USD" name="us-gaap:RetainedEarningsAccumulatedDeficit" scale="0" format="ixt:numdotdecimal" decimals="INF" sign="-">134,531,752</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; padding-bottom: 1px;">)</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);">&#xa0;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);">(<ix:nonFraction id="c84240467" contextRef="i_2021-12-31" unitRef="USD" name="us-gaap:RetainedEarningsAccumulatedDeficit" scale="0" format="ixt:numdotdecimal" decimals="INF" sign="-">130,005,111</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; padding-bottom: 1px;">)</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt; margin-left: 9pt;">Total stockholders' equity</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);">&#xa0;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"><ix:nonFraction id="c84240469" contextRef="i_2022-03-31" unitRef="USD" name="us-gaap:StockholdersEquity" scale="0" format="ixt:numdotdecimal" decimals="INF">30,618,299</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);">&#xa0;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"><ix:nonFraction id="c84240470" contextRef="i_2021-12-31" unitRef="USD" name="us-gaap:StockholdersEquity" scale="0" format="ixt:numdotdecimal" decimals="INF">34,911,467</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Total liabilities and stockholders' equity</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);">$</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"><ix:nonFraction id="c84240471" contextRef="i_2022-03-31" unitRef="USD" name="us-gaap:LiabilitiesAndStockholdersEquity" scale="0" format="ixt:numdotdecimal" decimals="INF">33,574,129</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);">$</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"><ix:nonFraction id="c84240473" contextRef="i_2021-12-31" unitRef="USD" name="us-gaap:LiabilitiesAndStockholdersEquity" scale="0" format="ixt:numdotdecimal" decimals="INF">37,839,151</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; margin-left: 0pt;">&#xa0;</td></tr>
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  <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;text-indent:9pt;">See accompanying notes to unaudited interim consolidated financial statements.</p>
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  <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;text-indent:9pt;"><b>Diffusion Pharmaceuticals Inc.</b></p>
  <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;text-indent:9pt;"><b>Consolidated Statements of Operations and Comprehensive Loss</b></p>
  <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;text-indent:9pt;"><b>(unaudited)</b></p>
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   <table border="0" cellpadding="0" cellspacing="0" class="finTable" style="width: 100%; font-size: 10pt; font-family: Times New Roman; text-indent: 0px;"><tbody><tr style="vertical-align: bottom;"><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td colspan="6" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b><b>Three Months Ended March 31,</b></b></p> </td><td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px;">&#xa0;</td></tr>
<tr style="vertical-align: bottom;"><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td colspan="2" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b><b>2022</b></b></p> </td><td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td colspan="2" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b><b>2021</b></b></p> </td><td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"><td style="font-family: Times New Roman; font-size: 10pt; width: 70%;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Operating expenses:</p> </td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt; margin-left: 9pt;">Research and development</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">$</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"><ix:nonFraction id="c84240482" contextRef="d_2022-01-01_2022-03-31" unitRef="USD" name="us-gaap:ResearchAndDevelopmentExpense" scale="0" format="ixt:numdotdecimal" decimals="INF">2,425,898</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">$</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"><ix:nonFraction id="c84240483" contextRef="d_2021-01-01_2021-03-31" unitRef="USD" name="us-gaap:ResearchAndDevelopmentExpense" scale="0" format="ixt:numdotdecimal" decimals="INF">2,916,378</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt; margin-left: 9pt;">General and administrative</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"><ix:nonFraction id="c84240484" contextRef="d_2022-01-01_2022-03-31" unitRef="USD" name="us-gaap:GeneralAndAdministrativeExpense" scale="0" format="ixt:numdotdecimal" decimals="INF">2,128,552</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"><ix:nonFraction id="c84240485" contextRef="d_2021-01-01_2021-03-31" unitRef="USD" name="us-gaap:GeneralAndAdministrativeExpense" scale="0" format="ixt:numdotdecimal" decimals="INF">1,743,510</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt; margin-left: 9pt;">Depreciation</p> </td><td style="width: 1%; font-family: &quot;Times New Roman&quot;; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);">&#xa0;</td><td style="width: 12%; font-family: &quot;Times New Roman&quot;; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0); text-align: right;"><ix:nonFraction id="c84240486" contextRef="d_2022-01-01_2022-03-31" unitRef="USD" name="us-gaap:DepreciationNonproduction" scale="0" format="ixt:zerodash" decimals="INF">&#x2014;</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);">&#xa0;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"><ix:nonFraction id="c84240487" contextRef="d_2021-01-01_2021-03-31" unitRef="USD" name="us-gaap:DepreciationNonproduction" scale="0" format="ixt:numdotdecimal" decimals="INF">24,447</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt; margin-left: 18pt;">Loss from operations</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"><ix:nonFraction id="c84240488" contextRef="d_2022-01-01_2022-03-31" unitRef="USD" name="us-gaap:OperatingIncomeLoss" scale="0" format="ixt:numdotdecimal" decimals="INF" sign="-">4,554,450</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"><ix:nonFraction id="c84240489" contextRef="d_2021-01-01_2021-03-31" unitRef="USD" name="us-gaap:OperatingIncomeLoss" scale="0" format="ixt:numdotdecimal" decimals="INF" sign="-">4,684,335</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Interest income</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);">&#xa0;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);">(<ix:nonFraction id="c84240490" contextRef="d_2022-01-01_2022-03-31" unitRef="USD" name="us-gaap:InterestIncomeExpenseNonoperatingNet" scale="0" format="ixt:numdotdecimal" decimals="INF">27,809</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; padding-bottom: 1px;">)</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);">&#xa0;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);">(<ix:nonFraction id="c84240491" contextRef="d_2021-01-01_2021-03-31" unitRef="USD" name="us-gaap:InterestIncomeExpenseNonoperatingNet" scale="0" format="ixt:numdotdecimal" decimals="INF">40,416</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; padding-bottom: 1px;">)</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Net loss</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);">$</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);">(<ix:nonFraction id="c84240492" contextRef="d_2022-01-01_2022-03-31" unitRef="USD" name="us-gaap:NetIncomeLoss" scale="0" format="ixt:numdotdecimal" decimals="INF" sign="-">4,526,641</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; padding-bottom: 3px;">)</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);">$</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);">(<ix:nonFraction id="c84240493" contextRef="d_2021-01-01_2021-03-31" unitRef="USD" name="us-gaap:NetIncomeLoss" scale="0" format="ixt:numdotdecimal" decimals="INF" sign="-">4,643,919</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; padding-bottom: 3px;">)</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Per share information:</p> </td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Net loss per share of common stock, basic and diluted</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);">$</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);">(<ix:nonFraction id="c84240495" contextRef="d_2022-01-01_2022-03-31" unitRef="USDPerShare" name="us-gaap:EarningsPerShareBasic" scale="0" format="ixt:numdotdecimal" decimals="INF" sign="-">2.22</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; padding-bottom: 3px;">)</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);">$</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);">(<ix:nonFraction id="c84240496" contextRef="d_2021-01-01_2021-03-31" unitRef="USDPerShare" name="us-gaap:EarningsPerShareBasic" scale="0" format="ixt:numdotdecimal" decimals="INF" sign="-">2.81</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; padding-bottom: 3px;">)</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Weighted average shares outstanding, basic and diluted</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 3px double rgb(0, 0, 0);">&#xa0;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"><ix:nonFraction id="c84240497" contextRef="d_2022-01-01_2022-03-31" unitRef="Share" name="us-gaap:WeightedAverageNumberOfSharesOutstandingBasic" scale="0" format="ixt:numdotdecimal" decimals="INF">2,038,323</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 3px double rgb(0, 0, 0);">&#xa0;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"><ix:nonFraction id="c84240498" contextRef="d_2021-01-01_2021-03-31" unitRef="Share" name="us-gaap:WeightedAverageNumberOfSharesOutstandingBasic" scale="0" format="ixt:numdotdecimal" decimals="INF">1,649,969</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; margin-left: 0pt;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Comprehensive loss:</p> </td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt; margin-left: 9pt;">Net loss</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">$</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">(<ix:nonFraction id="c84240500" contextRef="d_2022-01-01_2022-03-31" unitRef="USD" name="us-gaap:NetIncomeLoss" scale="0" format="ixt:numdotdecimal" decimals="INF" sign="-">4,526,641</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">)</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">$</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">(<ix:nonFraction id="c84240501" contextRef="d_2021-01-01_2021-03-31" unitRef="USD" name="us-gaap:NetIncomeLoss" scale="0" format="ixt:numdotdecimal" decimals="INF" sign="-">4,643,919</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">)</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt; margin-left: 9pt;">Unrealized loss on marketable securities</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);">&#xa0;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);">(<ix:nonFraction id="c84240502" contextRef="d_2022-01-01_2022-03-31" unitRef="USD" name="us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax" scale="0" format="ixt:numdotdecimal" decimals="INF" sign="-">49,658</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; padding-bottom: 1px;">)</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);">&#xa0;</td><td style="width: 12%; font-family: &quot;Times New Roman&quot;; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0); text-align: right;"><ix:nonFraction id="c84240503" contextRef="d_2021-01-01_2021-03-31" unitRef="USD" name="us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax" scale="0" format="ixt:zerodash" decimals="INF">&#x2014;</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Comprehensive loss</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);">$</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);">(<ix:nonFraction id="c84240504" contextRef="d_2022-01-01_2022-03-31" unitRef="USD" name="us-gaap:ComprehensiveIncomeNetOfTax" scale="0" format="ixt:numdotdecimal" decimals="INF" sign="-">4,576,299</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; padding-bottom: 3px;">)</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);">$</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);">(<ix:nonFraction id="c84240505" contextRef="d_2021-01-01_2021-03-31" unitRef="USD" name="us-gaap:ComprehensiveIncomeNetOfTax" scale="0" format="ixt:numdotdecimal" decimals="INF" sign="-">4,643,919</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; padding-bottom: 3px;">)</td></tr>
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  <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;text-indent:9pt;">See accompanying notes to unaudited interim consolidated financial statements.</p>
  <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
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  <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;text-indent:9pt;"><b>Diffusion Pharmaceuticals Inc.</b></p>
  <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;text-indent:9pt;"><b>Consolidated Statements of Stockholders' Equity</b></p>
  <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;text-indent:9pt;"><b>Three Months Ended March 31, 2021 and 2022</b></p>
  <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;text-indent:9pt;"><b>(unaudited)</b></p>
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  <div>
   <table cellpadding="0" cellspacing="0" class="finTable" style="width: 100%; font-size: 9pt; font-family: &quot;Times New Roman&quot;, Times, serif; text-indent: 0px; margin-left: 0pt; margin-right: 0pt;"><tbody><tr style="vertical-align: bottom; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;"><td style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td colspan="6" style="text-align: center; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"> <p style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; font-variant: normal; text-align: center; margin: 0pt;"><b><b>Common Stock</b></b></p> </td><td style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td colspan="2" style="text-align: center; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;"> <p style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; font-variant: normal; text-align: center; margin: 0pt;"><b><b>Additional</b></b></p> <p style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; font-variant: normal; text-align: center; margin: 0pt;"><b><b>Paid-in</b></b></p> </td><td style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td colspan="2" style="text-align: center; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;"> <p style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; font-variant: normal; text-align: center; margin: 0pt;"><b><b>Accumulated</b></b></p> </td><td style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td colspan="2" style="text-align: center; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;"> <p style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; font-variant: normal; text-align: center; margin: 0pt;"><b><b>Total</b></b></p> <p style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; font-variant: normal; text-align: center; margin: 0pt;"><b><b>Stockholders'</b></b></p> </td><td style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;"><td style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td colspan="2" style="text-align: center; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"> <p style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; font-variant: normal; text-align: center; margin: 0pt;"><b><b>Shares</b></b></p> </td><td style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; padding-bottom: 1px;">&#xa0;</td><td style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td colspan="2" style="text-align: center; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"> <p style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; font-variant: normal; text-align: center; margin: 0pt;"><b><b>Amount</b></b></p> </td><td style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; padding-bottom: 1px;">&#xa0;</td><td style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td colspan="2" rowspan="1" style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; border-bottom: 1px solid rgb(0, 0, 0); text-align: center;"><b>Capital</b></td><td style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; padding-bottom: 1px;"><b>&#xa0;</b></td><td style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td colspan="2" rowspan="1" style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; border-bottom: 1px solid rgb(0, 0, 0); text-align: center;"><b>Deficit</b></td><td style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; padding-bottom: 1px;"><b>&#xa0;</b></td><td style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td colspan="2" rowspan="1" style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; border-bottom: 1px solid rgb(0, 0, 0); text-align: center;"><b>Equity</b></td><td style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; padding-bottom: 1px;"><b>&#xa0;</b></td></tr>
<tr style="vertical-align: bottom; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; background-color: rgb(204, 238, 255);"><td style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; width: 40%;"> <p style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Balance at January 1, 2021</p> </td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 9%; text-align: right; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;"><ix:nonFraction id="c84240506" contextRef="i_2020-12-31_StatementEquityComponentsAxis-CommonStockMember" unitRef="Share" name="us-gaap:SharesOutstanding" scale="0" format="ixt:numdotdecimal" decimals="INF">1,280,207</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;">$</td><td style="width: 9%; text-align: right; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;"><ix:nonFraction id="c84240507" contextRef="i_2020-12-31_StatementEquityComponentsAxis-CommonStockMember" unitRef="USD" name="us-gaap:StockholdersEquity" scale="0" format="ixt:numdotdecimal" decimals="INF">1,280</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;">$</td><td style="width: 9%; text-align: right; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;"><ix:nonFraction id="c84240508" contextRef="i_2020-12-31_StatementEquityComponentsAxis-AdditionalPaidInCapitalMember" unitRef="USD" name="us-gaap:StockholdersEquity" scale="0" format="ixt:numdotdecimal" decimals="INF">130,722,286</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;">$</td><td style="width: 9%; text-align: right; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;">(<ix:nonFraction id="c84240509" contextRef="i_2020-12-31_StatementEquityComponentsAxis-RetainedEarningsMember" unitRef="USD" name="us-gaap:StockholdersEquity" scale="0" format="ixt:numdotdecimal" decimals="INF" sign="-">105,909,384</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;">)</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;">$</td><td style="width: 9%; text-align: right; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;"><ix:nonFraction id="c84240510" contextRef="i_2020-12-31" unitRef="USD" name="us-gaap:StockholdersEquity" scale="0" format="ixt:numdotdecimal" decimals="INF">24,814,182</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; background-color: rgb(255, 255, 255);"><td style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;"> <p style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt; margin-left: 9pt;">Sale of common stock</p> </td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 9%; text-align: right; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;"><ix:nonFraction id="c84240511" contextRef="d_2021-01-01_2021-03-31_StatementEquityComponentsAxis-CommonStockMember" unitRef="Share" name="us-gaap:StockIssuedDuringPeriodSharesNewIssues" scale="0" format="ixt:numdotdecimal" decimals="INF">673,171</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 9%; text-align: right; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;"><ix:nonFraction id="c84240512" contextRef="d_2021-01-01_2021-03-31_StatementEquityComponentsAxis-CommonStockMember" unitRef="USD" name="us-gaap:StockIssuedDuringPeriodValueNewIssues" scale="0" format="ixt:numdotdecimal" decimals="INF">673</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;">$</td><td style="width: 9%; text-align: right; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;"><ix:nonFraction id="c84240513" contextRef="d_2021-01-01_2021-03-31_StatementEquityComponentsAxis-AdditionalPaidInCapitalMember" unitRef="USD" name="us-gaap:StockIssuedDuringPeriodValueNewIssues" scale="0" format="ixt:numdotdecimal" decimals="INF">31,093,629</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 9%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt; text-align: right;"><ix:nonFraction id="c84240514" contextRef="d_2021-01-01_2021-03-31_StatementEquityComponentsAxis-RetainedEarningsMember" unitRef="USD" name="us-gaap:StockIssuedDuringPeriodValueNewIssues" scale="0" format="ixt:zerodash" decimals="INF">&#x2014;</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 9%; text-align: right; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;"><ix:nonFraction id="c84240515" contextRef="d_2021-01-01_2021-03-31" unitRef="USD" name="us-gaap:StockIssuedDuringPeriodValueNewIssues" scale="0" format="ixt:numdotdecimal" decimals="INF">31,094,302</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; background-color: rgb(204, 238, 255);"><td style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;"> <p style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt; margin-left: 18pt; text-indent: -9pt;">Issuance of common stock upon exercise of warrants, net of issuance costs</p> </td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 9%; text-align: right; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;"><ix:nonFraction id="c84240516" contextRef="d_2021-01-01_2021-03-31_StatementEquityComponentsAxis-CommonStockMember" unitRef="Share" name="us-gaap:StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities" scale="0" format="ixt:numdotdecimal" decimals="INF">84,600</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 9%; text-align: right; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;"><ix:nonFraction id="c84240517" contextRef="d_2021-01-01_2021-03-31_StatementEquityComponentsAxis-CommonStockMember" unitRef="USD" name="us-gaap:StockIssuedDuringPeriodValueConversionOfConvertibleSecurities" scale="0" format="ixt:numdotdecimal" decimals="INF">85</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 9%; text-align: right; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;"><ix:nonFraction id="c84240518" contextRef="d_2021-01-01_2021-03-31_StatementEquityComponentsAxis-AdditionalPaidInCapitalMember" unitRef="USD" name="us-gaap:StockIssuedDuringPeriodValueConversionOfConvertibleSecurities" scale="0" format="ixt:numdotdecimal" decimals="INF">2,201,365</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 9%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt; text-align: right;"><ix:nonFraction id="c84240519" contextRef="d_2021-01-01_2021-03-31_StatementEquityComponentsAxis-RetainedEarningsMember" unitRef="USD" name="us-gaap:StockIssuedDuringPeriodValueConversionOfConvertibleSecurities" scale="0" format="ixt:zerodash" decimals="INF">&#x2014;</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 9%; text-align: right; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;"><ix:nonFraction id="c84240520" contextRef="d_2021-01-01_2021-03-31" unitRef="USD" name="us-gaap:StockIssuedDuringPeriodValueConversionOfConvertibleSecurities" scale="0" format="ixt:numdotdecimal" decimals="INF">2,201,450</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; background-color: rgb(255, 255, 255);"><td style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;"> <p style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt; margin-left: 9pt;">Stock-based compensation expense</p> </td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 9%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt; text-align: right;"><em style="font: inherit;">&#x2014;</em></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 9%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt; text-align: right;"><ix:nonFraction id="c84240522" contextRef="d_2021-01-01_2021-03-31_StatementEquityComponentsAxis-CommonStockMember" unitRef="USD" name="us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue" scale="0" format="ixt:zerodash" decimals="INF">&#x2014;</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 9%; text-align: right; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;"><ix:nonFraction id="c84240523" contextRef="d_2021-01-01_2021-03-31_StatementEquityComponentsAxis-AdditionalPaidInCapitalMember" unitRef="USD" name="us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue" scale="0" format="ixt:numdotdecimal" decimals="INF">181,280</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 9%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt; text-align: right;"><ix:nonFraction id="c84240524" contextRef="d_2021-01-01_2021-03-31_StatementEquityComponentsAxis-RetainedEarningsMember" unitRef="USD" name="us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue" scale="0" format="ixt:zerodash" decimals="INF">&#x2014;</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 9%; text-align: right; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;"><ix:nonFraction id="c84240525" contextRef="d_2021-01-01_2021-03-31" unitRef="USD" name="us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue" scale="0" format="ixt:numdotdecimal" decimals="INF">181,280</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; background-color: rgb(204, 238, 255);"><td style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;"> <p style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt; margin-left: 9pt;">Net loss</p> </td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; border-bottom: 1px solid rgb(0, 0, 0);">&#xa0;</td><td style="width: 9%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0); text-align: right;"><em style="font: inherit;">&#x2014;</em></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; padding-bottom: 1px; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; border-bottom: 1px solid rgb(0, 0, 0);">&#xa0;</td><td style="width: 9%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0); text-align: right;"><ix:nonFraction id="c84240527" contextRef="d_2021-01-01_2021-03-31_StatementEquityComponentsAxis-CommonStockMember" unitRef="USD" name="us-gaap:NetIncomeLoss" scale="0" format="ixt:zerodash" decimals="INF">&#x2014;</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; padding-bottom: 1px; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; border-bottom: 1px solid rgb(0, 0, 0);">&#xa0;</td><td style="width: 9%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0); text-align: right;"><ix:nonFraction id="c84240528" contextRef="d_2021-01-01_2021-03-31_StatementEquityComponentsAxis-AdditionalPaidInCapitalMember" unitRef="USD" name="us-gaap:NetIncomeLoss" scale="0" format="ixt:zerodash" decimals="INF">&#x2014;</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; padding-bottom: 1px; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; border-bottom: 1px solid rgb(0, 0, 0);">&#xa0;</td><td style="width: 9%; text-align: right; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);">(<ix:nonFraction id="c84240529" contextRef="d_2021-01-01_2021-03-31_StatementEquityComponentsAxis-RetainedEarningsMember" unitRef="USD" name="us-gaap:NetIncomeLoss" scale="0" format="ixt:numdotdecimal" decimals="INF" sign="-">4,643,919</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt; padding-bottom: 1px;">)</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; border-bottom: 1px solid rgb(0, 0, 0);">&#xa0;</td><td style="width: 9%; text-align: right; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);">(<ix:nonFraction id="c84240530" contextRef="d_2021-01-01_2021-03-31" unitRef="USD" name="us-gaap:NetIncomeLoss" scale="0" format="ixt:numdotdecimal" decimals="INF" sign="-">4,643,919</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt; padding-bottom: 1px;">)</td></tr>
<tr style="vertical-align: bottom; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; background-color: rgb(255, 255, 255);"><td style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;"> <p style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Balance at March 31, 2021</p> </td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; border-bottom: 3px double rgb(0, 0, 0);">&#xa0;</td><td style="width: 9%; text-align: right; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"><ix:nonFraction id="c84240531" contextRef="i_2021-03-31_StatementEquityComponentsAxis-CommonStockMember" unitRef="Share" name="us-gaap:SharesOutstanding" scale="0" format="ixt:numdotdecimal" decimals="INF">2,037,978</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; padding-bottom: 3px; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);">$</td><td style="width: 9%; text-align: right; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"><ix:nonFraction id="c84240532" contextRef="i_2021-03-31_StatementEquityComponentsAxis-CommonStockMember" unitRef="USD" name="us-gaap:StockholdersEquity" scale="0" format="ixt:numdotdecimal" decimals="INF">2,038</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; padding-bottom: 3px; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);">$</td><td style="width: 9%; text-align: right; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"><ix:nonFraction id="c84240533" contextRef="i_2021-03-31_StatementEquityComponentsAxis-AdditionalPaidInCapitalMember" unitRef="USD" name="us-gaap:StockholdersEquity" scale="0" format="ixt:numdotdecimal" decimals="INF">164,198,560</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; padding-bottom: 3px; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);">$</td><td style="width: 9%; text-align: right; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);">(<ix:nonFraction id="c84240534" contextRef="i_2021-03-31_StatementEquityComponentsAxis-RetainedEarningsMember" unitRef="USD" name="us-gaap:StockholdersEquity" scale="0" format="ixt:numdotdecimal" decimals="INF" sign="-">110,553,303</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt; padding-bottom: 3px;">)</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);">$</td><td style="width: 9%; text-align: right; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"><ix:nonFraction id="c84240535" contextRef="i_2021-03-31" unitRef="USD" name="us-gaap:StockholdersEquity" scale="0" format="ixt:numdotdecimal" decimals="INF">53,647,295</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; padding-bottom: 3px; margin-left: 0pt;">&#xa0;</td></tr>
</tbody></table>
  </div>
  <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
  <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
  <div>
   <table cellpadding="0" cellspacing="0" class="finTable" style="width: 100%; font-size: 9pt; font-family: &quot;Times New Roman&quot;, Times, serif; text-indent: 0px; margin-left: 0pt; margin-right: 0pt;"><tbody><tr style="vertical-align: bottom; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;"><td style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td colspan="6" style="text-align: center; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"> <p style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; font-variant: normal; text-align: center; margin: 0pt;"><b><b>Series C Convertible</b></b></p> <p style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; font-variant: normal; text-align: center; margin: 0pt;"><b><b>Preferred Stock</b></b></p> </td><td style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td colspan="6" style="text-align: center; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"> <p style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; font-variant: normal; text-align: center; margin: 0pt;"><b><b>Common Stock</b></b></p> </td><td style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td colspan="2" style="text-align: center; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;"> <p style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; font-variant: normal; text-align: center; margin: 0pt;"><b><b>Additional</b></b></p> <p style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; font-variant: normal; text-align: center; margin: 0pt;"><b><b>Paid-in</b></b></p> </td><td style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td colspan="2" style="text-align: center; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;"> <p style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; font-variant: normal; text-align: center; margin: 0pt;"><b><b>Accumulated Other Comprehensive</b></b></p> </td><td style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td colspan="2" style="text-align: center; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt; vertical-align: bottom;"> <p style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; font-variant: normal; text-align: center; margin: 0pt;"><b><b>Accumulated</b></b></p> </td><td style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td colspan="2" style="text-align: center; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;"> <p style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; font-variant: normal; text-align: center; margin: 0pt;"><b><b>Total</b></b></p> <p style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; font-variant: normal; text-align: center; margin: 0pt;"><b><b>Stockholders'</b></b></p> </td><td style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;"><td style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td colspan="2" style="text-align: center; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"> <p style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; font-variant: normal; text-align: center; margin: 0pt;">Shares</p> </td><td style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; border-bottom: 1px solid rgb(0, 0, 0);">&#xa0;</td><td style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; border-bottom: 1px solid rgb(0, 0, 0);">&#xa0;</td><td colspan="2" style="text-align: center; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"> <p style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; font-variant: normal; text-align: center; margin: 0pt;">Amount</p> </td><td style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; padding-bottom: 1px;">&#xa0;</td><td style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td colspan="2" style="text-align: center; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"> <p style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; font-variant: normal; text-align: center; margin: 0pt;"><b><b>Shares</b></b></p> </td><td style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; padding-bottom: 1px; border-bottom: 1px solid rgb(0, 0, 0);">&#xa0;</td><td style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; border-bottom: 1px solid rgb(0, 0, 0);">&#xa0;</td><td colspan="2" style="text-align: center; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"> <p style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; font-variant: normal; text-align: center; margin: 0pt;"><b><b>Amount</b></b></p> </td><td style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; padding-bottom: 1px;">&#xa0;</td><td style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td colspan="2" rowspan="1" style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; border-bottom: 1px solid rgb(0, 0, 0); text-align: center;"><b>Capital</b></td><td style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; padding-bottom: 1px;"><b>&#xa0;</b></td><td style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td colspan="2" rowspan="1" style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; border-bottom: 1px solid rgb(0, 0, 0); text-align: center;"><b>Loss</b></td><td style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; padding-bottom: 1px;"><b>&#xa0;</b></td><td style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td colspan="2" rowspan="1" style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; border-bottom: 1px solid rgb(0, 0, 0); text-align: center;"><b>Deficit</b></td><td style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; padding-bottom: 1px;"><b>&#xa0;</b></td><td style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td colspan="2" rowspan="1" style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; border-bottom: 1px solid rgb(0, 0, 0); text-align: center;"><b>Equity</b></td><td style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; padding-bottom: 1px;"><b>&#xa0;</b></td></tr>
<tr style="vertical-align: bottom; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; background-color: rgb(204, 238, 255);"><td style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; width: 20%;"> <p style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Balance at January 1, 2022</p> </td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 7%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt; text-align: right;"><ix:nonFraction id="c84240536" contextRef="i_2021-12-31_StatementEquityComponentsAxis-PreferredStockMember" unitRef="Share" name="us-gaap:SharesOutstanding" scale="0" format="ixt:zerodash" decimals="INF">&#x2014;</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;">$</td><td style="width: 7%; text-align: right; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;"><ix:nonFraction id="c84240537" contextRef="i_2021-12-31_StatementEquityComponentsAxis-PreferredStockMember" unitRef="USD" name="us-gaap:StockholdersEquity" scale="0" format="ixt:zerodash" decimals="INF">&#x2014;</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 7%; text-align: right; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;"><ix:nonFraction id="c84240538" contextRef="i_2021-12-31_StatementEquityComponentsAxis-CommonStockMember" unitRef="Share" name="us-gaap:SharesOutstanding" scale="0" format="ixt:numdotdecimal" decimals="INF">2,038,185</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;">$</td><td style="width: 7%; text-align: right; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;"><ix:nonFraction id="c84240539" contextRef="i_2021-12-31_StatementEquityComponentsAxis-CommonStockMember" unitRef="USD" name="us-gaap:StockholdersEquity" scale="0" format="ixt:numdotdecimal" decimals="INF">2,038</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;">$</td><td style="width: 7%; text-align: right; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;"><ix:nonFraction id="c84240540" contextRef="i_2021-12-31_StatementEquityComponentsAxis-AdditionalPaidInCapitalMember" unitRef="USD" name="us-gaap:StockholdersEquity" scale="0" format="ixt:numdotdecimal" decimals="INF">164,914,540</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;">$</td><td style="width: 7%; text-align: right; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;"><ix:nonFraction id="c84240541" contextRef="i_2021-12-31_StatementEquityComponentsAxis-AccumulatedOtherComprehensiveIncomeMember" unitRef="USD" name="us-gaap:StockholdersEquity" scale="0" format="ixt:zerodash" decimals="INF">&#x2014;</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;">$</td><td style="width: 7%; text-align: right; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;">(<ix:nonFraction id="c84240542" contextRef="i_2021-12-31_StatementEquityComponentsAxis-RetainedEarningsMember" unitRef="USD" name="us-gaap:StockholdersEquity" scale="0" format="ixt:numdotdecimal" decimals="INF" sign="-">130,005,111</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;">)</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;">$</td><td style="width: 7%; text-align: right; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;"><ix:nonFraction id="c84240543" contextRef="i_2021-12-31" unitRef="USD" name="us-gaap:StockholdersEquity" scale="0" format="ixt:numdotdecimal" decimals="INF">34,911,467</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; background-color: rgb(255, 255, 255);"><td style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;"> <p style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt; margin-left: 9pt;">Sale of series C preferred stock to related parties</p> </td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 7%; text-align: right; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;"><ix:nonFraction id="c84240544" contextRef="d_2022-01-01_2022-03-31_StatementEquityComponentsAxis-PreferredStockMember" unitRef="Share" name="us-gaap:StockIssuedDuringPeriodSharesNewIssues" scale="0" format="ixt:numdotdecimal" decimals="INF">10,000</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 7%; text-align: right; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;"><ix:nonFraction id="c84240545" contextRef="d_2022-01-01_2022-03-31_StatementEquityComponentsAxis-PreferredStockMember" unitRef="USD" name="us-gaap:StockIssuedDuringPeriodValueNewIssues" scale="0" format="ixt:numdotdecimal" decimals="INF">5,000</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 7%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt; text-align: right;"><ix:nonFraction id="c84240546" contextRef="d_2022-01-01_2022-03-31_StatementEquityComponentsAxis-CommonStockMember" unitRef="Share" name="us-gaap:StockIssuedDuringPeriodSharesNewIssues" scale="0" format="ixt:zerodash" decimals="INF">&#x2014;</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 7%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt; text-align: right;"><ix:nonFraction id="c84240547" contextRef="d_2022-01-01_2022-03-31_StatementEquityComponentsAxis-CommonStockMember" unitRef="USD" name="us-gaap:StockIssuedDuringPeriodValueNewIssues" scale="0" format="ixt:zerodash" decimals="INF">&#x2014;</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 7%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt; text-align: right;"><ix:nonFraction id="c84240548" contextRef="d_2022-01-01_2022-03-31_StatementEquityComponentsAxis-AdditionalPaidInCapitalMember" unitRef="USD" name="us-gaap:StockIssuedDuringPeriodValueNewIssues" scale="0" format="ixt:zerodash" decimals="INF">&#x2014;</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 7%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt; text-align: right;"><ix:nonFraction id="c84240549" contextRef="d_2022-01-01_2022-03-31_StatementEquityComponentsAxis-AccumulatedOtherComprehensiveIncomeMember" unitRef="USD" name="us-gaap:StockIssuedDuringPeriodValueNewIssues" scale="0" format="ixt:zerodash" decimals="INF">&#x2014;</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 7%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt; text-align: right;"><ix:nonFraction id="c84240550" contextRef="d_2022-01-01_2022-03-31_StatementEquityComponentsAxis-RetainedEarningsMember" unitRef="USD" name="us-gaap:StockIssuedDuringPeriodValueNewIssues" scale="0" format="ixt:zerodash" decimals="INF">&#x2014;</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 7%; text-align: right; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;"><ix:nonFraction id="c84240551" contextRef="d_2022-01-01_2022-03-31" unitRef="USD" name="us-gaap:StockIssuedDuringPeriodValueNewIssues" scale="0" format="ixt:numdotdecimal" decimals="INF">5,000</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; background-color: rgb(204, 238, 255);"><td style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;"> <p style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt; margin-left: 9pt;">Stock-based compensation expense and vesting of restricted stock units</p> </td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 7%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt; text-align: right;"><ix:nonFraction id="c84240552" contextRef="d_2022-01-01_2022-03-31_StatementEquityComponentsAxis-PreferredStockMember" unitRef="Share" name="us-gaap:StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures" scale="0" format="ixt:zerodash" decimals="INF">&#x2014;</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 7%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt; text-align: right;"><ix:nonFraction id="c84240553" contextRef="d_2022-01-01_2022-03-31_StatementEquityComponentsAxis-PreferredStockMember" unitRef="USD" name="us-gaap:AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition" scale="0" format="ixt:zerodash" decimals="INF">&#x2014;</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 7%; text-align: right; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;"><ix:nonFraction id="c84240554" contextRef="d_2022-01-01_2022-03-31_StatementEquityComponentsAxis-CommonStockMember" unitRef="Share" name="us-gaap:StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures" scale="0" format="ixt:numdotdecimal" decimals="INF">207</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 7%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt; text-align: right;"><ix:nonFraction id="c84240555" contextRef="d_2022-01-01_2022-03-31_StatementEquityComponentsAxis-CommonStockMember" unitRef="USD" name="us-gaap:AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition" scale="0" format="ixt:zerodash" decimals="INF">&#x2014;</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 7%; text-align: right; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;"><ix:nonFraction id="c84240556" contextRef="d_2022-01-01_2022-03-31_StatementEquityComponentsAxis-AdditionalPaidInCapitalMember" unitRef="USD" name="us-gaap:AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition" scale="0" format="ixt:numdotdecimal" decimals="INF">278,131</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 7%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt; text-align: right;"><ix:nonFraction id="c84240557" contextRef="d_2022-01-01_2022-03-31_StatementEquityComponentsAxis-AccumulatedOtherComprehensiveIncomeMember" unitRef="USD" name="us-gaap:AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition" scale="0" format="ixt:zerodash" decimals="INF">&#x2014;</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 7%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt; text-align: right;"><ix:nonFraction id="c84240558" contextRef="d_2022-01-01_2022-03-31_StatementEquityComponentsAxis-RetainedEarningsMember" unitRef="USD" name="us-gaap:AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition" scale="0" format="ixt:zerodash" decimals="INF">&#x2014;</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 7%; text-align: right; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;"><ix:nonFraction id="c84240559" contextRef="d_2022-01-01_2022-03-31" unitRef="USD" name="us-gaap:AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition" scale="0" format="ixt:numdotdecimal" decimals="INF">278,131</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; background-color: rgb(255, 255, 255);"><td style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;"> <p style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt; margin-left: 9pt;">Unrealized loss on marketable securities</p> </td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 7%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt; text-align: right;"><em style="font: inherit;">&#x2014;</em></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 7%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt; text-align: right;"><ix:nonFraction id="c84240561" contextRef="d_2022-01-01_2022-03-31_StatementEquityComponentsAxis-PreferredStockMember" unitRef="USD" name="us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax" scale="0" format="ixt:zerodash" decimals="INF">&#x2014;</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 7%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt; text-align: right;"><em style="font: inherit;">&#x2014;</em></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 7%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt; text-align: right;"><ix:nonFraction id="c84240563" contextRef="d_2022-01-01_2022-03-31_StatementEquityComponentsAxis-CommonStockMember" unitRef="USD" name="us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax" scale="0" format="ixt:zerodash" decimals="INF">&#x2014;</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 7%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt; text-align: right;"><ix:nonFraction id="c84240564" contextRef="d_2022-01-01_2022-03-31_StatementEquityComponentsAxis-AdditionalPaidInCapitalMember" unitRef="USD" name="us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax" scale="0" format="ixt:zerodash" decimals="INF">&#x2014;</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 7%; text-align: right; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;">(<ix:nonFraction id="c84240565" contextRef="d_2022-01-01_2022-03-31_StatementEquityComponentsAxis-AccumulatedOtherComprehensiveIncomeMember" unitRef="USD" name="us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax" scale="0" format="ixt:numdotdecimal" decimals="INF" sign="-">49,658</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;">)</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 7%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt; text-align: right;"><ix:nonFraction id="c84240566" contextRef="d_2022-01-01_2022-03-31_StatementEquityComponentsAxis-RetainedEarningsMember" unitRef="USD" name="us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax" scale="0" format="ixt:zerodash" decimals="INF">&#x2014;</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 7%; text-align: right; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;">(<ix:nonFraction id="c84240567" contextRef="d_2022-01-01_2022-03-31" unitRef="USD" name="us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax" scale="0" format="ixt:numdotdecimal" decimals="INF" sign="-">49,658</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt;">)</td></tr>
<tr style="vertical-align: bottom; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; background-color: rgb(204, 238, 255);"><td style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;"> <p style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt; margin-left: 9pt;">Net loss</p> </td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; border-bottom: 1px solid rgb(0, 0, 0);">&#xa0;</td><td style="width: 7%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0); text-align: right;"><em style="font: inherit;">&#x2014;</em></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; padding-bottom: 1px; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; border-bottom: 1px solid rgb(0, 0, 0);">&#xa0;</td><td style="width: 7%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0); text-align: right;"><ix:nonFraction id="c84240569" contextRef="d_2022-01-01_2022-03-31_StatementEquityComponentsAxis-PreferredStockMember" unitRef="USD" name="us-gaap:NetIncomeLoss" scale="0" format="ixt:zerodash" decimals="INF">&#x2014;</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; padding-bottom: 1px; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; border-bottom: 1px solid rgb(0, 0, 0);">&#xa0;</td><td style="width: 7%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0); text-align: right;"><em style="font: inherit;">&#x2014;</em></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; padding-bottom: 1px; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; border-bottom: 1px solid rgb(0, 0, 0);">&#xa0;</td><td style="width: 7%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0); text-align: right;"><ix:nonFraction id="c84240571" contextRef="d_2022-01-01_2022-03-31_StatementEquityComponentsAxis-CommonStockMember" unitRef="USD" name="us-gaap:NetIncomeLoss" scale="0" format="ixt:zerodash" decimals="INF">&#x2014;</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; padding-bottom: 1px; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; border-bottom: 1px solid rgb(0, 0, 0);">&#xa0;</td><td style="width: 7%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0); text-align: right;"><ix:nonFraction id="c84240572" contextRef="d_2022-01-01_2022-03-31_StatementEquityComponentsAxis-AdditionalPaidInCapitalMember" unitRef="USD" name="us-gaap:NetIncomeLoss" scale="0" format="ixt:zerodash" decimals="INF">&#x2014;</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; padding-bottom: 1px; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; border-bottom: 1px solid rgb(0, 0, 0);">&#xa0;</td><td style="width: 7%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0); text-align: right;"><ix:nonFraction id="c84240573" contextRef="d_2022-01-01_2022-03-31_StatementEquityComponentsAxis-AccumulatedOtherComprehensiveIncomeMember" unitRef="USD" name="us-gaap:NetIncomeLoss" scale="0" format="ixt:zerodash" decimals="INF">&#x2014;</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; padding-bottom: 1px; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; border-bottom: 1px solid rgb(0, 0, 0);">&#xa0;</td><td style="width: 7%; text-align: right; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);">(<ix:nonFraction id="c84240574" contextRef="d_2022-01-01_2022-03-31_StatementEquityComponentsAxis-RetainedEarningsMember" unitRef="USD" name="us-gaap:NetIncomeLoss" scale="0" format="ixt:numdotdecimal" decimals="INF" sign="-">4,526,641</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt; padding-bottom: 1px;">)</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; border-bottom: 1px solid rgb(0, 0, 0);">&#xa0;</td><td style="width: 7%; text-align: right; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);">(<ix:nonFraction id="c84240575" contextRef="d_2022-01-01_2022-03-31" unitRef="USD" name="us-gaap:NetIncomeLoss" scale="0" format="ixt:numdotdecimal" decimals="INF" sign="-">4,526,641</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt; padding-bottom: 1px;">)</td></tr>
<tr style="vertical-align: bottom; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; background-color: rgb(255, 255, 255);"><td style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;"> <p style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Balance at March 31, 2022</p> </td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; border-bottom: 3px double rgb(0, 0, 0);">&#xa0;</td><td style="width: 7%; text-align: right; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"><ix:nonFraction id="c84240576" contextRef="i_2022-03-31_StatementEquityComponentsAxis-PreferredStockMember" unitRef="Share" name="us-gaap:SharesOutstanding" scale="0" format="ixt:numdotdecimal" decimals="INF">10,000</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; padding-bottom: 3px; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);">$</td><td style="width: 7%; text-align: right; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"><ix:nonFraction id="c84240577" contextRef="i_2022-03-31_StatementEquityComponentsAxis-PreferredStockMember" unitRef="USD" name="us-gaap:StockholdersEquity" scale="0" format="ixt:numdotdecimal" decimals="INF">5,000</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; padding-bottom: 3px; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; border-bottom: 3px double rgb(0, 0, 0);">&#xa0;</td><td style="width: 7%; text-align: right; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"><ix:nonFraction id="c84240578" contextRef="i_2022-03-31_StatementEquityComponentsAxis-CommonStockMember" unitRef="Share" name="us-gaap:SharesOutstanding" scale="0" format="ixt:numdotdecimal" decimals="INF">2,038,392</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; padding-bottom: 3px; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);">$</td><td style="width: 7%; text-align: right; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"><ix:nonFraction id="c84240579" contextRef="i_2022-03-31_StatementEquityComponentsAxis-CommonStockMember" unitRef="USD" name="us-gaap:StockholdersEquity" scale="0" format="ixt:numdotdecimal" decimals="INF">2,038</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; padding-bottom: 3px; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);">$</td><td style="width: 7%; text-align: right; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"><ix:nonFraction id="c84240580" contextRef="i_2022-03-31_StatementEquityComponentsAxis-AdditionalPaidInCapitalMember" unitRef="USD" name="us-gaap:StockholdersEquity" scale="0" format="ixt:numdotdecimal" decimals="INF">165,192,671</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; padding-bottom: 3px; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);">$</td><td style="width: 7%; text-align: right; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);">(<ix:nonFraction id="c84240581" contextRef="i_2022-03-31_StatementEquityComponentsAxis-AccumulatedOtherComprehensiveIncomeMember" unitRef="USD" name="us-gaap:StockholdersEquity" scale="0" format="ixt:numdotdecimal" decimals="INF" sign="-">49,658</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt; padding-bottom: 3px;">)</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);">$</td><td style="width: 7%; text-align: right; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);">(<ix:nonFraction id="c84240582" contextRef="i_2022-03-31_StatementEquityComponentsAxis-RetainedEarningsMember" unitRef="USD" name="us-gaap:StockholdersEquity" scale="0" format="ixt:numdotdecimal" decimals="INF" sign="-">134,531,752</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt; padding-bottom: 3px;">)</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);">$</td><td style="width: 7%; text-align: right; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"><ix:nonFraction id="c84240583" contextRef="i_2022-03-31" unitRef="USD" name="us-gaap:StockholdersEquity" scale="0" format="ixt:numdotdecimal" decimals="INF">30,618,299</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 9pt; padding-bottom: 3px; margin-left: 0pt;">&#xa0;</td></tr>
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  <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;text-indent:9pt;">See accompanying notes to unaudited interim consolidated financial statements.</p>
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  <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;text-indent:9pt;"><b>Diffusion Pharmaceuticals Inc.</b></p>
  <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;text-indent:9pt;"><b>Consolidated Statements of Cash Flows</b></p>
  <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;text-indent:9pt;"><b>(unaudited)</b></p>
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   <table border="0" cellpadding="0" cellspacing="0" class="finTable" style="width: 100%; font-size: 10pt; font-family: Times New Roman; text-indent: 0px;"><tbody><tr style="vertical-align: bottom;"><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td colspan="6" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b><b>Three Months Ended March 31,</b></b></p> </td><td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px;">&#xa0;</td></tr>
<tr style="vertical-align: bottom;"><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td colspan="2" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b><b>2022</b></b></p> </td><td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td colspan="2" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b><b>2021</b></b></p> </td><td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"><td style="font-family: Times New Roman; font-size: 10pt; width: 70%;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Operating activities:</p> </td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Net loss</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">$</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">(<ix:nonFraction id="c84240585" contextRef="d_2022-01-01_2022-03-31" unitRef="USD" name="us-gaap:NetIncomeLoss" scale="0" format="ixt:numdotdecimal" decimals="INF" sign="-">4,526,641</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">)</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">$</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">(<ix:nonFraction id="c84240586" contextRef="d_2021-01-01_2021-03-31" unitRef="USD" name="us-gaap:NetIncomeLoss" scale="0" format="ixt:numdotdecimal" decimals="INF" sign="-">4,643,919</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">)</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Adjustments to reconcile net loss to net cash used in operating activities:</p> </td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt; margin-left: 9pt;">Depreciation</p> </td><td style="width: 1%; font-family: &quot;Times New Roman&quot;; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;; font-size: 10pt;">&#xa0;</td><td style="width: 12%; font-family: &quot;Times New Roman&quot;; font-size: 10pt; margin-left: 0pt; text-align: right;"><ix:nonFraction id="c84240588" contextRef="d_2022-01-01_2022-03-31" unitRef="USD" name="us-gaap:Depreciation" scale="0" format="ixt:zerodash" decimals="INF">&#x2014;</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;; font-size: 10pt; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"><ix:nonFraction id="c84240589" contextRef="d_2021-01-01_2021-03-31" unitRef="USD" name="us-gaap:Depreciation" scale="0" format="ixt:numdotdecimal" decimals="INF">24,447</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt; margin-left: 9pt;">Stock-based compensation expense</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"><ix:nonFraction id="c84240590" contextRef="d_2022-01-01_2022-03-31" unitRef="USD" name="us-gaap:ShareBasedCompensation" scale="0" format="ixt:numdotdecimal" decimals="INF">278,131</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"><ix:nonFraction id="c84240591" contextRef="d_2021-01-01_2021-03-31" unitRef="USD" name="us-gaap:ShareBasedCompensation" scale="0" format="ixt:numdotdecimal" decimals="INF">181,280</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt; margin-left: 9pt;">Amortization of premium and discount on marketable securities</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">(<ix:nonFraction id="c84240592" contextRef="d_2022-01-01_2022-03-31" unitRef="USD" name="us-gaap:InvestmentIncomeNetAmortizationOfDiscountAndPremium" scale="0" format="ixt:numdotdecimal" decimals="INF">13,546</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">)</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;; font-size: 10pt;">&#xa0;</td><td style="width: 12%; font-family: &quot;Times New Roman&quot;; font-size: 10pt; margin-left: 0pt; text-align: right;"><ix:nonFraction id="c84240593" contextRef="d_2021-01-01_2021-03-31" unitRef="USD" name="us-gaap:InvestmentIncomeNetAmortizationOfDiscountAndPremium" scale="0" format="ixt:zerodash" decimals="INF" sign="-">&#x2014;</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;; font-size: 10pt; margin-left: 0pt;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt; margin-left: 9pt;">Changes in operating assets and liabilities:</p> </td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt; margin-left: 18pt;">Prepaid expenses, deposits and other assets</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">(<ix:nonFraction id="c84240595" contextRef="d_2022-01-01_2022-03-31" unitRef="USD" name="us-gaap:IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets" scale="0" format="ixt:numdotdecimal" decimals="INF">495,903</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">)</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">(<ix:nonFraction id="c84240596" contextRef="d_2021-01-01_2021-03-31" unitRef="USD" name="us-gaap:IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets" scale="0" format="ixt:numdotdecimal" decimals="INF">417,677</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">)</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt; margin-left: 18pt;">Accounts payable, accrued expenses and other liabilities</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);">&#xa0;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"><ix:nonFraction id="c84240597" contextRef="d_2022-01-01_2022-03-31" unitRef="USD" name="us-gaap:IncreaseDecreaseInAccountsPayableAndAccruedLiabilities" scale="0" format="ixt:numdotdecimal" decimals="INF">28,146</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);">&#xa0;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);">(<ix:nonFraction id="c84240598" contextRef="d_2021-01-01_2021-03-31" unitRef="USD" name="us-gaap:IncreaseDecreaseInAccountsPayableAndAccruedLiabilities" scale="0" format="ixt:numdotdecimal" decimals="INF" sign="-">320,501</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; padding-bottom: 1px;">)</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Net cash used in operating activities</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);">&#xa0;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);">(<ix:nonFraction id="c84240599" contextRef="d_2022-01-01_2022-03-31" unitRef="USD" name="us-gaap:NetCashProvidedByUsedInOperatingActivities" scale="0" format="ixt:numdotdecimal" decimals="INF" sign="-">4,729,813</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; padding-bottom: 1px;">)</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);">&#xa0;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);">(<ix:nonFraction id="c84240600" contextRef="d_2021-01-01_2021-03-31" unitRef="USD" name="us-gaap:NetCashProvidedByUsedInOperatingActivities" scale="0" format="ixt:numdotdecimal" decimals="INF" sign="-">5,176,370</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; padding-bottom: 1px;">)</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"><td>&#xa0;</td><td>&#xa0;</td><td>&#xa0;</td><td>&#xa0;</td><td>&#xa0;</td><td>&#xa0;</td><td>&#xa0;</td><td>&#xa0;</td><td>&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Cash flows used in investing activities:</p> </td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt; margin-left: 9pt;">Purchases of marketable securities</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);">&#xa0;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);">(<ix:nonFraction id="c84240602" contextRef="d_2022-01-01_2022-03-31" unitRef="USD" name="us-gaap:PaymentsToAcquireMarketableSecurities" scale="0" format="ixt:numdotdecimal" decimals="INF">22,716,415</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; padding-bottom: 1px;">)</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);">&#xa0;</td><td style="width: 12%; font-family: &quot;Times New Roman&quot;; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0); text-align: right;"><ix:nonFraction id="c84240603" contextRef="d_2021-01-01_2021-03-31" unitRef="USD" name="us-gaap:PaymentsToAcquireMarketableSecurities" scale="0" format="ixt:zerodash" decimals="INF" sign="-">&#x2014;</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Net cash used in investing activities</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">(<ix:nonFraction id="c84240604" contextRef="d_2022-01-01_2022-03-31" unitRef="USD" name="us-gaap:NetCashProvidedByUsedInInvestingActivities" scale="0" format="ixt:numdotdecimal" decimals="INF" sign="-">22,716,415</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">)</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;; font-size: 10pt;">&#xa0;</td><td style="width: 12%; font-family: &quot;Times New Roman&quot;; font-size: 10pt; margin-left: 0pt; text-align: right;"><ix:nonFraction id="c84240605" contextRef="d_2021-01-01_2021-03-31" unitRef="USD" name="us-gaap:NetCashProvidedByUsedInInvestingActivities" scale="0" format="ixt:zerodash" decimals="INF">&#x2014;</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;; font-size: 10pt; margin-left: 0pt;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"><td>&#xa0;</td><td>&#xa0;</td><td>&#xa0;</td><td>&#xa0;</td><td>&#xa0;</td><td>&#xa0;</td><td>&#xa0;</td><td>&#xa0;</td><td>&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Cash flows provided by financing activities:</p> </td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt; margin-left: 9pt;">Proceeds from the sale of common stock, net of issuance costs</p> </td><td style="width: 1%; font-family: &quot;Times New Roman&quot;; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;; font-size: 10pt;">&#xa0;</td><td style="width: 12%; font-family: &quot;Times New Roman&quot;; font-size: 10pt; margin-left: 0pt; text-align: right;"><ix:nonFraction id="c84240607" contextRef="d_2022-01-01_2022-03-31" unitRef="USD" name="us-gaap:ProceedsFromIssuanceOfCommonStock" scale="0" format="ixt:zerodash" decimals="INF">&#x2014;</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;; font-size: 10pt; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"><ix:nonFraction id="c84240608" contextRef="d_2021-01-01_2021-03-31" unitRef="USD" name="us-gaap:ProceedsFromIssuanceOfCommonStock" scale="0" format="ixt:numdotdecimal" decimals="INF">31,094,302</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt; margin-left: 9pt;">Proceeds received from the exercise of common stock warrants</p> </td><td style="width: 1%; font-family: &quot;Times New Roman&quot;; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;; font-size: 10pt;">&#xa0;</td><td style="width: 12%; font-family: &quot;Times New Roman&quot;; font-size: 10pt; margin-left: 0pt; text-align: right;"><ix:nonFraction id="c84240609" contextRef="d_2022-01-01_2022-03-31" unitRef="USD" name="us-gaap:ProceedsFromWarrantExercises" scale="0" format="ixt:zerodash" decimals="INF">&#x2014;</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;; font-size: 10pt; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"><ix:nonFraction id="c84240610" contextRef="d_2021-01-01_2021-03-31" unitRef="USD" name="us-gaap:ProceedsFromWarrantExercises" scale="0" format="ixt:numdotdecimal" decimals="INF">2,201,450</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt; margin-left: 9pt;">Proceeds from the sale of series C preferred stock to related parties</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);">&#xa0;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"><ix:nonFraction id="c84240611" contextRef="d_2022-01-01_2022-03-31" unitRef="USD" name="us-gaap:ProceedsFromIssuanceOfPreferredStockAndPreferenceStock" scale="0" format="ixt:numdotdecimal" decimals="INF">5,000</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);">&#xa0;</td><td style="width: 12%; font-family: &quot;Times New Roman&quot;; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0); text-align: right;"><ix:nonFraction id="c84240612" contextRef="d_2021-01-01_2021-03-31" unitRef="USD" name="us-gaap:ProceedsFromIssuanceOfPreferredStockAndPreferenceStock" scale="0" format="ixt:zerodash" decimals="INF">&#x2014;</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Net cash provided by financing activities</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);">&#xa0;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"><ix:nonFraction id="c84240613" contextRef="d_2022-01-01_2022-03-31" unitRef="USD" name="us-gaap:NetCashProvidedByUsedInFinancingActivities" scale="0" format="ixt:numdotdecimal" decimals="INF">5,000</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);">&#xa0;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"><ix:nonFraction id="c84240614" contextRef="d_2021-01-01_2021-03-31" unitRef="USD" name="us-gaap:NetCashProvidedByUsedInFinancingActivities" scale="0" format="ixt:numdotdecimal" decimals="INF">33,295,752</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"><td>&#xa0;</td><td>&#xa0;</td><td>&#xa0;</td><td>&#xa0;</td><td>&#xa0;</td><td>&#xa0;</td><td>&#xa0;</td><td>&#xa0;</td><td>&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Net (decrease) increase in cash and cash equivalents</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">(<ix:nonFraction id="c84240615" contextRef="d_2022-01-01_2022-03-31" unitRef="USD" name="us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect" scale="0" format="ixt:numdotdecimal" decimals="INF" sign="-">27,441,228</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">)</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"><ix:nonFraction id="c84240616" contextRef="d_2021-01-01_2021-03-31" unitRef="USD" name="us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect" scale="0" format="ixt:numdotdecimal" decimals="INF">28,119,382</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Cash and cash equivalents at beginning of year</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);">&#xa0;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"><ix:nonFraction id="c84240617" contextRef="i_2021-12-31" unitRef="USD" name="us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations" scale="0" format="ixt:numdotdecimal" decimals="INF">37,313,558</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);">&#xa0;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"><ix:nonFraction id="c84240618" contextRef="i_2020-12-31" unitRef="USD" name="us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations" scale="0" format="ixt:numdotdecimal" decimals="INF">18,515,595</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Cash and cash equivalents at end of period</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);">$</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"><ix:nonFraction id="c84240619" contextRef="i_2022-03-31" unitRef="USD" name="us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations" scale="0" format="ixt:numdotdecimal" decimals="INF">9,872,330</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);">$</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"><ix:nonFraction id="c84240620" contextRef="i_2021-03-31" unitRef="USD" name="us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations" scale="0" format="ixt:numdotdecimal" decimals="INF">46,634,977</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; margin-left: 0pt;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"><td>&#xa0;</td><td>&#xa0;</td><td>&#xa0;</td><td>&#xa0;</td><td>&#xa0;</td><td>&#xa0;</td><td>&#xa0;</td><td>&#xa0;</td><td>&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);" class="GFJY4-DFU-com-rdg-thunderdome-client-resources-CssResource-html-lineItem-v2v-addition"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Supplemental disclosure of non-cash activities:</p> </td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Unrealized loss on marketable securities</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);">$</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"><ix:nonFraction id="c84240622" contextRef="d_2022-01-01_2022-03-31" unitRef="USD" name="us-gaap:MarketableSecuritiesUnrealizedGainLoss" scale="0" format="ixt:numdotdecimal" decimals="INF" sign="-">49,658</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);">$</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"><ix:nonFraction id="c84240623" contextRef="d_2021-01-01_2021-03-31" unitRef="USD" name="us-gaap:MarketableSecuritiesUnrealizedGainLoss" scale="0" format="ixt:zerodash" decimals="INF" sign="-">&#x2014;</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; margin-left: 0pt;">&#xa0;</td></tr>
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  <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;text-indent:9pt;">See accompanying notes to unaudited interim consolidated financial statements.</p>
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  <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt 0pt 0pt 8pt;"><b>DIFFUSION PHARMACEUTICALS INC.</b>&#xa0;</p>
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  <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt 0pt 0pt 8pt;"><b>NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS</b></p>
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  <ix:nonNumeric contextRef="d_2022-01-01_2022-03-31" name="us-gaap:NatureOfOperations" id="c2124493" escape="true">
   <table border="0" cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;width:100%;margin-left:auto;margin-right:auto;"><tbody><tr><td style="vertical-align:top;width:9%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;"><b><em style="font: inherit;">1.</em></b></p> </td><td style="vertical-align:top;width:91.5%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;"><b>Organization and Description of Business</b></p> </td></tr>
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   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">Diffusion Pharmaceuticals Inc., a Delaware corporation, is a biopharmaceutical company developing novel therapies that enhance the body&#x2019;s ability to deliver oxygen to areas where it is needed most. The Company&#x2019;s lead product candidate, TSC, is being developed to enhance the diffusion of oxygen to tissues with low oxygen levels, also known as hypoxia, a serious complication of many of medicine&#x2019;s most intractable and difficult-to-treat conditions, including hypoxic tumors.</p>
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   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">On <em style="font: inherit;"> April 18, 2022, </em>the Company effected a <em style="font: inherit;">1</em>-for-<ix:nonFraction id="c84240626" contextRef="d_2022-04-18_2022-04-18_NonmonetaryTransactionTypeAxis-ReverseStockSplitMember_SubsequentEventTypeAxis-SubsequentEventMember" unitRef="Pure" name="us-gaap:StockholdersEquityNoteStockSplitConversionRatio1" scale="0" format="ixt:numdotdecimal" decimals="INF">50</ix:nonFraction> reverse split of its common stock. Any references in the unaudited condensed consolidated financial statements and related notes to share or per share amounts give retroactive effect to this reverse stock split.</p>
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   <table border="0" cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;width:100%;margin-left:auto;margin-right:auto;"><tbody><tr><td style="vertical-align:top;width:9%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;"><b><em style="font: inherit;">2.</em></b></p> </td><td style="vertical-align:top;width:91.5%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;"><b>Liquidity</b></p> </td></tr>
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   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">The Company has <em style="font: inherit;">not</em> generated any revenues from product sales and has funded operations primarily from the proceeds of public and private offerings of equity, convertible debt and convertible preferred stock. Substantial additional financing will be required by the Company to continue to fund its research and development activities. <em style="font: inherit;">No</em> assurance can be given that any such financing will be available when needed, or at all, or that the Company&#x2019;s research and development efforts will be successful.</p>
   <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">The Company regularly explores alternative means of financing its operations and seeks funding through various sources, including public and private securities offerings, collaborative arrangements with <em style="font: inherit;">third</em> parties and other strategic alliances and business transactions. The Company does <em style="font: inherit;">not</em> have any commitments to obtain additional funds and <em style="font: inherit;"> may </em>be unable to obtain sufficient funding in the future on acceptable terms, if at all. If the Company cannot obtain the necessary funding, it will need to delay, scale back or eliminate some or all of its research and development programs or enter into collaborations with <em style="font: inherit;">third</em> parties to commercialize potential products or technologies that it might otherwise seek to develop or commercialize independently; consider other various strategic alternatives, including a merger or sale of the Company; or cease operations. If the Company engages in collaborations, it <em style="font: inherit;"> may </em>receive lower consideration upon commercialization of such products than if it had <em style="font: inherit;">not</em> entered such arrangements or if it entered into such arrangements at later stages in the product development process.</p>
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   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">Operations of the Company are subject to certain risks and uncertainties including various internal and external factors that will affect whether and when the Company&#x2019;s product candidates become approved drugs and how significant their market share will be, some of which are outside of the Company&#x2019;s control. The length of time and cost of developing and commercializing these product candidates and/or failure of them at any stage of the drug approval process will materially affect the Company&#x2019;s financial condition and future operations. The Company expects that its existing cash, cash equivalents and marketable securities as of <em style="font: inherit;"> March&#xa0;</em><em style="font: inherit;">31,</em> <em style="font: inherit;">2022</em> will enable it to fund its operating expenses and capital expenditure requirements through <em style="font: inherit;">2023.</em></p>
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   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">As of the date of this Quarterly Report, the Summary of Significant Accounting Policies included in the Company's Annual Report have <em style="font: inherit;">not</em> materially changed, except as set forth below.</p>
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   <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt 0pt 0pt 8pt;"><b>DIFFUSION PHARMACEUTICALS INC.</b>&#xa0;</p>
   <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
   <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt 0pt 0pt 8pt;"><b>NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS</b></p>
   <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;text-indent:9pt;">&#xa0;</p></ix:exclude><p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;text-indent:9pt;"></p>
   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin: 0pt; text-indent: 9pt;"><i></i></p><ix:nonNumeric contextRef="d_2022-01-01_2022-03-31" name="us-gaap:BasisOfAccountingPolicyPolicyTextBlock" id="c84241613" escape="true"><p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin: 0pt; text-indent: 9pt;"><i>Basis of Presentation</i></p>
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   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">The accompanying unaudited interim&#xa0;consolidated&#xa0;financial statements of the Company have been prepared in accordance with GAAP for interim financial information as found in the ASC and ASUs of the FASB, and with the instructions to Form <em style="font: inherit;">10</em>-Q and Article <em style="font: inherit;">10</em> of Regulation S-<em style="font: inherit;">X</em> promulgated by the SEC. In the opinion of management, the accompanying&#xa0;unaudited interim consolidated financial statements of the Company include all normal and recurring adjustments (which consist primarily of accruals, estimates and assumptions that impact the unaudited interim consolidated financial statements) considered necessary to present fairly the Company&#x2019;s financial position as of&#xa0;<em style="font: inherit;"> March&#xa0;</em><em style="font: inherit;">31,</em> <em style="font: inherit;">2022,</em> and its results of operations and cash flows for the <em style="font: inherit;">three</em> months ended <em style="font: inherit;"> March&#xa0;</em><em style="font: inherit;">31,</em> <em style="font: inherit;">2022</em> and <em style="font: inherit;">2021.</em> Operating results for the <em style="font: inherit;">three</em> months ended&#xa0;<em style="font: inherit;"> March&#xa0;</em><em style="font: inherit;">31,</em> <em style="font: inherit;">2022</em> are <em style="font: inherit;">not</em> necessarily indicative of the results that <em style="font: inherit;"> may </em>be expected for the year ending <em style="font: inherit;"> December&#xa0;</em><em style="font: inherit;">31,</em> <em style="font: inherit;">2022.</em> The unaudited interim&#xa0;consolidated&#xa0;financial statements presented herein do <em style="font: inherit;">not</em> contain the required disclosures under GAAP for annual financial statements. The accompanying&#xa0;unaudited interim consolidated&#xa0;financial statements should be read in conjunction with the annual audited financial statements and related notes as of and for the year ended <em style="font: inherit;"> December&#xa0;</em><em style="font: inherit;">31,</em> <em style="font: inherit;">2021</em> filed with the SEC as part of the Annual Report.</p>
   <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p></ix:nonNumeric><p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"></p>
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   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">The preparation of financial statements in conformity with GAAP requires the Company to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of expenses during the reporting period.</p>
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   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">On an ongoing basis, the Company evaluates its estimates using historical experience and other factors, including the current economic environment. Significant items subject to such estimates are assumptions used for purposes of determining stock-based compensation and accounting for research and development activities. Management believes its estimates to be reasonable under the circumstances. Actual results could differ significantly from those estimates.</p>
   <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p></ix:nonNumeric><p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"></p>
   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 9pt;"><i></i></p><ix:nonNumeric contextRef="d_2022-01-01_2022-03-31" name="us-gaap:FairValueOfFinancialInstrumentsPolicy" id="c84241615" escape="true"><p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 9pt;"><i>Fair Value of Financial Instruments</i></p>
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   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">The carrying amounts of the Company&#x2019;s financial instruments, including cash equivalents and accounts payable approximate fair value due to the short-term nature of those instruments.&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;</p>
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   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 9pt;"><i></i></p><ix:nonNumeric contextRef="d_2022-01-01_2022-03-31" name="us-gaap:ConcentrationRiskCreditRisk" id="c84241616" escape="true"><p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 9pt;"><i>Concentration of Credit Risk</i></p>
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   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">Financial instruments that potentially expose the Company to concentrations of credit risk consist principally of cash on deposit with multiple financial institutions, the balances of which frequently exceed federally insured limits.</p>
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   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 9pt;"><i></i></p><ix:nonNumeric contextRef="d_2022-01-01_2022-03-31" name="us-gaap:CashAndCashEquivalentsPolicyTextBlock" id="c84241617" escape="true"><p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 9pt;"><i>Cash and Cash Equivalents</i></p>
   <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">The Company considers any highly-liquid investments, such as money market funds and commercial paper with an original maturity of <em style="font: inherit;">three</em> months or less to be cash and cash equivalents.</p>
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   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">The Company classifies its marketable securities as available-for-sale, which include commercial paper and U.S. government debt securities with original maturities of greater than <em style="font: inherit;">three</em> months from date of purchase. The Company considers its marketable securities as available for use in current operations, and therefore classify these securities as current assets on the consolidated balance sheet. These securities are carried at fair market value, with unrealized gains and losses reported in comprehensive loss and accumulated other comprehensive loss within stockholders&#x2019; equity. Gains or losses on marketable securities sold will be based on the specific identification method.</p>
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   <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt 0pt 0pt 8pt;"><b>DIFFUSION PHARMACEUTICALS INC.</b>&#xa0;</p>
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   <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt 0pt 0pt 8pt;"><b>NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS</b></p>
   <p style="font-family: 'Times New Roman', Times, serif; font-size: 10pt; margin: 0pt; text-align: left">&#xa0;</p></ix:exclude><p style="font-family: 'Times New Roman', Times, serif; font-size: 10pt; margin: 0pt; text-align: left"></p>
   <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt;"><i></i></p><ix:nonNumeric contextRef="d_2022-01-01_2022-03-31" name="us-gaap:StockholdersEquityPolicyTextBlock" id="c84241619" escape="true"><p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt;"><i>Reverse Stock Split</i></p>
   <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">On <em style="font: inherit;"> April 18, 2022, </em>the Company filed a Certificate of Amendment to its Certificate of Incorporation, as amended, with the Secretary of State of the State of Delaware to effect the Reverse Stock Split at a ratio of <em style="font: inherit;">1</em>-to-<ix:nonFraction id="c84240684" contextRef="d_2022-04-18_2022-04-18_NonmonetaryTransactionTypeAxis-ReverseStockSplitMember_SubsequentEventTypeAxis-SubsequentEventMember" unitRef="Pure" name="us-gaap:StockholdersEquityNoteStockSplitConversionRatio1" scale="0" format="ixt:numdotdecimal" decimals="INF">50</ix:nonFraction>. <ix:nonFraction id="c84240685" contextRef="d_2022-04-18_2022-04-18_SubsequentEventTypeAxis-SubsequentEventMember" unitRef="Share" name="dffn:StockIssuedDuringPeriodFractionalSharesReverseStockSplit" scale="0" format="ixt-sec:numwordsen" decimals="-3">No</ix:nonFraction> fractional shares were issued in connection with the Reverse Stock Split. Stockholders who otherwise would have been entitled to receive fractional shares of common stock are entitled to receive an amount in cash (without interest or deduction) equal to the fraction of <em style="font: inherit;">one</em> share to which such stockholder would otherwise be entitled multiplied by $<ix:nonFraction id="c84240687" contextRef="d_2022-04-18_2022-04-18_SubsequentEventTypeAxis-SubsequentEventMember" unitRef="USDPerShare" name="dffn:ReverseStockSplitFractionalSharesCashMultiple" scale="0" format="ixt:numdotdecimal" decimals="INF">12.93</ix:nonFraction>, representing the split-adjusted average closing price of the Company&#x2019;s common stock on the Nasdaq Capital Market for the <em style="font: inherit;">five</em> consecutive trading days immediately preceding the effective date of the Reverse Stock Split. Proportional adjustments were made to the Company&#x2019;s outstanding warrants, stock options and other equity securities and to the <em style="font: inherit;">2015</em> Equity Plan to reflect the Reverse Stock Split, in each case, in accordance with the terms thereof. Unless the context otherwise requires, all share and per share amounts in this Quarterly Report have been adjusted to reflect the Reverse Stock Split.</p>
   <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p></ix:nonNumeric><p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"></p>
   <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt;"><i></i></p><ix:nonNumeric contextRef="d_2022-01-01_2022-03-31" name="us-gaap:EarningsPerSharePolicyTextBlock" id="c84241620" escape="true"><p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt;"><i>Net Loss Per Common Share</i></p>
   <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">Basic net loss per share is computed by dividing net loss attributable to common stockholders by the weighted average number of shares of common stock outstanding during each period. Diluted net loss per share includes the effect, if any, from the potential exercise or conversion of securities, such as convertible debt, convertible preferred stock, common stock warrants, stock options and unvested restricted stock that would result in the issuance of incremental shares of common stock. In computing the basic and diluted net loss per share applicable to common stockholders, the weighted average number of shares remains the same for both calculations due to the fact that when a net loss exists, dilutive shares are <em style="font: inherit;">not</em> included in the calculation as the impact is anti-dilutive.</p>
   <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt;text-indent:36pt;">&#xa0;</p>
   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">The following potentially dilutive securities outstanding as of <em style="font: inherit;"> March&#xa0;</em><em style="font: inherit;">31,</em> <em style="font: inherit;">2022</em> and <em style="font: inherit;">2021</em> have been excluded from the computation of diluted weighted average shares outstanding, as they would be anti-dilutive:</p>
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   <ix:nonNumeric contextRef="d_2022-01-01_2022-03-31" name="us-gaap:ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTextBlock" id="c2124496" escape="true">
     <table border="0" cellpadding="0" cellspacing="0" class="finTable" style="width: 100%; font-size: 10pt; font-family: Times New Roman; text-indent: 0px;"><tbody><tr style="vertical-align: bottom;"><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td colspan="6" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b><b>March 31,</b></b></p> </td><td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px;">&#xa0;</td></tr>
<tr style="vertical-align: bottom;"><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td colspan="2" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b><b>2022</b></b></p> </td><td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td colspan="2" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b><b>2021</b></b></p> </td><td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"><td style="font-family: Times New Roman; font-size: 10pt; width: 70%;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Common stock warrants</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"><ix:nonFraction id="c84240711" contextRef="d_2022-01-01_2022-03-31_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis-WarrantMember" unitRef="Share" name="us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount" scale="0" format="ixt:numdotdecimal" decimals="INF">111,891</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"><ix:nonFraction id="c84240712" contextRef="d_2021-01-01_2021-03-31_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis-WarrantMember" unitRef="Share" name="us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount" scale="0" format="ixt:numdotdecimal" decimals="INF">112,963</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Stock options</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"><ix:nonFraction id="c84240713" contextRef="d_2022-01-01_2022-03-31_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis-EmployeeStockOptionMember" unitRef="Share" name="us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount" scale="0" format="ixt:numdotdecimal" decimals="INF">116,564</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"><ix:nonFraction id="c84240714" contextRef="d_2021-01-01_2021-03-31_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis-EmployeeStockOptionMember" unitRef="Share" name="us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount" scale="0" format="ixt:numdotdecimal" decimals="INF">62,336</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Unvested restricted stock awards</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);">&#xa0;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"><ix:nonFraction id="c84240715" contextRef="d_2022-01-01_2022-03-31_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis-RestrictedStockMember" unitRef="Share" name="us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount" scale="0" format="ixt:numdotdecimal" decimals="INF">5,182</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);">&#xa0;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"><ix:nonFraction id="c84240716" contextRef="d_2021-01-01_2021-03-31_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis-RestrictedStockMember" unitRef="Share" name="us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount" scale="0" format="ixt:numdotdecimal" decimals="INF">3,060</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 3px double rgb(0, 0, 0);">&#xa0;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"><ix:nonFraction id="c84240717" contextRef="d_2022-01-01_2022-03-31" unitRef="Share" name="us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount" scale="0" format="ixt:numdotdecimal" decimals="INF">233,637</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 3px double rgb(0, 0, 0);">&#xa0;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"><ix:nonFraction id="c84240718" contextRef="d_2021-01-01_2021-03-31" unitRef="Share" name="us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount" scale="0" format="ixt:numdotdecimal" decimals="INF">178,359</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; margin-left: 0pt;">&#xa0;</td></tr>
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   <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt;"><b><i></i></b></p><ix:nonNumeric contextRef="d_2022-01-01_2022-03-31" name="us-gaap:NewAccountingPronouncementsPolicyPolicyTextBlock" id="c84241621" escape="true"><p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt;"><b><i>Recently Adopted Accounting Pronouncements</i></b></p>
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   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">In <em style="font: inherit;"> June 2016, </em>the FASB issued ASU <em style="font: inherit;">2016</em>-<em style="font: inherit;">13,</em> <i>Financial Instruments</i>&#x2014;<i>Credit Losses, Measurement of Credit Losses on Financial Instruments</i> (Topic <em style="font: inherit;">326</em>). The standard amends the impairment model by requiring entities to use a forward-looking approach based on expected losses to estimate credit losses for most financial assets and certain other instruments that aren&#x2019;t measured at fair value through net income. For available-for-sale debt securities, entities will be required to recognize an allowance for credit losses rather than a reduction in carrying value of the asset. Entities will <em style="font: inherit;">no</em> longer be permitted to consider the length of time that fair value has been less than amortized cost when evaluating when credit losses should be recognized. This new guidance is effective for the Company as of <em style="font: inherit;"> January 1, 2023. </em>The Company is currently evaluating the impact of this ASU but&#xa0;does&#xa0;<em style="font: inherit;">not</em>&#xa0;expect that adoption of this standard will have a material impact on the consolidated financial statements and related disclosures.</p>
   <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p></ix:nonNumeric><p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"></p><ix:exclude><p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"></p>
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       <em style="font: inherit;">7</em>
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   <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt 0pt 0pt 8pt;"><b>DIFFUSION PHARMACEUTICALS INC.</b>&#xa0;</p>
   <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
   <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt 0pt 0pt 8pt;"><b>NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS</b></p></ix:exclude><p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt 0pt 0pt 8pt;"><b></b></p>
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  <ix:nonNumeric contextRef="d_2022-01-01_2022-03-31" name="us-gaap:CashCashEquivalentsAndMarketableSecuritiesTextBlock" id="c2124497" escape="true">
   <table border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt; font-family: &quot;Times New Roman&quot;, Times, serif; width: 100%;"><tbody><tr><td style="width: 9%;"><b><em style="font: inherit;">4.</em></b></td><td style="width: 91%;"><b>Cash, cash equivalents and marketable securities</b></td></tr>
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   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">The following is a summary of the Company's cash and cash equivalents as of the date indicated:</p> &#xa0;
   <ix:nonNumeric contextRef="d_2022-01-01_2022-03-31" name="us-gaap:ScheduleOfCashAndCashEquivalentsTableTextBlock" id="c2124498" escape="true">
    <table border="0" cellpadding="0" cellspacing="0" class="finTable" style="width: 100%; font-size: 10pt; font-family: Times New Roman; text-indent: 0px;"><tbody><tr style="vertical-align: bottom;"><td style="font-family: Times New Roman; font-size: 10pt; width: 66%;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt; width: 1%;">&#xa0;</td><td colspan="2" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0); width: 1%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;">March 31, 2022</p> </td><td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; width: 1%;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt; width: 1%;">&#xa0;</td><td colspan="2" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0); width: 1%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;">December 31, 2021</p> </td><td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; width: 1%;">&#xa0;</td></tr>
<tr style="vertical-align: bottom;"><td style="width: 66%;">&#xa0;</td><td style="width: 1%;">&#xa0;</td><td style="width: 1%;">&#xa0;</td><td style="width: 14%;">&#xa0;</td><td style="width: 1%;">&#xa0;</td><td style="width: 1%;">&#xa0;</td><td style="width: 1%;">&#xa0;</td><td style="width: 14%;">&#xa0;</td><td style="width: 1%;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"><td style="font-family: Times New Roman; font-size: 10pt; width: 66%;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Cash in banking institutions</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">$</td><td style="width: 14%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"><ix:nonFraction id="c84240723" contextRef="i_2022-03-31_CashAndCashEquivalentsAxis-BankTimeDepositsMember" unitRef="USD" name="us-gaap:CashAndCashEquivalentsAtCarryingValue" scale="0" format="ixt:numdotdecimal" decimals="INF">1,326,178</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">$</td><td style="width: 14%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"><ix:nonFraction id="c84240724" contextRef="i_2021-12-31_CashAndCashEquivalentsAxis-BankTimeDepositsMember" unitRef="USD" name="us-gaap:CashAndCashEquivalentsAtCarryingValue" scale="0" format="ixt:numdotdecimal" decimals="INF">30,308,075</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"><td style="font-family: Times New Roman; font-size: 10pt; width: 66%;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Money market funds</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 14%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"><ix:nonFraction id="c84240725" contextRef="i_2022-03-31_CashAndCashEquivalentsAxis-MoneyMarketFundsMember" unitRef="USD" name="us-gaap:CashAndCashEquivalentsAtCarryingValue" scale="0" format="ixt:numdotdecimal" decimals="INF">5,046,607</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 14%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"><ix:nonFraction id="c84240726" contextRef="i_2021-12-31_CashAndCashEquivalentsAxis-MoneyMarketFundsMember" unitRef="USD" name="us-gaap:CashAndCashEquivalentsAtCarryingValue" scale="0" format="ixt:numdotdecimal" decimals="INF">7,005,483</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"><td style="font-family: Times New Roman; font-size: 10pt; width: 66%;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Commercial paper</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);">&#xa0;</td><td style="width: 14%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"><ix:nonFraction id="c84240727" contextRef="i_2022-03-31_CashAndCashEquivalentsAxis-CommercialPaperMember" unitRef="USD" name="us-gaap:CashAndCashEquivalentsAtCarryingValue" scale="0" format="ixt:numdotdecimal" decimals="INF">3,499,545</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);">&#xa0;</td><td style="width: 14%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"><ix:nonFraction id="c84240728" contextRef="i_2021-12-31_CashAndCashEquivalentsAxis-CommercialPaperMember" unitRef="USD" name="us-gaap:CashAndCashEquivalentsAtCarryingValue" scale="0" format="ixt:zerodash" decimals="INF">&#x2014;</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"><td style="font-family: Times New Roman; font-size: 10pt; width: 66%;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Total</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);">$</td><td style="width: 14%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"><ix:nonFraction id="c84240729" contextRef="i_2022-03-31" unitRef="USD" name="us-gaap:CashAndCashEquivalentsAtCarryingValue" scale="0" format="ixt:numdotdecimal" decimals="INF">9,872,330</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);">$</td><td style="width: 14%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"><ix:nonFraction id="c84240730" contextRef="i_2021-12-31" unitRef="USD" name="us-gaap:CashAndCashEquivalentsAtCarryingValue" scale="0" format="ixt:numdotdecimal" decimals="INF">37,313,558</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; margin-left: 0pt;">&#xa0;</td></tr>
</tbody></table>
    <p style="margin: 0pt;">&#xa0;</p>
   </ix:nonNumeric>
   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin: 0pt; text-indent: 45pt; text-align: justify;">The following is a summary of the Company's marketable securities as of <em style="font: inherit;"> March 31, 2022:</em></p>
   <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
   <ix:nonNumeric contextRef="d_2022-01-01_2022-03-31" name="us-gaap:DebtSecuritiesAvailableForSaleTableTextBlock" id="c2124499" escape="true">
    <table border="0" cellpadding="0" cellspacing="0" class="finTable" style="width: 100%; font-size: 10pt; font-family: Times New Roman; text-indent: 0px;"><tbody><tr style="vertical-align: bottom;"><td style="font-family: Times New Roman; font-size: 10pt; width: 32%;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; width: 1%;">&#xa0;</td><td colspan="2" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0); width: 1%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;">Amortized cost</p> </td><td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; width: 1%;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; width: 1%;">&#xa0;</td><td colspan="2" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0); width: 1%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;">Unrealized gains</p> </td><td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; width: 1%;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; width: 1%;">&#xa0;</td><td colspan="2" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0); width: 1%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;">Unrealized losses</p> </td><td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; width: 1%;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; width: 1%;">&#xa0;</td><td colspan="2" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0); width: 1%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;">Fair Value</p> </td><td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; width: 1%;">&#xa0;</td></tr>
<tr style="vertical-align: bottom;"><td style="width: 32%;">&#xa0;</td><td style="width: 1%;">&#xa0;</td><td style="width: 1%;">&#xa0;</td><td style="width: 14%;">&#xa0;</td><td style="width: 1%;">&#xa0;</td><td style="width: 1%;">&#xa0;</td><td style="width: 1%;">&#xa0;</td><td style="width: 14%;">&#xa0;</td><td style="width: 1%;">&#xa0;</td><td style="width: 1%;">&#xa0;</td><td style="width: 1%;">&#xa0;</td><td style="width: 14%;">&#xa0;</td><td style="width: 1%;">&#xa0;</td><td style="width: 1%;">&#xa0;</td><td style="width: 1%;">&#xa0;</td><td style="width: 14%;">&#xa0;</td><td style="width: 1%;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"><td style="font-family: Times New Roman; font-size: 10pt; width: 32%;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Commercial paper</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">$</td><td style="width: 14%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"><ix:nonFraction id="c84240731" contextRef="i_2022-03-31_FinancialInstrumentAxis-CommercialPaperNotIncludedWithCashAndCashEquivalentsMember" unitRef="USD" name="us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis" scale="0" format="ixt:numdotdecimal" decimals="INF">19,716,092</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;; font-size: 10pt;">$</td><td style="width: 14%; font-family: &quot;Times New Roman&quot;; font-size: 10pt; margin-left: 0pt; text-align: right;"><ix:nonFraction id="c84240732" contextRef="i_2022-03-31_FinancialInstrumentAxis-CommercialPaperNotIncludedWithCashAndCashEquivalentsMember" unitRef="USD" name="us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax" scale="0" format="ixt:zerodash" decimals="INF">&#x2014;</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;; font-size: 10pt; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">$</td><td style="width: 14%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">(<ix:nonFraction id="c84240733" contextRef="i_2022-03-31_FinancialInstrumentAxis-CommercialPaperNotIncludedWithCashAndCashEquivalentsMember" unitRef="USD" name="us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax" scale="0" format="ixt:numdotdecimal" decimals="INF">39,939</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">)</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">$</td><td style="width: 14%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"><ix:nonFraction id="c84240734" contextRef="i_2022-03-31_FinancialInstrumentAxis-CommercialPaperNotIncludedWithCashAndCashEquivalentsMember" unitRef="USD" name="us-gaap:AvailableForSaleSecuritiesDebtSecurities" scale="0" format="ixt:numdotdecimal" decimals="INF">19,676,153</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"><td style="font-family: Times New Roman; font-size: 10pt; width: 32%;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">U.S. treasury bonds</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);">&#xa0;</td><td style="width: 14%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"><ix:nonFraction id="c84240735" contextRef="i_2022-03-31_FinancialInstrumentAxis-USTreasurySecuritiesMember" unitRef="USD" name="us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis" scale="0" format="ixt:numdotdecimal" decimals="INF">3,013,869</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);">&#xa0;</td><td style="width: 14%; font-family: &quot;Times New Roman&quot;; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0); text-align: right;"><ix:nonFraction id="c84240736" contextRef="i_2022-03-31_FinancialInstrumentAxis-USTreasurySecuritiesMember" unitRef="USD" name="us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax" scale="0" format="ixt:zerodash" decimals="INF">&#x2014;</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);">&#xa0;</td><td style="width: 14%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);">(<ix:nonFraction id="c84240737" contextRef="i_2022-03-31_FinancialInstrumentAxis-USTreasurySecuritiesMember" unitRef="USD" name="us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax" scale="0" format="ixt:numdotdecimal" decimals="INF">9,719</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; padding-bottom: 1px;">)</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);">&#xa0;</td><td style="width: 14%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"><ix:nonFraction id="c84240738" contextRef="i_2022-03-31_FinancialInstrumentAxis-USTreasurySecuritiesMember" unitRef="USD" name="us-gaap:AvailableForSaleSecuritiesDebtSecurities" scale="0" format="ixt:numdotdecimal" decimals="INF">3,004,150</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"><td style="font-family: Times New Roman; font-size: 10pt; width: 32%;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Total</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);">$</td><td style="width: 14%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"><ix:nonFraction id="c84240739" contextRef="i_2022-03-31" unitRef="USD" name="us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis" scale="0" format="ixt:numdotdecimal" decimals="INF">22,729,961</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;; font-size: 10pt; border-bottom: 3px double rgb(0, 0, 0);">$</td><td style="width: 14%; font-family: &quot;Times New Roman&quot;; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0); text-align: right;"><ix:nonFraction id="c84240740" contextRef="i_2022-03-31" unitRef="USD" name="us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax" scale="0" format="ixt:zerodash" decimals="INF">&#x2014;</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;; font-size: 10pt; padding-bottom: 3px; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);">$</td><td style="width: 14%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);">(<ix:nonFraction id="c84240741" contextRef="i_2022-03-31" unitRef="USD" name="us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax" scale="0" format="ixt:numdotdecimal" decimals="INF">49,658</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; padding-bottom: 3px;">)</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);">$</td><td style="width: 14%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"><ix:nonFraction id="c84240742" contextRef="i_2022-03-31" unitRef="USD" name="us-gaap:AvailableForSaleSecuritiesDebtSecurities" scale="0" format="ixt:numdotdecimal" decimals="INF">22,680,303</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; margin-left: 0pt;">&#xa0;</td></tr>
</tbody></table>
   </ix:nonNumeric>
   <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">The Company did <span style="-sec-ix-hidden:c84240720">not</span> have marketable securities as of <em style="font: inherit;"> December 31, 2021. </em>The Company's marketable securities generally have contractual maturity dates between <ix:nonNumeric contextRef="d_2022-01-01_2022-03-31_RangeAxis-MinimumMember" name="dffn:MarketableSecuritiesContractualMaturity" id="c84240721" format="ixt-sec:durmonth">3</ix:nonNumeric> and <ix:nonNumeric contextRef="d_2022-01-01_2022-03-31_RangeAxis-MaximumMember" name="dffn:MarketableSecuritiesContractualMaturity" id="c84240722" format="ixt-sec:durmonth">12</ix:nonNumeric> months. Most of the Company&#x2019;s marketable securities are in an unrealized loss position at <em style="font: inherit;"> March 31, 2022. </em>Unrealized losses on marketable securities as of <em style="font: inherit;"> March 31, 2022 </em>were <em style="font: inherit;">not</em> significant and were primarily due to changes in interest rates, and <em style="font: inherit;">not</em> due to increased credit risks associated with specific securities. Accordingly, <ix:nonFraction id="c84241387" contextRef="d_2022-01-01_2022-03-31" unitRef="USD" name="dffn:MarketableSecuritiesOtherthantemporaryImpairmentLoss" scale="0" format="ixt-sec:numwordsen" decimals="-3">no</ix:nonFraction> other-than-temporary impairment was recorded for the <em style="font: inherit;">three</em> months ended <em style="font: inherit;"> March 31, 2022 </em>and there were <ix:nonFraction id="c84241389" contextRef="d_2022-01-01_2022-03-31" unitRef="USD" name="us-gaap:MarketableSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairments" scale="0" format="ixt-sec:numwordsen" decimals="-3">no</ix:nonFraction> realized gains or losses recorded during the <em style="font: inherit;">three</em> months ended <em style="font: inherit;"> March 31, 2022.</em></p>
  </ix:nonNumeric>
  <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
  <div>
    &#xa0;
  </div>
  <ix:nonNumeric contextRef="d_2022-01-01_2022-03-31" name="us-gaap:FairValueDisclosuresTextBlock" id="c2124500" escape="true">
   <table border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt; font-family: &quot;Times New Roman&quot;, Times, serif; width: 100%;"><tbody><tr><td style="width: 9%;"><b><em style="font: inherit;">5.</em></b></td><td style="width: 91%;"><b>Fair Value of Financial Instruments</b></td></tr>
</tbody></table>
   <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">Fair value is the price that could be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. Fair value determination in accordance with applicable accounting guidance requires that a number of significant judgments be made. Additionally, fair value is used on a nonrecurring basis to evaluate assets for impairment or as required for disclosure purposes by applicable accounting guidance on disclosures about fair value of financial instruments. Depending on the nature of the assets and liabilities, various valuation techniques and assumptions are used when estimating fair value. The carrying amounts of certain of the Company&#x2019;s financial instruments, including prepaid expense and accounts payable are shown at cost, which approximates fair value due to the short-term nature of these instruments. The Company follows the provisions of FASB ASC Topic <em style="font: inherit;">820,</em> <i>Fair Value Measurement</i>, for financial assets and liabilities measured on a recurring basis. The guidance requires fair value measurements be classified and disclosed in <em style="font: inherit;">one</em> of the following <em style="font: inherit;">three</em> categories:</p>
   <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
   <table border="0" cellpadding="0" cellspacing="0" style="width:100%;font-family:Times New Roman;font-size:10pt;"><tbody><tr><td style="width:18pt;">&#xa0;</td><td style="vertical-align:top;width:18pt;"> <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#x2022;</p> </td><td style="vertical-align:top;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">Level <em style="font: inherit;">1:</em> Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities.</p> </td></tr>
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   <table border="0" cellpadding="0" cellspacing="0" style="width:100%;font-family:Times New Roman;font-size:10pt;"><tbody><tr><td style="width:18pt;">&#xa0;</td><td style="vertical-align:top;width:18pt;"> <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#x2022;</p> </td><td style="vertical-align:top;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">Level <em style="font: inherit;">2:</em> Quoted prices in markets that are <em style="font: inherit;">not</em> active, or inputs which are observable, either directly or indirectly, for substantially the full term of the asset or liabilities.</p> </td></tr>
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   <table border="0" cellpadding="0" cellspacing="0" style="width:100%;font-family:Times New Roman;font-size:10pt;"><tbody><tr><td style="width:18pt;">&#xa0;</td><td style="vertical-align:top;width:18pt;"> <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#x2022;</p> </td><td style="vertical-align:top;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">Level <em style="font: inherit;">3:</em> Prices or valuation techniques that require inputs that are both significant to the fair value measurement and unobservable (i.e., supported by little or <em style="font: inherit;">no</em> market activity).</p> </td></tr>
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   <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt 0pt 0pt 8pt;"><b>DIFFUSION PHARMACEUTICALS INC.</b>&#xa0;</p>
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   <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt 0pt 0pt 8pt;"><b>NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS</b></p>
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   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin: 0pt; text-indent: 45pt; text-align: justify;">The following table presents the Company&#x2019;s assets that are measured at fair value on a recurring basis (amounts in thousands):</p>
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    <table border="0" cellpadding="0" cellspacing="0" class="finTable" style="width: 100%; font-size: 10pt; font-family: Times New Roman; text-indent: 0px;"><tbody><tr style="vertical-align: bottom;"><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px;">&#xa0;</td><td colspan="10" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b><b>Fair value measurement at reporting date</b></b></p> </td><td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px;">&#xa0;</td></tr>
<tr style="vertical-align: bottom;"><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td colspan="2" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b><b>Quoted prices in</b></b></p> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b><b>active markets for</b></b></p> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b><b>identical assets</b></b></p> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b><b>(Level</b> <b>1)</b></b></p> </td><td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td colspan="2" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b><b>Significant other</b></b></p> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b><b>observable inputs</b></b></p> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b><b>(Level</b> <b>2)</b></b></p> </td><td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td colspan="2" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b><b>Significant</b></b></p> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b><b>unobservable inputs</b></b></p> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b><b>(Level</b> <b>3)</b></b></p> </td><td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"><td style="font-family: Times New Roman; font-size: 10pt; width: 43%;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"><b>March 31, 2022:</b></p> </td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;"><b>&#xa0;</b></td><td style="font-family: Times New Roman; font-size: 10pt;"><b>&#xa0;</b></td><td style="font-family: Times New Roman; font-size: 10pt;"><b>&#xa0;</b></td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;"><b>&#xa0;</b></td><td style="font-family: Times New Roman; font-size: 10pt;"><b>&#xa0;</b></td><td style="font-family: Times New Roman; font-size: 10pt;"><b>&#xa0;</b></td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;"><b>&#xa0;</b></td><td style="font-family: Times New Roman; font-size: 10pt;"><b>&#xa0;</b></td><td style="font-family: Times New Roman; font-size: 10pt;"><b>&#xa0;</b></td></tr>
<tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Cash equivalents:</p> </td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt; margin-left: 9pt;">Money market funds</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">$</td><td style="width: 16%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"><ix:nonFraction id="c84240757" contextRef="i_2022-03-31_CashAndCashEquivalentsAxis-MoneyMarketFundsMember_FairValueByFairValueHierarchyLevelAxis-FairValueInputsLevel1Member_FairValueByMeasurementFrequencyAxis-FairValueMeasurementsRecurringMember" unitRef="USD" name="us-gaap:CashAndCashEquivalentsFairValueDisclosure" scale="0" format="ixt:numdotdecimal" decimals="INF">5,046,607</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">$</td><td style="width: 16%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"><ix:nonFraction id="c84240758" contextRef="i_2022-03-31_CashAndCashEquivalentsAxis-MoneyMarketFundsMember_FairValueByFairValueHierarchyLevelAxis-FairValueInputsLevel2Member_FairValueByMeasurementFrequencyAxis-FairValueMeasurementsRecurringMember" unitRef="USD" name="us-gaap:CashAndCashEquivalentsFairValueDisclosure" scale="0" format="ixt:zerodash" decimals="INF">&#x2014;</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">$</td><td style="width: 16%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"><ix:nonFraction id="c84240759" contextRef="i_2022-03-31_CashAndCashEquivalentsAxis-MoneyMarketFundsMember_FairValueByFairValueHierarchyLevelAxis-FairValueInputsLevel3Member_FairValueByMeasurementFrequencyAxis-FairValueMeasurementsRecurringMember" unitRef="USD" name="us-gaap:CashAndCashEquivalentsFairValueDisclosure" scale="0" format="ixt:zerodash" decimals="INF">&#x2014;</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt; margin-left: 9pt;">Commercial paper</p> </td><td style="width: 1%; font-family: &quot;Times New Roman&quot;; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);">&#xa0;</td><td style="width: 16%; font-family: &quot;Times New Roman&quot;; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0); text-align: right;"><ix:nonFraction id="c84240760" contextRef="i_2022-03-31_CashAndCashEquivalentsAxis-CommercialPaperMember_FairValueByFairValueHierarchyLevelAxis-FairValueInputsLevel1Member_FairValueByMeasurementFrequencyAxis-FairValueMeasurementsRecurringMember" unitRef="USD" name="us-gaap:CashAndCashEquivalentsFairValueDisclosure" scale="0" format="ixt:zerodash" decimals="INF">&#x2014;</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);">&#xa0;</td><td style="width: 16%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"><ix:nonFraction id="c84240761" contextRef="i_2022-03-31_CashAndCashEquivalentsAxis-CommercialPaperMember_FairValueByFairValueHierarchyLevelAxis-FairValueInputsLevel2Member_FairValueByMeasurementFrequencyAxis-FairValueMeasurementsRecurringMember" unitRef="USD" name="us-gaap:CashAndCashEquivalentsFairValueDisclosure" scale="0" format="ixt:numdotdecimal" decimals="INF">3,499,545</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);">&#xa0;</td><td style="width: 16%; font-family: &quot;Times New Roman&quot;; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0); text-align: right;"><ix:nonFraction id="c84240762" contextRef="i_2022-03-31_CashAndCashEquivalentsAxis-CommercialPaperMember_FairValueByFairValueHierarchyLevelAxis-FairValueInputsLevel3Member_FairValueByMeasurementFrequencyAxis-FairValueMeasurementsRecurringMember" unitRef="USD" name="us-gaap:CashAndCashEquivalentsFairValueDisclosure" scale="0" format="ixt:zerodash" decimals="INF">&#x2014;</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Total cash and cash equivalents</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);">$</td><td style="width: 16%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"><ix:nonFraction id="c84240763" contextRef="i_2022-03-31_FairValueByFairValueHierarchyLevelAxis-FairValueInputsLevel1Member_FairValueByMeasurementFrequencyAxis-FairValueMeasurementsRecurringMember" unitRef="USD" name="us-gaap:CashAndCashEquivalentsFairValueDisclosure" scale="0" format="ixt:numdotdecimal" decimals="INF">5,046,607</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);">$</td><td style="width: 16%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"><ix:nonFraction id="c84240764" contextRef="i_2022-03-31_FairValueByFairValueHierarchyLevelAxis-FairValueInputsLevel2Member_FairValueByMeasurementFrequencyAxis-FairValueMeasurementsRecurringMember" unitRef="USD" name="us-gaap:CashAndCashEquivalentsFairValueDisclosure" scale="0" format="ixt:numdotdecimal" decimals="INF">3,499,545</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);">$</td><td style="width: 16%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"><ix:nonFraction id="c84240765" contextRef="i_2022-03-31_FairValueByFairValueHierarchyLevelAxis-FairValueInputsLevel3Member_FairValueByMeasurementFrequencyAxis-FairValueMeasurementsRecurringMember" unitRef="USD" name="us-gaap:CashAndCashEquivalentsFairValueDisclosure" scale="0" format="ixt:zerodash" decimals="INF">&#x2014;</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"><td>&#xa0;</td><td>&#xa0;</td><td>&#xa0;</td><td>&#xa0;</td><td>&#xa0;</td><td>&#xa0;</td><td>&#xa0;</td><td>&#xa0;</td><td>&#xa0;</td><td>&#xa0;</td><td>&#xa0;</td><td>&#xa0;</td><td>&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Marketable securities:</p> </td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt; margin-left: 9pt;">Commercial paper</p> </td><td style="width: 1%; font-family: &quot;Times New Roman&quot;; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;; font-size: 10pt;">&#xa0;</td><td style="width: 16%; font-family: &quot;Times New Roman&quot;; font-size: 10pt; margin-left: 0pt; text-align: right;"><ix:nonFraction id="c84240767" contextRef="i_2022-03-31_FairValueByFairValueHierarchyLevelAxis-FairValueInputsLevel1Member_FairValueByMeasurementFrequencyAxis-FairValueMeasurementsRecurringMember_FinancialInstrumentAxis-CommercialPaperNotIncludedWithCashAndCashEquivalentsMember" unitRef="USD" name="us-gaap:AvailableForSaleSecuritiesDebtSecurities" scale="0" format="ixt:zerodash" decimals="INF">&#x2014;</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;; font-size: 10pt; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 16%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"><ix:nonFraction id="c84240768" contextRef="i_2022-03-31_FairValueByFairValueHierarchyLevelAxis-FairValueInputsLevel2Member_FairValueByMeasurementFrequencyAxis-FairValueMeasurementsRecurringMember_FinancialInstrumentAxis-CommercialPaperNotIncludedWithCashAndCashEquivalentsMember" unitRef="USD" name="us-gaap:AvailableForSaleSecuritiesDebtSecurities" scale="0" format="ixt:numdotdecimal" decimals="INF">19,676,153</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;; font-size: 10pt;">&#xa0;</td><td style="width: 16%; font-family: &quot;Times New Roman&quot;; font-size: 10pt; margin-left: 0pt; text-align: right;"><ix:nonFraction id="c84240769" contextRef="i_2022-03-31_FairValueByFairValueHierarchyLevelAxis-FairValueInputsLevel3Member_FairValueByMeasurementFrequencyAxis-FairValueMeasurementsRecurringMember_FinancialInstrumentAxis-CommercialPaperNotIncludedWithCashAndCashEquivalentsMember" unitRef="USD" name="us-gaap:AvailableForSaleSecuritiesDebtSecurities" scale="0" format="ixt:zerodash" decimals="INF">&#x2014;</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;; font-size: 10pt; margin-left: 0pt;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt; margin-left: 9pt;">US treasury</p> </td><td style="width: 1%; font-family: &quot;Times New Roman&quot;; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);">&#xa0;</td><td style="width: 16%; font-family: &quot;Times New Roman&quot;; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0); text-align: right;"><ix:nonFraction id="c84240770" contextRef="i_2022-03-31_FairValueByFairValueHierarchyLevelAxis-FairValueInputsLevel1Member_FairValueByMeasurementFrequencyAxis-FairValueMeasurementsRecurringMember_FinancialInstrumentAxis-USTreasurySecuritiesMember" unitRef="USD" name="us-gaap:AvailableForSaleSecuritiesDebtSecurities" scale="0" format="ixt:zerodash" decimals="INF">&#x2014;</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);">&#xa0;</td><td style="width: 16%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"><ix:nonFraction id="c84240771" contextRef="i_2022-03-31_FairValueByFairValueHierarchyLevelAxis-FairValueInputsLevel2Member_FairValueByMeasurementFrequencyAxis-FairValueMeasurementsRecurringMember_FinancialInstrumentAxis-USTreasurySecuritiesMember" unitRef="USD" name="us-gaap:AvailableForSaleSecuritiesDebtSecurities" scale="0" format="ixt:numdotdecimal" decimals="INF">3,004,150</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);">&#xa0;</td><td style="width: 16%; font-family: &quot;Times New Roman&quot;; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0); text-align: right;"><ix:nonFraction id="c84240772" contextRef="i_2022-03-31_FairValueByFairValueHierarchyLevelAxis-FairValueInputsLevel3Member_FairValueByMeasurementFrequencyAxis-FairValueMeasurementsRecurringMember_FinancialInstrumentAxis-USTreasurySecuritiesMember" unitRef="USD" name="us-gaap:AvailableForSaleSecuritiesDebtSecurities" scale="0" format="ixt:zerodash" decimals="INF">&#x2014;</ix:nonFraction></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Total marketable securities</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);">$</td><td style="width: 16%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"><ix:nonFraction id="c84240773" contextRef="i_2022-03-31_FairValueByFairValueHierarchyLevelAxis-FairValueInputsLevel1Member_FairValueByMeasurementFrequencyAxis-FairValueMeasurementsRecurringMember" unitRef="USD" name="us-gaap:AvailableForSaleSecuritiesDebtSecurities" scale="0" format="ixt:zerodash" decimals="INF">&#x2014;</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);">$</td><td style="width: 16%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"><ix:nonFraction id="c84240774" contextRef="i_2022-03-31_FairValueByFairValueHierarchyLevelAxis-FairValueInputsLevel2Member_FairValueByMeasurementFrequencyAxis-FairValueMeasurementsRecurringMember" unitRef="USD" name="us-gaap:AvailableForSaleSecuritiesDebtSecurities" scale="0" format="ixt:numdotdecimal" decimals="INF">22,680,303</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);">$</td><td style="width: 16%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"><ix:nonFraction id="c84240775" contextRef="i_2022-03-31_FairValueByFairValueHierarchyLevelAxis-FairValueInputsLevel3Member_FairValueByMeasurementFrequencyAxis-FairValueMeasurementsRecurringMember" unitRef="USD" name="us-gaap:AvailableForSaleSecuritiesDebtSecurities" scale="0" format="ixt:zerodash" decimals="INF">&#x2014;</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"><td>&#xa0;</td><td style="padding-bottom: 1px;">&#xa0;</td><td style="border-bottom: 1px solid rgb(0, 0, 0);">&#xa0;</td><td style="border-bottom: 1px solid rgb(0, 0, 0);">&#xa0;</td><td style="padding-bottom: 1px;">&#xa0;</td><td style="padding-bottom: 1px;">&#xa0;</td><td style="border-bottom: 1px solid rgb(0, 0, 0);">&#xa0;</td><td style="border-bottom: 1px solid rgb(0, 0, 0);">&#xa0;</td><td style="padding-bottom: 1px;">&#xa0;</td><td style="padding-bottom: 1px;">&#xa0;</td><td style="border-bottom: 1px solid rgb(0, 0, 0);">&#xa0;</td><td style="border-bottom: 1px solid rgb(0, 0, 0);">&#xa0;</td><td style="padding-bottom: 1px;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Total financial assets</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);">$</td><td style="width: 16%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"><ix:nonFraction id="c84240776" contextRef="i_2022-03-31_FairValueByFairValueHierarchyLevelAxis-FairValueInputsLevel1Member_FairValueByMeasurementFrequencyAxis-FairValueMeasurementsRecurringMember" unitRef="USD" name="us-gaap:AssetsFairValueDisclosure" scale="0" format="ixt:numdotdecimal" decimals="INF">5,046,607</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);">$</td><td style="width: 16%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"><ix:nonFraction id="c84240777" contextRef="i_2022-03-31_FairValueByFairValueHierarchyLevelAxis-FairValueInputsLevel2Member_FairValueByMeasurementFrequencyAxis-FairValueMeasurementsRecurringMember" unitRef="USD" name="us-gaap:AssetsFairValueDisclosure" scale="0" format="ixt:numdotdecimal" decimals="INF">26,179,848</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);">$</td><td style="width: 16%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"><ix:nonFraction id="c84240778" contextRef="i_2022-03-31_FairValueByFairValueHierarchyLevelAxis-FairValueInputsLevel3Member_FairValueByMeasurementFrequencyAxis-FairValueMeasurementsRecurringMember" unitRef="USD" name="us-gaap:AssetsFairValueDisclosure" scale="0" format="ixt:zerodash" decimals="INF">&#x2014;</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; margin-left: 0pt;">&#xa0;</td></tr>
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   <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">The fair value of the Company&#x2019;s Level <em style="font: inherit;">2</em> marketable securities are&#xa0;estimated primarily based on benchmark yields, reported trades, market-based quotes, issuer spreads, <em style="font: inherit;">two</em>-sided markets, benchmark securities, bids, offers, and reference data including market research publications, which represent a market approach. In general, a market approach is utilized if there is readily available and relevant market activity for an individual security. This valuation technique <em style="font: inherit;"> may </em>change from period to period, based on the relevance and availability of market data.</p>
   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">&#xa0;</p>
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  <div>
    &#xa0;
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   <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">Accrued expenses and other current liabilities consisted of the following as of the dates indicated below:</p>
   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin: 0pt; text-indent: 45pt; text-align: justify;">&#xa0;</p>
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    <table border="0" cellpadding="0" cellspacing="0" class="finTable" style="width: 100%; font-size: 10pt; font-family: Times New Roman; text-indent: 0px;"><tbody><tr style="vertical-align: bottom;"><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td colspan="2" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b><b>March 31,</b></b></p> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b><b>2022</b></b></p> </td><td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td colspan="2" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b><b>December 31,</b></b></p> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b><b>2021</b></b></p> </td><td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"><td style="font-family: Times New Roman; font-size: 10pt; width: 70%;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Accrued payroll and payroll related expenses</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">$</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"><ix:nonFraction id="c84240780" contextRef="i_2022-03-31" unitRef="USD" name="us-gaap:AccruedSalariesCurrent" scale="0" format="ixt:numdotdecimal" decimals="INF">399,847</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">$</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"><ix:nonFraction id="c84240781" contextRef="i_2021-12-31" unitRef="USD" name="us-gaap:AccruedSalariesCurrent" scale="0" format="ixt:numdotdecimal" decimals="INF">879,971</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Accrued professional fees</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"><ix:nonFraction id="c84240782" contextRef="i_2022-03-31" unitRef="USD" name="us-gaap:AccruedProfessionalFeesCurrent" scale="0" format="ixt:numdotdecimal" decimals="INF">142,668</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"><ix:nonFraction id="c84240783" contextRef="i_2021-12-31" unitRef="USD" name="us-gaap:AccruedProfessionalFeesCurrent" scale="0" format="ixt:numdotdecimal" decimals="INF">247,704</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Accrued clinical studies expenses</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"><ix:nonFraction id="c84240784" contextRef="i_2022-03-31" unitRef="USD" name="dffn:AccruedClinicalStudiesExpensesCurrent" scale="0" format="ixt:numdotdecimal" decimals="INF">1,472,119</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"><ix:nonFraction id="c84240785" contextRef="i_2021-12-31" unitRef="USD" name="dffn:AccruedClinicalStudiesExpensesCurrent" scale="0" format="ixt:numdotdecimal" decimals="INF">786,579</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Other</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);">&#xa0;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"><ix:nonFraction id="c84240786" contextRef="i_2022-03-31" unitRef="USD" name="us-gaap:OtherSundryLiabilitiesCurrent" scale="0" format="ixt:numdotdecimal" decimals="INF">127,999</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);">&#xa0;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"><ix:nonFraction id="c84240787" contextRef="i_2021-12-31" unitRef="USD" name="us-gaap:OtherSundryLiabilitiesCurrent" scale="0" format="ixt:numdotdecimal" decimals="INF">65,935</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Total</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);">$</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"><ix:nonFraction id="c84240788" contextRef="i_2022-03-31" unitRef="USD" name="us-gaap:OtherAccruedLiabilitiesCurrent" scale="0" format="ixt:numdotdecimal" decimals="INF">2,142,633</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);">$</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"><ix:nonFraction id="c84240789" contextRef="i_2021-12-31" unitRef="USD" name="us-gaap:OtherAccruedLiabilitiesCurrent" scale="0" format="ixt:numdotdecimal" decimals="INF">1,980,189</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; margin-left: 0pt;">&#xa0;</td></tr>
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   <table border="0" cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;width:100%;margin-left:auto;margin-right:auto;"><tbody><tr><td style="vertical-align:top;width:9%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;"><b><em style="font: inherit;">7.</em></b></p> </td><td style="vertical-align: top; width: 91%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;"><b>Stockholders' Equity and Common Stock Warrants</b></p> </td></tr>
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   <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt;"><i>Private Placement of Series C Preferred Stock</i></p>
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   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">On <em style="font: inherit;"> March 18, 2022, </em>the Company issued and sold to Robert J. Cobuzzi, Jr., Ph.D., its President &amp; Chief Executive Officer, and William R. Elder, its General Counsel &amp; Corporate Secretary, an aggregate of <ix:nonFraction id="c84240791" contextRef="d_2022-03-18_2022-03-18_StatementClassOfStockAxis-SeriesCPreferredStockMember_TitleOfIndividualAxis-PresidentMember" unitRef="Share" name="us-gaap:StockIssuedDuringPeriodSharesNewIssues" scale="0" format="ixt:numdotdecimal" decimals="INF">10,000</ix:nonFraction> shares of Series C Preferred Stock at an offering price of $<ix:nonFraction id="c84240792" contextRef="i_2022-03-18_StatementClassOfStockAxis-SeriesCPreferredStockMember_TitleOfIndividualAxis-PresidentMember" unitRef="USDPerShare" name="us-gaap:SaleOfStockPricePerShare" scale="0" format="ixt:numdotdecimal" decimals="INF">0.50</ix:nonFraction> per share, representing <em style="font: inherit;">100%</em> of the stated value per share of the Series C Preferred Stock, for aggregate gross proceeds of <span style="-sec-ix-hidden:c84240794">$5,000.</span></p>
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   <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt 0pt 0pt 8pt;"><b>DIFFUSION PHARMACEUTICALS INC.</b>&#xa0;</p>
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   <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt 0pt 0pt 8pt;"><b>NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS</b></p>
   <p style="font-family: 'Times New Roman', Times, serif; font-size: 10pt; margin: 0pt; text-align: left">&#xa0;</p></ix:exclude><p style="font-family: 'Times New Roman', Times, serif; font-size: 10pt; margin: 0pt; text-align: left"></p>
   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">The Series C Certificate provides that, among other things, (i) each share of Series C Preferred Stock is convertible into <ix:nonFraction id="c84240796" contextRef="i_2022-03-18_StatementClassOfStockAxis-SeriesCPreferredStockMember" unitRef="Pure" name="us-gaap:PreferredStockConvertibleConversionRatio" scale="0" format="ixt:numdotdecimal" decimals="INF">0.02</ix:nonFraction> shares of the Company's common stock, representing a conversion price of $<ix:nonFraction id="c84240797" contextRef="i_2022-03-18_StatementClassOfStockAxis-SeriesCPreferredStockMember" unitRef="USDPerShare" name="us-gaap:PreferredStockConvertibleConversionPrice" scale="0" format="ixt:numdotdecimal" decimals="INF">25.00</ix:nonFraction> per share, subject to certain conditions, (ii) each share of Series C Preferred Stock outstanding is counted on an as converted basis, together with the Company&#x2019;s common stock as a single class, for purposes of determining the presence of a quorum at any meeting at which holders are asked to vote on matters related to the Reverse Stock Split (subject to any applicable exchange listing rules), (iii) each share of Series C Preferred Stock outstanding has the right to cast <em style="font: inherit;">1,600</em> votes per share of Series C Preferred Stock on the Reverse Stock Split on a &#x201c;mirrored&#x201d; basis &#x2014; this means that the holders of the Series C Preferred Stock are required to vote their shares in a manner that &#x201c;mirrors&#x201d; the proportions of &#x201c;For&#x201d; and &#x201c;Against&#x201d; votes cast by the holders of the Company&#x2019;s common stock are voted on the Amendment (excluding, for the avoidance of doubt, any shares of common stock that are <em style="font: inherit;">not</em> voted), and (iv) the holders of outstanding shares of Series C Preferred Stock are entitled to dividends, on an as converted basis, equal to dividends actually paid, if any, on shares of common stock and participate in any liquidation of the Company on an as converted basis.</p>
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   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">On <em style="font: inherit;"> April 18, 2022, </em>following approval of the Reverse Stock Split by the Company's stockholders, all <ix:nonFraction id="c84240801" contextRef="d_2022-04-18_2022-04-18_ConversionOfStockByUniqueDescriptionAxis-ConversionOfSeriesCPreferredStockIntoCommonStockMember_SubsequentEventTypeAxis-SubsequentEventMember" unitRef="Share" name="us-gaap:ConversionOfStockSharesConverted1" scale="0" format="ixt:numdotdecimal" decimals="INF">10,000</ix:nonFraction> shares of Series C Preferred Stock were converted into an aggregate of <ix:nonFraction id="c84240802" contextRef="d_2022-04-18_2022-04-18_ConversionOfStockByUniqueDescriptionAxis-ConversionOfSeriesCPreferredStockIntoCommonStockMember_SubsequentEventTypeAxis-SubsequentEventMember" unitRef="Share" name="us-gaap:ConversionOfStockSharesIssued1" scale="0" format="ixt:numdotdecimal" decimals="INF">200</ix:nonFraction> shares of the Company's common stock in accordance with the terms of the Series C Certificate.</p>
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   <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt;"><i>Common Stock Warrants</i></p>
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   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">During its evaluation of equity classification for the Company's common stock warrants issued in previous periods, the Company considered the conditions as prescribed within ASC <em style="font: inherit;">815</em>-<em style="font: inherit;">40,</em><i> Derivatives and Hedging</i>, <i>Contracts in an Entity</i>&#x2019;<i>s own Equity</i>. The conditions within ASC <em style="font: inherit;">815</em>-<em style="font: inherit;">40</em> are <em style="font: inherit;">not</em> subject to a probability assessment. The warrants do <em style="font: inherit;">not</em> fall under the liability criteria within ASC <em style="font: inherit;">480</em> <i>Distinguishing Liabilities from Equity</i> as they are <em style="font: inherit;">not</em> puttable and do <em style="font: inherit;">not</em> represent an instrument that has a redeemable underlying security. The warrants do meet the definition of a derivative instrument under ASC <em style="font: inherit;">815,</em> but are eligible for the scope exception as they are indexed to the Company&#x2019;s own stock and would be classified in permanent equity if freestanding.</p>
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   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">As of <em style="font: inherit;"> March&#xa0;</em><em style="font: inherit;">31,</em> <em style="font: inherit;">2022,</em> the Company had the following warrants outstanding to acquire shares of its common stock:</p>
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   <ix:nonNumeric contextRef="d_2022-01-01_2022-03-31" name="us-gaap:ScheduleOfStockholdersEquityNoteWarrantsOrRightsTextBlock" id="c2124505" escape="true">
    <table border="0" cellpadding="0" cellspacing="0" class="finTable" style="width: 100%; font-size: 10pt; font-family: Times New Roman; text-indent: 0px;"><tbody><tr style="vertical-align: bottom;"><td style="font-family: Times New Roman; font-size: 10pt; width: 52%;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt; width: 1%;">&#xa0;</td><td colspan="2" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0); width: 1%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b><b>Outstanding</b></b></p> </td><td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; width: 1%;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt; width: 1%;">&#xa0;</td><td colspan="3" rowspan="1" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0); width: 9%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b><b>Range of exercise</b></b></p> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b><b>price per share</b></b></p> </td><td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; width: 1%;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; width: 1%;">&#xa0;</td><td style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; width: 18%; border-bottom: 1px solid rgb(0, 0, 0);"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b>Expiration dates</b></p> </td></tr>
<tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"><td style="font-family: Times New Roman; font-size: 10pt; width: 52%;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Common stock warrants issued related to the January 2018 common stock offering</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 10%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"><ix:nonFraction id="c84240820" contextRef="i_2022-03-31_ClassOfWarrantOrRightAxis-WarrantsIssuedInConnectionWithTheJanuary2018OfferingMember" unitRef="Share" name="us-gaap:ClassOfWarrantOrRightOutstanding" scale="0" format="ixt:numdotdecimal" decimals="INF">23,639</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt; width: 1%;">&#xa0;</td><td colspan="1" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; width: 5%;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin: 0pt; text-align: right;">$<ix:nonFraction id="c84240821" contextRef="i_2022-03-31_ClassOfWarrantOrRightAxis-WarrantsIssuedInConnectionWithTheJanuary2018OfferingMember_RangeAxis-MinimumMember" unitRef="USDPerShare" name="us-gaap:ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1" scale="0" format="ixt:numdotdecimal" decimals="INF">599.71</ix:nonFraction></p> </td><td style="font-family: Times New Roman; font-size: 10pt; width: 4%; text-align: center;"><em style="font: inherit;">-</em></td><td style="font-family: Times New Roman; font-size: 10pt; width: 5%;">$<ix:nonFraction id="c84240823" contextRef="i_2022-03-31_ClassOfWarrantOrRightAxis-WarrantsIssuedInConnectionWithTheJanuary2018OfferingMember_RangeAxis-MaximumMember" unitRef="USDPerShare" name="us-gaap:ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1" scale="0" format="ixt:numdotdecimal" decimals="INF">749.76</ix:nonFraction></td><td style="font-family: Times New Roman; font-size: 10pt; width: 1%;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt; width: 1%;">&#xa0;</td><td style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; width: 18%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><em style="font: inherit;">January 2023</em></p> </td></tr>
<tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"><td style="font-family: Times New Roman; font-size: 10pt; width: 52%;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Common stock warrants issued related to the May 2019 common stock offering</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 10%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"><ix:nonFraction id="c84240825" contextRef="i_2022-03-31_ClassOfWarrantOrRightAxis-WarrantsIssuedInConnectionWithMay2019PublicOfferingMember" unitRef="Share" name="us-gaap:ClassOfWarrantOrRightOutstanding" scale="0" format="ixt:numdotdecimal" decimals="INF">27,648</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt; width: 1%;">&#xa0;</td><td colspan="1" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; width: 5%;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin: 0pt; text-align: right;">$<ix:nonFraction id="c84240826" contextRef="i_2022-03-31_ClassOfWarrantOrRightAxis-WarrantsIssuedInConnectionWithMay2019PublicOfferingMember_RangeAxis-MinimumMember" unitRef="USDPerShare" name="us-gaap:ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1" scale="0" format="ixt:numdotdecimal" decimals="INF">250.09</ix:nonFraction></p> </td><td style="font-family: Times New Roman; font-size: 10pt; width: 4%; text-align: center;"><em style="font: inherit;">-</em></td><td style="font-family: Times New Roman; font-size: 10pt; width: 5%;">$<ix:nonFraction id="c84240828" contextRef="i_2022-03-31_ClassOfWarrantOrRightAxis-WarrantsIssuedInConnectionWithMay2019PublicOfferingMember_RangeAxis-MaximumMember" unitRef="USDPerShare" name="us-gaap:ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1" scale="0" format="ixt:numdotdecimal" decimals="INF">306.04</ix:nonFraction></td><td style="font-family: Times New Roman; font-size: 10pt; width: 1%;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt; width: 1%;">&#xa0;</td><td style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; width: 18%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><em style="font: inherit;">May and December 2024</em></p> </td></tr>
<tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"><td style="font-family: Times New Roman; font-size: 10pt; width: 52%;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Common stock warrants issued related to the November 2019 common stock offering</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 10%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"><ix:nonFraction id="c84240830" contextRef="i_2022-03-31_ClassOfWarrantOrRightAxis-WarrantsIssuedInConnectionWithTheNovember2019OfferingMember" unitRef="Share" name="us-gaap:ClassOfWarrantOrRightOutstanding" scale="0" format="ixt:numdotdecimal" decimals="INF">4,269</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 5%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"><em style="font: inherit;">&#xa0;</em></td><td style="width: 4%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; text-align: center;">$<ix:nonFraction id="c84240832" contextRef="i_2022-03-31_ClassOfWarrantOrRightAxis-WarrantsIssuedInConnectionWithTheNovember2019OfferingMember" unitRef="USDPerShare" name="us-gaap:ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1" scale="0" format="ixt:numdotdecimal" decimals="INF">17.51</ix:nonFraction></td><td style="width: 5%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"><em style="font: inherit;">&#xa0;</em></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#xa0;</td><td style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; width: 18%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><em style="font: inherit;">May 2024</em></p> </td></tr>
<tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"><td style="font-family: Times New Roman; font-size: 10pt; width: 52%;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Common stock warrants issued related to the December 2019 common stock offering</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 10%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"><ix:nonFraction id="c84240835" contextRef="i_2022-03-31_ClassOfWarrantOrRightAxis-WarrantsIssuedInConnectionWithTheDecember2019OfferingMember" unitRef="Share" name="us-gaap:ClassOfWarrantOrRightOutstanding" scale="0" format="ixt:numdotdecimal" decimals="INF">6,264</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt; width: 1%;">&#xa0;</td><td colspan="1" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; width: 5%;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin: 0pt; text-align: right;">$<ix:nonFraction id="c84240836" contextRef="i_2022-03-31_ClassOfWarrantOrRightAxis-WarrantsIssuedInConnectionWithTheDecember2019OfferingMember_RangeAxis-MinimumMember" unitRef="USDPerShare" name="us-gaap:ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1" scale="0" format="ixt:numdotdecimal" decimals="INF">21.68</ix:nonFraction></p> </td><td style="font-family: Times New Roman; font-size: 10pt; width: 4%; text-align: center;"><em style="font: inherit;">-</em></td><td style="font-family: Times New Roman; font-size: 10pt; width: 5%;">$<ix:nonFraction id="c84240838" contextRef="i_2022-03-31_ClassOfWarrantOrRightAxis-WarrantsIssuedInConnectionWithTheDecember2019OfferingMember_RangeAxis-MaximumMember" unitRef="USDPerShare" name="us-gaap:ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1" scale="0" format="ixt:numdotdecimal" decimals="INF">34.92</ix:nonFraction></td><td style="font-family: Times New Roman; font-size: 10pt; width: 1%;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt; width: 1%;">&#xa0;</td><td style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; width: 18%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><em style="font: inherit;">December 2024 and June 2025</em></p> </td></tr>
<tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"><td style="font-family: Times New Roman; font-size: 10pt; width: 52%;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Common stock warrants issued related to the May 2020 common stock offering</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 10%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"><ix:nonFraction id="c84240840" contextRef="i_2022-03-31_ClassOfWarrantOrRightAxis-CommonStockWarrantsIssuedRelatedToMay2020CommonStockOfferingMember" unitRef="Share" name="us-gaap:ClassOfWarrantOrRightOutstanding" scale="0" format="ixt:numdotdecimal" decimals="INF">11,424</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 5%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"><em style="font: inherit;">&#xa0;</em></td><td style="width: 4%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; text-align: center;">$<ix:nonFraction id="c84240842" contextRef="i_2022-03-31_ClassOfWarrantOrRightAxis-CommonStockWarrantsIssuedRelatedToMay2020CommonStockOfferingMember" unitRef="USDPerShare" name="us-gaap:ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1" scale="0" format="ixt:numdotdecimal" decimals="INF">65.65</ix:nonFraction></td><td style="width: 5%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"><em style="font: inherit;">&#xa0;</em></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#xa0;</td><td style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; width: 18%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><em style="font: inherit;">March 2025</em></p> </td></tr>
<tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"><td style="font-family: Times New Roman; font-size: 10pt; width: 52%;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Common stock warrants issued related to the May 2020 investor warrant exercise</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 10%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"><ix:nonFraction id="c84240845" contextRef="i_2022-03-31_ClassOfWarrantOrRightAxis-TheMay2020InvestorWarrantExerciseMember" unitRef="Share" name="us-gaap:ClassOfWarrantOrRightOutstanding" scale="0" format="ixt:numdotdecimal" decimals="INF">4,998</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 5%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"><em style="font: inherit;">&#xa0;</em></td><td style="width: 4%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; text-align: center;">$<ix:nonFraction id="c84240847" contextRef="i_2022-03-31_ClassOfWarrantOrRightAxis-TheMay2020InvestorWarrantExerciseMember" unitRef="USDPerShare" name="us-gaap:ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1" scale="0" format="ixt:numdotdecimal" decimals="INF">29.7</ix:nonFraction></td><td style="width: 5%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"><em style="font: inherit;">&#xa0;</em></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#xa0;</td><td style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; width: 18%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><em style="font: inherit;">November 2025</em></p> </td></tr>
<tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"><td style="font-family: Times New Roman; font-size: 10pt; width: 52%;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Common stock warrants issued related to the February 2021 common stock offering</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);">&#xa0;</td><td style="width: 10%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"><ix:nonFraction id="c84240850" contextRef="i_2022-03-31_ClassOfWarrantOrRightAxis-CommonStockWarrantsIssuedRelatedToFebruary2021CommonStockOfferingMember" unitRef="Share" name="us-gaap:ClassOfWarrantOrRightOutstanding" scale="0" format="ixt:numdotdecimal" decimals="INF">33,649</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 5%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"><em style="font: inherit;">&#xa0;</em></td><td style="width: 4%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt; text-align: center;">$<ix:nonFraction id="c84240852" contextRef="i_2022-03-31_ClassOfWarrantOrRightAxis-CommonStockWarrantsIssuedRelatedToFebruary2021CommonStockOfferingMember" unitRef="USDPerShare" name="us-gaap:ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1" scale="0" format="ixt:numdotdecimal" decimals="INF">64.08</ix:nonFraction></td><td style="width: 5%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;"><em style="font: inherit;">&#xa0;</em></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;">&#xa0;</td><td style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; width: 18%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><em style="font: inherit;">February 2026</em></p> </td></tr>
<tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"><td style="font-family: Times New Roman; font-size: 10pt; width: 52%;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 3px double rgb(0, 0, 0);">&#xa0;</td><td style="width: 10%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"><ix:nonFraction id="c84240855" contextRef="i_2022-03-31" unitRef="Share" name="us-gaap:ClassOfWarrantOrRightOutstanding" scale="0" format="ixt:numdotdecimal" decimals="INF">111,891</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; margin-left: 0pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt; width: 1%;">&#xa0;</td><td style="text-align: right; font-family: Times New Roman; font-size: 10pt; width: 5%;"><em style="font: inherit;">&#xa0;</em></td><td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; width: 4%;"><em style="font: inherit;">&#xa0;</em></td><td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; width: 5%;"><em style="font: inherit;">&#xa0;</em></td><td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; width: 1%;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; width: 1%;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt; width: 18%;"><em style="font: inherit;">&#xa0;</em></td></tr>
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   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin: 0pt; text-indent: 45pt; text-align: justify;">During the <em style="font: inherit;">three</em> months ended <em style="font: inherit;"> March&#xa0;</em><em style="font: inherit;">31,</em> <em style="font: inherit;">2022,</em> <ix:nonFraction id="c84240818" contextRef="d_2022-01-01_2022-03-31" unitRef="Share" name="dffn:ClassOfWarrantOrRightsExpired" scale="0" format="ixt:numdotdecimal" decimals="INF">18,077</ix:nonFraction> warrants expired.</p>
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   <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt 0pt 0pt 8pt;"><b>DIFFUSION PHARMACEUTICALS INC.</b>&#xa0;</p>
   <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
   <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt 0pt 0pt 8pt;"><b>NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS</b></p></ix:exclude><p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt 0pt 0pt 8pt;"><b></b></p>
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  <ix:nonNumeric contextRef="d_2022-01-01_2022-03-31" name="us-gaap:DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock" id="c2124506" escape="true">
   <table border="0" cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;width:100%;margin-left:auto;margin-right:auto;"><tbody><tr><td style="vertical-align:top;width:9%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;"><b><em style="font: inherit;">8.</em></b></p> </td><td style="vertical-align: top; width: 91%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;"><b>Stock-Based Compensation</b></p> </td></tr>
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   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin: 0pt; text-indent: 9pt;"><i><em style="font: inherit;">2015</em> Equity Plan</i></p>
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   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">The <em style="font: inherit;">2015</em> Equity Plan provides for increases to the number of shares reserved for issuance thereunder each <em style="font: inherit;"> January 1 </em>equal to <ix:nonFraction id="c84240863" contextRef="d_2022-01-01_2022-03-31_PlanNameAxis-EquityIncentivePlan2015Member" unitRef="Pure" name="dffn:PercentageOfTotalSharesEligibleForPlanReserveOnAnAnnualBasis" scale="-2" format="ixt:numdotdecimal" decimals="2">4.0</ix:nonFraction>% of the total shares of the Company&#x2019;s common stock outstanding as of the immediately preceding <em style="font: inherit;"> December 31, </em>unless a lesser amount is stipulated by the Compensation Committee of the Company's board of directors. Accordingly, <ix:nonFraction id="c84240864" contextRef="d_2022-01-01_2022-01-01_PlanNameAxis-EquityIncentivePlan2015Member" unitRef="Share" name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized" scale="0" format="ixt:numdotdecimal" decimals="INF">81,531</ix:nonFraction> shares were added to the reserve as of <em style="font: inherit;"> January 1, 2022, </em>which shares <em style="font: inherit;"> may </em>be issued in connection with the grant of stock-based awards, including stock options, restricted stock, restricted stock units, stock appreciation rights and other types of awards as deemed appropriate, in each case, in accordance with the terms of the <em style="font: inherit;">2015</em> Equity Plan. As of <em style="font: inherit;"> March 31, 2022, </em>there were <ix:nonFraction id="c84240866" contextRef="i_2022-03-31_PlanNameAxis-EquityIncentivePlan2015Member" unitRef="Share" name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant" scale="0" format="ixt:numdotdecimal" decimals="INF">49,039</ix:nonFraction> shares available for future issuance under the <em style="font: inherit;">2015</em> Equity Plan.</p>
   <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
   <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt;text-indent:45pt;">The Company recorded stock-based compensation expense in the following expense categories of its unaudited interim consolidated statements of operations for the periods indicated:</p>
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   <ix:nonNumeric contextRef="d_2022-01-01_2022-03-31" name="us-gaap:ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock" id="c2124507" escape="true">
    <table border="0" cellpadding="0" cellspacing="0" class="finTable" style="width: 100%; font-size: 10pt; font-family: Times New Roman; text-indent: 0px;"><tbody><tr style="vertical-align: bottom;"><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td colspan="6" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b><b>Three Months Ended</b></b></p> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b><b>March 31,</b></b></p> </td><td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px;">&#xa0;</td></tr>
<tr style="vertical-align: bottom;"><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td colspan="2" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b><b>2022</b></b></p> </td><td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td colspan="2" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b><b>2021</b></b></p> </td><td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"><td style="font-family: Times New Roman; font-size: 10pt; width: 70%;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Research and development</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">$</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"><ix:nonFraction id="c84240905" contextRef="d_2022-01-01_2022-03-31_IncomeStatementLocationAxis-ResearchAndDevelopmentExpenseMember" unitRef="USD" name="us-gaap:AllocatedShareBasedCompensationExpense" scale="0" format="ixt:numdotdecimal" decimals="INF">58,892</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">$</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"><ix:nonFraction id="c84240906" contextRef="d_2021-01-01_2021-03-31_IncomeStatementLocationAxis-ResearchAndDevelopmentExpenseMember" unitRef="USD" name="us-gaap:AllocatedShareBasedCompensationExpense" scale="0" format="ixt:numdotdecimal" decimals="INF">33,000</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">General and administrative</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);">&#xa0;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"><ix:nonFraction id="c84240907" contextRef="d_2022-01-01_2022-03-31_IncomeStatementLocationAxis-GeneralAndAdministrativeExpenseMember" unitRef="USD" name="us-gaap:AllocatedShareBasedCompensationExpense" scale="0" format="ixt:numdotdecimal" decimals="INF">219,239</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);">&#xa0;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"><ix:nonFraction id="c84240908" contextRef="d_2021-01-01_2021-03-31_IncomeStatementLocationAxis-GeneralAndAdministrativeExpenseMember" unitRef="USD" name="us-gaap:AllocatedShareBasedCompensationExpense" scale="0" format="ixt:numdotdecimal" decimals="INF">148,280</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Total stock-based compensation expense</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);">$</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"><ix:nonFraction id="c84240909" contextRef="d_2022-01-01_2022-03-31" unitRef="USD" name="us-gaap:AllocatedShareBasedCompensationExpense" scale="0" format="ixt:numdotdecimal" decimals="INF">278,131</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);">$</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"><ix:nonFraction id="c84240910" contextRef="d_2021-01-01_2021-03-31" unitRef="USD" name="us-gaap:AllocatedShareBasedCompensationExpense" scale="0" format="ixt:numdotdecimal" decimals="INF">181,280</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; margin-left: 0pt;">&#xa0;</td></tr>
</tbody></table>
   </ix:nonNumeric>
   <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">The following table summarizes the activity related to all stock option grants for the <em style="font: inherit;">three</em> months ended <em style="font: inherit;"> March&#xa0;</em><em style="font: inherit;">31,</em> <em style="font: inherit;">2022:</em></p>
   <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
   <ix:nonNumeric contextRef="d_2022-01-01_2022-03-31" name="us-gaap:ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock" id="c2124508" escape="true">
    <table border="0" cellpadding="0" cellspacing="0" class="finTable" style="width: 100%; font-size: 10pt; font-family: Times New Roman; text-indent: 0px;"><tbody><tr style="vertical-align: bottom;"><td style="font-family: Times New Roman; font-size: 10pt; width: 40%;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt; width: 1%;">&#xa0;</td><td colspan="2" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0); width: 1%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b><b>Number of</b></b></p> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b><b>Options</b></b></p> </td><td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; width: 1%;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt; width: 1%;">&#xa0;</td><td colspan="2" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0); width: 1%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b><b>Weighted</b></b></p> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b><b>average</b></b></p> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b><b>exercise</b></b></p> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b><b>price</b></b></p> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b><b>per share</b></b></p> </td><td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; width: 1%;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt; width: 1%;">&#xa0;</td><td colspan="2" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0); width: 1%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b><b>Weighted</b></b></p> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b><b>average</b></b></p> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b><b>remaining</b></b></p> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b><b>contractual</b></b></p> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b><b>life</b></b></p> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b><b>(in years)</b></b></p> </td><td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; width: 1%;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt; width: 1%;">&#xa0;</td><td colspan="2" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0); width: 1%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b><b>Aggregate</b></b></p> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b><b>intrinsic</b></b></p> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b><b>value</b></b></p> </td><td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; width: 1%;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"><td style="font-family: Times New Roman; font-size: 10pt; width: 40%;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Balance at January 1, 2022</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"><ix:nonFraction id="c84240911" contextRef="i_2020-12-31" unitRef="Share" name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber" scale="0" format="ixt:numdotdecimal" decimals="INF">72,454</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">$</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"><ix:nonFraction id="c84240912" contextRef="i_2020-12-31" unitRef="USDPerShare" name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice" scale="0" format="ixt:numdotdecimal" decimals="INF">265.85</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt; width: 1%;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt; width: 1%;">&#xa0;</td><td style="text-align: right; font-family: Times New Roman; font-size: 10pt; width: 12%;"><em style="font: inherit;">&#xa0;</em></td><td style="font-family: Times New Roman; font-size: 10pt; width: 1%;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt; width: 1%;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt; width: 1%;">&#xa0;</td><td style="text-align: right; font-family: Times New Roman; font-size: 10pt; width: 12%;"><em style="font: inherit;">&#xa0;</em></td><td style="font-family: Times New Roman; font-size: 10pt; width: 1%;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"><td style="font-family: Times New Roman; font-size: 10pt; width: 40%;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Granted</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"><ix:nonFraction id="c84240915" contextRef="d_2021-01-01_2021-03-31" unitRef="Share" name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross" scale="0" format="ixt:numdotdecimal" decimals="INF">48,300</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"><ix:nonFraction id="c84240916" contextRef="d_2021-01-01_2021-03-31" unitRef="USDPerShare" name="us-gaap:ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice" scale="0" format="ixt:numdotdecimal" decimals="INF">12.00</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt; width: 1%;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt; width: 1%;">&#xa0;</td><td style="text-align: right; font-family: Times New Roman; font-size: 10pt; width: 12%;"><em style="font: inherit;">&#xa0;</em></td><td style="font-family: Times New Roman; font-size: 10pt; width: 1%;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt; width: 1%;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt; width: 1%;">&#xa0;</td><td style="text-align: right; font-family: Times New Roman; font-size: 10pt; width: 12%;"><em style="font: inherit;">&#xa0;</em></td><td style="font-family: Times New Roman; font-size: 10pt; width: 1%;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"><td style="font-family: Times New Roman; font-size: 10pt; width: 40%;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Cancelled/forfeited</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);">&#xa0;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);">(<ix:nonFraction id="c84240919" contextRef="d_2021-01-01_2021-03-31" unitRef="Share" name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod" scale="0" format="ixt:numdotdecimal" decimals="INF">4,190</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; padding-bottom: 1px;">)</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"><ix:nonFraction id="c84240920" contextRef="d_2021-01-01_2021-03-31" unitRef="USDPerShare" name="us-gaap:ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice" scale="0" format="ixt:numdotdecimal" decimals="INF">75.33</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt; width: 1%;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt; width: 1%;">&#xa0;</td><td style="text-align: right; font-family: Times New Roman; font-size: 10pt; width: 12%;"><em style="font: inherit;">&#xa0;</em></td><td style="font-family: Times New Roman; font-size: 10pt; width: 1%;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt; width: 1%;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt; width: 1%;">&#xa0;</td><td style="text-align: right; font-family: Times New Roman; font-size: 10pt; width: 12%;"><em style="font: inherit;">&#xa0;</em></td><td style="font-family: Times New Roman; font-size: 10pt; width: 1%;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"><td style="font-family: Times New Roman; font-size: 10pt; width: 40%;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Outstanding at March 31, 2022</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 3px double rgb(0, 0, 0);">&#xa0;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"><ix:nonFraction id="c84240923" contextRef="i_2021-03-31" unitRef="Share" name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber" scale="0" format="ixt:numdotdecimal" decimals="INF">116,564</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);">$</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"><ix:nonFraction id="c84240924" contextRef="i_2021-03-31" unitRef="USDPerShare" name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice" scale="0" format="ixt:numdotdecimal" decimals="INF">164.31</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"><ix:nonNumeric contextRef="d_2021-01-01_2021-03-31" name="us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2" id="c84240925" format="ixt-sec:duryear">8.89</ix:nonNumeric></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">$</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"><ix:nonFraction id="c84240926" contextRef="i_2021-03-31" unitRef="USD" name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue" scale="0" format="ixt:numdotdecimal" decimals="INF">23,163</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"><td style="font-family: Times New Roman; font-size: 10pt; width: 40%;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Exercisable at March 31, 2022</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 3px double rgb(0, 0, 0);">&#xa0;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"><ix:nonFraction id="c84240927" contextRef="i_2021-03-31" unitRef="Share" name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber" scale="0" format="ixt:numdotdecimal" decimals="INF">52,849</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);">$</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"><ix:nonFraction id="c84240928" contextRef="i_2021-03-31" unitRef="USDPerShare" name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice" scale="0" format="ixt:numdotdecimal" decimals="INF">346.79</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"><ix:nonNumeric contextRef="d_2021-01-01_2021-03-31" name="us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1" id="c84240929" format="ixt-sec:duryear">8.13</ix:nonNumeric></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">$</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"><ix:nonFraction id="c84240930" contextRef="i_2021-03-31" unitRef="USD" name="us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1" scale="0" format="ixt:numdotdecimal" decimals="INF">1,956</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"><td style="font-family: Times New Roman; font-size: 10pt; width: 40%;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Vested and expected to vest at March 31, 2022</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 3px double rgb(0, 0, 0);">&#xa0;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"><ix:nonFraction id="c84240931" contextRef="i_2021-03-31" unitRef="Share" name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber" scale="0" format="ixt:numdotdecimal" decimals="INF">116,564</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);">$</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"><ix:nonFraction id="c84240932" contextRef="i_2021-03-31" unitRef="USDPerShare" name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice" scale="0" format="ixt:numdotdecimal" decimals="INF">164.31</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"><ix:nonNumeric contextRef="d_2021-01-01_2021-03-31" name="us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageRemainingContractualTerm1" id="c84240933" format="ixt-sec:duryear">8.89</ix:nonNumeric></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">$</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"><ix:nonFraction id="c84240934" contextRef="i_2021-03-31" unitRef="USD" name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue" scale="0" format="ixt:numdotdecimal" decimals="INF">23,163</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#xa0;</td></tr>
</tbody></table>
   </ix:nonNumeric>
   <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">The weighted average grant date fair value of stock option awards granted was $<ix:nonFraction id="c84240871" contextRef="d_2022-01-01_2022-03-31" unitRef="USDPerShare" name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" scale="0" format="ixt:numdotdecimal" decimals="INF">10.90</ix:nonFraction> during the <em style="font: inherit;">three</em> months ended <em style="font: inherit;"> March 31, 2022. </em>The total fair value of options vested during the <em style="font: inherit;">three</em> months ended <em style="font: inherit;"> March 31, 2022 </em>and <em style="font: inherit;">2021</em> was $<ix:nonFraction id="c84240875" contextRef="d_2022-01-01_2022-03-31" unitRef="USD" name="us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1" scale="6" format="ixt:numdotdecimal" decimals="-5">0.3</ix:nonFraction> million and $<ix:nonFraction id="c84240876" contextRef="d_2021-01-01_2021-03-31" unitRef="USD" name="us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1" scale="6" format="ixt:numdotdecimal" decimals="-5">0.2</ix:nonFraction> million, respectively. <ix:nonFraction id="c84240878" contextRef="d_2022-01-01_2022-03-31" unitRef="Share" name="us-gaap:StockIssuedDuringPeriodSharesStockOptionsExercised" scale="0" format="ixt-sec:numwordsen" decimals="-3">No</ix:nonFraction> options were exercised during any of the periods presented. At <em style="font: inherit;"> March&#xa0;</em><em style="font: inherit;">31,</em> <em style="font: inherit;">2022,</em> there was $<ix:nonFraction id="c84240881" contextRef="i_2022-03-31_AwardTypeAxis-EmployeeStockOptionMember" unitRef="USD" name="us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized" scale="6" format="ixt:numdotdecimal" decimals="-5">1.3</ix:nonFraction> million of unrecognized compensation expense that will be recognized over a weighted-average period of <ix:nonNumeric contextRef="d_2022-01-01_2022-03-31_AwardTypeAxis-EmployeeStockOptionMember" name="us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1" id="c84240882" format="ixt-sec:duryear">1.97</ix:nonNumeric> years.</p>
   <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">Options granted were valued using the Black-Scholes-Merton derivative instrument pricing model and assumptions used to value the options granted during the <em style="font: inherit;">three</em> months ended <em style="font: inherit;"> March 31, 2022 </em>were as follows:</p>
   <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
   <ix:nonNumeric contextRef="d_2022-01-01_2022-03-31" name="us-gaap:ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock" id="c2124509" escape="true">
    <table border="0" cellpadding="0" cellspacing="0" class="finTable" style="width: 100%; font-size: 10pt; font-family: Times New Roman; text-indent: 0px;"><tbody><tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"><td style="font-family: Times New Roman; font-size: 10pt; width: 85%;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Expected term (in years)</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"><ix:nonNumeric contextRef="d_2022-01-01_2022-03-31_AwardTypeAxis-EmployeeStockOptionMember" name="us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1" id="c84240935" format="ixt-sec:duryear">5.7</ix:nonNumeric></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Risk-free interest rate</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"><ix:nonFraction id="c84240936" contextRef="d_2022-01-01_2022-03-31_AwardTypeAxis-EmployeeStockOptionMember_RangeAxis-MinimumMember" unitRef="Pure" name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate" scale="-2" format="ixt:numdotdecimal" decimals="3">1.7</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">%</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Expected volatility</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"><ix:nonFraction id="c84240937" contextRef="d_2022-01-01_2022-03-31_AwardTypeAxis-EmployeeStockOptionMember_RangeAxis-MinimumMember" unitRef="Pure" name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate" scale="-2" format="ixt:numdotdecimal" decimals="3">134.7</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">%</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Dividend yield</p> </td><td style="width: 1%; font-family: &quot;Times New Roman&quot;; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;; font-size: 10pt;">&#xa0;</td><td style="width: 12%; font-family: &quot;Times New Roman&quot;; font-size: 10pt; margin-left: 0pt; text-align: right;"><em style="font: inherit;">&#x2014;</em></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;; font-size: 10pt; margin-left: 0pt;">&#xa0;</td></tr>
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   </ix:nonNumeric>
   <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
   <ix:exclude>
    <div class="PGFTR" style="text-align: center; width: 100%">
     <div class="hf-row">
      <div class="hf-cell PGNUM" style="text-align: center; font-size: 10pt; font-family: Times New Roman;">
       <em style="font: inherit;"></em></div></div></div></ix:exclude><ix:exclude><div class="PGBK" style="width: 100%; margin-left: 0pt; margin-right: 0pt"><div class="PGFTR" style="text-align: center; width: 100%"><div class="hf-row"><div class="hf-cell PGNUM" style="text-align: center; font-size: 10pt; font-family: Times New Roman;"><em style="font: inherit;">11</em>
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        &#xa0;
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   <p style="font-family: 'Times New Roman', Times, serif; font-size: 10pt; margin: 0pt; text-align: left">&#xa0;</p>
   <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt 0pt 0pt 8pt;"><b>DIFFUSION PHARMACEUTICALS INC.</b>&#xa0;</p>
   <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
   <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt 0pt 0pt 8pt;"><b>NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS</b></p>
   <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p></ix:exclude><p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;"></p>
   <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;"><i>Restricted Stock Unit Awards</i></p>
   <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">The Company issues restricted stock units ("RSU") to newly elected, non-executive members of the board of directors that vest in six, tri-monthly installments beginning <ix:nonNumeric contextRef="d_2022-01-01_2022-03-31_AwardTypeAxis-RestrictedStockUnitsRSUMember_TitleOfIndividualAxis-DirectorMember" name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1" id="c84240885" format="ixt-sec:durmonth">18</ix:nonNumeric> months after the respective grant date. The fair value of a RSU is equal to the fair market value price of the Company&#x2019;s common stock on the date of grant. RSU expense is recorded on a straight-line basis over the service period.</p>
   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">&#xa0;</p>
   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin: 0pt; text-align: justify; text-indent: 45pt;">The following table summarizes activity related to RSU awards during the period indicated:</p>
   <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
   <ix:nonNumeric contextRef="d_2022-01-01_2022-03-31" name="us-gaap:ScheduleOfShareBasedCompensationRestrictedStockUnitsAwardActivityTableTextBlock" id="c2124510" escape="true">
    <table border="0" cellpadding="0" cellspacing="0" class="finTable" style="width: 100%; font-size: 10pt; font-family: Times New Roman; text-indent: 0px;"><tbody><tr style="vertical-align: bottom;"><td style="font-family: Times New Roman; font-size: 10pt; width: 66%;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt; width: 1%;">&#xa0;</td><td colspan="2" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0); width: 1%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b><b>Number of Units</b></b></p> </td><td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; width: 1%;">&#xa0;</td><td style="font-family: Times New Roman; font-size: 10pt; width: 1%;">&#xa0;</td><td colspan="2" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0); width: 1%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b><b>Weighted average grant</b></b></p> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b><b>date fair value</b></b></p> </td><td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; width: 1%;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"><td style="font-family: Times New Roman; font-size: 10pt; width: 66%;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Balance at January 1, 2022</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 14%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"><ix:nonFraction id="c84240939" contextRef="i_2021-12-31_AwardTypeAxis-RestrictedStockUnitsRSUMember" unitRef="Share" name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" scale="0" format="ixt:numdotdecimal" decimals="INF">5,509</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">$</td><td style="width: 14%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"><ix:nonFraction id="c84240940" contextRef="i_2021-12-31_AwardTypeAxis-RestrictedStockUnitsRSUMember" unitRef="USDPerShare" name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue" scale="0" format="ixt:numdotdecimal" decimals="INF">34.78</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"><td style="font-family: Times New Roman; font-size: 10pt; width: 66%;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Vested (1)</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);">&#xa0;</td><td style="width: 14%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);">(<ix:nonFraction id="c84240941" contextRef="d_2022-01-01_2022-03-31_AwardTypeAxis-RestrictedStockUnitsRSUMember" unitRef="Share" name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod" scale="0" format="ixt:numdotdecimal" decimals="INF">327</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; padding-bottom: 1px;">)</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 14%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"><ix:nonFraction id="c84240942" contextRef="d_2022-01-01_2022-03-31_AwardTypeAxis-RestrictedStockUnitsRSUMember" unitRef="USDPerShare" name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue" scale="0" format="ixt:numdotdecimal" decimals="INF">25.50</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#xa0;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"><td style="font-family: Times New Roman; font-size: 10pt; width: 66%;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Outstanding at March 31, 2022</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 14%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"><ix:nonFraction id="c84240943" contextRef="i_2022-03-31_AwardTypeAxis-RestrictedStockUnitsRSUMember" unitRef="Share" name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" scale="0" format="ixt:numdotdecimal" decimals="INF">5,182</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">$</td><td style="width: 14%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"><ix:nonFraction id="c84240944" contextRef="i_2022-03-31_AwardTypeAxis-RestrictedStockUnitsRSUMember" unitRef="USDPerShare" name="us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue" scale="0" format="ixt:numdotdecimal" decimals="INF">35.36</ix:nonFraction></td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#xa0;</td></tr>
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   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin: 0pt;">&#xa0;</p>
   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin: 0pt;">(<em style="font: inherit;">1</em>) The RSUs vested during the <em style="font: inherit;">three</em> months ended <em style="font: inherit;"> March 31, 2022 </em>were settled on a hybrid basis. The Company withheld <ix:nonFraction id="c84240888" contextRef="d_2022-01-01_2022-03-31_AwardTypeAxis-RestrictedStockUnitsRSUMember" unitRef="Share" name="us-gaap:SharesPaidForTaxWithholdingForShareBasedCompensation" scale="0" format="ixt:numdotdecimal" decimals="INF">120</ix:nonFraction> shares of common stock and, in lieu of delivering such shares, paid the RSU holder an amount in cash equal to the fair market value of such shares on vesting date, representing the holder's approximate tax liability associated with such vesting amount in cash equal to the fair market value of such shares on vesting date, representing the holder's approximate tax liability associated with such vesting.</p>
   <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">The Company recognized approximately $<ix:nonFraction id="c84240889" contextRef="d_2022-01-01_2022-03-31_AwardTypeAxis-RestrictedStockMember" unitRef="USD" name="us-gaap:AllocatedShareBasedCompensationExpense" scale="0" format="ixt:numdotdecimal" decimals="INF">16,000</ix:nonFraction> and $<ix:nonFraction id="c84240890" contextRef="d_2021-01-01_2021-03-31_AwardTypeAxis-RestrictedStockMember" unitRef="USD" name="us-gaap:AllocatedShareBasedCompensationExpense" scale="0" format="ixt:numdotdecimal" decimals="INF">5,000</ix:nonFraction> in expense related to these awards during the <em style="font: inherit;">three</em> months ended <em style="font: inherit;"> March&#xa0;</em><em style="font: inherit;">31,</em> <em style="font: inherit;">2022</em> and <em style="font: inherit;"> March 31, 2021, </em>respectively. At <em style="font: inherit;"> March&#xa0;</em><em style="font: inherit;">31,</em> <em style="font: inherit;">2022,</em> there was approximately $<ix:nonFraction id="c84240896" contextRef="i_2022-03-31_AwardTypeAxis-RestrictedStockUnitsRSUMember" unitRef="USD" name="us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized" scale="6" format="ixt:numdotdecimal" decimals="-5">0.1</ix:nonFraction> million of unrecognized compensation cost that will be recognized over a weighted average period of <ix:nonNumeric contextRef="d_2022-01-01_2022-03-31_AwardTypeAxis-RestrictedStockUnitsRSUMember" name="us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1" id="c84240897" format="ixt-sec:duryear">1.90</ix:nonNumeric> years.</p>
   <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
   <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"><ix:exclude>&#xa0;</ix:exclude></p>
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   <table border="0" cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;width:100%;margin-left:auto;margin-right:auto;"><tbody><tr><td style="vertical-align:top;width:9%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;"><b><em style="font: inherit;">9.</em></b></p> </td><td style="vertical-align:top;width:91.6%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;"><b>Commitments and Contingencies</b></p> </td></tr>
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   <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin: 0pt; text-indent: 9pt;"><i>Office Space Lease Commitment</i></p>
   <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">The Company has short term agreements to utilize membership-based co-working space in both Charlottesville, Virginia and Philadelphia, Pennsylvania. Rent expense related to the Company's short-term agreements was approximately $<ix:nonFraction id="c84240946" contextRef="d_2022-01-01_2022-03-31" unitRef="USD" name="us-gaap:OperatingLeasePayments" scale="0" format="ixt:numdotdecimal" decimals="INF">9,000</ix:nonFraction> and $<ix:nonFraction id="c84240947" contextRef="d_2021-01-01_2021-03-31" unitRef="USD" name="us-gaap:OperatingLeasePayments" scale="0" format="ixt:numdotdecimal" decimals="INF">31,000</ix:nonFraction> for the <em style="font: inherit;">three</em> months ended <em style="font: inherit;"> March&#xa0;</em><em style="font: inherit;">31,</em> <em style="font: inherit;">2022</em> and <em style="font: inherit;">2021,</em> respectively.</p>
   <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin: 0pt; text-indent: 9pt;"><i>Research and Development Arrangements</i></p>
   <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">In the course of normal business operations, the Company enters into agreements with universities and CROs to assist in the performance of research and development activities and contract manufacturers to assist with chemistry, manufacturing, and controls related expenses. Expenditures to CROs represent a significant cost in clinical development for the Company. The Company could also enter into additional collaborative research, contract research, manufacturing, and supplier agreements in the future, which <em style="font: inherit;"> may </em>require upfront payments and long-term commitments of cash.</p>
   <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin: 0pt; text-indent: 9pt;"><i>Defined Contribution Retirement Plan</i></p>
   <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">The Company has established its <em style="font: inherit;">401</em>(k) Plan, which covers all employees who qualify under the terms of the plan. Eligible employees <em style="font: inherit;"> may </em>elect to contribute to the <em style="font: inherit;">401</em>(k) Plan up to <ix:nonFraction id="c84240954" contextRef="d_2022-01-01_2022-03-31" unitRef="Pure" name="us-gaap:DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent" scale="-2" format="ixt:numdotdecimal" decimals="1">90</ix:nonFraction>% of their compensation, limited by the IRS-imposed maximum. The Company provides a safe harbor match with a maximum amount of <ix:nonFraction id="c84240955" contextRef="d_2022-01-01_2022-03-31" unitRef="Pure" name="us-gaap:DefinedContributionPlanEmployerMatchingContributionPercent" scale="-2" format="ixt:numdotdecimal" decimals="2">4</ix:nonFraction>% of the participant&#x2019;s compensation. The Company made matching contributions under the <em style="font: inherit;">401</em>(k) Plan of approximately $<ix:nonFraction id="c84240957" contextRef="d_2022-01-01_2022-03-31" unitRef="USD" name="us-gaap:DefinedContributionPlanEmployerDiscretionaryContributionAmount" scale="0" format="ixt:numdotdecimal" decimals="INF">27,000</ix:nonFraction> and $<ix:nonFraction id="c84240958" contextRef="d_2021-01-01_2021-03-31" unitRef="USD" name="us-gaap:DefinedContributionPlanEmployerDiscretionaryContributionAmount" scale="0" format="ixt:numdotdecimal" decimals="INF">16,000</ix:nonFraction> for the <em style="font: inherit;">three</em> months ended <em style="font: inherit;"> March 31, 2022 </em>and <em style="font: inherit;">2021,</em> respectively.</p>
   <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin: 0pt; text-indent: 9pt;"><i>Legal Proceedings</i></p>
   <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">On <em style="font: inherit;"> August 7, 2014, </em>a complaint was filed in the Superior Court of Los Angeles County, California by Paul Feller, the former Chief Executive Officer of the Company&#x2019;s legal predecessor under the caption Paul Feller v. RestorGenex Corporation, Pro Sports &amp; Entertainment, Inc., ProElite, Inc. and Stratus Media Group, GmbH (Case <em style="font: inherit;">No.</em> <em style="font: inherit;">BC553996</em>). The complaint asserts various causes of action, including, among other things, promissory fraud, negligent misrepresentation, breach of contract, breach of employment agreement, breach of the covenant of good faith and fair dealing, violations of the California Labor Code and common counts. The plaintiff is seeking, among other things, compensatory damages in an undetermined amount, punitive damages, accrued interest and an award of attorneys&#x2019; fees and costs. On <em style="font: inherit;"> December 30, 2014, </em>the Company filed a petition to compel arbitration and a motion to stay the action. On <em style="font: inherit;"> April 1, 2015, </em>the plaintiff filed a petition in opposition to the Company&#x2019;s petition to compel arbitration and a motion to stay the action. After a related hearing on <em style="font: inherit;"> April 14, 2015, </em>the court granted the Company&#x2019;s petition to compel arbitration and a motion to stay the action. On <em style="font: inherit;"> January 8, 2016, </em>the plaintiff filed an arbitration demand with the American Arbitration Association. On <em style="font: inherit;"> November 19, 2018 </em>at an Order to Show Cause Re Dismissal Hearing, the court found sufficient grounds <em style="font: inherit;">not</em> to dismiss the case and an arbitration hearing was scheduled, originally for <em style="font: inherit;"> November 2020 </em>but later postponed due to the COVID-<em style="font: inherit;">19</em> pandemic and related restrictions on gatherings in the State of California. In addition, following the <em style="font: inherit;"> November 2018 </em>hearing, an automatic stay was placed on the arbitration in connection with the plaintiff filing for personal bankruptcy protection. On <em style="font: inherit;"> October 22, 2021, </em>following a determination by the bankruptcy trustee <em style="font: inherit;">not</em> to pursue the claims and release them back to the plaintiff, the parties entered into a stipulation to abandon arbitration and return the matter to state court. A case management conference was held on <em style="font: inherit;"> February 23, 2022 </em>at which a trial date of <em style="font: inherit;"> May 24, 2023 </em>was set, and the parties have agreed to stipulate to mediation in advance of the trial.</p>
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   <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt 0pt 0pt 8pt;"><b>DIFFUSION PHARMACEUTICALS INC.</b>&#xa0;</p>
   <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
   <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt 0pt 0pt 8pt;"><b>NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS</b></p>
   <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p></ix:exclude><p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"></p>
   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">The Company believes the claims in this matter are without merit and intends to defend itself vigorously. However, at this stage, the Company is unable to predict the outcome and possible loss or range of loss, if any, associated with its resolution or any potential effect the matter <em style="font: inherit;"> may </em>have on the Company&#x2019;s financial position. Depending on the outcome or resolution of this matter, it could have a material effect on the Company&#x2019;s financial position, results of operations and cash flows.</p>
   <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
   <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"><ix:exclude>&#xa0;</ix:exclude></p>
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   <table border="0" cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;width:100%;margin-left:auto;margin-right:auto;"><tbody><tr><td style="vertical-align:top;width:9%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;"><b><em style="font: inherit;">10.</em></b></p> </td><td style="vertical-align:top;width:91.6%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;"><b>Subsequent Events</b></p> </td></tr>
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   <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt;"><i>Special Meeting, Series C Preferred Stock Conversion, Charter Amendment, and Reverse Stock Split</i></p>
   <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt;">&#xa0;</p>
   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">On <em style="font: inherit;"> April 18, 2022, </em>at the Special Meeting, the Company's stockholders approved an amendment to the Company&#x2019;s certificate of incorporation, as amended, to effect a reverse stock split of the Company&#x2019;s outstanding shares of common stock by a ratio of any whole number between <em style="font: inherit;">1</em>-for-<ix:nonFraction id="c84240975" contextRef="d_2022-04-18_2022-04-18_NonmonetaryTransactionTypeAxis-ReverseStockSplitMember_RangeAxis-MinimumMember_SubsequentEventTypeAxis-SubsequentEventMember" unitRef="Pure" name="us-gaap:StockholdersEquityNoteStockSplitConversionRatio1" scale="0" format="ixt:numdotdecimal" decimals="INF">2</ix:nonFraction> and <em style="font: inherit;">1</em>-for-<ix:nonFraction id="c84240977" contextRef="d_2022-04-18_2022-04-18_NonmonetaryTransactionTypeAxis-ReverseStockSplitMember_RangeAxis-MaximumMember_SubsequentEventTypeAxis-SubsequentEventMember" unitRef="Pure" name="us-gaap:StockholdersEquityNoteStockSplitConversionRatio1" scale="0" format="ixt:numdotdecimal" decimals="INF">50</ix:nonFraction>, at any time prior to <em style="font: inherit;"> December 31, 2022, </em>the implementation and timing thereof subject to the discretion of the Company&#x2019;s board of directors.</p>
   <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">Following the completion of the Special Meeting, in accordance with Section <em style="font: inherit;">8</em>(a) of the Series C Certificate, the Company delivered to the holders of the Series C Preferred Stock written notice of the Company&#x2019;s intent to implement the Reverse Stock Split and the Mandatory Conversion (as defined in the Series C Certificate) of all <ix:nonFraction id="c84240979" contextRef="d_2022-04-18_2022-04-18_ConversionOfStockByUniqueDescriptionAxis-ConversionOfSeriesCPreferredStockIntoCommonStockMember_SubsequentEventTypeAxis-SubsequentEventMember" unitRef="Share" name="us-gaap:ConversionOfStockSharesConverted1" scale="0" format="ixt:numdotdecimal" decimals="INF">10,000</ix:nonFraction> shares of Series C Preferred Stock outstanding into an aggregate of <ix:nonFraction id="c84240980" contextRef="d_2022-04-18_2022-04-18_ConversionOfStockByUniqueDescriptionAxis-ConversionOfSeriesCPreferredStockIntoCommonStockMember_SubsequentEventTypeAxis-SubsequentEventMember" unitRef="Share" name="us-gaap:ConversionOfStockSharesIssued1" scale="0" format="ixt:numdotdecimal" decimals="INF">200</ix:nonFraction> shares of the Company&#x2019;s common stock.</p>
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   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin: 0pt; text-indent: 45pt; text-align: justify;">As described in further detail above under, <i>Note <em style="font: inherit;">3.</em> Basis of Presentation and Summary of Significant Accounting Policies</i>, on <em style="font: inherit;"> April 18, 2022, </em>following the completion of the Special Meeting and the Series C Preferred Stock conversion, &#xa0;the Company implemented the Reverse Stock Split at a ratio of <em style="font: inherit;">1</em>-for-<ix:nonFraction id="c84240983" contextRef="d_2022-04-18_2022-04-18_NonmonetaryTransactionTypeAxis-ReverseStockSplitMember_SubsequentEventTypeAxis-SubsequentEventMember" unitRef="Pure" name="us-gaap:StockholdersEquityNoteStockSplitConversionRatio1" scale="0" format="ixt:numdotdecimal" decimals="INF">50</ix:nonFraction> and beginning with the opening of trading on <em style="font: inherit;"> April 19, 2022, </em>the Company&#x2019;s common stock was available for trading on the Nasdaq Capital Market on a Reverse Stock Split adjusted basis.</p>
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   <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;"><i>Nasdaq Bid Price Requirement Compliance</i></p>
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   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">On <em style="font: inherit;"> May 3, 2022, </em>the Company received a written notice from the Nasdaq Staff confirming that the Company has regained compliance with Nasdaq Listing Rule <em style="font: inherit;">5550</em>(a)(<em style="font: inherit;">2</em>) because the bid price for the Company&#x2019;s common stock had closed above <em style="font: inherit;">$1.00</em> per share for the previous <em style="font: inherit;">ten</em> (<em style="font: inherit;">10</em>) consecutive business days ending <em style="font: inherit;"> May 2, 2022. </em>As previously reported, on <em style="font: inherit;"> May 6, 2021, </em>the Company received a written notice from the Nasdaq Staff indicating that the Company was <em style="font: inherit;">not</em> in compliance with Nasdaq Listing Rule <em style="font: inherit;">5550</em>(a)(<em style="font: inherit;">2</em>) because the bid price for the Company&#x2019;s common stock had closed below <em style="font: inherit;">$1.00</em> per share for the previous <em style="font: inherit;">30</em> consecutive business day. The <em style="font: inherit;"> May 3, 2022 </em>letter confirmed this matter is now closed.</p>
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     <td style="vertical-align:top;width:88%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;"><b>MANAGEMENT</b>&#x2019;<b>S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS</b></p> </td>
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  <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">You should read the following discussion of our financial condition and results of operations together with the unaudited interim consolidated financial statements and the notes thereto included elsewhere in this report and other financial information included in this report. The following discussion may contain predictions, estimates and other forward-looking statements that involve a number of risks and uncertainties, including those discussed under &#x201c;<i>Part I </i>&#x2014;<i> Item 2. Management</i>&#x2019;<i>s Discussion and Analysis of Financial Condition and Results of Operations</i>&#x2014;<i>Special Note Regarding Forward-Looking Statements</i>&#x201d; in this report and under &#x201c;<i>Part I </i>&#x2014;<i> Item 1A. Risk Factors</i>&#x201d; in our Annual Report. These risks could cause our actual results to differ materially from any future performance suggested below.</p>
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  <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;text-indent:9pt;"><b>Diffusion Pharmaceuticals: Enhancing Oxygen, Fueling Life</b></p>
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  <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">We are a biopharmaceutical company developing novel therapies that enhance the body&#x2019;s ability to deliver oxygen to the areas where it is needed most. Our lead product candidate, TSC, is being developed to enhance the diffusion of oxygen to tissues with low oxygen levels, also known as hypoxia, a serious complication of many of medicine&#x2019;s most intractable and difficult-to-treat conditions.</p>
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  <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt;"><b>Highlights from the First Quarter of 2022</b></p>
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     <td style="width: auto;"> <p style="font-family: Times New Roman;font-size: 10pt;font-variant:normal;text-align:justify;margin:0pt;"><i>Completed Dosing in the Altitude Trial</i>&#xa0;&#x2013;&#xa0;On April 11, 2022, we announced the final participant in the Altitude Trial had completed dosing, and topline data is expected to be available in June 2022. We also reported the clinical investigators will be presenting abstracts at the Undersea &amp; Hyperbaric Medical Society&#x2019;s Annual Scientific Meeting in Reno, Nevada scheduled for May 22&#xa0;to 26, 2022&#xa0;based on blinded, aggregated (placebo and treatment), interim physiological data from the first fifteen participants in the study.</p> </td>
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     <td style="width: auto;"> <p style="font-family: Times New Roman;font-size: 10pt;font-variant:normal;text-align:justify;margin:0pt;"><i>Continued Progress the ILD-DLCO Trial </i>&#x2013;&#xa0;Enrollment of patients in the ILD-DLCO Trial, which commenced in December 2021, continued in the first quarter. We currently expect to complete dosing in the second half of 2022, with topline results reported within two months of study completion.</p> </td>
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     <td style="width: auto;"> <p style="font-family: Times New Roman;font-size: 10pt;font-variant:normal;text-align:justify;margin:0pt;"><i>Expanded Scientific Advisory Board </i>&#x2013;&#xa0;On February 24, 2022, we announced a significant expansion of our Scientific Advisory Board to include five prominent radiation and medical oncologists, who will help guide the design of our recently announced Hypoxic Solid Tumor Program.</p> </td>
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  <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;text-indent:9pt;"><b>Business Update</b></p>
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  <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">In the first quarter of 2022, we continued to advance the development of TSC for the treatment of hypoxia and as a platform to enhance standard-of-care treatment for conditions complicated by hypoxia with a particular near-term focus on hypoxic solid tumors.</p>
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  <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">As of the date of the Quarterly Report, TSC has been administered to more than 220 subjects across 11 clinical trials. Data from these clinical trials support our understanding of the safety, tolerability, pharmacokinetics and pharmacodynamic effects of TSC. Evidence of clinical effect with TSC was reported from a Phase 2 clinical study conducted in patients with PAD with claudication. In addition, post hoc analyses of two prior studies involving patients with COVID-19 and unresected GBM tumors have provided preliminary evidence of TSC&#x2019;s potential. Although the results small Phase 2 studies were not statistically significant, we believe the results were compelling and subsequent analyses helped identify certain data gaps that have been focus of recent development, including the relationship between TSC &#xa0;dose and oxygenation.</p>
  <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
  <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">During 2021, to address these identified gaps in our TSC knowledge base, and guide the future of our TSC development program, we designed and executed on our Oxygenation Trials. The Oxygenation Trials are a series of three short-term, clinical studies designed to provide clinical evidence of the relationship between TSC dose and the effects on oxygenation, each specifically tailored to evaluate the effects of TSC on a different component of the oxygen delivery pathway. We completed the first of these studies, the TCOM Trial, in March 2021. The first participants in the second Oxygenation Trial, the Altitude Trial, were dosed in November 2021 and on April 11, 2022, we announced the completion of dosing for the final participant in the study. Topline data from the Altitude Trial are expected to be available in June 2022. In December 2021 we announced the dosing of the first patients in the final Oxygenation Trial, the ILD-DLCO Trial. We currently expect to complete dosing in this study in the second half of 2022 and to report top line results within two months of study completion.</p>
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  <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin: 0pt; text-indent: 45pt; text-align: justify;">The extensive preclinical and clinical data regarding TSC obtained to date, including data recently obtained from our Oxygenation Trials and our COVID-19 Trial completed in February 2021, provide significant information related to TSC&#x2019;s effects on oxygenation, dose response characteristics, pharmacokinetics, and pharmacodynamics. In November 2021, based on the available data and the significant unmet medical need, we announced our intention to focus the next steps in our efforts to develop TSC as an adjunct to standard of care therapy for hypoxic solid tumors. We believe the aforementioned collection of information will allow us to be more efficient and increase our likelihood of success, compared to the Company&#x2019;s past efforts to develop TSC as a cancer treatment, which were terminated in 2019 due to financial constraints.</p>
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  <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">During the first quarter of 2022 continued to work with our advisors including our new Scientific Advisory Board members announced in February 2022, on the design of the Hypoxic Solid Tumor Program including the preliminary design of our Planned Phase 2 Hypoxic Tumor Trial protocol and updating our oncology-related IND previously filed with the FDA.</p>
  <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
  <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">We currently expect to commence our Planned Phase 2 Hypoxic Tumor Trial in the second half of 2022, subject to FDA feedback and the availability of clinical drug supply.</p>
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  <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin: 0pt; text-align: justify; text-indent: 45pt;">In parallel, we continue to undertake preclinical studies and other opportunities to obtain additional data designed to demonstrate TSC&#x2019;s potential uses in a broad spectrum of non-cancer indications, as well as our work to further improve the TSC manufacturing process and support the continued&#xa0; and support the continued availability of high-quality drug product.</p>
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  <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">Finally, we believe we can leverage what we have learned from the development of TSC and the significant skills and experience of our team to opportunistically identify and acquire or in-license novel product candidates that complement TSC and our overall strategy.&#xa0; We also believe diversifying our asset portfolio through and acquisition or in-license would reduce our Company&#x2019;s overall risk profile as an investment.</p>
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  <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;text-indent:9pt;"><b>Financial Summary</b></p>
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  <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">As of March&#xa0;31, 2022, we had cash, cash equivalents and marketable securities of $32.6 million, in the aggregate. We have incurred operating losses since inception, have not generated any product sales revenue and have not achieved profitable operations. We incurred a net loss of $4.5 million for the three months ended March&#xa0;31, 2022. Our accumulated deficit as of March&#xa0;31, 2022 was $134.5 million, and we expect to continue to incur substantial losses in future periods. We also anticipate that our operating expenses will increase substantially as we continue to advance the development of TSC, including any costs related to:</p>
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     <td style="vertical-align:top;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin: 0pt; text-align: justify;">our ongoing and planned clinical trials, including our Planned Phase 2 Hypoxic Tumor Trial;</p> </td>
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     <td style="vertical-align:top;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin: 0pt; text-align: justify;">any additional studies we may undertake, including other preclinical and clinical studies to support the filing of any new drug application with the FDA;</p> </td>
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     <td style="vertical-align:top;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin: 0pt; text-align: justify;">other research, development, and manufacturing activities designed to develop and optimize formulation, manufacturing processes, dosage, dose forms, and other characteristics prior to regulatory approval;</p> </td>
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     <td style="vertical-align:top;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin: 0pt; text-align: justify;">the maintenance, expansion, and protection our global intellectual property portfolio;</p> </td>
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     <td style="vertical-align:top;width:18pt;"> <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#x2022;</p> </td>
     <td style="vertical-align:top;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin: 0pt; text-align: justify;">the hiring of additional clinical, manufacturing, scientific, sales, or other personnel; and</p> </td>
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     <td style="vertical-align:top;width:18pt;"> <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#x2022;</p> </td>
     <td style="vertical-align:top;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin: 0pt; text-align: justify;">investments in operational, financial, and management information systems.</p> </td>
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  <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">We currently intend to use our existing cash, cash equivalents and marketable securities for working capital and to fund the research and development of TSC. We expect that our cash, cash equivalents and marketable securities as of March&#xa0;31, 2022 will enable us to fund our operating expenses and capital expenditure requirements through 2023.</p>
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  <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;text-indent:9pt;"><b>Financial Operations Overview</b></p>
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  <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 9pt;"><i>Revenues</i></p>
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  <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt;text-indent:45pt;">We have not yet generated any revenue from product sales. We do not expect to generate revenue from product sales for the foreseeable future.</p>
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  <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 9pt;"><i>Research and Development Expense</i></p>
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  <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">R&amp;D expenses include, but are not limited to, third-party CRO arrangements and employee-related expenses, including salaries, benefits, stock-based compensation, and travel expense reimbursement. R&amp;D activities are central to our business model. Product candidates in later stages of clinical development generally have higher development costs than those in earlier stages of clinical development, primarily due to the increased size and duration of later-stage clinical studies. As we advance our product candidates, we expect the amount of R&amp;D costs will continue to increase for the foreseeable future. R&amp;D costs are charged to expense as incurred.</p>
  <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
  <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 9pt;"><i>General and Administrative Expense</i></p>
  <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
  <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt;text-indent:45pt;">G&amp;A expenses consist principally of salaries and related costs for executive and other personnel, including stock-based compensation, other employee benefit costs, expenses associated with investment bank and other financial advisory services, and travel expenses. Other G&amp;A expenses include, facility-related costs, communication expenses and professional fees for legal, patent prosecution and maintenance, consulting, accounting, and other professional services.</p>
  <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
  <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 9pt;"><i>Interest Income</i></p>
  <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
  <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt;text-indent:45pt;">Interest income is interest earned from our cash, cash equivalents and marketable securities.</p>
  <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
  <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
  <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin: 0pt; text-indent: 9pt;"><b>Results of Operations for Three Months Ended March</b>&#xa0;<b>31, 2022 Compared to Three Months Ended March</b>&#xa0;<b>31, 2021 </b></p>
  <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
  <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt;text-indent:45pt;">The following table sets forth our results of operations for the three months ended March 31, 2022, and 2021.</p>
  <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
  <table border="0" cellpadding="0" cellspacing="0" class="finTable" style="width: 100%; font-size: 10pt; font-family: Times New Roman; text-indent: 0px;">
   <tbody>
    <tr style="vertical-align: bottom;">
     <td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td>
     <td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td>
     <td colspan="6" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b><b>Three Months Ended March 31,</b></b></p> </td>
     <td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px;">&#xa0;</td>
     <td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td>
     <td style="font-family: Times New Roman; font-size: 10pt;"><b>&#xa0;</b></td>
     <td style="text-align: center; font-family: Times New Roman; font-size: 10pt;"><b>&#xa0;</b></td>
     <td style="font-family: Times New Roman; font-size: 10pt;"><b>&#xa0;</b></td>
    </tr>

    <tr style="vertical-align: bottom;">
     <td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td>
     <td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td>
     <td colspan="2" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b><b>2022</b></b></p> </td>
     <td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px;">&#xa0;</td>
     <td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td>
     <td colspan="2" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b><b>2021</b></b></p> </td>
     <td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px;">&#xa0;</td>
     <td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td>
     <td colspan="2" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b><b>Change</b></b></p> </td>
     <td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px;">&#xa0;</td>
    </tr>

    <tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);">
     <td style="font-family: Times New Roman; font-size: 10pt; width: 55%;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Operating expenses:</p> </td>
     <td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td>
     <td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td>
     <td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td>
     <td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td>
     <td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td>
     <td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td>
     <td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td>
     <td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td>
     <td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td>
     <td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td>
     <td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td>
     <td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td>
    </tr>

    <tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);">
     <td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt; margin-left: 9pt;">Research and development</p> </td>
     <td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td>
     <td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">$</td>
     <td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">2,425,898</td>
     <td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#xa0;</td>
     <td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td>
     <td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">$</td>
     <td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">2,916,378</td>
     <td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#xa0;</td>
     <td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td>
     <td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">$</td>
     <td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">(490,480</td>
     <td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">)</td>
    </tr>

    <tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);">
     <td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt; margin-left: 9pt;">General and administrative</p> </td>
     <td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td>
     <td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td>
     <td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">2,128,552</td>
     <td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#xa0;</td>
     <td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td>
     <td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td>
     <td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">1,743,510</td>
     <td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#xa0;</td>
     <td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td>
     <td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td>
     <td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">385,042</td>
     <td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#xa0;</td>
    </tr>

    <tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);">
     <td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt; margin-left: 9pt;">Depreciation</p> </td>
     <td style="width: 1%; font-family: &quot;Times New Roman&quot;; font-size: 10pt;">&#xa0;</td>
     <td style="width: 1%; font-family: &quot;Times New Roman&quot;; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);">&#xa0;</td>
     <td style="width: 12%; font-family: &quot;Times New Roman&quot;; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0); text-align: right;">&#x2014;</td>
     <td style="width: 1%; font-family: &quot;Times New Roman&quot;; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;">&#xa0;</td>
     <td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td>
     <td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);">&#xa0;</td>
     <td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);">24,447</td>
     <td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;">&#xa0;</td>
     <td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td>
     <td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);">&#xa0;</td>
     <td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);">(24,447</td>
     <td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; padding-bottom: 1px;">)</td>
    </tr>

    <tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);">
     <td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt; margin-left: 18pt;">Loss from operations</p> </td>
     <td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td>
     <td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td>
     <td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">4,554,450</td>
     <td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#xa0;</td>
     <td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td>
     <td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td>
     <td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">4,684,335</td>
     <td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#xa0;</td>
     <td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td>
     <td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td>
     <td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">(129,885</td>
     <td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">)</td>
    </tr>

    <tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);">
     <td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Other income:</p> </td>
     <td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td>
     <td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td>
     <td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td>
     <td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td>
     <td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td>
     <td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td>
     <td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td>
     <td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td>
     <td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td>
     <td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td>
     <td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td>
     <td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td>
    </tr>

    <tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);">
     <td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt; margin-left: 9pt;">Interest income</p> </td>
     <td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px;">&#xa0;</td>
     <td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);">&#xa0;</td>
     <td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);">(27,809</td>
     <td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; padding-bottom: 1px;">)</td>
     <td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px;">&#xa0;</td>
     <td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);">&#xa0;</td>
     <td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);">(40,416</td>
     <td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; padding-bottom: 1px;">)</td>
     <td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px;">&#xa0;</td>
     <td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);">&#xa0;</td>
     <td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);">12,607</td>
     <td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; padding-bottom: 1px;">&#xa0;</td>
    </tr>

    <tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);">
     <td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Net loss</p> </td>
     <td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td>
     <td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);">$</td>
     <td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);">(4,526,641</td>
     <td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; padding-bottom: 3px;">)</td>
     <td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td>
     <td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);">$</td>
     <td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);">(4,643,919</td>
     <td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; padding-bottom: 3px;">)</td>
     <td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td>
     <td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);">$</td>
     <td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);">117,278</td>
     <td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; margin-left: 0pt;">&#xa0;</td>
    </tr>

   </tbody>
  </table>
  <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
  <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">We recognized $2.4 million in research and development expenses during the three months ended March 31, 2022 compared to $2.9 million during the three months ended March 31, 2021. A significant portion of this decrease was attributable to the timing of clinical trials and drug manufacturing, offset by an increase in salaries and wages and stock-based compensation related to increased headcount.</p>
  <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
  <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">General and administrative expenses increased by $0.4 million during the three months ended March 31, 2022 compared to the three months ended March 31, 2021, mainly due to an increase in salaries and wages and stock-based compensation related to increased headcount as well as an increase in outside professional fees.</p>
  <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
  <div class="PGBK" style="width: 100%; margin-left: 0pt; margin-right: 0pt">
   <div class="PGFTR" style="text-align: center; width: 100%">
    <div class="hf-row">
     <div class="hf-cell PGNUM" style="text-align: center; font-size: 10pt; font-family: Times New Roman;">
       16
     </div>
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   <hr style="PAGE-BREAK-AFTER: always; border: none; width: 100%; height: 2px; color: #000000; background-color: #000000" />
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       &#xa0;
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  <p style="font-family: 'Times New Roman', Times, serif; font-size: 10pt; margin: 0pt; text-align: left">&#xa0;</p>
  <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt;text-indent:45pt;">The decrease in depreciation for the three months ended March 31, 2022 compared to the three months ended March 31, 2021 is related to the disposal of property and equipment during the year-ended December 31, 2021.</p>
  <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
  <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">The decrease in interest income for the three months ended March 31, 2022 compared to the three months ended March 31, 2021 is primarily attributable to lower interest earned on cash and investments during the three months ended March 31, 2022 compared to the three months ended March 31, 2021.</p>
  <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt;">&#xa0;</p>
  <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
  <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin: 0pt; text-indent: 9pt;"><b>Liquidity and Capital Resources</b></p>
  <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
  <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 9pt;"><i>Working Capital</i></p>
  <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
  <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">As of March&#xa0;31, 2022, we had $9.9 million in cash and cash equivalents, $22.7 million in marketable securities, working capital of $30.6 million and an accumulated deficit of $134.5 million. We expect to continue to incur net losses for the foreseeable future. We intend to use our existing cash, cash equivalents and marketable securities to fund our working capital and research and development of our product candidates.</p>
  <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
  <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 9pt;"><i>Cash Flows</i></p>
  <p style="font-family: &quot;Times New Roman&quot;; font-size: 10pt; font-variant: normal; margin: 0pt; text-align: justify; text-indent: 45pt;">&#xa0;</p>
  <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt;text-indent:45pt;">The following table sets forth our cash flows for the three months ended March&#xa0;31, 2022 and 2021:</p>
  <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
  <table border="0" cellpadding="0" cellspacing="0" class="finTable" style="width: 100%; font-size: 10pt; font-family: Times New Roman; text-indent: 0px;">
   <tbody>
    <tr style="vertical-align: bottom;">
     <td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td>
     <td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td>
     <td colspan="6" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b><b>Three Months Ended March 31, </b></b></p> </td>
     <td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px;">&#xa0;</td>
    </tr>

    <tr style="vertical-align: bottom;">
     <td style="font-family: Times New Roman; font-size: 10pt; width: 70%;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Net cash (used in) provided by:</p> </td>
     <td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td>
     <td colspan="2" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b><b>2022</b></b></p> </td>
     <td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px;">&#xa0;</td>
     <td style="font-family: Times New Roman; font-size: 10pt;">&#xa0;</td>
     <td colspan="2" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b><b>2021</b></b></p> </td>
     <td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px;">&#xa0;</td>
    </tr>

    <tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);">
     <td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Operating activities</p> </td>
     <td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td>
     <td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">$</td>
     <td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">(4,729,813</td>
     <td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">)</td>
     <td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td>
     <td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">$</td>
     <td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">(5,176,370</td>
     <td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">)</td>
    </tr>

    <tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);">
     <td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Investing activities</p> </td>
     <td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td>
     <td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td>
     <td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">(22,716,415</td>
     <td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">)</td>
     <td style="width: 1%; font-family: &quot;Times New Roman&quot;; font-size: 10pt;">&#xa0;</td>
     <td style="width: 1%; font-family: &quot;Times New Roman&quot;; font-size: 10pt;">&#xa0;</td>
     <td style="width: 12%; font-family: &quot;Times New Roman&quot;; font-size: 10pt; margin-left: 0pt; text-align: right;">&#x2014;</td>
     <td style="width: 1%; font-family: &quot;Times New Roman&quot;; font-size: 10pt; margin-left: 0pt;">&#xa0;</td>
    </tr>

    <tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);">
     <td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Financing activities</p> </td>
     <td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td>
     <td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);">&#xa0;</td>
     <td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);">5,000</td>
     <td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;">&#xa0;</td>
     <td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td>
     <td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);">&#xa0;</td>
     <td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);">33,295,752</td>
     <td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;">&#xa0;</td>
    </tr>

    <tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);">
     <td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Net (decrease) increase in cash and cash equivalents</p> </td>
     <td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td>
     <td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);">$</td>
     <td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);">(27,441,228</td>
     <td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; padding-bottom: 3px;">)</td>
     <td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#xa0;</td>
     <td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);">$</td>
     <td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);">28,119,382</td>
     <td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; margin-left: 0pt;">&#xa0;</td>
    </tr>

   </tbody>
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  <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
  <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt;text-indent:9pt;"><i>Operating Activities</i></p>
  <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
  <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">Net cash used in operating activities of $4.7 million during the three months ended March 31, 2022 was primarily attributable to our net loss of $4.5 million and our net change in operating assets and liabilities of $0.5 million. This amount was offset by $0.3 million in stock-based compensation expense. The net change in our operating assets and liabilities is primarily attributable to an increase in our prepaid expenses, deposits and other current assets.</p>
  <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
  <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">Net cash used in operating activities of $5.2 million during the three months ended March 31, 2021 was primarily attributable to our net loss of $4.6 million and our net change in operating assets and liabilities of $0.7 million. This amount was offset by $0.2 million in stock-based compensation expense and depreciation expense. The net change in our operating assets and liabilities is primarily attributable to a decrease in our accrued expenses and other current liabilities due to the timing of our payments to our vendors and employees as well as an increase in our prepaid expenses, deposits and other current assets.</p>
  <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
  <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt;text-indent:9pt;"><i>Investing Activities</i></p>
  <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
  <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">During the three months ended March 31, 2022, we purchased $22.7 million in marketable securities with cash. There were no investing activities during the three months ended March 31, 2021.</p>
  <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
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       17
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  <p style="font-family: 'Times New Roman', Times, serif; font-size: 10pt; margin: 0pt; text-align: left">&#xa0;</p>
  <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt;text-indent:9pt;"><i>Financing Activities</i></p>
  <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
  <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">Net cash provided by financing activities was $5,000 during the three months ended March 31, 2022, attributable to proceeds received from the sale of our Series C Convertible Preferred Stock.</p>
  <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
  <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">Net cash provided by financing activities was $33.3 million during the three months ended March 31, 2021, attributable to net proceeds of $31.1 million received from the sale of our common stock and $2.2 million in proceeds received from the exercise of common stock warrants.</p>
  <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
  <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt;text-indent:9pt;"><i>Capital Requirements</i></p>
  <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
  <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">We currently expect to continue to incur substantial expenses and generate significant operating losses as we continue to pursue our business strategy of developing TSC. Our operations have consumed substantial amounts of cash since inception and we currently expect to continue to spend substantial amounts of cash to advance the clinical development of TSC and any other product candidates we may in-license or acquire in the future. As of the date of this Quarterly Report, most of our cash resources for clinical development are dedicated to our ongoing and planned clinical trials. While we believe we have adequate cash resources to continue operations through 2023, we anticipate that we will need additional funding in order to complete development of TSC which, if available, could be obtained through additional capital raising transactions, entry into strategic partnerships or collaborations, or alternative financing arrangements.</p>
  <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
  <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt;text-indent:45pt;">As of March&#xa0;31, 2022, we did not have any credit facilities in place under which we could borrow funds or any other sources of committed capital. In the future, we may seek to raise additional funds through various sources. However, we can give no assurances that we will be able to secure additional sources of funds to support our operations, or if such funds are available to us, that such additional financing will be sufficient to meet our needs or be on terms acceptable to us. This risk may increase if economic and market conditions deteriorate. If we are unable to obtain additional financing when needed, we may need to terminate, significantly modify, or delay the development of TSC or our product candidates, or we may need to obtain funds through collaborations or otherwise on terms that may require us to relinquish rights to our technologies or product candidates that we might otherwise seek to develop or commercialize independently. If we are unable to raise adequate additional capital as and when required in the future, we could be forced to cease development activities and terminate our operations, and you could experience a complete loss of your investment.</p>
  <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
  <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">To the extent that we raise additional capital in the future through the sale of our common stock or securities convertible or exchangeable for common stock such as common stock warrants, convertible preferred stock, or convertible debt instruments, the interests of our current stockholders may be diluted or otherwise impacted. In particular, specific rights granted to future holders of preferred stock or convertible debt securities may include voting rights, preferences as to dividends and liquidation, conversion and redemption rights, sinking fund provisions, and restrictions on our ability to merge with or sell our assets to a third party. Debt financing, if available, may involve agreements that include covenants limiting or restricting our ability to take specific actions, such as incurring additional debt, making capital expenditures or declaring dividends.</p>
  <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
  <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;text-indent:9pt;">&#xa0;</p>
  <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;text-indent:9pt;"><b>Off-Balance Sheet Arrangements</b></p>
  <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
  <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt;text-indent:45pt;">We do not have any off-balance sheet arrangements, as defined by the rules and regulations of the SEC, that have or are reasonably likely to have a material effect on our financial condition, changes in financial condition, revenue or expenses, results of operations, liquidity, capital expenditures, or capital resources. As a result, we are not materially exposed to any financing, liquidity, market, or credit risk that could arise if we had engaged in these arrangements.</p>
  <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
  <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;text-indent:9pt;"><b>Critical Accounting Policies</b></p>
  <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
  <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">As of the date of this Quarterly Report, the Critical Accounting Policies included in our Annual Report have not changed.</p>
  <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
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       18
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     <td style="vertical-align:top;width:12.5%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;"><b>ITEM 3.</b></p> </td>
     <td style="vertical-align:top;width:88%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;"><b>QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK</b></p> </td>
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  <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
  <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">As a &#x201c;smaller reporting company&#x201d; as defined by Item 10 of Regulation S-K we are not required to provide the information required by this Item 3.</p>
  <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
  <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
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     <td style="vertical-align:top;width:12.5%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;"><b>ITEM 4.</b></p> </td>
     <td style="vertical-align:top;width:88%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;"><b>CONTROLS AND PROCEDURES</b></p> </td>
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  <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
  <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt;text-indent:9pt;"><b>Evaluation of Disclosure Controls and Procedures</b></p>
  <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
  <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">We maintain disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) promulgated under the Exchange Act) that are designed to provide reasonable assurance that information required to be disclosed by us in the reports we file or submit under the Exchange Act is recorded, processed, summarized, and reported within the time periods specified in the SEC&#x2019;s rules and forms and that such information is accumulated and communicated to our management, including our principal executive and principal financial officers, or persons performing similar functions, as appropriate to allow timely decisions regarding required disclosure. In designing and evaluating our disclosure controls and procedures, we recognize that any controls and procedures, no matter how well designed and operated, can provide only reasonable assurance of achieving the desired control objectives, and we are required to apply our judgment in evaluating the cost-benefit relationship of possible internal controls. Our management evaluated, with the participation of our principal executive officer and principal financial officer, the effectiveness of the design and operation of our disclosure controls and procedures as of the end of the period covered in this report. Based on that evaluation, our principal executive officer and principal financial officer concluded that our disclosure controls and procedures were effective as of the end of such period to provide reasonable assurance that information required to be disclosed in our Exchange Act reports is recorded, processed, summarized, and reported within the time periods specified in the SEC&#x2019;s rules and forms, and that such information is accumulated and communicated to our management, including our principal executive officer and principal financial officer, as appropriate to allow timely decisions regarding disclosure.</p>
  <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
  <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt;text-indent:9pt;"><b>Change in Internal Control Over Financial Reporting</b></p>
  <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
  <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt;text-indent:45pt;">There were no changes in our internal control over financial reporting (as such term is defined in Rule 13a-15(f) promulgated under the Exchange Act) that occurred during the period ended March 31, 2022 that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.</p>
  <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt;text-indent:45pt;">&#xa0;</p>
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       19
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  <p style="font-family: 'Times New Roman', Times, serif; font-size: 10pt; margin: 0pt; text-align: left">&#xa0;</p>
  <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;text-indent:9pt;"><b>PART II </b>&#x2013;<b> OTHER INFORMATION</b></p>
  <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
  <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
  <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
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     <td style="vertical-align:top;width:12.5%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;"><b>ITEM 1.</b></p> </td>
     <td style="vertical-align:top;width:88%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;"><b>LEGAL PROCEEDINGS</b></p> </td>
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  <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
  <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">For this item, please refer to <i>Note 9, Commitments and Contingencies</i> in the notes accompanying the unaudited interim consolidated financial statements included in Part I, Item 1 of this Quarterly Report, which is incorporated herein by reference.</p>
  <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
  <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
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     <td style="vertical-align:top;width:12.5%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;"><b>ITEM 1A.</b></p> </td>
     <td style="vertical-align:top;width:88%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;"><b>RISK FACTORS</b></p> </td>
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  <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">As of the date of this Quarterly Report, there have been no material changes to our risk factors previously disclosed in our Annual Report.</p>
  <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
  <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
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     <td style="vertical-align:top;width:88%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;"><b>UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS</b></p> </td>
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  <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;text-indent:9pt;"><b>Unregistered Sales of Equity Securities</b></p>
  <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
  <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">On March 18, 2022, the Company issued and sold to Robert J. Cobuzzi, Jr., Ph.D., its President &amp; Chief Executive Officer, and William R. Elder, its General Counsel &amp; Corporate Secretary, an aggregate of 10,000 shares of Series C Preferred Stock at an offering price of $0.50 per share, representing 100% of the stated value per share of the Series C Preferred Stock, for aggregate gross proceeds of $5,000.</p>
  <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
  <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">The Series C Certificate provides that, among other things, (i) each share of Series C Preferred Stock is convertible into 0.02 shares of the Company's common stock, representing a conversion price of $25.00 per share, subject to certain conditions, (ii) each share of Series C Preferred Stock outstanding is counted on an as converted basis, together with the Company&#x2019;s common stock as a single class, for purposes of determining the presence of a quorum at any meeting at which holders are asked to vote on matters related to the Reverse Stock Split (subject to any applicable exchange listing rules), (iii) each share of Series C Preferred Stock outstanding has the right to cast 1,600 votes per share of Series C Preferred Stock on the Reverse Stock Split on a &#x201c;mirrored&#x201d; basis &#x2014; this means that the holders of the Series C Preferred Stock are required to vote their shares in a manner that &#x201c;mirrors&#x201d; the proportions of &#x201c;For&#x201d; and &#x201c;Against&#x201d; votes cast by the holders of the Company&#x2019;s common stock on the Amendment (excluding, for the avoidance of doubt, any shares of common stock that are not voted), and (iv) the holders of outstanding shares of Series C Preferred Stock are entitled to dividends, on an as converted basis, equal to dividends actually paid, if any, on shares of common stock and participate in any liquidation of the Company on an as converted basis.</p>
  <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
  <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">On April 18, 2022, following approval of the Reverse Stock Split by the Company's stockholders, all 10,000 shares of Series C Preferred Stock were converted into an aggregate of 200 shares of the Company's common stock in accordance with the terms of the Series C Certificate.</p>
  <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
  <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;text-indent:9pt;"><b>Issuer Purchases of Equity Securities</b></p>
  <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
  <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;text-indent:45pt;">None.&#xa0;</p>
  <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
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     <td style="vertical-align:top;width:88%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;"><b>DEFAULTS UPON SENIOR SECURITIES</b></p> </td>
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  <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;text-indent:45pt;">None.</p>
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     <td style="vertical-align:top;width:88%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;"><b>MINE SAFETY DISCLOSURES</b></p> </td>
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  <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;text-indent:45pt;">Not applicable.</p>
  <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
  <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
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     <td style="vertical-align:top;width:12.5%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;"><b>ITEM 5.</b></p> </td>
     <td style="vertical-align:top;width:88%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;"><b>OTHER INFORMATION</b></p> </td>
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  <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
  <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;text-indent:45pt;">None.</p>
  <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
  <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
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     <td style="vertical-align:top;width:12.5%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;"><b>ITEM 6.</b></p> </td>
     <td style="vertical-align:top;width:88%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;"><b>EXHIBITS</b></p> </td>
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  <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
  <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;text-indent:45pt;">See attached Exhibit Index.</p>
  <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;text-indent:9pt;">&#xa0;</p>
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  <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;text-indent:9pt;"><b>DIFFUSION PHARMACEUTICALS INC.</b></p>
  <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
  <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;text-indent:9pt;"><b>QUARTERLY REPORT ON FORM 10-Q</b></p>
  <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;text-indent:9pt;"><b>EXHIBIT INDEX</b></p>
  <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
  <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
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     <td style="border-bottom: 1px solid rgb(0, 0, 0); vertical-align: bottom; width: 8%; border-left: 1px solid rgb(0, 0, 0); border-top: 1px solid rgb(0, 0, 0);"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b>Exhibit</b></p> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b>No.</b></p> </td>
     <td style="border-bottom: 1px solid rgb(0, 0, 0); vertical-align: bottom; width: 67%; border-left: 1px solid rgb(0, 0, 0); border-top: 1px solid rgb(0, 0, 0);"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b>Description</b></p> </td>
     <td style="border-color: rgb(0, 0, 0); border-style: solid; border-width: 1px; vertical-align: bottom; width: 25%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b>Method of Filing</b></p> </td>
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     <td style="border-bottom: 1px solid rgb(0, 0, 0); vertical-align: top; width: 8%; border-left: 1px solid rgb(0, 0, 0);"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;">3.1</p> </td>
     <td style="border-bottom: 1px solid rgb(0, 0, 0); vertical-align: top; width: 67%; border-left: 1px solid rgb(0, 0, 0);"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin: 0pt;"><a href="http://www.sec.gov/Archives/edgar/data/1053691/000143774922009117/ex_359622.htm" style="-sec-extract:exhibit;">Certificate of Amendment to the Certificate of Incorporation, as amended, of Diffusion Pharmaceuticals Inc.</a></p> </td>
     <td style="border-bottom: 1px solid rgb(0, 0, 0); vertical-align: top; width: 25%; border-left: 1px solid rgb(0, 0, 0); border-right: 1px solid rgb(0, 0, 0);"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">Incorporated by reference to Exhibit 3.1 to the registrant's current report on Form 8-K filed on April 18, 2022</p> </td>
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     <td style="border-bottom: 1px solid rgb(0, 0, 0); vertical-align: top; width: 8%; border-left: 1px solid rgb(0, 0, 0);"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;">3.2</p> </td>
     <td style="border-bottom: 1px solid rgb(0, 0, 0); vertical-align: top; width: 67%; border-left: 1px solid rgb(0, 0, 0);"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;"><a href="http://www.sec.gov/Archives/edgar/data/1053691/000143774922006757/ex_348833.htm" style="-sec-extract:exhibit;">Amendment to the Bylaws, as amended, of Diffusion Pharmaceuticals Inc., effective March 18, 2022</a></p> </td>
     <td style="border-bottom: 1px solid rgb(0, 0, 0); vertical-align: top; width: 25%; border-left: 1px solid rgb(0, 0, 0); border-right: 1px solid rgb(0, 0, 0);"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">Incorporated by reference to Exhibit 3.2 to the registrant's current report on Form 8-K filed on March 18, 2022</p> </td>
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     <td style="border-bottom: 1px solid rgb(0, 0, 0); vertical-align: top; width: 8%; border-left: 1px solid rgb(0, 0, 0);"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;">3.3</p> </td>
     <td style="border-bottom: 1px solid rgb(0, 0, 0); vertical-align: top; width: 67%; border-left: 1px solid rgb(0, 0, 0);"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;"><a href="http://www.sec.gov/Archives/edgar/data/1053691/000143774922006757/ex_348832.htm" style="-sec-extract:exhibit;">Certificate of Designation of Preferences, Rights, and Limitations of Series C Convertible Preferred Stock</a></p> </td>
     <td style="border-bottom: 1px solid rgb(0, 0, 0); vertical-align: top; width: 25%; border-left: 1px solid rgb(0, 0, 0); border-right: 1px solid rgb(0, 0, 0);"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">Incorporated by reference to Exhibit 3.1 to the registrant's current report on Form 8-K filed on March 18, 2022</p> </td>
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     <td style="border-bottom: 1px solid rgb(0, 0, 0); vertical-align: top; width: 8%; border-left: 1px solid rgb(0, 0, 0);"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;">10.1</p> </td>
     <td style="border-bottom: 1px solid rgb(0, 0, 0); vertical-align: top; width: 67%; border-left: 1px solid rgb(0, 0, 0);"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;"><a href="http://www.sec.gov/Archives/edgar/data/1053691/000143774922006757/ex_348912.htm" style="-sec-extract:exhibit;">Form of Subscription Agreement between Diffusion Pharmaceuticals Inc. and the investors named therein, dated March 18, 2022</a></p> </td>
     <td style="border-bottom: 1px solid rgb(0, 0, 0); vertical-align: top; width: 25%; border-left: 1px solid rgb(0, 0, 0); border-right: 1px solid rgb(0, 0, 0);"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">Incorporated by reference to Exhibit 10.1 to the registrant's current report on Form 8-K filed on March 18, 2022</p> </td>
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     <td style="border-bottom: 1px solid rgb(0, 0, 0); vertical-align: top; width: 8%; border-left: 1px solid rgb(0, 0, 0);"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;">31.1</p> </td>
     <td style="border-bottom: 1px solid rgb(0, 0, 0); vertical-align: top; width: 67%; border-left: 1px solid rgb(0, 0, 0);"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;"><a href="ex_373517.htm" style="-sec-extract:exhibit;">Certification of Chief Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 and SEC Rule 13a-14(a)</a></p> </td>
     <td style="border-bottom: 1px solid rgb(0, 0, 0); vertical-align: top; width: 25%; border-left: 1px solid rgb(0, 0, 0); border-right: 1px solid rgb(0, 0, 0);"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">Filed herewith</p> </td>
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     <td style="border-bottom: 1px solid rgb(0, 0, 0); vertical-align: top; width: 8%; border-left: 1px solid rgb(0, 0, 0);"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;">31.2</p> </td>
     <td style="border-bottom: 1px solid rgb(0, 0, 0); vertical-align: top; width: 67%; border-left: 1px solid rgb(0, 0, 0);"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;"><a href="ex_373518.htm" style="-sec-extract:exhibit;">Certification of principal financial officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 and SEC Rule 13a-14(a)</a></p> </td>
     <td style="border-bottom: 1px solid rgb(0, 0, 0); vertical-align: top; width: 25%; border-left: 1px solid rgb(0, 0, 0); border-right: 1px solid rgb(0, 0, 0);"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">Filed herewith</p> </td>
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     <td style="border-bottom: 1px solid rgb(0, 0, 0); vertical-align: top; width: 8%; border-left: 1px solid rgb(0, 0, 0);"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;">32.1</p> </td>
     <td style="border-bottom: 1px solid rgb(0, 0, 0); vertical-align: top; width: 67%; border-left: 1px solid rgb(0, 0, 0);"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;"><a href="ex_373519.htm" style="-sec-extract:exhibit;">Certification of Chief Executive Officer Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002</a></p> </td>
     <td style="border-bottom: 1px solid rgb(0, 0, 0); vertical-align: top; width: 25%; border-left: 1px solid rgb(0, 0, 0); border-right: 1px solid rgb(0, 0, 0);"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">Furnished herewith</p> </td>
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     <td style="border-bottom: 1px solid rgb(0, 0, 0); vertical-align: top; width: 8%; border-left: 1px solid rgb(0, 0, 0);"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;">32.2</p> </td>
     <td style="border-bottom: 1px solid rgb(0, 0, 0); vertical-align: top; width: 67%; border-left: 1px solid rgb(0, 0, 0);"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;"><a href="ex_373520.htm" style="-sec-extract:exhibit;">Certification of principal financial officer Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002</a></p> </td>
     <td style="border-bottom: 1px solid rgb(0, 0, 0); vertical-align: top; width: 25%; border-left: 1px solid rgb(0, 0, 0); border-right: 1px solid rgb(0, 0, 0);"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">Furnished herewith</p> </td>
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     <td style="border-bottom: 1px solid rgb(0, 0, 0); vertical-align: top; width: 8%; border-left: 1px solid rgb(0, 0, 0);"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;">101</p> </td>
     <td style="border-bottom: 1px solid rgb(0, 0, 0); vertical-align: top; width: 67%; border-left: 1px solid rgb(0, 0, 0);"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">The following materials from Diffusion&#x2019;s quarterly report on Form 10-Q for the quarter ended March 31, 2022, formatted in Inline XBRL (Extensible Business Reporting Language): (i) the Unaudited Consolidated Balance Sheets, (ii) the Unaudited Consolidated Statements of Operations, (iii) the Unaudited Consolidated Statement of Changes in Stockholders&#x2019;&#xa0;Equity, (iv) the Unaudited Consolidated Statements of Cash Flows, and (v) Notes to Unaudited Consolidated Financial Statements</p> </td>
     <td style="border-bottom: 1px solid rgb(0, 0, 0); vertical-align: top; width: 25%; border-left: 1px solid rgb(0, 0, 0); border-right: 1px solid rgb(0, 0, 0);"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">Filed herewith</p> </td>
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     <td style="border-bottom: 1px solid rgb(0, 0, 0); vertical-align: top; width: 8%; border-left: 1px solid rgb(0, 0, 0); text-align: center;">104</td>
     <td style="border-bottom: 1px solid rgb(0, 0, 0); vertical-align: top; width: 67%; border-left: 1px solid rgb(0, 0, 0);">Cover Page Interactive Data File (formatted as Inline XBRL and contained in Exhibit 101).</td>
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  <p style="font-family: 'Times New Roman', Times, serif; font-size: 10pt; margin: 0pt; text-align: left">&#xa0;</p>
  <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;text-indent:9pt;"><b>SIGNATURES</b></p>
  <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
  <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;text-indent:45pt;">Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.</p>
  <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
  <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;text-indent:9pt;">Date: May 12, 2022</p>
  <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#xa0;</p>
  <table border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt; font-family: &quot;Times New Roman&quot;, Times, serif; width: 100%;">
   <tbody>
    <tr>
     <td style="width: 50%;">&#xa0;</td>
     <td style="width: 5%;">&#xa0;</td>
     <td style="width: 33%;"><b>DIFFUSION PHARMACEUTICALS INC.</b></td>
     <td style="width: 12%;">&#xa0;</td>
    </tr>

    <tr>
     <td style="width: 50%;">&#xa0;</td>
     <td style="width: 5%;">&#xa0;</td>
     <td style="width: 33%;">&#xa0;</td>
     <td style="width: 12%;">&#xa0;</td>
    </tr>

    <tr>
     <td style="width: 50%;">&#xa0;</td>
     <td style="width: 5%;">&#xa0;</td>
     <td style="width: 33%;">&#xa0;</td>
     <td style="width: 12%;">&#xa0;</td>
    </tr>

    <tr>
     <td style="width: 50%;">&#xa0;</td>
     <td style="width: 5%;">&#xa0;</td>
     <td style="width: 33%;">&#xa0;</td>
     <td style="width: 12%;">&#xa0;</td>
    </tr>

    <tr>
     <td style="width: 50%;">&#xa0;</td>
     <td style="width: 5%;">By:</td>
     <td style="width: 33%; border-bottom: 1px solid rgb(0, 0, 0);">/s/ Robert J. Cobuzzi, Jr., Ph.D.</td>
     <td style="width: 12%;">&#xa0;</td>
    </tr>

    <tr>
     <td style="width: 50%;">&#xa0;</td>
     <td style="width: 5%;">&#xa0;</td>
     <td style="width: 33%;">Robert J. Cobuzzi, Jr., Ph.D.</td>
     <td style="width: 12%;">&#xa0;</td>
    </tr>

    <tr>
     <td style="width: 50%;">&#xa0;</td>
     <td style="width: 5%;">&#xa0;</td>
     <td style="width: 33%;">&#xa0;</td>
     <td style="width: 12%;">&#xa0;</td>
    </tr>

    <tr>
     <td style="width: 50%;">&#xa0;</td>
     <td style="width: 5%;">&#xa0;</td>
     <td style="width: 33%;">President and Chief Executive Officer</td>
     <td style="width: 12%;">&#xa0;</td>
    </tr>

    <tr>
     <td style="width: 50%;">&#xa0;</td>
     <td style="width: 5%;">&#xa0;</td>
     <td style="width: 33%;">(Principal Executive Officer)</td>
     <td style="width: 12%;">&#xa0;</td>
    </tr>

    <tr>
     <td style="width: 50%;">&#xa0;</td>
     <td style="width: 5%;">&#xa0;</td>
     <td style="width: 33%;">&#xa0;</td>
     <td style="width: 12%;">&#xa0;</td>
    </tr>

    <tr>
     <td style="width: 50%;">&#xa0;</td>
     <td style="width: 5%;">&#xa0;</td>
     <td style="width: 33%;">&#xa0;</td>
     <td style="width: 12%;">&#xa0;</td>
    </tr>

    <tr>
     <td style="width: 50%;">&#xa0;</td>
     <td style="width: 5%;">By:</td>
     <td style="width: 33%; border-bottom: 1px solid rgb(0, 0, 0);">/s/ William Hornung</td>
     <td style="width: 12%;">&#xa0;</td>
    </tr>

    <tr>
     <td style="width: 50%;">&#xa0;</td>
     <td style="width: 5%;">&#xa0;</td>
     <td style="width: 33%;">William Hornung</td>
     <td style="width: 12%;">&#xa0;</td>
    </tr>

    <tr>
     <td style="width: 50%;">&#xa0;</td>
     <td style="width: 5%;">&#xa0;</td>
     <td style="width: 33%;">Chief Financial Officer</td>
     <td style="width: 12%;">&#xa0;</td>
    </tr>

    <tr>
     <td style="width: 50%;">&#xa0;</td>
     <td style="width: 5%;">&#xa0;</td>
     <td style="width: 33%;">(Principal Financial and Accounting Officer)</td>
     <td style="width: 12%;">&#xa0;</td>
    </tr>

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<DOCUMENT>
<TYPE>EX-31.1
<SEQUENCE>2
<FILENAME>ex_373517.htm
<DESCRIPTION>EXHIBIT 31.1
<TEXT>
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<p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:right;margin:0pt;"><b>Exhibit 31.1</b></p>

<p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&nbsp;</p>

<p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b>CERTIFICATION OF PRINCIPAL EXECUTIVE OFFICER PURSUANT TO SECTION 302 OF THE</b><br>
<b>SARBANES OXLEY ACT OF 2002 AND SEC RULE 13a-14(a)</b></p>

<p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&nbsp;</p>

<p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">I, Robert J. Cobuzzi, Jr., Ph.D., certify that:</p>

<p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&nbsp;</p>

<p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt 0pt 0pt 36pt;">1.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;I have reviewed this quarterly report on Form 10-Q of Diffusion Pharmaceuticals Inc.;</p>

<p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&nbsp;</p>

<p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt 0pt 0pt 36pt;">2.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;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;</p>

<p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&nbsp;</p>

<p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt 0pt 0pt 36pt;">3.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;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;</p>

<p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&nbsp;</p>

<p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt 0pt 0pt 36pt;">4.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The registrant&#8217;s other certifying officer(s) 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:</p>

<p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&nbsp;</p>

<p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt 0pt 0pt 72pt;">(a)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;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;</p>

<p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&nbsp;</p>

<p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt 0pt 0pt 72pt;">(b)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;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;</p>

<p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&nbsp;</p>

<p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt 0pt 0pt 72pt;">(c)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Evaluated the effectiveness of the registrant&#8217;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</p>

<p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&nbsp;</p>

<p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt 0pt 0pt 72pt;">(d)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Disclosed in this report any change in the registrant&#8217;s internal control over financial reporting that occurred during the registrant&#8217;s most recent fiscal quarter (the registrant&#8217;s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant&#8217;s internal control over financial reporting; and</p>

<p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&nbsp;</p>

<p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt 0pt 0pt 36pt;">5.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The registrant&#8217;s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant&#8217;s auditors and the audit committee of the registrant&#8217;s board of directors (or persons performing the equivalent functions):</p>

<p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&nbsp;</p>

<p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt 0pt 0pt 72pt;">(a)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;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&#8217;s ability to record, process, summarize and report financial information; and</p>

<p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&nbsp;</p>

<p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt 0pt 0pt 72pt;">(b)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant&#8217;s internal control over financial reporting.</p>

<p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&nbsp;</p>

<table cellpadding="0pt" cellspacing="0pt" style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 10pt; width: 100%; margin-left: 0pt; margin-right: 0pt;">

		<tr style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 10pt;">
			<td style="vertical-align: bottom; width: 4%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 10pt;">
			<p style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 10pt; font-variant: normal; margin: 0pt;">Date:</p>
			</td>
			<td style="vertical-align: bottom; width: 46%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 10pt;">
			<p style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 10pt; font-variant: normal; margin: 0pt;">May 12, 2022</p>
			</td>
			<td style="border-bottom: 1px solid rgb(0, 0, 0); vertical-align: bottom; width: 50%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 10pt;">
			<p style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 10pt; font-variant: normal; margin: 0pt;">/s/ Robert J. Cobuzzi, Jr., Ph.D.</p>
			</td>
		</tr>
		<tr style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 10pt;">
			<td style="vertical-align: bottom; width: 4%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 10pt;">&nbsp;</td>
			<td style="vertical-align: bottom; width: 46%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 10pt;">&nbsp;</td>
			<td style="vertical-align: bottom; width: 50%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 10pt;">
			<p style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 10pt; font-variant: normal; margin: 0pt;">Robert J. Cobuzzi, Jr., Ph.D.</p>
			</td>
		</tr>
		<tr style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 10pt;">
			<td style="vertical-align: bottom; width: 4%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 10pt;">&nbsp;</td>
			<td style="vertical-align: bottom; width: 46%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 10pt;">&nbsp;</td>
			<td style="vertical-align: bottom; width: 50%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 10pt;">
			<p style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 10pt; font-variant: normal; margin: 0pt;">President and Chief Executive Officer</p>
			</td>
		</tr>
		<tr style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 10pt;">
			<td style="vertical-align: bottom; width: 4%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 10pt;">&nbsp;</td>
			<td style="vertical-align: bottom; width: 46%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 10pt;">&nbsp;</td>
			<td style="vertical-align: bottom; width: 50%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 10pt;">
			<p style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 10pt; font-variant: normal; margin: 0pt;">(Principal Executive Officer)</p>
			</td>
		</tr>

</table>

<p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&nbsp;</p>

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</DOCUMENT>
<DOCUMENT>
<TYPE>EX-31.2
<SEQUENCE>3
<FILENAME>ex_373518.htm
<DESCRIPTION>EXHIBIT 31.2
<TEXT>
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<p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:right;margin:0pt;"><b>Exhibit 31.2</b></p>

<p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&nbsp;</p>

<p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b>CERTIFICATION OF PRINCIPAL FINANCIAL OFFICER PURSUANT TO SECTION 302 OF THE</b><br>
<b>SARBANES OXLEY ACT OF 2002 AND SEC RULE 13a-14(a)</b></p>

<p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&nbsp;</p>

<p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">I, William K. Hornung, certify that:</p>

<p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&nbsp;</p>

<p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt 0pt 0pt 36pt;">1.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;I have reviewed this quarterly report on Form 10-Q of Diffusion Pharmaceuticals Inc.;</p>

<p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&nbsp;</p>

<p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt 0pt 0pt 36pt;">2.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;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;</p>

<p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&nbsp;</p>

<p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt 0pt 0pt 36pt;">3.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;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;</p>

<p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&nbsp;</p>

<p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt 0pt 0pt 36pt;">4.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The registrant&#8217;s other certifying officer(s) 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:</p>

<p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&nbsp;</p>

<p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt 0pt 0pt 72pt;">(a)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;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;</p>

<p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&nbsp;</p>

<p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt 0pt 0pt 72pt;">(b)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;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;</p>

<p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&nbsp;</p>

<p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt 0pt 0pt 72pt;">(c)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Evaluated the effectiveness of the registrant&#8217;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</p>

<p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&nbsp;</p>

<p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt 0pt 0pt 72pt;">(d)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Disclosed in this report any change in the registrant&#8217;s internal control over financial reporting that occurred during the registrant&#8217;s most recent fiscal quarter (the registrant&#8217;s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant&#8217;s internal control over financial reporting; and</p>

<p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&nbsp;</p>

<p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt 0pt 0pt 36pt;">5.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The registrant&#8217;s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant&#8217;s auditors and the audit committee of the registrant&#8217;s board of directors (or persons performing the equivalent functions):</p>

<p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&nbsp;</p>

<p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt 0pt 0pt 72pt;">(a)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;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&#8217;s ability to record, process, summarize and report financial information; and</p>

<p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&nbsp;</p>

<p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt 0pt 0pt 72pt;">(b)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant&#8217;s internal control over financial reporting.</p>

<p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&nbsp;</p>

<table border="0" cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;width:100%;margin-left:auto;margin-right:auto;">

		<tr>
			<td style="vertical-align: bottom; width: 4%;">
			<p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">Date:</p>
			</td>
			<td style="vertical-align: bottom; width: 46%;">
			<p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">May 12, 2022</p>
			</td>
			<td style="border-bottom: 1px solid rgb(0, 0, 0); vertical-align: bottom; width: 50%;">
			<p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">/s/ William K. Hornung&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</p>
			</td>
		</tr>
		<tr>
			<td style="vertical-align: bottom; width: 4%;">&nbsp;</td>
			<td style="vertical-align: bottom; width: 46%;">&nbsp;</td>
			<td style="vertical-align: bottom; width: 50%;">
			<p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">William K. Hornung</p>
			</td>
		</tr>
		<tr>
			<td style="vertical-align: bottom; width: 4%;">&nbsp;</td>
			<td style="vertical-align: bottom; width: 46%;">&nbsp;</td>
			<td style="vertical-align: bottom; width: 50%;">
			<p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">Chief Financial Officer</p>
			</td>
		</tr>
		<tr>
			<td style="vertical-align: bottom; width: 4%;">&nbsp;</td>
			<td style="vertical-align: bottom; width: 46%;">&nbsp;</td>
			<td style="vertical-align: bottom; width: 50%;">
			<p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">(Principal Financial and Accounting Officer)</p>
			</td>
		</tr>

</table>

<p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&nbsp;</p>

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<DOCUMENT>
<TYPE>EX-32.1
<SEQUENCE>4
<FILENAME>ex_373519.htm
<DESCRIPTION>EXHIBIT 32.1
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<p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:right;margin:0pt;"><b>Exhibit 32.1</b></p>

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<p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b>CERTIFICATION OF PRINCIPAL EXECUTIVE OFFICER PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002</b></p>

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<p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">In connection with the Quarterly Report on Form 10-Q of Diffusion Pharmaceuticals Inc. (the &#8220;Company&#8221;) for the quarter ended March 31, 2022 as filed with the Securities and Exchange Commission on the date hereof (the &#8220;Report&#8221;), I, Robert J. Cobuzzi, Jr., Ph.D, President and Chief Executive Officer of the Company, certify, pursuant to 18 U.S.C. &#167; 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that to my knowledge:</p>

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			<p style="font-family: Times New Roman;font-size: 10pt;font-variant:normal;margin:0pt;">(1)</p>
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			<p style="font-family: Times New Roman;font-size: 10pt;font-variant:normal;margin:0pt;">The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and</p>
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			<p style="font-family: Times New Roman;font-size: 10pt;font-variant:normal;margin:0pt;">(2)</p>
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			<p style="font-family: Times New Roman;font-size: 10pt;font-variant:normal;margin:0pt;">The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.</p>
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			<td style="vertical-align: bottom; width: 50%;">&nbsp;</td>
			<td style="border-bottom: 1px solid rgb(0, 0, 0); vertical-align: bottom; width: 50%;">
			<p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">/s/ Robert J. Cobuzzi, Jr., Ph.D</p>
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			<td style="vertical-align: bottom; width: 50%;">&nbsp;</td>
			<td style="vertical-align: bottom; width: 50%;">
			<p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">Robert J. Cobuzzi, Jr., Ph.D</p>
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			<td style="vertical-align: bottom; width: 50%;">&nbsp;</td>
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			<p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">President and Chief Executive Officer</p>
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			<td style="vertical-align: bottom; width: 50%;">&nbsp;</td>
			<td style="vertical-align: bottom; width: 50%;">
			<p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">May 12, 2022</p>
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<DOCUMENT>
<TYPE>EX-32.2
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<DESCRIPTION>EXHIBIT 32.2
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<p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:right;margin:0pt;"><b>Exhibit 32.2</b></p>

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<p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b>CERTIFICATION OF PRINCIPAL FINANCIAL OFFICER PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002</b></p>

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<p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">In connection with the Quarterly Report on Form 10-Q of Diffusion Pharmaceuticals Inc. (the &#8220;Company&#8221;) for the quarter ended March 31, 2022 as filed with the Securities and Exchange Commission on the date hereof (the &#8220;Report&#8221;), I, William K. Hornung, Chief Financial Officer of the Company, certify, pursuant to 18 U.S.C. &#167; 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that to my knowledge:</p>

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			<p style="font-family: Times New Roman;font-size: 10pt;font-variant:normal;margin:0pt;">(1)</p>
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			<td style="width: auto;">
			<p style="font-family: Times New Roman;font-size: 10pt;font-variant:normal;margin:0pt;">The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and</p>
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			<p style="font-family: Times New Roman;font-size: 10pt;font-variant:normal;margin:0pt;">(2)</p>
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			<p style="font-family: Times New Roman;font-size: 10pt;font-variant:normal;margin:0pt;">The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.</p>
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			<p style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 10pt; font-variant: normal; margin: 0pt;">/s/ William K. Hornung</p>
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			<td style="vertical-align: bottom; width: 50%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 10pt;">
			<p style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 10pt; font-variant: normal; margin: 0pt;">William K. Hornung</p>
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			<p style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 10pt; font-variant: normal; margin: 0pt;">Chief Financial Officer (Principal Financial and Accounting Officer)</p>
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			<td style="vertical-align: bottom; width: 50%; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 10pt;">
			<p style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 10pt; font-variant: normal; margin: 0pt;">May 12, 2022</p>
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    <link:label xlink:label="dffn_statement-statement-note-4-cash-cash-equivalents-and-marketable-securities-tables-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Note 4 - Cash, Cash Equivalents and Marketable Securities</link:label>
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    <link:label xlink:label="dffn_statement-statement-note-5-fair-value-of-financial-instruments-tables-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Note 5 - Fair Value of Financial Instruments</link:label>
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    <link:label xlink:label="dffn_statement-statement-note-6-accrued-expenses-and-other-current-liabilities-tables-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Note 6 - Accrued Expenses and Other Current Liabilities</link:label>
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    <link:label xlink:label="dffn_statement-statement-note-8-stockbased-compensation-tables-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Note 8 - Stock-based Compensation</link:label>
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    <link:label xlink:label="dffn_statement-statement-note-3-basis-of-presentation-and-summary-of-significant-accounting-policies-outstanding-dilutive-securities-details-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Note 3 - Basis of Presentation and Summary of Significant Accounting Policies - Outstanding Dilutive Securities (Details)</link:label>
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    <link:label xlink:label="dffn_statement-statement-note-4-cash-cash-equivalents-and-marketable-securities-cash-and-cah-equivalents-details-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Note 4 - Cash, Cash Equivalents and Marketable Securities - Cash and Cah Equivalents (Details)</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dffn_NotesToFinancialStatements" xlink:to="dffn_NotesToFinancialStatements-label" xlink:type="arc"/>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_EarningsPerSharePolicyTextBlock" xlink:to="us-gaap_EarningsPerSharePolicyTextBlock-label" xlink:type="arc"/>
    <link:loc xlink:href="dffn-20220331.xsd#dffn_NotesToFinancialStatementsAbstract" xlink:label="dffn_NotesToFinancialStatementsAbstract" xlink:type="locator"/>
    <link:label xlink:label="dffn_NotesToFinancialStatementsAbstract-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Notes To Financial Statements [Abstract]</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dffn_NotesToFinancialStatementsAbstract" xlink:to="dffn_NotesToFinancialStatementsAbstract-label" xlink:type="arc"/>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock" xlink:to="us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock-label" xlink:type="arc"/>
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    <link:label xlink:label="us-gaap_OperatingExpensesAbstract-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating expenses:</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OperatingExpensesAbstract" xlink:to="us-gaap_OperatingExpensesAbstract-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AssetsFairValueDisclosure" xlink:label="us-gaap_AssetsFairValueDisclosure" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_AssetsFairValueDisclosure-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">us-gaap_AssetsFairValueDisclosure</link:label>
    <link:label xlink:label="us-gaap_AssetsFairValueDisclosure-label" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total financial assets</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AssetsFairValueDisclosure" xlink:to="us-gaap_AssetsFairValueDisclosure-label" xlink:type="arc"/>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock" xlink:to="us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue" xlink:type="locator"/>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfShareBasedCompensationRestrictedStockUnitsAwardActivityTableTextBlock" xlink:label="us-gaap_ScheduleOfShareBasedCompensationRestrictedStockUnitsAwardActivityTableTextBlock" xlink:type="locator"/>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ScheduleOfShareBasedCompensationRestrictedStockUnitsAwardActivityTableTextBlock" xlink:to="us-gaap_ScheduleOfShareBasedCompensationRestrictedStockUnitsAwardActivityTableTextBlock-label" xlink:type="arc"/>
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    <link:label xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue-label" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US">Unvested, Weighted-average grant date fair value (in dollars per share)</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue-label" xlink:type="arc"/>
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    <link:label xlink:label="us-gaap_USTreasurySecuritiesMember-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">US Treasury Securities [Member]</link:label>
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    <link:label xlink:label="us-gaap_StockholdersEquityNoteStockSplitConversionRatio1-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">us-gaap_StockholdersEquityNoteStockSplitConversionRatio1</link:label>
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    <link:label xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Vested and expected to vest (in shares)</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConversionOfStockByUniqueDescriptionAxis" xlink:label="us-gaap_ConversionOfStockByUniqueDescriptionAxis" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_ConversionOfStockByUniqueDescriptionAxis-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Stock Conversion Description [Axis]</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ConversionOfStockByUniqueDescriptionAxis" xlink:to="us-gaap_ConversionOfStockByUniqueDescriptionAxis-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Vested and expected to vest, weighted-average exercise price (in dollars per share)</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConversionOfStockNameDomain" xlink:label="us-gaap_ConversionOfStockNameDomain" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_ConversionOfStockNameDomain-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Conversion of Stock, Name [Domain]</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ConversionOfStockNameDomain" xlink:to="us-gaap_ConversionOfStockNameDomain-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Vested and expected to vest, aggregate intrinsic value</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice</link:label>
    <link:label xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice-label" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Exercisable, weighted-average exercise price (in dollars per share)</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AssetsCurrent" xlink:label="us-gaap_AssetsCurrent" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_AssetsCurrent-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">us-gaap_AssetsCurrent</link:label>
    <link:label xlink:label="us-gaap_AssetsCurrent-label" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total current assets</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AssetsCurrent" xlink:to="us-gaap_AssetsCurrent-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1</link:label>
    <link:label xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1-label" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Exercisable, weighted-average remaining contractual life (Year)</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1" xlink:to="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CashAndCashEquivalentsFairValueDisclosure" xlink:label="us-gaap_CashAndCashEquivalentsFairValueDisclosure" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_CashAndCashEquivalentsFairValueDisclosure-label" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Cash and cash equivalents</link:label>
    <link:label xlink:label="us-gaap_CashAndCashEquivalentsFairValueDisclosure-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">us-gaap_CashAndCashEquivalentsFairValueDisclosure</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CashAndCashEquivalentsFairValueDisclosure" xlink:to="us-gaap_CashAndCashEquivalentsFairValueDisclosure-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1</link:label>
    <link:label xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1-label" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Exercisable, aggregate intrinsic value</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1" xlink:to="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockholdersEquityNoteDisclosureTextBlock" xlink:label="us-gaap_StockholdersEquityNoteDisclosureTextBlock" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_StockholdersEquityNoteDisclosureTextBlock-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Stockholders' Equity Note Disclosure [Text Block]</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockholdersEquityNoteDisclosureTextBlock" xlink:to="us-gaap_StockholdersEquityNoteDisclosureTextBlock-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1</link:label>
    <link:label xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1-label" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested in Period, Fair Value</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1" xlink:to="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber</link:label>
    <link:label xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber-label" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Exercisable (in shares)</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2</link:label>
    <link:label xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2-label" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Options outstanding, weighted-average remaining contractual life (Year)</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2" xlink:to="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue</link:label>
    <link:label xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue-label" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Options outstanding, aggregate intrinsic value</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue</link:label>
    <link:label xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue-label" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InterestIncomeExpenseNonoperatingNet" xlink:label="us-gaap_InterestIncomeExpenseNonoperatingNet" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_InterestIncomeExpenseNonoperatingNet-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">us-gaap_InterestIncomeExpenseNonoperatingNet</link:label>
    <link:label xlink:label="us-gaap_InterestIncomeExpenseNonoperatingNet-label" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Interest income</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InterestIncomeExpenseNonoperatingNet" xlink:to="us-gaap_InterestIncomeExpenseNonoperatingNet-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonStockValue" xlink:label="us-gaap_CommonStockValue" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_CommonStockValue-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Common stock, $0.001 par value: 1,000,000,000 shares authorized; 2,038,392 and 2,038,185 shares issued and outstanding at March 31, 2022 and December 31, 2021, respectively</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CommonStockValue" xlink:to="us-gaap_CommonStockValue-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PaymentsToAcquireMarketableSecurities" xlink:label="us-gaap_PaymentsToAcquireMarketableSecurities" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_PaymentsToAcquireMarketableSecurities-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">us-gaap_PaymentsToAcquireMarketableSecurities</link:label>
    <link:label xlink:label="us-gaap_PaymentsToAcquireMarketableSecurities-label" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Purchases of marketable securities</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PaymentsToAcquireMarketableSecurities" xlink:to="us-gaap_PaymentsToAcquireMarketableSecurities-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:label="us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Financial Instruments [Domain]</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:to="us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Adjustments to reconcile net loss to net cash used in operating activities:</link:label>
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    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueByMeasurementFrequencyAxis" xlink:label="us-gaap_FairValueByMeasurementFrequencyAxis" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_FairValueByMeasurementFrequencyAxis-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Measurement Frequency [Axis]</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueByMeasurementFrequencyAxis" xlink:to="us-gaap_FairValueByMeasurementFrequencyAxis-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice</link:label>
    <link:label xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice-label" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US">Balance at January 1, 2022 (in dollars per share)</link:label>
    <link:label xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice-label" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US">Options outstanding, weighted-average exercise price (in dollars per share)</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueMeasurementFrequencyDomain" xlink:label="us-gaap_FairValueMeasurementFrequencyDomain" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_FairValueMeasurementFrequencyDomain-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Measurement Frequency [Domain]</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueMeasurementFrequencyDomain" xlink:to="us-gaap_FairValueMeasurementFrequencyDomain-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueMeasurementsRecurringMember" xlink:label="us-gaap_FairValueMeasurementsRecurringMember" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_FairValueMeasurementsRecurringMember-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value, Recurring [Member]</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueMeasurementsRecurringMember" xlink:to="us-gaap_FairValueMeasurementsRecurringMember-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonStockSharesAuthorized" xlink:label="us-gaap_CommonStockSharesAuthorized" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_CommonStockSharesAuthorized-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Common stock, shares authorized (in shares)</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CommonStockSharesAuthorized" xlink:to="us-gaap_CommonStockSharesAuthorized-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cancelled/forfeited, weighted-average exercise price (in dollars per share)</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice" xlink:to="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommercialPaperMember" xlink:label="us-gaap_CommercialPaperMember" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_CommercialPaperMember-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Commercial Paper [Member]</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CommercialPaperMember" xlink:to="us-gaap_CommercialPaperMember-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonStockSharesIssued" xlink:label="us-gaap_CommonStockSharesIssued" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_CommonStockSharesIssued-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Common stock, shares issued (in shares)</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CommonStockSharesIssued" xlink:to="us-gaap_CommonStockSharesIssued-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FinancialInstrumentAxis" xlink:label="us-gaap_FinancialInstrumentAxis" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_FinancialInstrumentAxis-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Financial Instrument [Axis]</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FinancialInstrumentAxis" xlink:to="us-gaap_FinancialInstrumentAxis-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockholdersEquityPolicyTextBlock" xlink:label="us-gaap_StockholdersEquityPolicyTextBlock" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_StockholdersEquityPolicyTextBlock-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Stockholders' Equity, Policy [Policy Text Block]</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockholdersEquityPolicyTextBlock" xlink:to="us-gaap_StockholdersEquityPolicyTextBlock-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonStockParOrStatedValuePerShare" xlink:label="us-gaap_CommonStockParOrStatedValuePerShare" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_CommonStockParOrStatedValuePerShare-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Common stock, par value (in dollars per share)</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CommonStockParOrStatedValuePerShare" xlink:to="us-gaap_CommonStockParOrStatedValuePerShare-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Granted, weighted-average exercise price (in dollars per share)</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice" xlink:to="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice-label" xlink:type="arc"/>
    <link:loc xlink:href="dffn-20220331.xsd#dffn_PrepaidExpensesDepositsAndOtherAssets" xlink:label="dffn_PrepaidExpensesDepositsAndOtherAssets" xlink:type="locator"/>
    <link:label xlink:label="dffn_PrepaidExpensesDepositsAndOtherAssets-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Prepaid expenses, deposits and other current assets</link:label>
    <link:label xlink:label="dffn_PrepaidExpensesDepositsAndOtherAssets-label" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Carrying amount as of the balance sheet date of consideration paid in advance for costs that provide economic benefits within a future period, amounts transferred third parties for security purposes that are expected to be returned or applied towards payment, and assets not separately disclosed in the balance sheet that are expected to be realized or consumed within one year or the normal operating cycle, if longer.</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dffn_PrepaidExpensesDepositsAndOtherAssets" xlink:to="dffn_PrepaidExpensesDepositsAndOtherAssets-label" xlink:type="arc"/>
    <link:loc xlink:href="dffn-20220331.xsd#dffn_TheMay2020InvestorWarrantExerciseMember" xlink:label="dffn_TheMay2020InvestorWarrantExerciseMember" xlink:type="locator"/>
    <link:label xlink:label="dffn_TheMay2020InvestorWarrantExerciseMember-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">The May 2020 Investor Warrant Exercise [Member]</link:label>
    <link:label xlink:label="dffn_TheMay2020InvestorWarrantExerciseMember-label" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Related to the May 2020 Investor Warrant Exercise.</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dffn_TheMay2020InvestorWarrantExerciseMember" xlink:to="dffn_TheMay2020InvestorWarrantExerciseMember-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember" xlink:label="srt_RangeMember" xlink:type="locator"/>
    <link:label xlink:label="srt_RangeMember-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Statistical Measurement [Domain]</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="srt_RangeMember" xlink:to="srt_RangeMember-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OperatingLeasePayments" xlink:label="us-gaap_OperatingLeasePayments" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_OperatingLeasePayments-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">us-gaap_OperatingLeasePayments</link:label>
    <link:label xlink:label="us-gaap_OperatingLeasePayments-label" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Operating Lease, Payments</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OperatingLeasePayments" xlink:to="us-gaap_OperatingLeasePayments-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MaximumMember" xlink:label="srt_MaximumMember" xlink:type="locator"/>
    <link:label xlink:label="srt_MaximumMember-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Maximum [Member]</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="srt_MaximumMember" xlink:to="srt_MaximumMember-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract" xlink:label="us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Supplemental disclosure of non-cash activities:</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract" xlink:to="us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MinimumMember" xlink:label="srt_MinimumMember" xlink:type="locator"/>
    <link:label xlink:label="srt_MinimumMember-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Minimum [Member]</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="srt_MinimumMember" xlink:to="srt_MinimumMember-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccountsPayableCurrent" xlink:label="us-gaap_AccountsPayableCurrent" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_AccountsPayableCurrent-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Accounts payable</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AccountsPayableCurrent" xlink:to="us-gaap_AccountsPayableCurrent-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber</link:label>
    <link:label xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber-label" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US">Balance at January 1, 2022 (in shares)</link:label>
    <link:label xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber-label" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US">Options outstanding, number (in shares)</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeAxis" xlink:label="srt_RangeAxis" xlink:type="locator"/>
    <link:label xlink:label="srt_RangeAxis-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Statistical Measurement [Axis]</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="srt_RangeAxis" xlink:to="srt_RangeAxis-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PreferredStockValue" xlink:label="us-gaap_PreferredStockValue" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_PreferredStockValue-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Series C convertible preferred stock, $0.001 par value: 10,000 shares authorized; 10,000 and 0 shares issued and outstanding at March 31, 2022 and December 31, 2021, respectively</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PreferredStockValue" xlink:to="us-gaap_PreferredStockValue-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherAccruedLiabilitiesCurrent" xlink:label="us-gaap_OtherAccruedLiabilitiesCurrent" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_OtherAccruedLiabilitiesCurrent-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Accrued expenses and other current liabilities</link:label>
    <link:label xlink:label="us-gaap_OtherAccruedLiabilitiesCurrent-label" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OtherAccruedLiabilitiesCurrent" xlink:to="us-gaap_OtherAccruedLiabilitiesCurrent-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PreferredStockSharesIssued" xlink:label="us-gaap_PreferredStockSharesIssued" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_PreferredStockSharesIssued-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Preferred stock, issued (in shares)</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PreferredStockSharesIssued" xlink:to="us-gaap_PreferredStockSharesIssued-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccruedSalariesCurrent" xlink:label="us-gaap_AccruedSalariesCurrent" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_AccruedSalariesCurrent-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">us-gaap_AccruedSalariesCurrent</link:label>
    <link:label xlink:label="us-gaap_AccruedSalariesCurrent-label" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Accrued payroll and payroll related expenses</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AccruedSalariesCurrent" xlink:to="us-gaap_AccruedSalariesCurrent-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PolicyTextBlockAbstract" xlink:label="us-gaap_PolicyTextBlockAbstract" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_PolicyTextBlockAbstract-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">us-gaap_PolicyTextBlockAbstract</link:label>
    <link:label xlink:label="us-gaap_PolicyTextBlockAbstract-label" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Accounting Policies</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PolicyTextBlockAbstract" xlink:to="us-gaap_PolicyTextBlockAbstract-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PreferredStockSharesAuthorized" xlink:label="us-gaap_PreferredStockSharesAuthorized" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_PreferredStockSharesAuthorized-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Preferred stock, authorized (in shares)</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PreferredStockSharesAuthorized" xlink:to="us-gaap_PreferredStockSharesAuthorized-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant</link:label>
    <link:label xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant-label" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccruedProfessionalFeesCurrent" xlink:label="us-gaap_AccruedProfessionalFeesCurrent" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_AccruedProfessionalFeesCurrent-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">us-gaap_AccruedProfessionalFeesCurrent</link:label>
    <link:label xlink:label="us-gaap_AccruedProfessionalFeesCurrent-label" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Accrued professional fees</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AccruedProfessionalFeesCurrent" xlink:to="us-gaap_AccruedProfessionalFeesCurrent-label" xlink:type="arc"/>
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    <link:label xlink:label="us-gaap_PreferredStockParOrStatedValuePerShare-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Preferred stock, par value (in dollars per share)</link:label>
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    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueInputsLevel3Member" xlink:label="us-gaap_FairValueInputsLevel3Member" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_FairValueInputsLevel3Member-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value, Inputs, Level 3 [Member]</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueInputsLevel3Member" xlink:to="us-gaap_FairValueInputsLevel3Member-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized</link:label>
    <link:label xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized-label" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized (in shares)</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized-label" xlink:type="arc"/>
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    <link:label xlink:label="us-gaap_FairValueMeasurementsFairValueHierarchyDomain-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value Hierarchy and NAV [Domain]</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:to="us-gaap_FairValueMeasurementsFairValueHierarchyDomain-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueInputsLevel1Member" xlink:label="us-gaap_FairValueInputsLevel1Member" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_FairValueInputsLevel1Member-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value, Inputs, Level 1 [Member]</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueInputsLevel1Member" xlink:to="us-gaap_FairValueInputsLevel1Member-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueInputsLevel2Member" xlink:label="us-gaap_FairValueInputsLevel2Member" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_FairValueInputsLevel2Member-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value, Inputs, Level 2 [Member]</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueInputsLevel2Member" xlink:to="us-gaap_FairValueInputsLevel2Member-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1</link:label>
    <link:label xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1-label" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Month)</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccountsPayableAccruedLiabilitiesAndOtherLiabilitiesDisclosureCurrentTextBlock" xlink:label="us-gaap_AccountsPayableAccruedLiabilitiesAndOtherLiabilitiesDisclosureCurrentTextBlock" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_AccountsPayableAccruedLiabilitiesAndOtherLiabilitiesDisclosureCurrentTextBlock-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Accounts Payable, Accrued Liabilities, and Other Liabilities Disclosure, Current [Text Block]</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AccountsPayableAccruedLiabilitiesAndOtherLiabilitiesDisclosureCurrentTextBlock" xlink:to="us-gaap_AccountsPayableAccruedLiabilitiesAndOtherLiabilitiesDisclosureCurrentTextBlock-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:label="us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_FairValueByFairValueHierarchyLevelAxis-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value Hierarchy and NAV [Axis]</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:to="us-gaap_FairValueByFairValueHierarchyLevelAxis-label" xlink:type="arc"/>
    <link:loc xlink:href="dffn-20220331.xsd#dffn_EquityIncentivePlan2015Member" xlink:label="dffn_EquityIncentivePlan2015Member" xlink:type="locator"/>
    <link:label xlink:label="dffn_EquityIncentivePlan2015Member-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Equity Incentive Plan 2015 [Member]</link:label>
    <link:label xlink:label="dffn_EquityIncentivePlan2015Member-label" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the information pertaining to the 2015 equity incentive plan.</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dffn_EquityIncentivePlan2015Member" xlink:to="dffn_EquityIncentivePlan2015Member-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LiabilitiesCurrentAbstract" xlink:label="us-gaap_LiabilitiesCurrentAbstract" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_LiabilitiesCurrentAbstract-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Current liabilities:</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LiabilitiesCurrentAbstract" xlink:to="us-gaap_LiabilitiesCurrentAbstract-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_Assets" xlink:label="us-gaap_Assets" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_Assets-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">us-gaap_Assets</link:label>
    <link:label xlink:label="us-gaap_Assets-label" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total assets</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_Assets" xlink:to="us-gaap_Assets-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PlanNameAxis" xlink:label="us-gaap_PlanNameAxis" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_PlanNameAxis-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Plan Name [Axis]</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PlanNameAxis" xlink:to="us-gaap_PlanNameAxis-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PlanNameDomain" xlink:label="us-gaap_PlanNameDomain" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_PlanNameDomain-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Plan Name [Domain]</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PlanNameDomain" xlink:to="us-gaap_PlanNameDomain-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized" xlink:label="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized</link:label>
    <link:label xlink:label="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized-label" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized" xlink:to="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating activities:</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" xlink:to="us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1" xlink:label="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1</link:label>
    <link:label xlink:label="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1-label" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1" xlink:to="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CashCashEquivalentsAndMarketableSecuritiesTextBlock" xlink:label="us-gaap_CashCashEquivalentsAndMarketableSecuritiesTextBlock" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_CashCashEquivalentsAndMarketableSecuritiesTextBlock-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash, Cash Equivalents, and Marketable Securities [Text Block]</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CashCashEquivalentsAndMarketableSecuritiesTextBlock" xlink:to="us-gaap_CashCashEquivalentsAndMarketableSecuritiesTextBlock-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementLineItems" xlink:label="us-gaap_StatementLineItems" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_StatementLineItems-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" 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_StatementLineItems" xlink:to="us-gaap_StatementLineItems-label" xlink:type="arc"/>
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    <link:label xlink:label="us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-Based Payment Arrangement [Text Block]</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock" xlink:to="us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock-label" xlink:type="arc"/>
    <link:loc xlink:href="dffn-20220331.xsd#dffn_WarrantsIssuedInConnectionWithMay2019PublicOfferingMember" xlink:label="dffn_WarrantsIssuedInConnectionWithMay2019PublicOfferingMember" xlink:type="locator"/>
    <link:label xlink:label="dffn_WarrantsIssuedInConnectionWithMay2019PublicOfferingMember-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Warrants Issued in Connection with May 2019 Public Offering [Member]</link:label>
    <link:label xlink:label="dffn_WarrantsIssuedInConnectionWithMay2019PublicOfferingMember-label" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Information pertaining to warrants issued in connection with May 2019 public offering.</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dffn_WarrantsIssuedInConnectionWithMay2019PublicOfferingMember" xlink:to="dffn_WarrantsIssuedInConnectionWithMay2019PublicOfferingMember-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MarketableSecuritiesCurrent" xlink:label="us-gaap_MarketableSecuritiesCurrent" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_MarketableSecuritiesCurrent-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Marketable securities</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_MarketableSecuritiesCurrent" xlink:to="us-gaap_MarketableSecuritiesCurrent-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock" xlink:label="us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock" xlink:to="us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AdditionalPaidInCapitalCommonStock" xlink:label="us-gaap_AdditionalPaidInCapitalCommonStock" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_AdditionalPaidInCapitalCommonStock-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Additional paid-in capital</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AdditionalPaidInCapitalCommonStock" xlink:to="us-gaap_AdditionalPaidInCapitalCommonStock-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember" xlink:label="us-gaap_AccumulatedOtherComprehensiveIncomeMember" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_AccumulatedOtherComprehensiveIncomeMember-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">AOCI Attributable to Parent [Member]</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AccumulatedOtherComprehensiveIncomeMember" xlink:to="us-gaap_AccumulatedOtherComprehensiveIncomeMember-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Award Type [Domain]</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:to="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AssetsCurrentAbstract" xlink:label="us-gaap_AssetsCurrentAbstract" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_AssetsCurrentAbstract-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Current assets:</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AssetsCurrentAbstract" xlink:to="us-gaap_AssetsCurrentAbstract-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SaleOfStockPricePerShare" xlink:label="us-gaap_SaleOfStockPricePerShare" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_SaleOfStockPricePerShare-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">us-gaap_SaleOfStockPricePerShare</link:label>
    <link:label xlink:label="us-gaap_SaleOfStockPricePerShare-label" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Sale of Stock, Price Per Share (in dollars per share)</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SaleOfStockPricePerShare" xlink:to="us-gaap_SaleOfStockPricePerShare-label" xlink:type="arc"/>
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    <link:label xlink:label="us-gaap_FairValueDisclosuresTextBlock-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value Disclosures [Text Block]</link:label>
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    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AwardTypeAxis" xlink:label="us-gaap_AwardTypeAxis" xlink:type="locator"/>
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    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations</link:label>
    <link:label xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations-label" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US">Cash and cash equivalents at beginning of year</link:label>
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    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InvestmentIncomeNetAmortizationOfDiscountAndPremium" xlink:label="us-gaap_InvestmentIncomeNetAmortizationOfDiscountAndPremium" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_InvestmentIncomeNetAmortizationOfDiscountAndPremium-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">us-gaap_InvestmentIncomeNetAmortizationOfDiscountAndPremium</link:label>
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    <link:label xlink:label="us-gaap_NetCashProvidedByUsedInFinancingActivities-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">us-gaap_NetCashProvidedByUsedInFinancingActivities</link:label>
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    <link:loc xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_DirectorMember" xlink:label="srt_DirectorMember" xlink:type="locator"/>
    <link:label xlink:label="srt_DirectorMember-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Director [Member]</link:label>
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    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OperatingIncomeLoss" xlink:label="us-gaap_OperatingIncomeLoss" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_OperatingIncomeLoss-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">us-gaap_OperatingIncomeLoss</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OperatingIncomeLoss" xlink:to="us-gaap_OperatingIncomeLoss-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EmployeeStockOptionMember" xlink:label="us-gaap_EmployeeStockOptionMember" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_EmployeeStockOptionMember-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-Based Payment Arrangement, Option [Member]</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_EmployeeStockOptionMember" xlink:to="us-gaap_EmployeeStockOptionMember-label" xlink:type="arc"/>
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    <link:label xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivities-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">us-gaap_NetCashProvidedByUsedInOperatingActivities</link:label>
    <link:label xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivities-label" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net cash used in operating activities</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:to="us-gaap_NetCashProvidedByUsedInOperatingActivities-label" xlink:type="arc"/>
    <link:loc xlink:href="dffn-20220331.xsd#dffn_MarketableSecuritiesOtherthantemporaryImpairmentLoss" xlink:label="dffn_MarketableSecuritiesOtherthantemporaryImpairmentLoss" xlink:type="locator"/>
    <link:label xlink:label="dffn_MarketableSecuritiesOtherthantemporaryImpairmentLoss-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">dffn_MarketableSecuritiesOtherthantemporaryImpairmentLoss</link:label>
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    <link:label xlink:label="dffn_MarketableSecuritiesOtherthantemporaryImpairmentLoss-label" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The amount of other-than-temporary impairment loss on marketable securities.</link:label>
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    <link:label xlink:label="us-gaap_NetCashProvidedByUsedInInvestingActivities-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">us-gaap_NetCashProvidedByUsedInInvestingActivities</link:label>
    <link:label xlink:label="us-gaap_NetCashProvidedByUsedInInvestingActivities-label" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net cash used in investing activities</link:label>
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    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_WarrantMember" xlink:label="us-gaap_WarrantMember" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_WarrantMember-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Warrant [Member]</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_WarrantMember" xlink:to="us-gaap_WarrantMember-label" xlink:type="arc"/>
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    <link:label xlink:label="us-gaap_AntidilutiveSecuritiesNameDomain-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Antidilutive Securities, Name [Domain]</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AntidilutiveSecuritiesNameDomain" xlink:to="us-gaap_AntidilutiveSecuritiesNameDomain-label" xlink:type="arc"/>
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    <link:label xlink:label="us-gaap_BankTimeDepositsMember-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Bank Time Deposits [Member]</link:label>
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    <link:label xlink:label="us-gaap_ConcentrationRiskCreditRisk-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Concentration Risk, Credit Risk, Policy [Policy Text Block]</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ConcentrationRiskCreditRisk" xlink:to="us-gaap_ConcentrationRiskCreditRisk-label" xlink:type="arc"/>
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    <link:label xlink:label="us-gaap_OtherSundryLiabilitiesCurrent-label" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OtherSundryLiabilitiesCurrent" xlink:to="us-gaap_OtherSundryLiabilitiesCurrent-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_PresidentMember" xlink:label="srt_PresidentMember" xlink:type="locator"/>
    <link:label xlink:label="srt_PresidentMember-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">President [Member]</link:label>
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    <link:loc xlink:href="dffn-20220331.xsd#dffn_PercentageOfTotalSharesEligibleForPlanReserveOnAnAnnualBasis" xlink:label="dffn_PercentageOfTotalSharesEligibleForPlanReserveOnAnAnnualBasis" xlink:type="locator"/>
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    <link:label xlink:label="dffn_PercentageOfTotalSharesEligibleForPlanReserveOnAnAnnualBasis-label" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The percentage of total shares within the plan that may be added to the plan reserve, occurring on an annual basis.</link:label>
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    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash flows used in investing activities:</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:to="us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AvailableForSaleSecuritiesDebtSecurities" xlink:label="us-gaap_AvailableForSaleSecuritiesDebtSecurities" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_AvailableForSaleSecuritiesDebtSecurities-label" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Fair Value</link:label>
    <link:label xlink:label="us-gaap_AvailableForSaleSecuritiesDebtSecurities-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">us-gaap_AvailableForSaleSecuritiesDebtSecurities</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AvailableForSaleSecuritiesDebtSecurities" xlink:to="us-gaap_AvailableForSaleSecuritiesDebtSecurities-label" xlink:type="arc"/>
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    <link:label xlink:label="us-gaap_ProceedsFromWarrantExercises-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Proceeds received from the exercise of common stock warrants</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ProceedsFromWarrantExercises" xlink:to="us-gaap_ProceedsFromWarrantExercises-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ProceedsFromIssuanceOfConvertiblePreferredStock" xlink:label="us-gaap_ProceedsFromIssuanceOfConvertiblePreferredStock" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_ProceedsFromIssuanceOfConvertiblePreferredStock-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">us-gaap_ProceedsFromIssuanceOfConvertiblePreferredStock</link:label>
    <link:label xlink:label="us-gaap_ProceedsFromIssuanceOfConvertiblePreferredStock-label" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Proceeds from Issuance of Convertible Preferred Stock</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ProceedsFromIssuanceOfConvertiblePreferredStock" xlink:to="us-gaap_ProceedsFromIssuanceOfConvertiblePreferredStock-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EarningsPerShareAbstract" xlink:label="us-gaap_EarningsPerShareAbstract" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_EarningsPerShareAbstract-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Per share information:</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_EarningsPerShareAbstract" xlink:to="us-gaap_EarningsPerShareAbstract-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RetainedEarningsMember" xlink:label="us-gaap_RetainedEarningsMember" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_RetainedEarningsMember-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Retained Earnings [Member]</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RetainedEarningsMember" xlink:to="us-gaap_RetainedEarningsMember-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_TitleOfIndividualWithRelationshipToEntityDomain" xlink:label="srt_TitleOfIndividualWithRelationshipToEntityDomain" xlink:type="locator"/>
    <link:label xlink:label="srt_TitleOfIndividualWithRelationshipToEntityDomain-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Title of Individual [Domain]</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="srt_TitleOfIndividualWithRelationshipToEntityDomain" xlink:to="srt_TitleOfIndividualWithRelationshipToEntityDomain-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ProceedsFromIssuanceOfCommonStock" xlink:label="us-gaap_ProceedsFromIssuanceOfCommonStock" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_ProceedsFromIssuanceOfCommonStock-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Proceeds from the sale of common stock, net of issuance costs</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ProceedsFromIssuanceOfCommonStock" xlink:to="us-gaap_ProceedsFromIssuanceOfCommonStock-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_TitleOfIndividualAxis" xlink:label="srt_TitleOfIndividualAxis" xlink:type="locator"/>
    <link:label xlink:label="srt_TitleOfIndividualAxis-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Title of Individual [Axis]</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="srt_TitleOfIndividualAxis" xlink:to="srt_TitleOfIndividualAxis-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock" xlink:label="us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Proceeds from the sale of series C preferred stock to related parties</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock" xlink:to="us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities" xlink:label="us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Accounts payable, accrued expenses and other liabilities</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities" xlink:to="us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MarketableSecuritiesUnrealizedGainLoss" xlink:label="us-gaap_MarketableSecuritiesUnrealizedGainLoss" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_MarketableSecuritiesUnrealizedGainLoss-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">us-gaap_MarketableSecuritiesUnrealizedGainLoss</link:label>
    <link:label xlink:label="us-gaap_MarketableSecuritiesUnrealizedGainLoss-label" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Unrealized loss on marketable securities</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_MarketableSecuritiesUnrealizedGainLoss" xlink:to="us-gaap_MarketableSecuritiesUnrealizedGainLoss-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AdditionalPaidInCapitalMember" xlink:label="us-gaap_AdditionalPaidInCapitalMember" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_AdditionalPaidInCapitalMember-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Additional Paid-in Capital [Member]</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AdditionalPaidInCapitalMember" xlink:to="us-gaap_AdditionalPaidInCapitalMember-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonStockMember" xlink:label="us-gaap_CommonStockMember" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_CommonStockMember-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Common Stock [Member]</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CommonStockMember" xlink:to="us-gaap_CommonStockMember-label" xlink:type="arc"/>
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    <link:label xlink:label="us-gaap_PreferredStockMember-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Preferred Stock [Member]</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PreferredStockMember" xlink:to="us-gaap_PreferredStockMember-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="us-gaap_StatementEquityComponentsAxis" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_StatementEquityComponentsAxis-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Equity Components [Axis]</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StatementEquityComponentsAxis" xlink:to="us-gaap_StatementEquityComponentsAxis-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityComponentDomain" xlink:label="us-gaap_EquityComponentDomain" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_EquityComponentDomain-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Equity Component [Domain]</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_EquityComponentDomain" xlink:to="us-gaap_EquityComponentDomain-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MarketableSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairments" xlink:label="us-gaap_MarketableSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairments" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_MarketableSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairments-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">us-gaap_MarketableSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairments</link:label>
    <link:label xlink:label="us-gaap_MarketableSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairments-label" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Marketable Securities, Realized Gain (Loss), Excluding Other-than-temporary Impairment Loss</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_MarketableSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairments" xlink:to="us-gaap_MarketableSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairments-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1" xlink:label="us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Range of exercise price (in dollars per share)</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1" xlink:to="us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1-label" xlink:type="arc"/>
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    <link:label xlink:label="us-gaap_ClassOfWarrantOrRightAxis-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Class of Warrant or Right [Axis]</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ClassOfWarrantOrRightAxis" xlink:to="us-gaap_ClassOfWarrantOrRightAxis-label" xlink:type="arc"/>
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    <link:label xlink:label="us-gaap_ClassOfWarrantOrRightDomain-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Class of Warrant or Right [Domain]</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ClassOfWarrantOrRightDomain" xlink:to="us-gaap_ClassOfWarrantOrRightDomain-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfWarrantOrRightOutstanding" xlink:label="us-gaap_ClassOfWarrantOrRightOutstanding" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_ClassOfWarrantOrRightOutstanding-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Common stock warrants, outstanding (in shares)</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ClassOfWarrantOrRightOutstanding" xlink:to="us-gaap_ClassOfWarrantOrRightOutstanding-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount" xlink:label="us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount" xlink:to="us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount-label" xlink:type="arc"/>
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    <link:label xlink:label="us-gaap_GeneralAndAdministrativeExpense-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">General and administrative</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_GeneralAndAdministrativeExpense" xlink:to="us-gaap_GeneralAndAdministrativeExpense-label" xlink:type="arc"/>
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    <link:label xlink:label="us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent</link:label>
    <link:label xlink:label="us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent-label" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent" xlink:to="us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent" xlink:label="us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent</link:label>
    <link:label xlink:label="us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent-label" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent" xlink:to="us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent-label" xlink:type="arc"/>
    <link:loc xlink:href="dffn-20220331.xsd#dffn_AccruedClinicalStudiesExpensesCurrent" xlink:label="dffn_AccruedClinicalStudiesExpensesCurrent" xlink:type="locator"/>
    <link:label xlink:label="dffn_AccruedClinicalStudiesExpensesCurrent-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">dffn_AccruedClinicalStudiesExpensesCurrent</link:label>
    <link:label xlink:label="dffn_AccruedClinicalStudiesExpensesCurrent-label" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Accrued clinical studies expenses</link:label>
    <link:label xlink:label="dffn_AccruedClinicalStudiesExpensesCurrent-label" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Carrying value as of the balance sheet date of obligations incurred through that date and payable for clinical studies.</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dffn_AccruedClinicalStudiesExpensesCurrent" xlink:to="dffn_AccruedClinicalStudiesExpensesCurrent-label" xlink:type="arc"/>
    <link:loc xlink:href="dffn-20220331.xsd#dffn_ReverseStockSplitMember" xlink:label="dffn_ReverseStockSplitMember" xlink:type="locator"/>
    <link:label xlink:label="dffn_ReverseStockSplitMember-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Reverse Stock Split [Member ]</link:label>
    <link:label xlink:label="dffn_ReverseStockSplitMember-label" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The conversion of a reverse stock split where there is a reduction in the shares outstanding.</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dffn_ReverseStockSplitMember" xlink:to="dffn_ReverseStockSplitMember-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_CashAndCashEquivalentsAtCarryingValue-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash and cash equivalents</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:to="us-gaap_CashAndCashEquivalentsAtCarryingValue-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AllocatedShareBasedCompensationExpense" xlink:label="us-gaap_AllocatedShareBasedCompensationExpense" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_AllocatedShareBasedCompensationExpense-label" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Stock-based compensation expense</link:label>
    <link:label xlink:label="us-gaap_AllocatedShareBasedCompensationExpense-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">us-gaap_AllocatedShareBasedCompensationExpense</link:label>
    <link:label xlink:label="us-gaap_AllocatedShareBasedCompensationExpense-label" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Share-Based Payment Arrangement, Expense</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AllocatedShareBasedCompensationExpense" xlink:to="us-gaap_AllocatedShareBasedCompensationExpense-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CashAndCashEquivalentsPolicyTextBlock" xlink:label="us-gaap_CashAndCashEquivalentsPolicyTextBlock" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_CashAndCashEquivalentsPolicyTextBlock-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash and Cash Equivalents, Policy [Policy Text Block]</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CashAndCashEquivalentsPolicyTextBlock" xlink:to="us-gaap_CashAndCashEquivalentsPolicyTextBlock-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_DocumentQuarterlyReport" xlink:label="dei_DocumentQuarterlyReport" xlink:type="locator"/>
    <link:label xlink:label="dei_DocumentQuarterlyReport-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Document Quarterly Report</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentQuarterlyReport" xlink:to="dei_DocumentQuarterlyReport-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_AmendmentFlag" xlink:label="dei_AmendmentFlag" xlink:type="locator"/>
    <link:label xlink:label="dei_AmendmentFlag-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Amendment Flag</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_AmendmentFlag" xlink:to="dei_AmendmentFlag-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityIncorporationStateCountryCode" xlink:label="dei_EntityIncorporationStateCountryCode" xlink:type="locator"/>
    <link:label xlink:label="dei_EntityIncorporationStateCountryCode-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity Incorporation, State or Country Code</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityIncorporationStateCountryCode" xlink:to="dei_EntityIncorporationStateCountryCode-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GeneralAndAdministrativeExpenseMember" xlink:label="us-gaap_GeneralAndAdministrativeExpenseMember" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_GeneralAndAdministrativeExpenseMember-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">General and Administrative Expense [Member]</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_GeneralAndAdministrativeExpenseMember" xlink:to="us-gaap_GeneralAndAdministrativeExpenseMember-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccountingPoliciesAbstract" xlink:label="us-gaap_AccountingPoliciesAbstract" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_AccountingPoliciesAbstract-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Accounting Policies [Abstract]</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AccountingPoliciesAbstract" xlink:to="us-gaap_AccountingPoliciesAbstract-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ComprehensiveIncomeNetOfTaxAbstract" xlink:label="us-gaap_ComprehensiveIncomeNetOfTaxAbstract" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_ComprehensiveIncomeNetOfTaxAbstract-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Comprehensive loss:</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ComprehensiveIncomeNetOfTaxAbstract" xlink:to="us-gaap_ComprehensiveIncomeNetOfTaxAbstract-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SignificantAccountingPoliciesTextBlock" xlink:label="us-gaap_SignificantAccountingPoliciesTextBlock" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_SignificantAccountingPoliciesTextBlock-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Significant Accounting Policies [Text Block]</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SignificantAccountingPoliciesTextBlock" xlink:to="us-gaap_SignificantAccountingPoliciesTextBlock-label" xlink:type="arc"/>
    <link:loc xlink:href="dffn-20220331.xsd#dffn_WarrantsIssuedInConnectionWithTheDecember2019OfferingMember" xlink:label="dffn_WarrantsIssuedInConnectionWithTheDecember2019OfferingMember" xlink:type="locator"/>
    <link:label xlink:label="dffn_WarrantsIssuedInConnectionWithTheDecember2019OfferingMember-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Warrants Issued in Connection with the December 2019 Offering [Member]</link:label>
    <link:label xlink:label="dffn_WarrantsIssuedInConnectionWithTheDecember2019OfferingMember-label" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the information pertaining to the warrants issued in connection to the December 2019 public offering.</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dffn_WarrantsIssuedInConnectionWithTheDecember2019OfferingMember" xlink:to="dffn_WarrantsIssuedInConnectionWithTheDecember2019OfferingMember-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ComprehensiveIncomeNetOfTax" xlink:label="us-gaap_ComprehensiveIncomeNetOfTax" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_ComprehensiveIncomeNetOfTax-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">us-gaap_ComprehensiveIncomeNetOfTax</link:label>
    <link:label xlink:label="us-gaap_ComprehensiveIncomeNetOfTax-label" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Comprehensive loss</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ComprehensiveIncomeNetOfTax" xlink:to="us-gaap_ComprehensiveIncomeNetOfTax-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_DocumentTransitionReport" xlink:label="dei_DocumentTransitionReport" xlink:type="locator"/>
    <link:label xlink:label="dei_DocumentTransitionReport-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Document Transition Report</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentTransitionReport" xlink:to="dei_DocumentTransitionReport-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_CityAreaCode" xlink:label="dei_CityAreaCode" xlink:type="locator"/>
    <link:label xlink:label="dei_CityAreaCode-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">City Area Code</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_CityAreaCode" xlink:to="dei_CityAreaCode-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BasisOfAccountingPolicyPolicyTextBlock" xlink:label="us-gaap_BasisOfAccountingPolicyPolicyTextBlock" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_BasisOfAccountingPolicyPolicyTextBlock-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Basis of Accounting, Policy [Policy Text Block]</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_BasisOfAccountingPolicyPolicyTextBlock" xlink:to="us-gaap_BasisOfAccountingPolicyPolicyTextBlock-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_UseOfEstimates" xlink:label="us-gaap_UseOfEstimates" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_UseOfEstimates-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Use of Estimates, Policy [Policy Text Block]</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_UseOfEstimates" xlink:to="us-gaap_UseOfEstimates-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock" xlink:label="us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">New Accounting Pronouncements, Policy [Policy Text Block]</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock" xlink:to="us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityInteractiveDataCurrent" xlink:label="dei_EntityInteractiveDataCurrent" xlink:type="locator"/>
    <link:label xlink:label="dei_EntityInteractiveDataCurrent-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity Interactive Data Current</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityInteractiveDataCurrent" xlink:to="dei_EntityInteractiveDataCurrent-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SharesOutstanding" xlink:label="us-gaap_SharesOutstanding" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_SharesOutstanding-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">us-gaap_SharesOutstanding</link:label>
    <link:label xlink:label="us-gaap_SharesOutstanding-label" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US">Balance (in shares)</link:label>
    <link:label xlink:label="us-gaap_SharesOutstanding-label" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US">Balance (in shares)</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SharesOutstanding" xlink:to="us-gaap_SharesOutstanding-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_SecurityExchangeName" xlink:label="dei_SecurityExchangeName" xlink:type="locator"/>
    <link:label xlink:label="dei_SecurityExchangeName-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Security Exchange Name</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_SecurityExchangeName" xlink:to="dei_SecurityExchangeName-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonStockSharesOutstanding" xlink:label="us-gaap_CommonStockSharesOutstanding" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_CommonStockSharesOutstanding-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Common stock, shares outstanding (in shares)</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CommonStockSharesOutstanding" xlink:to="us-gaap_CommonStockSharesOutstanding-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PreferredStockSharesOutstanding" xlink:label="us-gaap_PreferredStockSharesOutstanding" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_PreferredStockSharesOutstanding-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Preferred stock, outstanding (in shares)</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PreferredStockSharesOutstanding" xlink:to="us-gaap_PreferredStockSharesOutstanding-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_Security12bTitle" xlink:label="dei_Security12bTitle" xlink:type="locator"/>
    <link:label xlink:label="dei_Security12bTitle-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Title of 12(b) Security</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_Security12bTitle" xlink:to="dei_Security12bTitle-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_CurrentFiscalYearEndDate" xlink:label="dei_CurrentFiscalYearEndDate" xlink:type="locator"/>
    <link:label xlink:label="dei_CurrentFiscalYearEndDate-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Current Fiscal Year End Date</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_CurrentFiscalYearEndDate" xlink:to="dei_CurrentFiscalYearEndDate-label" xlink:type="arc"/>
    <link:loc xlink:href="dffn-20220331.xsd#dffn_ClassOfWarrantOrRightsExpired" xlink:label="dffn_ClassOfWarrantOrRightsExpired" xlink:type="locator"/>
    <link:label xlink:label="dffn_ClassOfWarrantOrRightsExpired-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">dffn_ClassOfWarrantOrRightsExpired</link:label>
    <link:label xlink:label="dffn_ClassOfWarrantOrRightsExpired-label" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Class of Warrant or Rights, Expired (in shares)</link:label>
    <link:label xlink:label="dffn_ClassOfWarrantOrRightsExpired-label" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Number of warrants or rights expired.</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dffn_ClassOfWarrantOrRightsExpired" xlink:to="dffn_ClassOfWarrantOrRightsExpired-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets" xlink:label="us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets</link:label>
    <link:label xlink:label="us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets-label" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Prepaid expenses, deposits and other assets</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets" xlink:to="us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ResearchAndDevelopmentExpenseMember" xlink:label="us-gaap_ResearchAndDevelopmentExpenseMember" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_ResearchAndDevelopmentExpenseMember-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Research and Development Expense [Member]</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ResearchAndDevelopmentExpenseMember" xlink:to="us-gaap_ResearchAndDevelopmentExpenseMember-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_DocumentFiscalPeriodFocus" xlink:label="dei_DocumentFiscalPeriodFocus" xlink:type="locator"/>
    <link:label xlink:label="dei_DocumentFiscalPeriodFocus-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Document Fiscal Period Focus</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentFiscalPeriodFocus" xlink:to="dei_DocumentFiscalPeriodFocus-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_DocumentFiscalYearFocus" xlink:label="dei_DocumentFiscalYearFocus" xlink:type="locator"/>
    <link:label xlink:label="dei_DocumentFiscalYearFocus-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Document Fiscal Year Focus</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentFiscalYearFocus" xlink:to="dei_DocumentFiscalYearFocus-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_DocumentPeriodEndDate" xlink:label="dei_DocumentPeriodEndDate" xlink:type="locator"/>
    <link:label xlink:label="dei_DocumentPeriodEndDate-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Document Period End Date</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentPeriodEndDate" xlink:to="dei_DocumentPeriodEndDate-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeStatementLocationAxis" xlink:label="us-gaap_IncomeStatementLocationAxis" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_IncomeStatementLocationAxis-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Income Statement Location [Axis]</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncomeStatementLocationAxis" xlink:to="us-gaap_IncomeStatementLocationAxis-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeStatementLocationDomain" xlink:label="us-gaap_IncomeStatementLocationDomain" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_IncomeStatementLocationDomain-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Income Statement Location [Domain]</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncomeStatementLocationDomain" xlink:to="us-gaap_IncomeStatementLocationDomain-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityFileNumber" xlink:label="dei_EntityFileNumber" xlink:type="locator"/>
    <link:label xlink:label="dei_EntityFileNumber-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity File Number</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityFileNumber" xlink:to="dei_EntityFileNumber-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NonmonetaryTransactionTypeDomain" xlink:label="us-gaap_NonmonetaryTransactionTypeDomain" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_NonmonetaryTransactionTypeDomain-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Nonmonetary Transaction Type [Domain]</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NonmonetaryTransactionTypeDomain" xlink:to="us-gaap_NonmonetaryTransactionTypeDomain-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityEmergingGrowthCompany" xlink:label="dei_EntityEmergingGrowthCompany" xlink:type="locator"/>
    <link:label xlink:label="dei_EntityEmergingGrowthCompany-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity Emerging Growth Company</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityEmergingGrowthCompany" xlink:to="dei_EntityEmergingGrowthCompany-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_DocumentType" xlink:label="dei_DocumentType" xlink:type="locator"/>
    <link:label xlink:label="dei_DocumentType-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Document Type</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentType" xlink:to="dei_DocumentType-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntitySmallBusiness" xlink:label="dei_EntitySmallBusiness" xlink:type="locator"/>
    <link:label xlink:label="dei_EntitySmallBusiness-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity Small Business</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntitySmallBusiness" xlink:to="dei_EntitySmallBusiness-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityShellCompany" xlink:label="dei_EntityShellCompany" xlink:type="locator"/>
    <link:label xlink:label="dei_EntityShellCompany-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity Shell Company</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityShellCompany" xlink:to="dei_EntityShellCompany-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NonmonetaryTransactionTypeAxis" xlink:label="us-gaap_NonmonetaryTransactionTypeAxis" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_NonmonetaryTransactionTypeAxis-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Nonmonetary Transaction Type [Axis]</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NonmonetaryTransactionTypeAxis" xlink:to="us-gaap_NonmonetaryTransactionTypeAxis-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_DocumentInformationLineItems" xlink:label="dei_DocumentInformationLineItems" xlink:type="locator"/>
    <link:label xlink:label="dei_DocumentInformationLineItems-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Document Information [Line Items]</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_DocumentInformationLineItems-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_DocumentInformationTable" xlink:label="dei_DocumentInformationTable" xlink:type="locator"/>
    <link:label xlink:label="dei_DocumentInformationTable-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Document Information [Table]</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentInformationTable" xlink:to="dei_DocumentInformationTable-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityFilerCategory" xlink:label="dei_EntityFilerCategory" xlink:type="locator"/>
    <link:label xlink:label="dei_EntityFilerCategory-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity Filer Category</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityFilerCategory" xlink:to="dei_EntityFilerCategory-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityCurrentReportingStatus" xlink:label="dei_EntityCurrentReportingStatus" xlink:type="locator"/>
    <link:label xlink:label="dei_EntityCurrentReportingStatus-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity Current Reporting Status</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityCurrentReportingStatus" xlink:to="dei_EntityCurrentReportingStatus-label" xlink:type="arc"/>
    <link:loc xlink:href="dffn-20220331.xsd#dffn_ConversionOfSeriesCPreferredStockIntoCommonStockMember" xlink:label="dffn_ConversionOfSeriesCPreferredStockIntoCommonStockMember" xlink:type="locator"/>
    <link:label xlink:label="dffn_ConversionOfSeriesCPreferredStockIntoCommonStockMember-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Conversion of Series C Preferred Stock into Common Stock [Member]</link:label>
    <link:label xlink:label="dffn_ConversionOfSeriesCPreferredStockIntoCommonStockMember-label" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the converison of series C preferred stock into common stock.</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dffn_ConversionOfSeriesCPreferredStockIntoCommonStockMember" xlink:to="dffn_ConversionOfSeriesCPreferredStockIntoCommonStockMember-label" xlink:type="arc"/>
    <link:loc xlink:href="dffn-20220331.xsd#dffn_CommonStockWarrantsIssuedRelatedToFebruary2021CommonStockOfferingMember" xlink:label="dffn_CommonStockWarrantsIssuedRelatedToFebruary2021CommonStockOfferingMember" xlink:type="locator"/>
    <link:label xlink:label="dffn_CommonStockWarrantsIssuedRelatedToFebruary2021CommonStockOfferingMember-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Common Stock Warrants Issued Related to February 2021 Common Stock Offering [Member]</link:label>
    <link:label xlink:label="dffn_CommonStockWarrantsIssuedRelatedToFebruary2021CommonStockOfferingMember-label" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the common stock warrants issued related to the February 2021 common stock offering.</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dffn_CommonStockWarrantsIssuedRelatedToFebruary2021CommonStockOfferingMember" xlink:to="dffn_CommonStockWarrantsIssuedRelatedToFebruary2021CommonStockOfferingMember-label" xlink:type="arc"/>
    <link:loc xlink:href="dffn-20220331.xsd#dffn_ReverseStockSplitFractionalSharesCashMultiple" xlink:label="dffn_ReverseStockSplitFractionalSharesCashMultiple" xlink:type="locator"/>
    <link:label xlink:label="dffn_ReverseStockSplitFractionalSharesCashMultiple-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">dffn_ReverseStockSplitFractionalSharesCashMultiple</link:label>
    <link:label xlink:label="dffn_ReverseStockSplitFractionalSharesCashMultiple-label" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Reverse Stock Split, Fractional Shares, Cash, Multiple (in dollars per share)</link:label>
    <link:label xlink:label="dffn_ReverseStockSplitFractionalSharesCashMultiple-label" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The per share multiple used to determine the price paid for franctional share in a stock reverse split.</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dffn_ReverseStockSplitFractionalSharesCashMultiple" xlink:to="dffn_ReverseStockSplitFractionalSharesCashMultiple-label" xlink:type="arc"/>
    <link:loc xlink:href="dffn-20220331.xsd#dffn_MarketableSecuritiesContractualMaturity" xlink:label="dffn_MarketableSecuritiesContractualMaturity" xlink:type="locator"/>
    <link:label xlink:label="dffn_MarketableSecuritiesContractualMaturity-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">dffn_MarketableSecuritiesContractualMaturity</link:label>
    <link:label xlink:label="dffn_MarketableSecuritiesContractualMaturity-label" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Marketable Securities Contractual Maturity (Month)</link:label>
    <link:label xlink:label="dffn_MarketableSecuritiesContractualMaturity-label" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The contractual maturity of marketable securities.</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dffn_MarketableSecuritiesContractualMaturity" xlink:to="dffn_MarketableSecuritiesContractualMaturity-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount" xlink:label="us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Anti-dilutive securities (in shares)</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount" xlink:to="us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount-label" xlink:type="arc"/>
    <link:loc xlink:href="dffn-20220331.xsd#dffn_StockIssuedDuringPeriodFractionalSharesReverseStockSplit" xlink:label="dffn_StockIssuedDuringPeriodFractionalSharesReverseStockSplit" xlink:type="locator"/>
    <link:label xlink:label="dffn_StockIssuedDuringPeriodFractionalSharesReverseStockSplit-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">dffn_StockIssuedDuringPeriodFractionalSharesReverseStockSplit</link:label>
    <link:label xlink:label="dffn_StockIssuedDuringPeriodFractionalSharesReverseStockSplit-label" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Stock Issued During Period, Fractional Shares, Reverse Stock Split (in shares)</link:label>
    <link:label xlink:label="dffn_StockIssuedDuringPeriodFractionalSharesReverseStockSplit-label" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the number of fractional shares were issued in connection with the Reverse Stock Split.</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dffn_StockIssuedDuringPeriodFractionalSharesReverseStockSplit" xlink:to="dffn_StockIssuedDuringPeriodFractionalSharesReverseStockSplit-label" xlink:type="arc"/>
    <link:loc xlink:href="dffn-20220331.xsd#dffn_CommonStockWarrantsIssuedRelatedToMay2020CommonStockOfferingMember" xlink:label="dffn_CommonStockWarrantsIssuedRelatedToMay2020CommonStockOfferingMember" xlink:type="locator"/>
    <link:label xlink:label="dffn_CommonStockWarrantsIssuedRelatedToMay2020CommonStockOfferingMember-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Common Stock Warrants Issued Related to May 2020 Common Stock Offering [Member]</link:label>
    <link:label xlink:label="dffn_CommonStockWarrantsIssuedRelatedToMay2020CommonStockOfferingMember-label" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the common stock warrants issued related to the May 2020 common stock offering.</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dffn_CommonStockWarrantsIssuedRelatedToMay2020CommonStockOfferingMember" xlink:to="dffn_CommonStockWarrantsIssuedRelatedToMay2020CommonStockOfferingMember-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue" xlink:label="us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Stock-based compensation expense</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue" xlink:to="us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityTaxIdentificationNumber" xlink:label="dei_EntityTaxIdentificationNumber" xlink:type="locator"/>
    <link:label xlink:label="dei_EntityTaxIdentificationNumber-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity Tax Identification Number</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityTaxIdentificationNumber" xlink:to="dei_EntityTaxIdentificationNumber-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityCentralIndexKey" xlink:label="dei_EntityCentralIndexKey" xlink:type="locator"/>
    <link:label xlink:label="dei_EntityCentralIndexKey-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity Central Index Key</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityCentralIndexKey" xlink:to="dei_EntityCentralIndexKey-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityRegistrantName" xlink:label="dei_EntityRegistrantName" xlink:type="locator"/>
    <link:label xlink:label="dei_EntityRegistrantName-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity Registrant Name</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityRegistrantName" xlink:to="dei_EntityRegistrantName-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition" xlink:label="us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Stock-based compensation expense and vesting of restricted stock units</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition" xlink:to="us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" xlink:type="locator"/>
    <link:label xlink:label="dei_EntityDomain-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity [Domain]</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityDomain" xlink:to="dei_EntityDomain-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" xlink:type="locator"/>
    <link:label xlink:label="dei_LegalEntityAxis-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Legal Entity [Axis]</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_LegalEntityAxis" xlink:to="dei_LegalEntityAxis-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementTable" xlink:label="us-gaap_StatementTable" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_StatementTable-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Statement [Table]</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StatementTable" xlink:to="us-gaap_StatementTable-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityAddressAddressLine1" xlink:label="dei_EntityAddressAddressLine1" xlink:type="locator"/>
    <link:label xlink:label="dei_EntityAddressAddressLine1-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity Address, Address Line One</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityAddressAddressLine1" xlink:to="dei_EntityAddressAddressLine1-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementOfFinancialPositionAbstract" xlink:label="us-gaap_StatementOfFinancialPositionAbstract" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_StatementOfFinancialPositionAbstract-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Statement of Financial Position [Abstract]</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StatementOfFinancialPositionAbstract" xlink:to="us-gaap_StatementOfFinancialPositionAbstract-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic" xlink:label="us-gaap_WeightedAverageNumberOfSharesOutstandingBasic" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_WeightedAverageNumberOfSharesOutstandingBasic-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Weighted average shares outstanding, basic and diluted (in shares)</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_WeightedAverageNumberOfSharesOutstandingBasic" xlink:to="us-gaap_WeightedAverageNumberOfSharesOutstandingBasic-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityAddressCityOrTown" xlink:label="dei_EntityAddressCityOrTown" xlink:type="locator"/>
    <link:label xlink:label="dei_EntityAddressCityOrTown-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity Address, City or Town</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityAddressCityOrTown" xlink:to="dei_EntityAddressCityOrTown-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityAddressPostalZipCode" xlink:label="dei_EntityAddressPostalZipCode" xlink:type="locator"/>
    <link:label xlink:label="dei_EntityAddressPostalZipCode-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity Address, Postal Zip Code</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityAddressPostalZipCode" xlink:to="dei_EntityAddressPostalZipCode-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EarningsPerShareBasic" xlink:label="us-gaap_EarningsPerShareBasic" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_EarningsPerShareBasic-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net loss per share of common stock, basic and diluted (in dollars per share)</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_EarningsPerShareBasic" xlink:to="us-gaap_EarningsPerShareBasic-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityAddressStateOrProvince" xlink:label="dei_EntityAddressStateOrProvince" xlink:type="locator"/>
    <link:label xlink:label="dei_EntityAddressStateOrProvince-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity Address, State or Province</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityAddressStateOrProvince" xlink:to="dei_EntityAddressStateOrProvince-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementOfCashFlowsAbstract" xlink:label="us-gaap_StatementOfCashFlowsAbstract" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_StatementOfCashFlowsAbstract-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Statement of Cash Flows [Abstract]</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StatementOfCashFlowsAbstract" xlink:to="us-gaap_StatementOfCashFlowsAbstract-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityCommonStockSharesOutstanding" xlink:label="dei_EntityCommonStockSharesOutstanding" xlink:type="locator"/>
    <link:label xlink:label="dei_EntityCommonStockSharesOutstanding-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity Common Stock, Shares Outstanding</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityCommonStockSharesOutstanding" xlink:to="dei_EntityCommonStockSharesOutstanding-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DepreciationNonproduction" xlink:label="us-gaap_DepreciationNonproduction" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_DepreciationNonproduction-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">us-gaap_DepreciationNonproduction</link:label>
    <link:label xlink:label="us-gaap_DepreciationNonproduction-label" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Depreciation</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DepreciationNonproduction" xlink:to="us-gaap_DepreciationNonproduction-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementOfStockholdersEquityAbstract" xlink:label="us-gaap_StatementOfStockholdersEquityAbstract" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_StatementOfStockholdersEquityAbstract-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Statement of Stockholders' Equity [Abstract]</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StatementOfStockholdersEquityAbstract" xlink:to="us-gaap_StatementOfStockholdersEquityAbstract-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeStatementAbstract" xlink:label="us-gaap_IncomeStatementAbstract" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_IncomeStatementAbstract-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Income Statement [Abstract]</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncomeStatementAbstract" xlink:to="us-gaap_IncomeStatementAbstract-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherCurrentLiabilitiesTableTextBlock" xlink:label="us-gaap_OtherCurrentLiabilitiesTableTextBlock" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_OtherCurrentLiabilitiesTableTextBlock-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Current Liabilities [Table Text Block]</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OtherCurrentLiabilitiesTableTextBlock" xlink:to="us-gaap_OtherCurrentLiabilitiesTableTextBlock-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_TradingSymbol" xlink:label="dei_TradingSymbol" xlink:type="locator"/>
    <link:label xlink:label="dei_TradingSymbol-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Trading Symbol</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_TradingSymbol" xlink:to="dei_TradingSymbol-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NatureOfOperations" xlink:label="us-gaap_NatureOfOperations" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_NatureOfOperations-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Nature of Operations [Text Block]</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NatureOfOperations" xlink:to="us-gaap_NatureOfOperations-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities" xlink:label="us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Issuance of common stock upon exercise of warrants, net of issuance costs</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities" xlink:to="us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities" xlink:label="us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Issuance of common stock upon exercise of warrants, net of issuance costs (in shares)</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities" xlink:to="us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_LocalPhoneNumber" xlink:label="dei_LocalPhoneNumber" xlink:type="locator"/>
    <link:label xlink:label="dei_LocalPhoneNumber-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Local Phone Number</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_LocalPhoneNumber" xlink:to="dei_LocalPhoneNumber-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised" xlink:label="us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised</link:label>
    <link:label xlink:label="us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised-label" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares)</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised" xlink:to="us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TableTextBlock" xlink:label="us-gaap_TableTextBlock" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_TableTextBlock-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">us-gaap_TableTextBlock</link:label>
    <link:label xlink:label="us-gaap_TableTextBlock-label" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Notes Tables</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_TableTextBlock" xlink:to="us-gaap_TableTextBlock-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures" xlink:label="us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Stock-based compensation expense and vesting of restricted stock units (in shares)</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures" xlink:to="us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures-label" xlink:type="arc"/>
    <link:loc xlink:href="dffn-20220331.xsd#dffn_WarrantsIssuedInConnectionWithTheJanuary2018OfferingMember" xlink:label="dffn_WarrantsIssuedInConnectionWithTheJanuary2018OfferingMember" xlink:type="locator"/>
    <link:label xlink:label="dffn_WarrantsIssuedInConnectionWithTheJanuary2018OfferingMember-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Warrants Issued in Connection with the January 2018 Offering [Member]</link:label>
    <link:label xlink:label="dffn_WarrantsIssuedInConnectionWithTheJanuary2018OfferingMember-label" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the information pertaining to the warrants issued in connection to the January 2018 public offering.</link:label>
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    <link:label xlink:label="dffn_WarrantsIssuedInConnectionWithTheNovember2019OfferingMember-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Warrants Issued in Connection with the November 2019 Offering [Member]</link:label>
    <link:label xlink:label="dffn_WarrantsIssuedInConnectionWithTheNovember2019OfferingMember-label" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the information pertaining to the warrants issued in connection to the November 2019 public offering.</link:label>
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    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisTextBlock" xlink:label="us-gaap_FairValueAssetsMeasuredOnRecurringBasisTextBlock" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_FairValueAssetsMeasuredOnRecurringBasisTextBlock-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value, Assets Measured on Recurring Basis [Table Text Block]</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueAssetsMeasuredOnRecurringBasisTextBlock" xlink:to="us-gaap_FairValueAssetsMeasuredOnRecurringBasisTextBlock-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Granted (in shares)</link:label>
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    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod</link:label>
    <link:label xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod-label" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Cancelled/forfeited (in shares)</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockIssuedDuringPeriodSharesNewIssues" xlink:label="us-gaap_StockIssuedDuringPeriodSharesNewIssues" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_StockIssuedDuringPeriodSharesNewIssues-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Sale of common stock (in shares)</link:label>
    <link:label xlink:label="us-gaap_StockIssuedDuringPeriodSharesNewIssues-label" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Stock Issued During Period, Shares, New Issues (in shares)</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssuedDuringPeriodSharesNewIssues" xlink:to="us-gaap_StockIssuedDuringPeriodSharesNewIssues-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LiabilitiesAndStockholdersEquity" xlink:label="us-gaap_LiabilitiesAndStockholdersEquity" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_LiabilitiesAndStockholdersEquity-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">us-gaap_LiabilitiesAndStockholdersEquity</link:label>
    <link:label xlink:label="us-gaap_LiabilitiesAndStockholdersEquity-label" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total liabilities and stockholders' equity</link:label>
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    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockIssuedDuringPeriodValueNewIssues" xlink:label="us-gaap_StockIssuedDuringPeriodValueNewIssues" xlink:type="locator"/>
    <link:label xlink:label="us-gaap_StockIssuedDuringPeriodValueNewIssues-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Sale of common stock</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssuedDuringPeriodValueNewIssues" xlink:to="us-gaap_StockIssuedDuringPeriodValueNewIssues-label" xlink:type="arc"/>
    <link:loc xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SeriesCPreferredStockMember" xlink:label="us-gaap_SeriesCPreferredStockMember" xlink:type="locator"/>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SeriesCPreferredStockMember" xlink:to="us-gaap_SeriesCPreferredStockMember-label" xlink:type="arc"/>
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    <link:label xlink:label="us-gaap_RetainedEarningsAccumulatedDeficit-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Accumulated deficit</link:label>
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<span style="display: none;">v3.22.1</span><table class="report" border="0" cellspacing="2" id="idm140295877910664">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Document And Entity Information - shares<br></strong></div></th>
<th class="th" colspan="1">3 Months Ended</th>
<th class="th" colspan="1"></th>
</tr>
<tr>
<th class="th"><div>Mar. 31, 2022</div></th>
<th class="th"><div>May 11, 2022</div></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_dei_DocumentInformationLineItems', window );"><strong>Document Information [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
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<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_dei_EntityCentralIndexKey', window );">Entity Central Index Key</a></td>
<td class="text">0001053691<span></span>
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<td class="text">&#160;<span></span>
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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_dei_EntityRegistrantName', window );">Entity Registrant Name</a></td>
<td class="text">Diffusion Pharmaceuticals Inc.<span></span>
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<td class="text">&#160;<span></span>
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<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_dei_AmendmentFlag', window );">Amendment Flag</a></td>
<td class="text">false<span></span>
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<td class="text">&#160;<span></span>
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<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_CurrentFiscalYearEndDate', window );">Current Fiscal Year End Date</a></td>
<td class="text">--12-31<span></span>
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<td class="text">&#160;<span></span>
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<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_dei_DocumentFiscalPeriodFocus', window );">Document Fiscal Period Focus</a></td>
<td class="text">Q1<span></span>
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<td class="text">&#160;<span></span>
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<td class="pl custom" 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">2022<span></span>
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<td class="text">&#160;<span></span>
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<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_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 custom" 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="pl custom" 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">Mar. 31,  2022<span></span>
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<td class="text">&#160;<span></span>
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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_dei_DocumentTransitionReport', window );">Document Transition Report</a></td>
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<td class="text">000-24477<span></span>
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<td class="text">&#160;<span></span>
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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_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 custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityTaxIdentificationNumber', window );">Entity Tax Identification Number</a></td>
<td class="text">30-0645032<span></span>
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<td class="text">&#160;<span></span>
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<td class="pl custom" 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">300 East Main Street, Suite 201<span></span>
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<td class="text">&#160;<span></span>
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<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_dei_EntityAddressCityOrTown', window );">Entity Address, City or Town</a></td>
<td class="text">Charlottesville<span></span>
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<td class="text">&#160;<span></span>
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<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityAddressStateOrProvince', window );">Entity Address, State or Province</a></td>
<td class="text">VA<span></span>
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<td class="text">&#160;<span></span>
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<td class="pl custom" 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">22902<span></span>
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<td class="text">&#160;<span></span>
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<td class="pl custom" 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">434<span></span>
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<td class="text">&#160;<span></span>
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<td class="text">220-0718<span></span>
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<td class="text">&#160;<span></span>
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<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_Security12bTitle', window );">Title of 12(b) Security</a></td>
<td class="text">Common Stock, par value $0.001 per share<span></span>
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<td class="text">&#160;<span></span>
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<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_TradingSymbol', window );">Trading Symbol</a></td>
<td class="text">DFFN<span></span>
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<td class="text">&#160;<span></span>
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<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_SecurityExchangeName', window );">Security Exchange Name</a></td>
<td class="text">NASDAQ<span></span>
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<td class="text">&#160;<span></span>
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<td class="pl custom" 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="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityInteractiveDataCurrent', window );">Entity Interactive Data Current</a></td>
<td class="text">Yes<span></span>
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<td class="text">&#160;<span></span>
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<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityFilerCategory', window );">Entity Filer Category</a></td>
<td class="text">Non-accelerated Filer<span></span>
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<td class="text">&#160;<span></span>
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<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntitySmallBusiness', window );">Entity Small Business</a></td>
<td class="text">true<span></span>
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<td class="text">&#160;<span></span>
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<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityEmergingGrowthCompany', window );">Entity Emerging Growth Company</a></td>
<td class="text">false<span></span>
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<td class="text">&#160;<span></span>
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<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityShellCompany', window );">Entity Shell Company</a></td>
<td class="text">false<span></span>
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<td class="text">&#160;<span></span>
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<td class="pl custom" 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">2,038,592<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 );">- Definition</a><div><p>Area code of city</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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<td style="white-space:nowrap;">dei_CityAreaCode</td>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>End date of current fiscal year in the format --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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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Fiscal period values are FY, Q1, Q2, and Q3.  1st, 2nd and 3rd quarter 10-Q or 10-QT statements have value Q1, Q2, and Q3 respectively, with 10-K, 10-KT or other fiscal year statements having FY.</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>This is focus fiscal year of the document report in YYYY format. For a 2006 annual report, which may also provide financial information from prior periods, fiscal 2006 should be given as the fiscal year focus. Example: 2006.</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>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">
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</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_DocumentPeriodEndDate">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></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 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">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_DocumentPeriodEndDate</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: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_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_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 Exchange Act<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 Exchange Act<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 Exchange Act<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 Exchange Act<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 Exchange Act<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 Exchange Act<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 Exchange Act<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>13
<FILENAME>R2.htm
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
<html>
<head>
<title></title>
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<span style="display: none;">v3.22.1</span><table class="report" border="0" cellspacing="2" id="idm140295878195896">
<tr>
<th class="tl" colspan="1" rowspan="1"><div style="width: 200px;"><strong>Consolidated Balance Sheets (Current Period Unaudited) - USD ($)<br></strong></div></th>
<th class="th"><div>Mar. 31, 2022</div></th>
<th class="th"><div>Dec. 31, 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_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 custom" 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">$ 9,872,330<span></span>
</td>
<td class="nump">$ 37,313,558<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_us-gaap_MarketableSecuritiesCurrent', window );">Marketable securities</a></td>
<td class="nump">22,680,303<span></span>
</td>
<td class="nump">0<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_dffn_PrepaidExpensesDepositsAndOtherAssets', window );">Prepaid expenses, deposits and other current assets</a></td>
<td class="nump">1,021,496<span></span>
</td>
<td class="nump">510,015<span></span>
</td>
</tr>
<tr class="reu">
<td class="pl custom" 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">33,574,129<span></span>
</td>
<td class="nump">37,823,573<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_us-gaap_OtherAssetsNoncurrent', window );">Other assets</a></td>
<td class="nump">0<span></span>
</td>
<td class="nump">15,578<span></span>
</td>
</tr>
<tr class="reu">
<td class="pl custom" 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">33,574,129<span></span>
</td>
<td class="nump">37,839,151<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 custom" 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</a></td>
<td class="nump">813,197<span></span>
</td>
<td class="nump">947,495<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_us-gaap_OtherAccruedLiabilitiesCurrent', window );">Accrued expenses and other current liabilities</a></td>
<td class="nump">2,142,633<span></span>
</td>
<td class="nump">1,980,189<span></span>
</td>
</tr>
<tr class="reu">
<td class="pl custom" 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">2,955,830<span></span>
</td>
<td class="nump">2,927,684<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_us-gaap_CommitmentsAndContingencies', window );">Commitments and Contingencies (Note 9)</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_EquityAbstract', 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 custom" 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, $0.001 par value: 1,000,000,000 shares authorized; 2,038,392 and 2,038,185 shares issued and outstanding at March 31, 2022 and December 31, 2021, respectively</a></td>
<td class="nump">2,038<span></span>
</td>
<td class="nump">2,038<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_us-gaap_AdditionalPaidInCapitalCommonStock', window );">Additional paid-in capital</a></td>
<td class="nump">165,192,671<span></span>
</td>
<td class="nump">164,914,540<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_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax', window );">Accumulated other comprehensive loss</a></td>
<td class="num">(49,658)<span></span>
</td>
<td class="nump">0<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_us-gaap_RetainedEarningsAccumulatedDeficit', window );">Accumulated deficit</a></td>
<td class="num">(134,531,752)<span></span>
</td>
<td class="num">(130,005,111)<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_us-gaap_StockholdersEquity', window );">Total stockholders' equity</a></td>
<td class="nump">30,618,299<span></span>
</td>
<td class="nump">34,911,467<span></span>
</td>
</tr>
<tr class="reu">
<td class="pl custom" 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' equity</a></td>
<td class="nump">33,574,129<span></span>
</td>
<td class="nump">37,839,151<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_StatementClassOfStockAxis=us-gaap_SeriesCPreferredStockMember', window );">Series C Preferred Stock [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_EquityAbstract', 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 custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PreferredStockValue', window );">Series C convertible preferred stock, $0.001 par value: 10,000 shares authorized; 10,000 and 0 shares issued and outstanding at March 31, 2022 and December 31, 2021, respectively</a></td>
<td class="nump">$ 5,000<span></span>
</td>
<td class="nump">$ 0<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dffn_PrepaidExpensesDepositsAndOtherAssets">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></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 consideration paid in advance for costs that provide economic benefits within a future period, amounts transferred third parties for security purposes that are expected to be returned or applied towards payment, and assets not separately disclosed in the balance sheet that are expected to be realized or consumed 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>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;">dffn_PrepaidExpensesDepositsAndOtherAssets</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dffn_</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_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 https://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 https://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_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 https://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 https://asc.fasb.org/extlink&amp;oid=126968391&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 https://asc.fasb.org/extlink&amp;oid=126734703&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 https://asc.fasb.org/extlink&amp;oid=126968391&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 https://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 https://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 https://asc.fasb.org/extlink&amp;oid=126968391&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_AdditionalPaidInCapitalCommonStock">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></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 received from shareholders in common stock-related transactions that are in excess of par value or stated value and amounts received from other stock-related transactions. Includes only common stock transactions (excludes preferred stock transactions). May be called contributed capital, capital in excess of par, capital surplus, or paid-in capital.</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)(1))<br> -URI https://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_AdditionalPaidInCapitalCommonStock</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 https://asc.fasb.org/extlink&amp;oid=126897435&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 https://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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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><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>
<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 45<br> -Paragraph 1<br> -URI https://asc.fasb.org/extlink&amp;oid=124098289&amp;loc=d3e6676-107765<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 https://asc.fasb.org/extlink&amp;oid=84165509&amp;loc=d3e56426-112766<br><br>Reference 3: 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 https://asc.fasb.org/extlink&amp;oid=124433192&amp;loc=SL2890621-112765<br><br>Reference 4: 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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>
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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>
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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 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 https://asc.fasb.org/extlink&amp;oid=126954810&amp;loc=d3e3044-108585<br><br>Reference 2: http://www.xbrl.org/2003/role/exampleRef<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 https://asc.fasb.org/extlink&amp;oid=124098289&amp;loc=d3e6676-107765<br><br>Reference 3: 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(1))<br> -URI https://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>
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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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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></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 https://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 https://asc.fasb.org/extlink&amp;oid=126734703&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 https://asc.fasb.org/extlink&amp;oid=126897435&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_CommitmentsAndContingencies</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>
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</tr>
<tr>
<td><strong> Balance Type:</strong></td>
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<td><strong> Period Type:</strong></td>
<td>instant</td>
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</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>
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<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 https://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 https://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>
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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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<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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<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 );">- 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 https://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 https://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 https://asc.fasb.org/extlink&amp;oid=126897435&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 https://asc.fasb.org/extlink&amp;oid=126734703&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 https://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 https://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 https://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>
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<tr>
<td><strong> Balance Type:</strong></td>
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<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
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</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 https://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 https://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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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><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>
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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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<tr>
<td><strong> Period Type:</strong></td>
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</tr>
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</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_MarketableSecuritiesCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></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 marketable security, classified as current.</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_MarketableSecuritiesCurrent</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>
</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 https://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_OtherAccruedLiabilitiesCurrent</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_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://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(17))<br> -URI https://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_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 https://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 https://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>
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<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
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</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_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 https://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 https://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 944<br> -SubTopic 210<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.7-03(a)(23)(a)(4))<br> -URI https://asc.fasb.org/extlink&amp;oid=126734703&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 944<br> -SubTopic 40<br> -Section 65<br> -Paragraph 2<br> -Subparagraph (h)(2)<br> -URI https://asc.fasb.org/extlink&amp;oid=124501264&amp;loc=SL117420844-207641<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 S99<br> -Paragraph 1<br> -Subparagraph (SX 210.3-04)<br> -URI https://asc.fasb.org/extlink&amp;oid=120397183&amp;loc=d3e187085-122770<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)(i)<br> -URI https://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 https://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 https://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 https://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 https://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 https://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 https://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 https://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 https://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>
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<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>
<td>credit</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;">
<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_StatementClassOfStockAxis=us-gaap_SeriesCPreferredStockMember</td>
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<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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<span style="display: none;">v3.22.1</span><table class="report" border="0" cellspacing="2" id="idm140295877887512">
<tr>
<th class="tl" colspan="1" rowspan="1"><div style="width: 200px;"><strong>Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - $ / shares<br></strong></div></th>
<th class="th"><div>Mar. 31, 2022</div></th>
<th class="th"><div>Dec. 31, 2021</div></th>
</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_us-gaap_CommonStockParOrStatedValuePerShare', window );">Common stock, par value (in dollars per share)</a></td>
<td class="nump">$ 0.001<span></span>
</td>
<td class="nump">$ 0.001<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_us-gaap_CommonStockSharesAuthorized', window );">Common stock, shares authorized (in shares)</a></td>
<td class="nump">1,000,000,000<span></span>
</td>
<td class="nump">1,000,000,000<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_us-gaap_CommonStockSharesIssued', window );">Common stock, shares issued (in shares)</a></td>
<td class="nump">2,038,392<span></span>
</td>
<td class="nump">2,038,185<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_us-gaap_CommonStockSharesOutstanding', window );">Common stock, shares outstanding (in shares)</a></td>
<td class="nump">2,038,392<span></span>
</td>
<td class="nump">2,038,185<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_StatementClassOfStockAxis=us-gaap_SeriesCPreferredStockMember', window );">Series C Preferred 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 custom" 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 (in dollars per share)</a></td>
<td class="nump">$ 0.001<span></span>
</td>
<td class="nump">$ 0.001<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_us-gaap_PreferredStockSharesAuthorized', window );">Preferred stock, authorized (in shares)</a></td>
<td class="nump">10,000<span></span>
</td>
<td class="nump">10,000<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_us-gaap_PreferredStockSharesIssued', window );">Preferred stock, issued (in shares)</a></td>
<td class="nump">10,000<span></span>
</td>
<td class="nump">0<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_us-gaap_PreferredStockSharesOutstanding', window );">Preferred stock, outstanding (in shares)</a></td>
<td class="nump">10,000<span></span>
</td>
<td class="nump">0<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 https://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 https://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 https://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 https://asc.fasb.org/extlink&amp;oid=126973232&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 https://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>
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</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 https://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 https://asc.fasb.org/extlink&amp;oid=126973232&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 https://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 https://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 https://asc.fasb.org/extlink&amp;oid=126973232&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 https://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_StatementClassOfStockAxis=us-gaap_SeriesCPreferredStockMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.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_StatementClassOfStockAxis=us-gaap_SeriesCPreferredStockMember</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>
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<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
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<span style="display: none;">v3.22.1</span><table class="report" border="0" cellspacing="2" id="idm140295878773208">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($)<br></strong></div></th>
<th class="th" colspan="2">3 Months Ended</th>
</tr>
<tr>
<th class="th"><div>Mar. 31, 2022</div></th>
<th class="th"><div>Mar. 31, 2021</div></th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OperatingExpensesAbstract', window );"><strong>Operating expenses:</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ResearchAndDevelopmentExpense', window );">Research and development</a></td>
<td class="nump">$ 2,425,898<span></span>
</td>
<td class="nump">$ 2,916,378<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_us-gaap_GeneralAndAdministrativeExpense', window );">General and administrative</a></td>
<td class="nump">2,128,552<span></span>
</td>
<td class="nump">1,743,510<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_us-gaap_DepreciationNonproduction', window );">Depreciation</a></td>
<td class="nump">0<span></span>
</td>
<td class="nump">24,447<span></span>
</td>
</tr>
<tr class="reu">
<td class="pl custom" 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="nump">4,554,450<span></span>
</td>
<td class="nump">4,684,335<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_us-gaap_InterestIncomeExpenseNonoperatingNet', window );">Interest income</a></td>
<td class="num">(27,809)<span></span>
</td>
<td class="num">(40,416)<span></span>
</td>
</tr>
<tr class="reu">
<td class="pl custom" 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">$ (4,526,641)<span></span>
</td>
<td class="num">$ (4,643,919)<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_EarningsPerShareAbstract', window );"><strong>Per share information:</strong></a></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_us-gaap_EarningsPerShareBasic', window );">Net loss per share of common stock, basic and diluted (in dollars per share)</a></td>
<td class="num">$ (2.22)<span></span>
</td>
<td class="num">$ (2.81)<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_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic', window );">Weighted average shares outstanding, basic and diluted (in shares)</a></td>
<td class="nump">2,038,323<span></span>
</td>
<td class="nump">1,649,969<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_ComprehensiveIncomeNetOfTaxAbstract', window );"><strong>Comprehensive loss:</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_us-gaap_NetIncomeLoss', window );">Net loss</a></td>
<td class="num">$ (4,526,641)<span></span>
</td>
<td class="num">$ (4,643,919)<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_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax', window );">Unrealized loss on marketable securities</a></td>
<td class="num">(49,658)<span></span>
</td>
<td class="nump">0<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_us-gaap_ComprehensiveIncomeNetOfTax', window );">Comprehensive loss</a></td>
<td class="num">$ (4,576,299)<span></span>
</td>
<td class="num">$ (4,643,919)<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 https://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 https://asc.fasb.org/extlink&amp;oid=126953954&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 https://asc.fasb.org/extlink&amp;oid=126968391&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 https://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 https://asc.fasb.org/extlink&amp;oid=126968391&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 https://asc.fasb.org/extlink&amp;oid=126968391&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_ComprehensiveIncomeNetOfTaxAbstract">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.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_ComprehensiveIncomeNetOfTaxAbstract</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_DepreciationNonproduction">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></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 expense recognized in the current period that allocates the cost of nonproduction tangible assets over their useful 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 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 28<br> -Subparagraph (b)<br> -URI https://asc.fasb.org/extlink&amp;oid=126954810&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 50<br> -Paragraph 1<br> -Subparagraph (a)<br> -URI https://asc.fasb.org/extlink&amp;oid=6391035&amp;loc=d3e2868-110229<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_DepreciationNonproduction</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>
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<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>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_EarningsPerShareBasic">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></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 (loss) for the period per each share of common stock or unit 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/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 815<br> -SubTopic 40<br> -Section 65<br> -Paragraph 1<br> -Subparagraph (e)(4)<br> -URI https://asc.fasb.org/extlink&amp;oid=126732423&amp;loc=SL123482106-238011<br><br>Reference 2: 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 3<br> -URI https://asc.fasb.org/extlink&amp;oid=124431687&amp;loc=d3e22583-107794<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 11<br> -Subparagraph (b)<br> -URI https://asc.fasb.org/extlink&amp;oid=124431687&amp;loc=d3e22694-107794<br><br>Reference 4: 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-SubTopic 10<br> -Section S99<br> -Paragraph 2<br> -Subparagraph (SX 210.5-03(25))<br> -URI https://asc.fasb.org/extlink&amp;oid=126953954&amp;loc=SL114868664-224227<br><br>Reference 15: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 260<br> -SubTopic 10<br> -Section 45<br> -Paragraph 2<br> -URI https://asc.fasb.org/extlink&amp;oid=126958026&amp;loc=d3e1252-109256<br><br>Reference 16: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 260<br> -SubTopic 10<br> -Section 45<br> -Paragraph 60B<br> -Subparagraph (d)<br> -URI https://asc.fasb.org/extlink&amp;oid=126958026&amp;loc=SL5780133-109256<br><br>Reference 17: 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(27))<br> -URI https://asc.fasb.org/extlink&amp;oid=120399700&amp;loc=SL114874048-224260<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_EarningsPerShareBasic</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 https://asc.fasb.org/extlink&amp;oid=126953954&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_InterestIncomeExpenseNonoperatingNet">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></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 amount of nonoperating interest income (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_InterestIncomeExpenseNonoperatingNet</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 https://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 https://asc.fasb.org/extlink&amp;oid=126901519&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_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 https://asc.fasb.org/extlink&amp;oid=126901519&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 https://asc.fasb.org/extlink&amp;oid=126901519&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 https://asc.fasb.org/extlink&amp;oid=126901519&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 https://asc.fasb.org/extlink&amp;oid=126901519&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 https://asc.fasb.org/extlink&amp;oid=126901519&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_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 https://asc.fasb.org/extlink&amp;oid=126968391&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 https://asc.fasb.org/extlink&amp;oid=126968391&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">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax</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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<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_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 https://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 https://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 https://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>
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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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<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
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<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_WeightedAverageNumberOfSharesOutstandingBasic">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></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 [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that 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/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 (a)<br> -URI https://asc.fasb.org/extlink&amp;oid=124432515&amp;loc=d3e3550-109257<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 45<br> -Paragraph 10<br> -URI https://asc.fasb.org/extlink&amp;oid=126958026&amp;loc=d3e1448-109256<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_WeightedAverageNumberOfSharesOutstandingBasic</td>
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<tr>
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<td>us-gaap_</td>
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<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
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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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<span style="display: none;">v3.22.1</span><table class="report" border="0" cellspacing="2" id="idm140295878558568">
<tr>
<th class="tl" colspan="1" rowspan="1"><div style="width: 200px;"><strong>Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)<br></strong></div></th>
<th class="th"><div>Total</div></th>
<th class="th"><div>Common Stock [Member]</div></th>
<th class="th"><div>Additional Paid-in Capital [Member]</div></th>
<th class="th"><div>Retained Earnings [Member]</div></th>
<th class="th"><div>Preferred Stock [Member]</div></th>
<th class="th"><div>AOCI Attributable to Parent [Member]</div></th>
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<tr class="rc">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SharesOutstanding', window );">Balance (in shares) at Dec. 31, 2020</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">1,280,207<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rc">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockholdersEquity', window );">Balance at Dec. 31, 2020</a></td>
<td class="nump">$ 24,814,182<span></span>
</td>
<td class="nump">$ 1,280<span></span>
</td>
<td class="nump">$ 130,722,286<span></span>
</td>
<td class="num">$ (105,909,384)<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_us-gaap_StockIssuedDuringPeriodSharesNewIssues', window );">Sale of common stock (in shares)</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">673,171<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<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_us-gaap_StockIssuedDuringPeriodValueNewIssues', window );">Sale of common stock</a></td>
<td class="nump">31,094,302<span></span>
</td>
<td class="nump">$ 673<span></span>
</td>
<td class="nump">31,093,629<span></span>
</td>
<td class="nump">0<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_us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities', window );">Issuance of common stock upon exercise of warrants, net of issuance costs (in shares)</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">84,600<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<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_us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities', window );">Issuance of common stock upon exercise of warrants, net of issuance costs</a></td>
<td class="nump">2,201,450<span></span>
</td>
<td class="nump">$ 85<span></span>
</td>
<td class="nump">2,201,365<span></span>
</td>
<td class="nump">0<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_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue', window );">Stock-based compensation expense</a></td>
<td class="nump">181,280<span></span>
</td>
<td class="nump">0<span></span>
</td>
<td class="nump">181,280<span></span>
</td>
<td class="nump">0<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_us-gaap_NetIncomeLoss', window );">Net loss</a></td>
<td class="num">(4,643,919)<span></span>
</td>
<td class="nump">$ 0<span></span>
</td>
<td class="nump">0<span></span>
</td>
<td class="num">(4,643,919)<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_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax', window );">Unrealized loss on marketable securities</a></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>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rc">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SharesOutstanding', window );">Balance (in shares) at Mar. 31, 2021</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">2,037,978<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<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 custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockholdersEquity', window );">Balance at Mar. 31, 2021</a></td>
<td class="nump">53,647,295<span></span>
</td>
<td class="nump">$ 2,038<span></span>
</td>
<td class="nump">164,198,560<span></span>
</td>
<td class="num">(110,553,303)<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rc">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SharesOutstanding', window );">Balance (in shares) at Dec. 31, 2021</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">2,038,185<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>
</tr>
<tr class="rc">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockholdersEquity', window );">Balance at Dec. 31, 2021</a></td>
<td class="nump">34,911,467<span></span>
</td>
<td class="nump">$ 2,038<span></span>
</td>
<td class="nump">164,914,540<span></span>
</td>
<td class="num">(130,005,111)<span></span>
</td>
<td class="nump">$ 0<span></span>
</td>
<td class="nump">$ 0<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_us-gaap_StockIssuedDuringPeriodSharesNewIssues', window );">Sale of common stock (in shares)</a></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="nump">10,000<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_us-gaap_StockIssuedDuringPeriodValueNewIssues', window );">Sale of common stock</a></td>
<td class="nump">5,000<span></span>
</td>
<td class="nump">$ 0<span></span>
</td>
<td class="nump">0<span></span>
</td>
<td class="nump">0<span></span>
</td>
<td class="nump">$ 5,000<span></span>
</td>
<td class="nump">0<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_us-gaap_NetIncomeLoss', window );">Net loss</a></td>
<td class="num">(4,526,641)<span></span>
</td>
<td class="nump">$ 0<span></span>
</td>
<td class="nump">0<span></span>
</td>
<td class="num">(4,526,641)<span></span>
</td>
<td class="nump">$ 0<span></span>
</td>
<td class="nump">0<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_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures', window );">Stock-based compensation expense and vesting of restricted stock units (in shares)</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">207<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>
</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_us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition', window );">Stock-based compensation expense and vesting of restricted stock units</a></td>
<td class="nump">278,131<span></span>
</td>
<td class="nump">$ 0<span></span>
</td>
<td class="nump">278,131<span></span>
</td>
<td class="nump">0<span></span>
</td>
<td class="nump">$ 0<span></span>
</td>
<td class="nump">0<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_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax', window );">Unrealized loss on marketable securities</a></td>
<td class="num">(49,658)<span></span>
</td>
<td class="nump">$ 0<span></span>
</td>
<td class="nump">0<span></span>
</td>
<td class="nump">0<span></span>
</td>
<td class="nump">$ 0<span></span>
</td>
<td class="num">(49,658)<span></span>
</td>
</tr>
<tr class="rc">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SharesOutstanding', window );">Balance (in shares) at Mar. 31, 2022</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">2,038,392<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">10,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rc">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockholdersEquity', window );">Balance at Mar. 31, 2022</a></td>
<td class="nump">$ 30,618,299<span></span>
</td>
<td class="nump">$ 2,038<span></span>
</td>
<td class="nump">$ 165,192,671<span></span>
</td>
<td class="num">$ (134,531,752)<span></span>
</td>
<td class="nump">$ 5,000<span></span>
</td>
<td class="num">$ (49,658)<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_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></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 restricted stock unit under share-based payment arrangement.</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_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition</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_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 https://asc.fasb.org/extlink&amp;oid=126964447&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 20<br> -Section 55<br> -Paragraph 13<br> -URI https://asc.fasb.org/extlink&amp;oid=126964447&amp;loc=d3e11178-113907<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 35<br> -Paragraph 2<br> -URI https://asc.fasb.org/extlink&amp;oid=126961718&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>
<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 https://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 https://asc.fasb.org/extlink&amp;oid=126901519&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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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 https://asc.fasb.org/extlink&amp;oid=126975872&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 https://asc.fasb.org/extlink&amp;oid=126901519&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 https://asc.fasb.org/extlink&amp;oid=126901519&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_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 https://asc.fasb.org/extlink&amp;oid=126968391&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 https://asc.fasb.org/extlink&amp;oid=126968391&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">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax</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_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></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 during the period as a result of the conversion of convertible 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 505<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.3-04)<br> -URI https://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 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.29-30)<br> -URI https://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<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 1E<br> -Subparagraph (c)<br> -URI https://asc.fasb.org/extlink&amp;oid=123466505&amp;loc=SL123495348-112611<br><br>Reference 4: 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 https://asc.fasb.org/extlink&amp;oid=126973232&amp;loc=d3e21475-112644<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 https://asc.fasb.org/extlink&amp;oid=126973232&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_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities</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_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 https://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 https://asc.fasb.org/extlink&amp;oid=126973232&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 https://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 https://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>
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<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
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<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
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<td><strong> Period Type:</strong></td>
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</div></td></tr>
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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>Number of shares issued during the period related to Restricted Stock Awards, net of any shares forfeited.</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 https://asc.fasb.org/extlink&amp;oid=126973232&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 505<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.3-04)<br> -URI https://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 https://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 https://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_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures</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:sharesItemType</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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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></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 gross value of stock issued during the period upon the conversion of convertible 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 505<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -URI https://asc.fasb.org/extlink&amp;oid=126973232&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 505<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.3-04)<br> -URI https://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 210.5-02.29-31)<br> -URI https://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_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities</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>
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<td><strong> Balance Type:</strong></td>
<td>credit</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_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 https://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 https://asc.fasb.org/extlink&amp;oid=126973232&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 https://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 https://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>
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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>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_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 https://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 https://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 https://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 https://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 https://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 https://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 https://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 https://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>
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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><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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<span style="display: none;">v3.22.1</span><table class="report" border="0" cellspacing="2" id="idm140295877977864">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Consolidated Statements of Cash Flows (Unaudited) - USD ($)<br></strong></div></th>
<th class="th" colspan="2">3 Months Ended</th>
</tr>
<tr>
<th class="th"><div>Mar. 31, 2022</div></th>
<th class="th"><div>Mar. 31, 2021</div></th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract', window );"><strong>Operating activities:</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
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<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_NetIncomeLoss', window );">Net loss</a></td>
<td class="num">$ (4,526,641)<span></span>
</td>
<td class="num">$ (4,643,919)<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_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract', 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>
</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_us-gaap_Depreciation', window );">Depreciation</a></td>
<td class="nump">0<span></span>
</td>
<td class="nump">24,447<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_us-gaap_ShareBasedCompensation', window );">Stock-based compensation expense</a></td>
<td class="nump">278,131<span></span>
</td>
<td class="nump">181,280<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_us-gaap_InvestmentIncomeNetAmortizationOfDiscountAndPremium', window );">Amortization of premium and discount on marketable securities</a></td>
<td class="num">(13,546)<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_IncreaseDecreaseInOperatingCapitalAbstract', window );"><strong>Changes in operating assets and liabilities:</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_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets', window );">Prepaid expenses, deposits and other assets</a></td>
<td class="num">(495,903)<span></span>
</td>
<td class="num">(417,677)<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_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities', window );">Accounts payable, accrued expenses and other liabilities</a></td>
<td class="nump">28,146<span></span>
</td>
<td class="num">(320,501)<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_us-gaap_NetCashProvidedByUsedInOperatingActivities', window );">Net cash used in operating activities</a></td>
<td class="num">(4,729,813)<span></span>
</td>
<td class="num">(5,176,370)<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 used in investing activities:</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_us-gaap_PaymentsToAcquireMarketableSecurities', window );">Purchases of marketable securities</a></td>
<td class="num">(22,716,415)<span></span>
</td>
<td class="nump">0<span></span>
</td>
</tr>
<tr class="reu">
<td class="pl custom" 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 investing activities</a></td>
<td class="num">(22,716,415)<span></span>
</td>
<td class="nump">0<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_us-gaap_ProceedsFromIssuanceOfCommonStock', window );">Proceeds from the sale of common stock, net of issuance costs</a></td>
<td class="nump">0<span></span>
</td>
<td class="nump">31,094,302<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_us-gaap_ProceedsFromWarrantExercises', window );">Proceeds received from the exercise of common stock warrants</a></td>
<td class="nump">0<span></span>
</td>
<td class="nump">2,201,450<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_us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock', window );">Proceeds from the sale of series C preferred stock to related parties</a></td>
<td class="nump">5,000<span></span>
</td>
<td class="nump">0<span></span>
</td>
</tr>
<tr class="reu">
<td class="pl custom" 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="nump">5,000<span></span>
</td>
<td class="nump">33,295,752<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_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect', window );">Net (decrease) increase in cash and cash equivalents</a></td>
<td class="num">(27,441,228)<span></span>
</td>
<td class="nump">28,119,382<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_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations', window );">Cash and cash equivalents at beginning of year</a></td>
<td class="nump">37,313,558<span></span>
</td>
<td class="nump">18,515,595<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_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations', window );">Cash and cash equivalents at end of period</a></td>
<td class="nump">9,872,330<span></span>
</td>
<td class="nump">46,634,977<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_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract', window );"><strong>Supplemental disclosure of non-cash activities:</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_us-gaap_MarketableSecuritiesUnrealizedGainLoss', window );">Unrealized loss on marketable securities</a></td>
<td class="nump">$ 49,658<span></span>
</td>
<td class="nump">$ 0<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_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.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_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract</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 https://asc.fasb.org/extlink&amp;oid=126999549&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 https://asc.fasb.org/extlink&amp;oid=126954810&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 https://asc.fasb.org/extlink&amp;oid=126954810&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 https://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 https://asc.fasb.org/extlink&amp;oid=126954810&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_Depreciation">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></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 expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.</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 360<br> -SubTopic 10<br> -Section 50<br> -Paragraph 1<br> -Subparagraph (a)<br> -URI https://asc.fasb.org/extlink&amp;oid=6391035&amp;loc=d3e2868-110229<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 https://asc.fasb.org/extlink&amp;oid=126954810&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_Depreciation</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 https://asc.fasb.org/extlink&amp;oid=126954810&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_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 https://asc.fasb.org/extlink&amp;oid=126954810&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_InvestmentIncomeNetAmortizationOfDiscountAndPremium">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></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 accretion (amortization) of purchase discount (premium) 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 210.5-03.8)<br> -URI https://asc.fasb.org/extlink&amp;oid=126953954&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_InvestmentIncomeNetAmortizationOfDiscountAndPremium</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_MarketableSecuritiesUnrealizedGainLoss">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></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 unrealized gain (loss) on investment in marketable security.</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)(c))<br> -URI https://asc.fasb.org/extlink&amp;oid=126953954&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_MarketableSecuritiesUnrealizedGainLoss</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 https://asc.fasb.org/extlink&amp;oid=126954810&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_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 https://asc.fasb.org/extlink&amp;oid=126954810&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 https://asc.fasb.org/extlink&amp;oid=126954810&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 https://asc.fasb.org/extlink&amp;oid=126954810&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 https://asc.fasb.org/extlink&amp;oid=126954810&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>
</tr>
<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 https://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 https://asc.fasb.org/extlink&amp;oid=126901519&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_PaymentsToAcquireMarketableSecurities">
<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 );">- Definition</a><div><p>Amount of cash outflow for purchase of marketable security.</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 320<br> -SubTopic 10<br> -Section 45<br> -Paragraph 11<br> -URI https://asc.fasb.org/extlink&amp;oid=124260329&amp;loc=d3e26853-111562<br></p></div>
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<span style="display: none;">v3.22.1</span><table class="report" border="0" cellspacing="2" id="idm140295880812792">
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<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Note 1 - Organization and Description of Business<br></strong></div></th>
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   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">Diffusion Pharmaceuticals Inc., a Delaware corporation, is a biopharmaceutical company developing novel therapies that enhance the body&#8217;s ability to deliver oxygen to areas where it is needed most. The Company&#8217;s lead product candidate, TSC, is being developed to enhance the diffusion of oxygen to tissues with low oxygen levels, also known as hypoxia, a serious complication of many of medicine&#8217;s most intractable and difficult-to-treat conditions, including hypoxic tumors.</p>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The entire disclosure for the nature of an entity's business, major products or services, principal markets including location, and the relative importance of its operations in each business and the basis for the determination, including but not limited to, assets, revenues, or earnings. For an entity that has not commenced principal operations, disclosures about the risks and uncertainties related to the activities in which the entity is currently engaged and an understanding of what those activities are being directed toward.</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 275<br> -SubTopic 10<br> -Section 50<br> -Paragraph 1<br> -Subparagraph (a)<br> -URI https://asc.fasb.org/extlink&amp;oid=99393423&amp;loc=d3e5967-108592<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 275<br> -URI https://asc.fasb.org/topic&amp;trid=2134479<br></p></div>
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<span style="display: none;">v3.22.1</span><table class="report" border="0" cellspacing="2" id="idm140295880856632">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Note 2 - Liquidity<br></strong></div></th>
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<span style="display: none;">v3.22.1</span><table class="report" border="0" cellspacing="2" id="idm140295880869400">
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<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Note 3 - Basis of Presentation and Summary of Significant Accounting Policies<br></strong></div></th>
<th class="th" colspan="1">3 Months Ended</th>
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<tr><th class="th"><div>Mar. 31, 2022</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_DisclosureTextBlockAbstract', window );"><strong>Notes to Financial Statements</strong></a></td>
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<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SignificantAccountingPoliciesTextBlock', window );">Significant Accounting Policies [Text Block]</a></td>
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   <table border="0" cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;width:100%;margin-left:auto;margin-right:auto;"><tbody><tr><td style="vertical-align:top;width:9%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;"><b><em style="font: inherit;">3.</em></b></p> </td><td style="vertical-align:top;width:91.5%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;"><b>Basis of Presentation and Summary of Significant Accounting Policies</b></p> </td></tr>
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   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">As of the date of this Quarterly Report, the Summary of Significant Accounting Policies included in the Company's Annual Report have <em style="font: inherit;">not</em> materially changed, except as set forth below.</p>
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   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">The accompanying unaudited interim&#160;consolidated&#160;financial statements of the Company have been prepared in accordance with GAAP for interim financial information as found in the ASC and ASUs of the FASB, and with the instructions to Form <em style="font: inherit;">10</em>-Q and Article <em style="font: inherit;">10</em> of Regulation S-<em style="font: inherit;">X</em> promulgated by the SEC. In the opinion of management, the accompanying&#160;unaudited interim consolidated financial statements of the Company include all normal and recurring adjustments (which consist primarily of accruals, estimates and assumptions that impact the unaudited interim consolidated financial statements) considered necessary to present fairly the Company&#8217;s financial position as of&#160;<em style="font: inherit;"> March&#160;</em><em style="font: inherit;">31,</em> <em style="font: inherit;">2022,</em> and its results of operations and cash flows for the <em style="font: inherit;">three</em> months ended <em style="font: inherit;"> March&#160;</em><em style="font: inherit;">31,</em> <em style="font: inherit;">2022</em> and <em style="font: inherit;">2021.</em> Operating results for the <em style="font: inherit;">three</em> months ended&#160;<em style="font: inherit;"> March&#160;</em><em style="font: inherit;">31,</em> <em style="font: inherit;">2022</em> are <em style="font: inherit;">not</em> necessarily indicative of the results that <em style="font: inherit;"> may </em>be expected for the year ending <em style="font: inherit;"> December&#160;</em><em style="font: inherit;">31,</em> <em style="font: inherit;">2022.</em> The unaudited interim&#160;consolidated&#160;financial statements presented herein do <em style="font: inherit;">not</em> contain the required disclosures under GAAP for annual financial statements. The accompanying&#160;unaudited interim consolidated&#160;financial statements should be read in conjunction with the annual audited financial statements and related notes as of and for the year ended <em style="font: inherit;"> December&#160;</em><em style="font: inherit;">31,</em> <em style="font: inherit;">2021</em> filed with the SEC as part of the Annual Report.</p>
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   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 9pt;"><i/></p><p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 9pt;"><i>Use of Estimates</i></p>
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   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">The preparation of financial statements in conformity with GAAP requires the Company to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of expenses during the reporting period.</p>
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   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">On an ongoing basis, the Company evaluates its estimates using historical experience and other factors, including the current economic environment. Significant items subject to such estimates are assumptions used for purposes of determining stock-based compensation and accounting for research and development activities. Management believes its estimates to be reasonable under the circumstances. Actual results could differ significantly from those estimates.</p>
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   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 9pt;"><i/></p><p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 9pt;"><i>Fair Value of Financial Instruments</i></p>
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   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">The carrying amounts of the Company&#8217;s financial instruments, including cash equivalents and accounts payable approximate fair value due to the short-term nature of those instruments.&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;</p>
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   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 9pt;"><i/></p><p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 9pt;"><i>Concentration of Credit Risk</i></p>
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   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">Financial instruments that potentially expose the Company to concentrations of credit risk consist principally of cash on deposit with multiple financial institutions, the balances of which frequently exceed federally insured limits.</p>
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   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 9pt;"><i/></p><p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 9pt;"><i>Cash and Cash Equivalents</i></p>
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   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">The Company considers any highly-liquid investments, such as money market funds and commercial paper with an original maturity of <em style="font: inherit;">three</em> months or less to be cash and cash equivalents.</p>
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   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 9pt;"><i/></p><p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 9pt;"><i>Marketable securities</i></p>
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   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">The Company classifies its marketable securities as available-for-sale, which include commercial paper and U.S. government debt securities with original maturities of greater than <em style="font: inherit;">three</em> months from date of purchase. The Company considers its marketable securities as available for use in current operations, and therefore classify these securities as current assets on the consolidated balance sheet. These securities are carried at fair market value, with unrealized gains and losses reported in comprehensive loss and accumulated other comprehensive loss within stockholders&#8217; equity. Gains or losses on marketable securities sold will be based on the specific identification method.</p>
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   <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt;"><i/></p><p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt;"><i>Reverse Stock Split</i></p>
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   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">On <em style="font: inherit;"> April 18, 2022, </em>the Company filed a Certificate of Amendment to its Certificate of Incorporation, as amended, with the Secretary of State of the State of Delaware to effect the Reverse Stock Split at a ratio of <em style="font: inherit;">1</em>-to-50. No fractional shares were issued in connection with the Reverse Stock Split. Stockholders who otherwise would have been entitled to receive fractional shares of common stock are entitled to receive an amount in cash (without interest or deduction) equal to the fraction of <em style="font: inherit;">one</em> share to which such stockholder would otherwise be entitled multiplied by $12.93, representing the split-adjusted average closing price of the Company&#8217;s common stock on the Nasdaq Capital Market for the <em style="font: inherit;">five</em> consecutive trading days immediately preceding the effective date of the Reverse Stock Split. Proportional adjustments were made to the Company&#8217;s outstanding warrants, stock options and other equity securities and to the <em style="font: inherit;">2015</em> Equity Plan to reflect the Reverse Stock Split, in each case, in accordance with the terms thereof. Unless the context otherwise requires, all share and per share amounts in this Quarterly Report have been adjusted to reflect the Reverse Stock Split.</p>
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   <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt;"><i/></p><p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt;"><i>Net Loss Per Common Share</i></p>
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   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">Basic net loss per share is computed by dividing net loss attributable to common stockholders by the weighted average number of shares of common stock outstanding during each period. Diluted net loss per share includes the effect, if any, from the potential exercise or conversion of securities, such as convertible debt, convertible preferred stock, common stock warrants, stock options and unvested restricted stock that would result in the issuance of incremental shares of common stock. In computing the basic and diluted net loss per share applicable to common stockholders, the weighted average number of shares remains the same for both calculations due to the fact that when a net loss exists, dilutive shares are <em style="font: inherit;">not</em> included in the calculation as the impact is anti-dilutive.</p>
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   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">The following potentially dilutive securities outstanding as of <em style="font: inherit;"> March&#160;</em><em style="font: inherit;">31,</em> <em style="font: inherit;">2022</em> and <em style="font: inherit;">2021</em> have been excluded from the computation of diluted weighted average shares outstanding, as they would be anti-dilutive:</p>
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<tr style="vertical-align: bottom;"><td style="font-family: Times New Roman; font-size: 10pt;">&#160;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#160;</td><td colspan="2" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b><b>2022</b></b></p> </td><td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px;">&#160;</td><td style="font-family: Times New Roman; font-size: 10pt;">&#160;</td><td colspan="2" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b><b>2021</b></b></p> </td><td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px;">&#160;</td></tr>
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   <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#160;</p><p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"/>
   <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt;"><b><i/></b></p><p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt;"><b><i>Recently Adopted Accounting Pronouncements</i></b></p>
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   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">In <em style="font: inherit;"> June 2016, </em>the FASB issued ASU <em style="font: inherit;">2016</em>-<em style="font: inherit;">13,</em> <i>Financial Instruments</i>&#8212;<i>Credit Losses, Measurement of Credit Losses on Financial Instruments</i> (Topic <em style="font: inherit;">326</em>). The standard amends the impairment model by requiring entities to use a forward-looking approach based on expected losses to estimate credit losses for most financial assets and certain other instruments that aren&#8217;t measured at fair value through net income. For available-for-sale debt securities, entities will be required to recognize an allowance for credit losses rather than a reduction in carrying value of the asset. Entities will <em style="font: inherit;">no</em> longer be permitted to consider the length of time that fair value has been less than amortized cost when evaluating when credit losses should be recognized. This new guidance is effective for the Company as of <em style="font: inherit;"> January 1, 2023. </em>The Company is currently evaluating the impact of this ASU but&#160;does&#160;<em style="font: inherit;">not</em>&#160;expect that adoption of this standard will have a material impact on the consolidated financial statements and related disclosures.</p>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The entire disclosure for all significant accounting policies of the reporting entity.</p></div>
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<span style="display: none;">v3.22.1</span><table class="report" border="0" cellspacing="2" id="idm140295880853320">
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<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Note 4 - Cash, Cash Equivalents and Marketable Securities<br></strong></div></th>
<th class="th" colspan="1">3 Months Ended</th>
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<tr><th class="th"><div>Mar. 31, 2022</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_DisclosureTextBlockAbstract', window );"><strong>Notes to Financial Statements</strong></a></td>
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<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CashCashEquivalentsAndMarketableSecuritiesTextBlock', window );">Cash, Cash Equivalents, and Marketable Securities [Text Block]</a></td>
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   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin: 0pt;">&#160;</p>
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<tr style="vertical-align: bottom;"><td style="width: 66%;">&#160;</td><td style="width: 1%;">&#160;</td><td style="width: 1%;">&#160;</td><td style="width: 14%;">&#160;</td><td style="width: 1%;">&#160;</td><td style="width: 1%;">&#160;</td><td style="width: 1%;">&#160;</td><td style="width: 14%;">&#160;</td><td style="width: 1%;">&#160;</td></tr>
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    <p style="margin: 0pt;">&#160;</p>

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   <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#160;</p>

    <table border="0" cellpadding="0" cellspacing="0" class="finTable" style="width: 100%; font-size: 10pt; font-family: Times New Roman; text-indent: 0px;"><tbody><tr style="vertical-align: bottom;"><td style="font-family: Times New Roman; font-size: 10pt; width: 32%;">&#160;</td><td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; width: 1%;">&#160;</td><td colspan="2" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0); width: 1%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;">Amortized cost</p> </td><td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; width: 1%;">&#160;</td><td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; width: 1%;">&#160;</td><td colspan="2" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0); width: 1%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;">Unrealized gains</p> </td><td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; width: 1%;">&#160;</td><td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; width: 1%;">&#160;</td><td colspan="2" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0); width: 1%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;">Unrealized losses</p> </td><td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; width: 1%;">&#160;</td><td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; width: 1%;">&#160;</td><td colspan="2" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0); width: 1%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;">Fair Value</p> </td><td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; width: 1%;">&#160;</td></tr>
<tr style="vertical-align: bottom;"><td style="width: 32%;">&#160;</td><td style="width: 1%;">&#160;</td><td style="width: 1%;">&#160;</td><td style="width: 14%;">&#160;</td><td style="width: 1%;">&#160;</td><td style="width: 1%;">&#160;</td><td style="width: 1%;">&#160;</td><td style="width: 14%;">&#160;</td><td style="width: 1%;">&#160;</td><td style="width: 1%;">&#160;</td><td style="width: 1%;">&#160;</td><td style="width: 14%;">&#160;</td><td style="width: 1%;">&#160;</td><td style="width: 1%;">&#160;</td><td style="width: 1%;">&#160;</td><td style="width: 14%;">&#160;</td><td style="width: 1%;">&#160;</td></tr>
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   <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#160;</p>
   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">The Company did <span style="-sec-ix-hidden:c84240720">not</span> have marketable securities as of <em style="font: inherit;"> December 31, 2021. </em>The Company's marketable securities generally have contractual maturity dates between 3 and 12 months. Most of the Company&#8217;s marketable securities are in an unrealized loss position at <em style="font: inherit;"> March 31, 2022. </em>Unrealized losses on marketable securities as of <em style="font: inherit;"> March 31, 2022 </em>were <em style="font: inherit;">not</em> significant and were primarily due to changes in interest rates, and <em style="font: inherit;">not</em> due to increased credit risks associated with specific securities. Accordingly, no other-than-temporary impairment was recorded for the <em style="font: inherit;">three</em> months ended <em style="font: inherit;"> March 31, 2022 </em>and there were no realized gains or losses recorded during the <em style="font: inherit;">three</em> months ended <em style="font: inherit;"> March 31, 2022.</em></p>
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<span style="display: none;">v3.22.1</span><table class="report" border="0" cellspacing="2" id="idm140295881485768">
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<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Note 5 - Fair Value of Financial Instruments<br></strong></div></th>
<th class="th" colspan="1">3 Months Ended</th>
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<tr><th class="th"><div>Mar. 31, 2022</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_DisclosureTextBlockAbstract', window );"><strong>Notes to Financial Statements</strong></a></td>
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<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_FairValueDisclosuresTextBlock', window );">Fair Value Disclosures [Text Block]</a></td>
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   <table border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt; font-family: &quot;Times New Roman&quot;, Times, serif; width: 100%;"><tbody><tr><td style="width: 9%;"><b><em style="font: inherit;">5.</em></b></td><td style="width: 91%;"><b>Fair Value of Financial Instruments</b></td></tr>
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   <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">&#160;</p>
   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">Fair value is the price that could be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. Fair value determination in accordance with applicable accounting guidance requires that a number of significant judgments be made. Additionally, fair value is used on a nonrecurring basis to evaluate assets for impairment or as required for disclosure purposes by applicable accounting guidance on disclosures about fair value of financial instruments. Depending on the nature of the assets and liabilities, various valuation techniques and assumptions are used when estimating fair value. The carrying amounts of certain of the Company&#8217;s financial instruments, including prepaid expense and accounts payable are shown at cost, which approximates fair value due to the short-term nature of these instruments. The Company follows the provisions of FASB ASC Topic <em style="font: inherit;">820,</em> <i>Fair Value Measurement</i>, for financial assets and liabilities measured on a recurring basis. The guidance requires fair value measurements be classified and disclosed in <em style="font: inherit;">one</em> of the following <em style="font: inherit;">three</em> categories:</p>
   <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#160;</p>
   <table border="0" cellpadding="0" cellspacing="0" style="width:100%;font-family:Times New Roman;font-size:10pt;"><tbody><tr><td style="width:18pt;">&#160;</td><td style="vertical-align:top;width:18pt;"> <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#8226;</p> </td><td style="vertical-align:top;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">Level <em style="font: inherit;">1:</em> Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities.</p> </td></tr>
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   <table border="0" cellpadding="0" cellspacing="0" style="width:100%;font-family:Times New Roman;font-size:10pt;"><tbody><tr><td style="width:18pt;">&#160;</td><td style="vertical-align:top;width:18pt;"> <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#8226;</p> </td><td style="vertical-align:top;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">Level <em style="font: inherit;">3:</em> Prices or valuation techniques that require inputs that are both significant to the fair value measurement and unobservable (i.e., supported by little or <em style="font: inherit;">no</em> market activity).</p> </td></tr>
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   <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#160;</p>
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<span style="display: none;">v3.22.1</span><table class="report" border="0" cellspacing="2" id="idm140295880857464">
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<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Note 6 - Accrued Expenses and Other Current Liabilities<br></strong></div></th>
<th class="th" colspan="1">3 Months Ended</th>
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<span style="display: none;">v3.22.1</span><table class="report" border="0" cellspacing="2" id="idm140295881476040">
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<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Note 7 - Stockholders' Equity and Common Stock Warrants<br></strong></div></th>
<th class="th" colspan="1">3 Months Ended</th>
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<tr><th class="th"><div>Mar. 31, 2022</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_DisclosureTextBlockAbstract', window );"><strong>Notes to Financial Statements</strong></a></td>
<td class="text">&#160;<span></span>
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<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockholdersEquityNoteDisclosureTextBlock', window );">Stockholders' Equity Note Disclosure [Text Block]</a></td>
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   <table border="0" cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;width:100%;margin-left:auto;margin-right:auto;"><tbody><tr><td style="vertical-align:top;width:9%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;"><b><em style="font: inherit;">7.</em></b></p> </td><td style="vertical-align: top; width: 91%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;"><b>Stockholders' Equity and Common Stock Warrants</b></p> </td></tr>
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   <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#160;</p>
   <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt;"><i>Private Placement of Series C Preferred Stock</i></p>
   <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#160;</p>
   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">On <em style="font: inherit;"> March 18, 2022, </em>the Company issued and sold to Robert J. Cobuzzi, Jr., Ph.D., its President &amp; Chief Executive Officer, and William R. Elder, its General Counsel &amp; Corporate Secretary, an aggregate of 10,000 shares of Series C Preferred Stock at an offering price of $0.50 per share, representing <em style="font: inherit;">100%</em> of the stated value per share of the Series C Preferred Stock, for aggregate gross proceeds of <span style="-sec-ix-hidden:c84240794">$5,000.</span></p>
   <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#160;</p>
   <p style="font-family: 'Times New Roman', Times, serif; font-size: 10pt; margin: 0pt; text-align: left"/>
   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">The Series C Certificate provides that, among other things, (i) each share of Series C Preferred Stock is convertible into 0.02 shares of the Company's common stock, representing a conversion price of $25.00 per share, subject to certain conditions, (ii) each share of Series C Preferred Stock outstanding is counted on an as converted basis, together with the Company&#8217;s common stock as a single class, for purposes of determining the presence of a quorum at any meeting at which holders are asked to vote on matters related to the Reverse Stock Split (subject to any applicable exchange listing rules), (iii) each share of Series C Preferred Stock outstanding has the right to cast <em style="font: inherit;">1,600</em> votes per share of Series C Preferred Stock on the Reverse Stock Split on a &#8220;mirrored&#8221; basis &#8212; this means that the holders of the Series C Preferred Stock are required to vote their shares in a manner that &#8220;mirrors&#8221; the proportions of &#8220;For&#8221; and &#8220;Against&#8221; votes cast by the holders of the Company&#8217;s common stock are voted on the Amendment (excluding, for the avoidance of doubt, any shares of common stock that are <em style="font: inherit;">not</em> voted), and (iv) the holders of outstanding shares of Series C Preferred Stock are entitled to dividends, on an as converted basis, equal to dividends actually paid, if any, on shares of common stock and participate in any liquidation of the Company on an as converted basis.</p>
   <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#160;</p>
   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">On <em style="font: inherit;"> April 18, 2022, </em>following approval of the Reverse Stock Split by the Company's stockholders, all 10,000 shares of Series C Preferred Stock were converted into an aggregate of 200 shares of the Company's common stock in accordance with the terms of the Series C Certificate.</p>
   <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#160;</p>
   <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt;"><i>Common Stock Warrants</i></p>
   <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#160;</p>
   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">During its evaluation of equity classification for the Company's common stock warrants issued in previous periods, the Company considered the conditions as prescribed within ASC <em style="font: inherit;">815</em>-<em style="font: inherit;">40,</em><i> Derivatives and Hedging</i>, <i>Contracts in an Entity</i>&#8217;<i>s own Equity</i>. The conditions within ASC <em style="font: inherit;">815</em>-<em style="font: inherit;">40</em> are <em style="font: inherit;">not</em> subject to a probability assessment. The warrants do <em style="font: inherit;">not</em> fall under the liability criteria within ASC <em style="font: inherit;">480</em> <i>Distinguishing Liabilities from Equity</i> as they are <em style="font: inherit;">not</em> puttable and do <em style="font: inherit;">not</em> represent an instrument that has a redeemable underlying security. The warrants do meet the definition of a derivative instrument under ASC <em style="font: inherit;">815,</em> but are eligible for the scope exception as they are indexed to the Company&#8217;s own stock and would be classified in permanent equity if freestanding.</p>
   <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#160;</p>
   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">As of <em style="font: inherit;"> March&#160;</em><em style="font: inherit;">31,</em> <em style="font: inherit;">2022,</em> the Company had the following warrants outstanding to acquire shares of its common stock:</p>
   <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt;text-indent:36pt;">&#160;</p>

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   <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#160;</p>
   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin: 0pt; text-indent: 45pt; text-align: justify;">During the <em style="font: inherit;">three</em> months ended <em style="font: inherit;"> March&#160;</em><em style="font: inherit;">31,</em> <em style="font: inherit;">2022,</em> 18,077 warrants expired.</p>
   <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#160;</p>
   <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt 0pt 0pt 8pt;"><b/></p>
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<span style="display: none;">v3.22.1</span><table class="report" border="0" cellspacing="2" id="idm140295880807032">
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<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Note 8 - Stock-based Compensation<br></strong></div></th>
<th class="th" colspan="1">3 Months Ended</th>
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   <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#160;</p>
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   <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#160;</p>
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   <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#160;</p>
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   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">&#160;</p>
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   <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#160;</p>

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<span style="display: none;">v3.22.1</span><table class="report" border="0" cellspacing="2" id="idm140295880847144">
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<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Note 9 - Commitments and Contingencies<br></strong></div></th>
<th class="th" colspan="1">3 Months Ended</th>
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<tr><th class="th"><div>Mar. 31, 2022</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_DisclosureTextBlockAbstract', window );"><strong>Notes to Financial Statements</strong></a></td>
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   <table border="0" cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;width:100%;margin-left:auto;margin-right:auto;"><tbody><tr><td style="vertical-align:top;width:9%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;"><b><em style="font: inherit;">9.</em></b></p> </td><td style="vertical-align:top;width:91.6%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;"><b>Commitments and Contingencies</b></p> </td></tr>
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   <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#160;</p>
   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin: 0pt; text-indent: 9pt;"><i>Office Space Lease Commitment</i></p>
   <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#160;</p>
   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">The Company has short term agreements to utilize membership-based co-working space in both Charlottesville, Virginia and Philadelphia, Pennsylvania. Rent expense related to the Company's short-term agreements was approximately $9,000 and $31,000 for the <em style="font: inherit;">three</em> months ended <em style="font: inherit;"> March&#160;</em><em style="font: inherit;">31,</em> <em style="font: inherit;">2022</em> and <em style="font: inherit;">2021,</em> respectively.</p>
   <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#160;</p>
   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin: 0pt; text-indent: 9pt;"><i>Research and Development Arrangements</i></p>
   <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#160;</p>
   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">In the course of normal business operations, the Company enters into agreements with universities and CROs to assist in the performance of research and development activities and contract manufacturers to assist with chemistry, manufacturing, and controls related expenses. Expenditures to CROs represent a significant cost in clinical development for the Company. The Company could also enter into additional collaborative research, contract research, manufacturing, and supplier agreements in the future, which <em style="font: inherit;"> may </em>require upfront payments and long-term commitments of cash.</p>
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   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin: 0pt; text-indent: 9pt;"><i>Defined Contribution Retirement Plan</i></p>
   <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#160;</p>
   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">The Company has established its <em style="font: inherit;">401</em>(k) Plan, which covers all employees who qualify under the terms of the plan. Eligible employees <em style="font: inherit;"> may </em>elect to contribute to the <em style="font: inherit;">401</em>(k) Plan up to 90% of their compensation, limited by the IRS-imposed maximum. The Company provides a safe harbor match with a maximum amount of 4% of the participant&#8217;s compensation. The Company made matching contributions under the <em style="font: inherit;">401</em>(k) Plan of approximately $27,000 and $16,000 for the <em style="font: inherit;">three</em> months ended <em style="font: inherit;"> March 31, 2022 </em>and <em style="font: inherit;">2021,</em> respectively.</p>
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   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin: 0pt; text-indent: 9pt;"><i>Legal Proceedings</i></p>
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   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">On <em style="font: inherit;"> August 7, 2014, </em>a complaint was filed in the Superior Court of Los Angeles County, California by Paul Feller, the former Chief Executive Officer of the Company&#8217;s legal predecessor under the caption Paul Feller v. RestorGenex Corporation, Pro Sports &amp; Entertainment, Inc., ProElite, Inc. and Stratus Media Group, GmbH (Case <em style="font: inherit;">No.</em> <em style="font: inherit;">BC553996</em>). The complaint asserts various causes of action, including, among other things, promissory fraud, negligent misrepresentation, breach of contract, breach of employment agreement, breach of the covenant of good faith and fair dealing, violations of the California Labor Code and common counts. The plaintiff is seeking, among other things, compensatory damages in an undetermined amount, punitive damages, accrued interest and an award of attorneys&#8217; fees and costs. On <em style="font: inherit;"> December 30, 2014, </em>the Company filed a petition to compel arbitration and a motion to stay the action. On <em style="font: inherit;"> April 1, 2015, </em>the plaintiff filed a petition in opposition to the Company&#8217;s petition to compel arbitration and a motion to stay the action. After a related hearing on <em style="font: inherit;"> April 14, 2015, </em>the court granted the Company&#8217;s petition to compel arbitration and a motion to stay the action. On <em style="font: inherit;"> January 8, 2016, </em>the plaintiff filed an arbitration demand with the American Arbitration Association. On <em style="font: inherit;"> November 19, 2018 </em>at an Order to Show Cause Re Dismissal Hearing, the court found sufficient grounds <em style="font: inherit;">not</em> to dismiss the case and an arbitration hearing was scheduled, originally for <em style="font: inherit;"> November 2020 </em>but later postponed due to the COVID-<em style="font: inherit;">19</em> pandemic and related restrictions on gatherings in the State of California. In addition, following the <em style="font: inherit;"> November 2018 </em>hearing, an automatic stay was placed on the arbitration in connection with the plaintiff filing for personal bankruptcy protection. On <em style="font: inherit;"> October 22, 2021, </em>following a determination by the bankruptcy trustee <em style="font: inherit;">not</em> to pursue the claims and release them back to the plaintiff, the parties entered into a stipulation to abandon arbitration and return the matter to state court. A case management conference was held on <em style="font: inherit;"> February 23, 2022 </em>at which a trial date of <em style="font: inherit;"> May 24, 2023 </em>was set, and the parties have agreed to stipulate to mediation in advance of the trial.</p>
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   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">The Company believes the claims in this matter are without merit and intends to defend itself vigorously. However, at this stage, the Company is unable to predict the outcome and possible loss or range of loss, if any, associated with its resolution or any potential effect the matter <em style="font: inherit;"> may </em>have on the Company&#8217;s financial position. Depending on the outcome or resolution of this matter, it could have a material effect on the Company&#8217;s financial position, results of operations and cash flows.</p>
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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>
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<span style="display: none;">v3.22.1</span><table class="report" border="0" cellspacing="2" id="idm140295880867640">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Note 10 - Subsequent Events<br></strong></div></th>
<th class="th" colspan="1">3 Months Ended</th>
</tr>
<tr><th class="th"><div>Mar. 31, 2022</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_DisclosureTextBlockAbstract', window );"><strong>Notes to Financial Statements</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_us-gaap_SubsequentEventsTextBlock', window );">Subsequent Events [Text Block]</a></td>
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   <table border="0" cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;width:100%;margin-left:auto;margin-right:auto;"><tbody><tr><td style="vertical-align:top;width:9%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;"><b><em style="font: inherit;">10.</em></b></p> </td><td style="vertical-align:top;width:91.6%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;"><b>Subsequent Events</b></p> </td></tr>
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   <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#160;</p>
   <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt;"><i>Special Meeting, Series C Preferred Stock Conversion, Charter Amendment, and Reverse Stock Split</i></p>
   <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt;">&#160;</p>
   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">On <em style="font: inherit;"> April 18, 2022, </em>at the Special Meeting, the Company's stockholders approved an amendment to the Company&#8217;s certificate of incorporation, as amended, to effect a reverse stock split of the Company&#8217;s outstanding shares of common stock by a ratio of any whole number between <em style="font: inherit;">1</em>-for-2 and <em style="font: inherit;">1</em>-for-50, at any time prior to <em style="font: inherit;"> December 31, 2022, </em>the implementation and timing thereof subject to the discretion of the Company&#8217;s board of directors.</p>
   <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#160;</p>
   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">Following the completion of the Special Meeting, in accordance with Section <em style="font: inherit;">8</em>(a) of the Series C Certificate, the Company delivered to the holders of the Series C Preferred Stock written notice of the Company&#8217;s intent to implement the Reverse Stock Split and the Mandatory Conversion (as defined in the Series C Certificate) of all 10,000 shares of Series C Preferred Stock outstanding into an aggregate of 200 shares of the Company&#8217;s common stock.</p>
   <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#160;</p>
   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin: 0pt; text-indent: 45pt; text-align: justify;">As described in further detail above under, <i>Note <em style="font: inherit;">3.</em> Basis of Presentation and Summary of Significant Accounting Policies</i>, on <em style="font: inherit;"> April 18, 2022, </em>following the completion of the Special Meeting and the Series C Preferred Stock conversion, &#160;the Company implemented the Reverse Stock Split at a ratio of <em style="font: inherit;">1</em>-for-50 and beginning with the opening of trading on <em style="font: inherit;"> April 19, 2022, </em>the Company&#8217;s common stock was available for trading on the Nasdaq Capital Market on a Reverse Stock Split adjusted basis.</p>
   <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt;">&#160;</p>
   <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;"><i>Nasdaq Bid Price Requirement Compliance</i></p>
   <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#160;</p>
   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">On <em style="font: inherit;"> May 3, 2022, </em>the Company received a written notice from the Nasdaq Staff confirming that the Company has regained compliance with Nasdaq Listing Rule <em style="font: inherit;">5550</em>(a)(<em style="font: inherit;">2</em>) because the bid price for the Company&#8217;s common stock had closed above <em style="font: inherit;">$1.00</em> per share for the previous <em style="font: inherit;">ten</em> (<em style="font: inherit;">10</em>) consecutive business days ending <em style="font: inherit;"> May 2, 2022. </em>As previously reported, on <em style="font: inherit;"> May 6, 2021, </em>the Company received a written notice from the Nasdaq Staff indicating that the Company was <em style="font: inherit;">not</em> in compliance with Nasdaq Listing Rule <em style="font: inherit;">5550</em>(a)(<em style="font: inherit;">2</em>) because the bid price for the Company&#8217;s common stock had closed below <em style="font: inherit;">$1.00</em> per share for the previous <em style="font: inherit;">30</em> consecutive business day. The <em style="font: inherit;"> May 3, 2022 </em>letter confirmed this matter is now closed.</p>
   <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#160;</p>


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<span style="display: none;">v3.22.1</span><table class="report" border="0" cellspacing="2" id="idm140295878758744">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Significant Accounting Policies (Policies)<br></strong></div></th>
<th class="th" colspan="1">3 Months Ended</th>
</tr>
<tr><th class="th"><div>Mar. 31, 2022</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_AccountingPoliciesAbstract', window );"><strong>Accounting Policies [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
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<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_us-gaap_BasisOfAccountingPolicyPolicyTextBlock', window );">Basis of Accounting, Policy [Policy Text Block]</a></td>
<td class="text"><p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin: 0pt; text-indent: 9pt;"><i>Basis of Presentation</i></p>
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   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">The accompanying unaudited interim&#160;consolidated&#160;financial statements of the Company have been prepared in accordance with GAAP for interim financial information as found in the ASC and ASUs of the FASB, and with the instructions to Form <em style="font: inherit;">10</em>-Q and Article <em style="font: inherit;">10</em> of Regulation S-<em style="font: inherit;">X</em> promulgated by the SEC. In the opinion of management, the accompanying&#160;unaudited interim consolidated financial statements of the Company include all normal and recurring adjustments (which consist primarily of accruals, estimates and assumptions that impact the unaudited interim consolidated financial statements) considered necessary to present fairly the Company&#8217;s financial position as of&#160;<em style="font: inherit;"> March&#160;</em><em style="font: inherit;">31,</em> <em style="font: inherit;">2022,</em> and its results of operations and cash flows for the <em style="font: inherit;">three</em> months ended <em style="font: inherit;"> March&#160;</em><em style="font: inherit;">31,</em> <em style="font: inherit;">2022</em> and <em style="font: inherit;">2021.</em> Operating results for the <em style="font: inherit;">three</em> months ended&#160;<em style="font: inherit;"> March&#160;</em><em style="font: inherit;">31,</em> <em style="font: inherit;">2022</em> are <em style="font: inherit;">not</em> necessarily indicative of the results that <em style="font: inherit;"> may </em>be expected for the year ending <em style="font: inherit;"> December&#160;</em><em style="font: inherit;">31,</em> <em style="font: inherit;">2022.</em> The unaudited interim&#160;consolidated&#160;financial statements presented herein do <em style="font: inherit;">not</em> contain the required disclosures under GAAP for annual financial statements. The accompanying&#160;unaudited interim consolidated&#160;financial statements should be read in conjunction with the annual audited financial statements and related notes as of and for the year ended <em style="font: inherit;"> December&#160;</em><em style="font: inherit;">31,</em> <em style="font: inherit;">2021</em> filed with the SEC as part of the Annual Report.</p>
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<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_UseOfEstimates', window );">Use of Estimates, Policy [Policy Text Block]</a></td>
<td class="text"><p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 9pt;"><i>Use of Estimates</i></p>
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   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">The preparation of financial statements in conformity with GAAP requires the Company to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of expenses during the reporting period.</p>
   <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#160;</p>
   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">On an ongoing basis, the Company evaluates its estimates using historical experience and other factors, including the current economic environment. Significant items subject to such estimates are assumptions used for purposes of determining stock-based compensation and accounting for research and development activities. Management believes its estimates to be reasonable under the circumstances. Actual results could differ significantly from those estimates.</p>
   <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#160;</p><span></span>
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<td class="text"><p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 9pt;"><i>Fair Value of Financial Instruments</i></p>
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   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">The carrying amounts of the Company&#8217;s financial instruments, including cash equivalents and accounts payable approximate fair value due to the short-term nature of those instruments.&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;</p>
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<td class="text"><p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 9pt;"><i>Concentration of Credit Risk</i></p>
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   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">Financial instruments that potentially expose the Company to concentrations of credit risk consist principally of cash on deposit with multiple financial institutions, the balances of which frequently exceed federally insured limits.</p>
   <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#160;</p><span></span>
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<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CashAndCashEquivalentsPolicyTextBlock', window );">Cash and Cash Equivalents, Policy [Policy Text Block]</a></td>
<td class="text"><p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 9pt;"><i>Cash and Cash Equivalents</i></p>
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   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">The Company considers any highly-liquid investments, such as money market funds and commercial paper with an original maturity of <em style="font: inherit;">three</em> months or less to be cash and cash equivalents.</p>
   <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#160;</p><span></span>
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<td class="text"><p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 9pt;"><i>Marketable securities</i></p>
   <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#160;</p>
   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">The Company classifies its marketable securities as available-for-sale, which include commercial paper and U.S. government debt securities with original maturities of greater than <em style="font: inherit;">three</em> months from date of purchase. The Company considers its marketable securities as available for use in current operations, and therefore classify these securities as current assets on the consolidated balance sheet. These securities are carried at fair market value, with unrealized gains and losses reported in comprehensive loss and accumulated other comprehensive loss within stockholders&#8217; equity. Gains or losses on marketable securities sold will be based on the specific identification method.</p>
   <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt;text-indent:9pt;">&#160;</p><span></span>
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<td class="text"><p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt;"><i>Reverse Stock Split</i></p>
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   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">On <em style="font: inherit;"> April 18, 2022, </em>the Company filed a Certificate of Amendment to its Certificate of Incorporation, as amended, with the Secretary of State of the State of Delaware to effect the Reverse Stock Split at a ratio of <em style="font: inherit;">1</em>-to-50. No fractional shares were issued in connection with the Reverse Stock Split. Stockholders who otherwise would have been entitled to receive fractional shares of common stock are entitled to receive an amount in cash (without interest or deduction) equal to the fraction of <em style="font: inherit;">one</em> share to which such stockholder would otherwise be entitled multiplied by $12.93, representing the split-adjusted average closing price of the Company&#8217;s common stock on the Nasdaq Capital Market for the <em style="font: inherit;">five</em> consecutive trading days immediately preceding the effective date of the Reverse Stock Split. Proportional adjustments were made to the Company&#8217;s outstanding warrants, stock options and other equity securities and to the <em style="font: inherit;">2015</em> Equity Plan to reflect the Reverse Stock Split, in each case, in accordance with the terms thereof. Unless the context otherwise requires, all share and per share amounts in this Quarterly Report have been adjusted to reflect the Reverse Stock Split.</p>
   <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#160;</p><span></span>
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<td class="text"><p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt;"><i>Net Loss Per Common Share</i></p>
   <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#160;</p>
   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">Basic net loss per share is computed by dividing net loss attributable to common stockholders by the weighted average number of shares of common stock outstanding during each period. Diluted net loss per share includes the effect, if any, from the potential exercise or conversion of securities, such as convertible debt, convertible preferred stock, common stock warrants, stock options and unvested restricted stock that would result in the issuance of incremental shares of common stock. In computing the basic and diluted net loss per share applicable to common stockholders, the weighted average number of shares remains the same for both calculations due to the fact that when a net loss exists, dilutive shares are <em style="font: inherit;">not</em> included in the calculation as the impact is anti-dilutive.</p>
   <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt;text-indent:36pt;">&#160;</p>
   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">The following potentially dilutive securities outstanding as of <em style="font: inherit;"> March&#160;</em><em style="font: inherit;">31,</em> <em style="font: inherit;">2022</em> and <em style="font: inherit;">2021</em> have been excluded from the computation of diluted weighted average shares outstanding, as they would be anti-dilutive:</p>
   <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#160;</p>

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<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock', window );">New Accounting Pronouncements, Policy [Policy Text Block]</a></td>
<td class="text"><p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt;"><b><i>Recently Adopted Accounting Pronouncements</i></b></p>
   <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#160;</p>
   <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;">In <em style="font: inherit;"> June 2016, </em>the FASB issued ASU <em style="font: inherit;">2016</em>-<em style="font: inherit;">13,</em> <i>Financial Instruments</i>&#8212;<i>Credit Losses, Measurement of Credit Losses on Financial Instruments</i> (Topic <em style="font: inherit;">326</em>). The standard amends the impairment model by requiring entities to use a forward-looking approach based on expected losses to estimate credit losses for most financial assets and certain other instruments that aren&#8217;t measured at fair value through net income. For available-for-sale debt securities, entities will be required to recognize an allowance for credit losses rather than a reduction in carrying value of the asset. Entities will <em style="font: inherit;">no</em> longer be permitted to consider the length of time that fair value has been less than amortized cost when evaluating when credit losses should be recognized. This new guidance is effective for the Company as of <em style="font: inherit;"> January 1, 2023. </em>The Company is currently evaluating the impact of this ASU but&#160;does&#160;<em style="font: inherit;">not</em>&#160;expect that adoption of this standard will have a material impact on the consolidated financial statements and related disclosures.</p>
   <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;">&#160;</p><span></span>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Disclosure of accounting policy for 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>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Disclosure of accounting policy for cash and cash equivalents, including the policy for determining which items are treated as cash equivalents. Other information that may be disclosed includes (1) the nature of any restrictions on the entity's use of its cash and cash equivalents, (2) whether the entity's cash and cash equivalents are insured or expose the entity to credit risk, (3) the classification of any negative balance accounts (overdrafts), and (4) the carrying basis of cash equivalents (for example, at cost) and whether the carrying amount of cash equivalents approximates fair value.</p></div>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Disclosure of accounting policy for credit risk.</p></div>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Disclosure of accounting policy for computing basic and diluted earnings or loss per share for each class of common stock and participating security. Addresses all significant policy factors, including any antidilutive items that have been excluded from the computation and takes into account stock dividends, splits and reverse splits that occur after the balance sheet date of the latest reporting period but before the issuance of the financial statements.</p></div>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Disclosure of accounting policy for determining the fair value of financial instruments.</p></div>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Disclosure of accounting policy for investment classified as marketable security.</p></div>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Disclosure of accounting policy pertaining to new accounting pronouncements that may impact the entity's financial reporting. Includes, but is not limited to, quantification of the expected or actual impact.</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 );">- Definition</a><div><p>Disclosure of accounting policy for its capital stock transactions, including dividends and accumulated other comprehensive income.</p></div>
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<span style="display: none;">v3.22.1</span><table class="report" border="0" cellspacing="2" id="idm140295880867640">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Note 3 - Basis of Presentation and Summary of Significant Accounting Policies (Tables)<br></strong></div></th>
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<tr><th class="th"><div>Mar. 31, 2022</div></th></tr>
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<td class="text">&#160;<span></span>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities.</p></div>
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<span style="display: none;">v3.22.1</span><table class="report" border="0" cellspacing="2" id="idm140295883676648">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Note 4 - Cash, Cash Equivalents and Marketable Securities (Tables)<br></strong></div></th>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Tabular disclosure 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/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 320<br> -URI https://asc.fasb.org/topic&amp;trid=2196928<br></p></div>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Tabular disclosure of the components of cash and cash equivalents.</p></div>
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<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Note 5 - Fair Value of Financial Instruments (Tables)<br></strong></div></th>
<th class="th" colspan="1">3 Months Ended</th>
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<tr><th class="th"><div>Mar. 31, 2022</div></th></tr>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class 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;">v3.22.1</span><table class="report" border="0" cellspacing="2" id="idm140295881761128">
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<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Note 6 - Accrued Expenses and Other Current Liabilities (Tables)<br></strong></div></th>
<th class="th" colspan="1">3 Months Ended</th>
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<tr><th class="th"><div>Mar. 31, 2022</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_TableTextBlock', window );"><strong>Notes Tables</strong></a></td>
<td class="text">&#160;<span></span>
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<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_us-gaap_OtherCurrentLiabilitiesTableTextBlock', window );">Other Current Liabilities [Table Text Block]</a></td>
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<tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Accrued clinical studies expenses</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#160;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#160;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">1,472,119</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#160;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#160;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#160;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">786,579</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#160;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Other</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#160;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);">&#160;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);">127,999</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;">&#160;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#160;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);">&#160;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);">65,935</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;">&#160;</td></tr>
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<span style="display: none;">v3.22.1</span><table class="report" border="0" cellspacing="2" id="idm140295880831816">
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<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Note 7 - Stockholders' Equity and Common Stock Warrants (Tables)<br></strong></div></th>
<th class="th" colspan="1">3 Months Ended</th>
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<tr><th class="th"><div>Mar. 31, 2022</div></th></tr>
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<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ScheduleOfStockholdersEquityNoteWarrantsOrRightsTextBlock', window );">Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]</a></td>
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    <table border="0" cellpadding="0" cellspacing="0" class="finTable" style="width: 100%; font-size: 10pt; font-family: Times New Roman; text-indent: 0px;"><tbody><tr style="vertical-align: bottom;"><td style="font-family: Times New Roman; font-size: 10pt; width: 52%;">&#160;</td><td style="font-family: Times New Roman; font-size: 10pt; width: 1%;">&#160;</td><td colspan="2" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0); width: 1%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b><b>Outstanding</b></b></p> </td><td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; width: 1%;">&#160;</td><td style="font-family: Times New Roman; font-size: 10pt; width: 1%;">&#160;</td><td colspan="3" rowspan="1" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0); width: 9%;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b><b>Range of exercise</b></b></p> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b><b>price per share</b></b></p> </td><td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; width: 1%;">&#160;</td><td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; width: 1%;">&#160;</td><td style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; width: 18%; border-bottom: 1px solid rgb(0, 0, 0);"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"><b>Expiration dates</b></p> </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;">v3.22.1</span><table class="report" border="0" cellspacing="2" id="idm140295878013416">
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<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Note 8 - Stock-based Compensation (Tables)<br></strong></div></th>
<th class="th" colspan="1">3 Months Ended</th>
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<tr><th class="th"><div>Mar. 31, 2022</div></th></tr>
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<td class="pl custom" 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 Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]</a></td>
<td class="text">
    <table border="0" cellpadding="0" cellspacing="0" class="finTable" style="width: 100%; font-size: 10pt; font-family: Times New Roman; text-indent: 0px;"><tbody><tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"><td style="font-family: Times New Roman; font-size: 10pt; width: 85%;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Expected term (in years)</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#160;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#160;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">5.7</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#160;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Risk-free interest rate</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#160;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#160;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">1.7</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">%</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Expected volatility</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#160;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#160;</td><td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">134.7</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">%</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Dividend yield</p> </td><td style="width: 1%; font-family: &quot;Times New Roman&quot;; font-size: 10pt;">&#160;</td><td style="width: 1%; font-family: &quot;Times New Roman&quot;; font-size: 10pt;">&#160;</td><td style="width: 12%; font-family: &quot;Times New Roman&quot;; font-size: 10pt; margin-left: 0pt; text-align: right;"><em style="font: inherit;">&#8212;</em></td><td style="width: 1%; font-family: &quot;Times New Roman&quot;; font-size: 10pt; margin-left: 0pt;">&#160;</td></tr>
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<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ScheduleOfShareBasedCompensationRestrictedStockUnitsAwardActivityTableTextBlock', window );">Share-Based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block]</a></td>
<td class="text">
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<tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"><td style="font-family: Times New Roman; font-size: 10pt; width: 66%;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Balance at January 1, 2022</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#160;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#160;</td><td style="width: 14%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">5,509</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#160;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#160;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">$</td><td style="width: 14%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">34.78</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#160;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"><td style="font-family: Times New Roman; font-size: 10pt; width: 66%;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Vested (1)</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px;">&#160;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);">&#160;</td><td style="width: 14%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);">(327</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; padding-bottom: 1px;">)</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#160;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#160;</td><td style="width: 14%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">25.50</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#160;</td></tr>
<tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"><td style="font-family: Times New Roman; font-size: 10pt; width: 66%;"> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Outstanding at March 31, 2022</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#160;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#160;</td><td style="width: 14%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">5,182</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#160;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;">&#160;</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">$</td><td style="width: 14%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">35.36</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">&#160;</td></tr>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement.</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 (h)(1)<br> -URI https://asc.fasb.org/extlink&amp;oid=128089324&amp;loc=d3e5070-113901<br></p></div>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year.</p></div>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.</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 (d)<br> -URI https://asc.fasb.org/extlink&amp;oid=128089324&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 (e)<br> -URI https://asc.fasb.org/extlink&amp;oid=128089324&amp;loc=d3e5070-113901<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 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (c)(1)<br> -URI https://asc.fasb.org/extlink&amp;oid=128089324&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>
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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>
<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)<br> -URI https://asc.fasb.org/extlink&amp;oid=128089324&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">
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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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<span style="display: none;">v3.22.1</span><table class="report" border="0" cellspacing="2" id="idm140295880827848">
<tr>
<th class="tl" colspan="1" rowspan="1"><div style="width: 200px;"><strong>Note 1 - Organization and Description of Business (Details Textual)<br></strong></div></th>
<th class="th"><div>Apr. 18, 2022</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_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember', window );">Subsequent Event [Member] | Reverse Stock Split [Member ]</a></td>
<td class="text">&#160;<span></span>
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<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockholdersEquityNoteStockSplitConversionRatio1', window );">Stockholders' Equity Note, Stock Split, Conversion Ratio</a></td>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one.</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 4<br> -Subparagraph (SAB TOPIC 4.C)<br> -URI https://asc.fasb.org/extlink&amp;oid=120397183&amp;loc=d3e187143-122770<br></p></div>
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<span style="display: none;">v3.22.1</span><table class="report" border="0" cellspacing="2" id="idm140295881524984">
<tr>
<th class="tl" colspan="1" rowspan="1"><div style="width: 200px;"><strong>Note 3 - Basis of Presentation and Summary of Significant Accounting Policies (Details Textual) - Subsequent Event [Member]<br> shares in Thousands</strong></div></th>
<th class="th">
<div>Apr. 18, 2022 </div>
<div>$ / shares </div>
<div>shares</div>
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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_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember', window );">Reverse Stock Split [Member ]</a></td>
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<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockholdersEquityNoteStockSplitConversionRatio1', window );">Stockholders' Equity Note, Stock Split, Conversion Ratio</a></td>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The per share multiple used to determine the price paid for franctional share in a stock reverse split.</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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<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Represents the number of fractional shares were issued in connection with the Reverse Stock Split.</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;">dffn_StockIssuedDuringPeriodFractionalSharesReverseStockSplit</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dffn_</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_StockholdersEquityNoteStockSplitConversionRatio1">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one.</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 4<br> -Subparagraph (SAB TOPIC 4.C)<br> -URI https://asc.fasb.org/extlink&amp;oid=120397183&amp;loc=d3e187143-122770<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_StockholdersEquityNoteStockSplitConversionRatio1</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:pureItemType</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_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.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_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember</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_NonmonetaryTransactionTypeAxis=dffn_ReverseStockSplitMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.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_NonmonetaryTransactionTypeAxis=dffn_ReverseStockSplitMember</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>37
<FILENAME>R26.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;">v3.22.1</span><table class="report" border="0" cellspacing="2" id="idm140295881636984">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Note 3 - Basis of Presentation and Summary of Significant Accounting Policies - Outstanding Dilutive Securities (Details) - shares<br></strong></div></th>
<th class="th" colspan="2">3 Months Ended</th>
</tr>
<tr>
<th class="th"><div>Mar. 31, 2022</div></th>
<th class="th"><div>Mar. 31, 2021</div></th>
</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_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount', window );">Anti-dilutive securities (in shares)</a></td>
<td class="nump">233,637<span></span>
</td>
<td class="nump">178,359<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_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis=us-gaap_WarrantMember', window );">Warrant [Member]</a></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_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount', window );">Anti-dilutive securities (in shares)</a></td>
<td class="nump">111,891<span></span>
</td>
<td class="nump">112,963<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_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis=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="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount', window );">Anti-dilutive securities (in shares)</a></td>
<td class="nump">116,564<span></span>
</td>
<td class="nump">62,336<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_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis=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="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount', window );">Anti-dilutive securities (in shares)</a></td>
<td class="nump">5,182<span></span>
</td>
<td class="nump">3,060<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_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.</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 1<br> -Subparagraph (c)<br> -URI https://asc.fasb.org/extlink&amp;oid=124432515&amp;loc=d3e3550-109257<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>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount</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_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis=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_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis=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_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis=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_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis=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_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis=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_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis=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>
</div>
</body>
</html>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>XML
<SEQUENCE>38
<FILENAME>R27.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;">v3.22.1</span><table class="report" border="0" cellspacing="2" id="idm140295877965144">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Note 4 - Cash, Cash Equivalents and Marketable Securities (Details Textual) - USD ($)<br></strong></div></th>
<th class="th" colspan="1">3 Months Ended</th>
<th class="th" colspan="1"></th>
</tr>
<tr>
<th class="th"><div>Mar. 31, 2022</div></th>
<th class="th"><div>Dec. 31, 2021</div></th>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AvailableForSaleSecuritiesDebtSecurities', window );">Debt Securities, Available-for-Sale, Total</a></td>
<td class="nump">$ 22,680,303<span></span>
</td>
<td class="nump">$ 0<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_dffn_MarketableSecuritiesOtherthantemporaryImpairmentLoss', window );">Marketable Securities, Other-than-temporary Impairment Loss</a></td>
<td class="nump">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_us-gaap_MarketableSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairments', window );">Marketable Securities, Realized Gain (Loss), Excluding Other-than-temporary Impairment Loss</a></td>
<td class="nump">$ 0<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_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="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dffn_MarketableSecuritiesContractualMaturity', window );">Marketable Securities Contractual Maturity (Month)</a></td>
<td class="text">3 months<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_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 custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dffn_MarketableSecuritiesContractualMaturity', window );">Marketable Securities Contractual Maturity (Month)</a></td>
<td class="text">12 months<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_dffn_MarketableSecuritiesContractualMaturity">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></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 contractual maturity of marketable 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;">dffn_MarketableSecuritiesContractualMaturity</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dffn_</td>
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<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_dffn_MarketableSecuritiesOtherthantemporaryImpairmentLoss">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></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 other-than-temporary impairment loss on marketable 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;">dffn_MarketableSecuritiesOtherthantemporaryImpairmentLoss</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dffn_</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_AvailableForSaleSecuritiesDebtSecurities">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></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).</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(6))<br> -URI https://asc.fasb.org/extlink&amp;oid=126897435&amp;loc=d3e534808-122878<br><br>Reference 2: 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 https://asc.fasb.org/extlink&amp;oid=124258926&amp;loc=SL82898722-210454<br><br>Reference 3: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 320<br> -SubTopic 10<br> -Section 45<br> -Paragraph 1<br> -Subparagraph (b)<br> -URI https://asc.fasb.org/extlink&amp;oid=124260329&amp;loc=d3e26610-111562<br><br>Reference 4: 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 2<br> -Subparagraph (aa)<br> -URI https://asc.fasb.org/extlink&amp;oid=126970911&amp;loc=d3e27161-111563<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_AvailableForSaleSecuritiesDebtSecurities</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_MarketableSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairments">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></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 realized gain (loss) on investment in marketable security, excluding other-than-temporary impairment (OTTI).</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_MarketableSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairments</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>
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<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>
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<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>
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<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
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<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_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>
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<td><strong> Data Type:</strong></td>
<td>na</td>
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<td><strong> Balance Type:</strong></td>
<td></td>
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<TEXT>
<html>
<head>
<title></title>
<link rel="stylesheet" type="text/css" href="report.css">
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<span style="display: none;">v3.22.1</span><table class="report" border="0" cellspacing="2" id="idm140295881645896">
<tr>
<th class="tl" colspan="1" rowspan="1"><div style="width: 200px;"><strong>Note 4 - Cash, Cash Equivalents and Marketable Securities - Cash and Cah Equivalents (Details) - USD ($)<br></strong></div></th>
<th class="th"><div>Mar. 31, 2022</div></th>
<th class="th"><div>Dec. 31, 2021</div></th>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CashAndCashEquivalentsAtCarryingValue', window );">Cash and cash equivalents</a></td>
<td class="nump">$ 9,872,330<span></span>
</td>
<td class="nump">$ 37,313,558<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_CashAndCashEquivalentsAxis=us-gaap_BankTimeDepositsMember', window );">Bank Time Deposits [Member]</a></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_us-gaap_CashAndCashEquivalentsAtCarryingValue', window );">Cash and cash equivalents</a></td>
<td class="nump">1,326,178<span></span>
</td>
<td class="nump">30,308,075<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_CashAndCashEquivalentsAxis=us-gaap_MoneyMarketFundsMember', window );">Money Market Funds [Member]</a></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_us-gaap_CashAndCashEquivalentsAtCarryingValue', window );">Cash and cash equivalents</a></td>
<td class="nump">5,046,607<span></span>
</td>
<td class="nump">7,005,483<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_CashAndCashEquivalentsAxis=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 custom" 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">$ 3,499,545<span></span>
</td>
<td class="nump">$ 0<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 https://asc.fasb.org/extlink&amp;oid=126954810&amp;loc=d3e3044-108585<br><br>Reference 2: http://www.xbrl.org/2003/role/exampleRef<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 https://asc.fasb.org/extlink&amp;oid=124098289&amp;loc=d3e6676-107765<br><br>Reference 3: 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(1))<br> -URI https://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>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_CashAndCashEquivalentsAxis=us-gaap_BankTimeDepositsMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.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_CashAndCashEquivalentsAxis=us-gaap_BankTimeDepositsMember</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>
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<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
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<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</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 );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_CashAndCashEquivalentsAxis=us-gaap_MoneyMarketFundsMember</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_CashAndCashEquivalentsAxis=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_CashAndCashEquivalentsAxis=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>
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<DOCUMENT>
<TYPE>XML
<SEQUENCE>40
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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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<span style="display: none;">v3.22.1</span><table class="report" border="0" cellspacing="2" id="idm140295878517064">
<tr>
<th class="tl" colspan="1" rowspan="1"><div style="width: 200px;"><strong>Note 4 - Cash, Cash Equivalents and Marketable Securities - Marketable Securities (Details) - USD ($)<br></strong></div></th>
<th class="th"><div>Mar. 31, 2022</div></th>
<th class="th"><div>Dec. 31, 2021</div></th>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis', window );">Amortized cost</a></td>
<td class="nump">$ 22,729,961<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_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax', window );">Commercial paper</a></td>
<td class="nump">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_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax', window );">Commercial paper</a></td>
<td class="num">(49,658)<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_us-gaap_AvailableForSaleSecuritiesDebtSecurities', window );">Fair Value</a></td>
<td class="nump">22,680,303<span></span>
</td>
<td class="nump">$ 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_FinancialInstrumentAxis=us-gaap_CommercialPaperNotIncludedWithCashAndCashEquivalentsMember', window );">Commercial Paper, Not Included with Cash and Cash Equivalents [Member]</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_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis', window );">Amortized cost</a></td>
<td class="nump">19,716,092<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_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax', window );">Commercial paper</a></td>
<td class="nump">0<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_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax', window );">Commercial paper</a></td>
<td class="num">(39,939)<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_us-gaap_AvailableForSaleSecuritiesDebtSecurities', window );">Fair Value</a></td>
<td class="nump">19,676,153<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_FinancialInstrumentAxis=us-gaap_USTreasurySecuritiesMember', window );">US Treasury 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 custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis', window );">Amortized cost</a></td>
<td class="nump">3,013,869<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_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax', window );">Commercial paper</a></td>
<td class="nump">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_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax', window );">Commercial paper</a></td>
<td class="num">(9,719)<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_us-gaap_AvailableForSaleSecuritiesDebtSecurities', window );">Fair Value</a></td>
<td class="nump">$ 3,004,150<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_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></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 tax, of unrealized gain in accumulated other comprehensive income (AOCI) on 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 320<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (b)<br> -URI https://asc.fasb.org/extlink&amp;oid=126970911&amp;loc=d3e27161-111563<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_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax</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>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_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></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 tax, of unrealized loss in accumulated other comprehensive income (AOCI) on 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 320<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (c)<br> -URI https://asc.fasb.org/extlink&amp;oid=126970911&amp;loc=d3e27161-111563<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_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax</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>
</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_AvailableForSaleDebtSecuritiesAmortizedCostBasis">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></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).</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 2<br> -Subparagraph (a)<br> -URI https://asc.fasb.org/extlink&amp;oid=126970911&amp;loc=d3e27161-111563<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 326<br> -SubTopic 30<br> -Section 45<br> -Paragraph 1<br> -URI https://asc.fasb.org/extlink&amp;oid=124258926&amp;loc=SL82898722-210454<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_AvailableForSaleDebtSecuritiesAmortizedCostBasis</td>
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<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</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>Amount 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 942<br> -SubTopic 210<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.9-03(6))<br> -URI https://asc.fasb.org/extlink&amp;oid=126897435&amp;loc=d3e534808-122878<br><br>Reference 2: 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 https://asc.fasb.org/extlink&amp;oid=124258926&amp;loc=SL82898722-210454<br><br>Reference 3: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 320<br> -SubTopic 10<br> -Section 45<br> -Paragraph 1<br> -Subparagraph (b)<br> -URI https://asc.fasb.org/extlink&amp;oid=124260329&amp;loc=d3e26610-111562<br><br>Reference 4: 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 2<br> -Subparagraph (aa)<br> -URI https://asc.fasb.org/extlink&amp;oid=126970911&amp;loc=d3e27161-111563<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_AvailableForSaleSecuritiesDebtSecurities</td>
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<td>debit</td>
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<td>instant</td>
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<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_FinancialInstrumentAxis=us-gaap_CommercialPaperNotIncludedWithCashAndCashEquivalentsMember</td>
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<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_FinancialInstrumentAxis=us-gaap_USTreasurySecuritiesMember</td>
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<td></td>
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<td>na</td>
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<span style="display: none;">v3.22.1</span><table class="report" border="0" cellspacing="2" id="idm140295874918232">
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<th class="tl" colspan="1" rowspan="1"><div style="width: 200px;"><strong>Note 5 - Fair Value of Financial Instruments - Assets Measured at Fair Value on Recurring Basis (Details) - USD ($)<br></strong></div></th>
<th class="th"><div>Mar. 31, 2022</div></th>
<th class="th"><div>Dec. 31, 2021</div></th>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AvailableForSaleSecuritiesDebtSecurities', window );">Fair Value</a></td>
<td class="nump">$ 22,680,303<span></span>
</td>
<td class="nump">$ 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_FinancialInstrumentAxis=us-gaap_CommercialPaperNotIncludedWithCashAndCashEquivalentsMember', window );">Commercial Paper, Not Included with Cash and Cash Equivalents [Member]</a></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_us-gaap_AvailableForSaleSecuritiesDebtSecurities', window );">Fair Value</a></td>
<td class="nump">19,676,153<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_FinancialInstrumentAxis=us-gaap_USTreasurySecuritiesMember', window );">US Treasury 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 custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AvailableForSaleSecuritiesDebtSecurities', window );">Fair Value</a></td>
<td class="nump">3,004,150<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_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member', window );">Fair Value, Inputs, Level 1 [Member] | 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 custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CashAndCashEquivalentsFairValueDisclosure', window );">Cash and cash equivalents</a></td>
<td class="nump">5,046,607<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_us-gaap_AvailableForSaleSecuritiesDebtSecurities', window );">Fair Value</a></td>
<td class="nump">0<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="reu">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AssetsFairValueDisclosure', window );">Total financial assets</a></td>
<td class="nump">5,046,607<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_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member', window );">Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Commercial Paper, Not Included with Cash and Cash Equivalents [Member]</a></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_us-gaap_AvailableForSaleSecuritiesDebtSecurities', window );">Fair Value</a></td>
<td class="nump">0<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_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member', window );">Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | US Treasury 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 custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AvailableForSaleSecuritiesDebtSecurities', window );">Fair Value</a></td>
<td class="nump">0<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_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member', window );">Fair Value, Inputs, Level 2 [Member] | 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 custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CashAndCashEquivalentsFairValueDisclosure', window );">Cash and cash equivalents</a></td>
<td class="nump">3,499,545<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_us-gaap_AvailableForSaleSecuritiesDebtSecurities', window );">Fair Value</a></td>
<td class="nump">22,680,303<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="reu">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AssetsFairValueDisclosure', window );">Total financial assets</a></td>
<td class="nump">26,179,848<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_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member', window );">Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Commercial Paper, Not Included with Cash and Cash Equivalents [Member]</a></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_us-gaap_AvailableForSaleSecuritiesDebtSecurities', window );">Fair Value</a></td>
<td class="nump">19,676,153<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_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member', window );">Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | US Treasury 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 custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AvailableForSaleSecuritiesDebtSecurities', window );">Fair Value</a></td>
<td class="nump">3,004,150<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_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member', window );">Fair Value, Inputs, Level 3 [Member] | 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 custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CashAndCashEquivalentsFairValueDisclosure', window );">Cash and cash equivalents</a></td>
<td class="nump">0<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_us-gaap_AvailableForSaleSecuritiesDebtSecurities', window );">Fair Value</a></td>
<td class="nump">0<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="reu">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AssetsFairValueDisclosure', window );">Total financial assets</a></td>
<td class="nump">0<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_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member', window );">Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Commercial Paper, Not Included with Cash and Cash Equivalents [Member]</a></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_us-gaap_AvailableForSaleSecuritiesDebtSecurities', window );">Fair Value</a></td>
<td class="nump">0<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
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<td class="text">&#160;<span></span>
</td>
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<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CashAndCashEquivalentsFairValueDisclosure', window );">Cash and cash equivalents</a></td>
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</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_us-gaap_CashAndCashEquivalentsAxis=us-gaap_CommercialPaperMember', window );">Commercial Paper [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]</a></td>
<td class="text">&#160;<span></span>
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<td class="nump">3,499,545<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_CashAndCashEquivalentsAxis=us-gaap_CommercialPaperMember', window );">Commercial Paper [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]</a></td>
<td class="text">&#160;<span></span>
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<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CashAndCashEquivalentsFairValueDisclosure', window );">Cash and cash equivalents</a></td>
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<td class="text">&#160;<span></span>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.</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">
<tr>
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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).</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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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Fair value portion 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.</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;">v3.22.1</span><table class="report" border="0" cellspacing="2" id="idm140295877965592">
<tr>
<th class="tl" colspan="1" rowspan="1"><div style="width: 200px;"><strong>Note 6 - Accrued Expenses and Other Current Liabilities - Summary of Accrued Expenses (Details) - USD ($)<br></strong></div></th>
<th class="th"><div>Mar. 31, 2022</div></th>
<th class="th"><div>Dec. 31, 2021</div></th>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AccruedSalariesCurrent', window );">Accrued payroll and payroll related expenses</a></td>
<td class="nump">$ 399,847<span></span>
</td>
<td class="nump">$ 879,971<span></span>
</td>
</tr>
<tr class="ro">
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<td class="nump">142,668<span></span>
</td>
<td class="nump">247,704<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_dffn_AccruedClinicalStudiesExpensesCurrent', window );">Accrued clinical studies expenses</a></td>
<td class="nump">1,472,119<span></span>
</td>
<td class="nump">786,579<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_us-gaap_OtherSundryLiabilitiesCurrent', window );">Other</a></td>
<td class="nump">127,999<span></span>
</td>
<td class="nump">65,935<span></span>
</td>
</tr>
<tr class="reu">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OtherAccruedLiabilitiesCurrent', window );">Total</a></td>
<td class="nump">$ 2,142,633<span></span>
</td>
<td class="nump">$ 1,980,189<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dffn_AccruedClinicalStudiesExpensesCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></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 clinical studies.</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;">dffn_AccruedClinicalStudiesExpensesCurrent</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dffn_</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 S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.20)<br> -URI https://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_AccruedProfessionalFeesCurrent</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>
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<td><strong> Balance Type:</strong></td>
<td>credit</td>
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<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
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</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_AccruedSalariesCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></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 the obligations incurred through that date and payable for employees' services provided. 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 https://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 210<br> -SubTopic 10<br> -Section 45<br> -Paragraph 8<br> -Subparagraph (c)<br> -URI https://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_AccruedSalariesCurrent</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>
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<td><strong> Balance Type:</strong></td>
<td>credit</td>
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<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_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 https://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_OtherAccruedLiabilitiesCurrent</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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<td><strong> Balance Type:</strong></td>
<td>credit</td>
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<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_OtherSundryLiabilitiesCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Obligations not otherwise itemized or categorized in the footnotes to the financial statements that are due within one year or operating cycle, if longer, from 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 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.20)<br> -URI https://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 470<br> -SubTopic 10<br> -Section 45<br> -Paragraph 10<br> -URI https://asc.fasb.org/extlink&amp;oid=99376301&amp;loc=d3e1243-112600<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_OtherSundryLiabilitiesCurrent</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> Period Type:</strong></td>
<td>instant</td>
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<span style="display: none;">v3.22.1</span><table class="report" border="0" cellspacing="2" id="idm140295881755928">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Note 7 - Stockholders' Equity and Common Stock Warrants (Details Textual)<br></strong></div></th>
<th class="th" colspan="1"></th>
<th class="th" colspan="1"></th>
<th class="th" colspan="1">3 Months Ended</th>
</tr>
<tr>
<th class="th">
<div>Apr. 18, 2022 </div>
<div>shares</div>
</th>
<th class="th">
<div>Mar. 18, 2022 </div>
<div>USD ($) </div>
<div>$ / shares </div>
<div>shares</div>
</th>
<th class="th">
<div>Mar. 31, 2022 </div>
<div>shares</div>
</th>
</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_dffn_ClassOfWarrantOrRightsExpired', window );">Class of Warrant or Rights, Expired (in shares)</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">18,077<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_ConversionOfStockByUniqueDescriptionAxis=dffn_ConversionOfSeriesCPreferredStockIntoCommonStockMember', window );">Conversion of Series C Preferred Stock into Common Stock [Member] | Subsequent Event [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="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ConversionOfStockSharesConverted1', window );">Conversion of Stock, Shares Converted (in shares)</a></td>
<td class="nump">10,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ConversionOfStockSharesIssued1', window );">Conversion of Stock, Shares Issued (in shares)</a></td>
<td class="nump">200<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_StatementClassOfStockAxis=us-gaap_SeriesCPreferredStockMember', window );">Series C Preferred 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>
</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_us-gaap_PreferredStockConvertibleConversionRatio', window );">Preferred Stock, Convertible, Conversion Ratio</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">0.02<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_us-gaap_PreferredStockConvertibleConversionPrice', window );">Preferred Stock, Convertible, Conversion Price (in dollars per share) | $ / shares</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 25.00<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_StatementClassOfStockAxis=us-gaap_SeriesCPreferredStockMember', window );">Series C Preferred Stock [Member] | President [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="re">
<td class="pl custom" 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 (in shares)</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">10,000<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_us-gaap_SaleOfStockPricePerShare', window );">Sale of Stock, Price Per Share (in dollars per share) | $ / shares</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 0.50<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_us-gaap_ProceedsFromIssuanceOfConvertiblePreferredStock', window );">Proceeds from Issuance of Convertible Preferred Stock | $</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 5,000<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_dffn_ClassOfWarrantOrRightsExpired">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></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 expired.</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;">dffn_ClassOfWarrantOrRightsExpired</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dffn_</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_ConversionOfStockSharesConverted1">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></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 converted in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "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 4<br> -URI https://asc.fasb.org/extlink&amp;oid=126999549&amp;loc=d3e4313-108586<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 3<br> -URI https://asc.fasb.org/extlink&amp;oid=126999549&amp;loc=d3e4304-108586<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 5<br> -URI https://asc.fasb.org/extlink&amp;oid=126999549&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_ConversionOfStockSharesConverted1</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_ConversionOfStockSharesIssued1">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></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 new shares issued in the conversion of stock in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "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 5<br> -URI https://asc.fasb.org/extlink&amp;oid=126999549&amp;loc=d3e4332-108586<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 4<br> -URI https://asc.fasb.org/extlink&amp;oid=126999549&amp;loc=d3e4313-108586<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 3<br> -URI https://asc.fasb.org/extlink&amp;oid=126999549&amp;loc=d3e4304-108586<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_ConversionOfStockSharesIssued1</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_PreferredStockConvertibleConversionPrice">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></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 conversion price of 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/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section 50<br> -Paragraph 13<br> -Subparagraph (c)<br> -URI https://asc.fasb.org/extlink&amp;oid=126973232&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_PreferredStockConvertibleConversionPrice</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_PreferredStockConvertibleConversionRatio">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></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 shares issuable upon conversion for each share of preferred stock to be converted.</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 13<br> -Subparagraph (c)<br> -URI https://asc.fasb.org/extlink&amp;oid=126973232&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_PreferredStockConvertibleConversionRatio</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:pureItemType</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_ProceedsFromIssuanceOfConvertiblePreferredStock">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></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 preferred stocks identified as being convertible into another form of financial instrument, typically the entity's 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 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 14<br> -Subparagraph (a)<br> -URI https://asc.fasb.org/extlink&amp;oid=126954810&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_ProceedsFromIssuanceOfConvertiblePreferredStock</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_SaleOfStockPricePerShare">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></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 amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.</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_SaleOfStockPricePerShare</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 https://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 https://asc.fasb.org/extlink&amp;oid=126973232&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 https://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 https://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_ConversionOfStockByUniqueDescriptionAxis=dffn_ConversionOfSeriesCPreferredStockIntoCommonStockMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.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_ConversionOfStockByUniqueDescriptionAxis=dffn_ConversionOfSeriesCPreferredStockIntoCommonStockMember</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_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.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_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember</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_StatementClassOfStockAxis=us-gaap_SeriesCPreferredStockMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.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_StatementClassOfStockAxis=us-gaap_SeriesCPreferredStockMember</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=srt_PresidentMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.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=srt_PresidentMember</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>
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<head>
<title></title>
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<span style="display: none;">v3.22.1</span><table class="report" border="0" cellspacing="2" id="idm140295878705560">
<tr>
<th class="tl" colspan="1" rowspan="1"><div style="width: 200px;"><strong>Note 7 - Stockholders' Equity and Common Stock Warrants - Warrants Outstanding to Acquire Shares of Its Common Stock (Details)<br></strong></div></th>
<th class="th">
<div>Mar. 31, 2022 </div>
<div>$ / shares </div>
<div>shares</div>
</th>
</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_us-gaap_ClassOfWarrantOrRightOutstanding', window );">Common stock warrants, outstanding (in shares) | shares</a></td>
<td class="nump">111,891<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_ClassOfWarrantOrRightAxis=dffn_WarrantsIssuedInConnectionWithTheJanuary2018OfferingMember', window );">Warrants Issued in Connection with the January 2018 Offering [Member]</a></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_us-gaap_ClassOfWarrantOrRightOutstanding', window );">Common stock warrants, outstanding (in shares) | shares</a></td>
<td class="nump">23,639<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_ClassOfWarrantOrRightAxis=dffn_WarrantsIssuedInConnectionWithTheJanuary2018OfferingMember', window );">Warrants Issued in Connection with the January 2018 Offering [Member] | Minimum [Member]</a></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_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1', window );">Range of exercise price (in dollars per share)</a></td>
<td class="nump">$ 599.71<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_ClassOfWarrantOrRightAxis=dffn_WarrantsIssuedInConnectionWithTheJanuary2018OfferingMember', window );">Warrants Issued in Connection with the January 2018 Offering [Member] | Maximum [Member]</a></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_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1', window );">Range of exercise price (in dollars per share)</a></td>
<td class="nump">$ 749.76<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_ClassOfWarrantOrRightAxis=dffn_WarrantsIssuedInConnectionWithMay2019PublicOfferingMember', window );">Warrants Issued in Connection with May 2019 Public Offering [Member]</a></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_us-gaap_ClassOfWarrantOrRightOutstanding', window );">Common stock warrants, outstanding (in shares) | shares</a></td>
<td class="nump">27,648<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_ClassOfWarrantOrRightAxis=dffn_WarrantsIssuedInConnectionWithMay2019PublicOfferingMember', window );">Warrants Issued in Connection with May 2019 Public Offering [Member] | Minimum [Member]</a></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_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1', window );">Range of exercise price (in dollars per share)</a></td>
<td class="nump">$ 250.09<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_ClassOfWarrantOrRightAxis=dffn_WarrantsIssuedInConnectionWithMay2019PublicOfferingMember', window );">Warrants Issued in Connection with May 2019 Public Offering [Member] | Maximum [Member]</a></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_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1', window );">Range of exercise price (in dollars per share)</a></td>
<td class="nump">$ 306.04<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_ClassOfWarrantOrRightAxis=dffn_WarrantsIssuedInConnectionWithTheNovember2019OfferingMember', window );">Warrants Issued in Connection with the November 2019 Offering [Member]</a></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_us-gaap_ClassOfWarrantOrRightOutstanding', window );">Common stock warrants, outstanding (in shares) | shares</a></td>
<td class="nump">4,269<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_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1', window );">Range of exercise price (in dollars per share)</a></td>
<td class="nump">$ 17.51<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_ClassOfWarrantOrRightAxis=dffn_WarrantsIssuedInConnectionWithTheDecember2019OfferingMember', window );">Warrants Issued in Connection with the December 2019 Offering [Member]</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_us-gaap_ClassOfWarrantOrRightOutstanding', window );">Common stock warrants, outstanding (in shares) | shares</a></td>
<td class="nump">6,264<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_ClassOfWarrantOrRightAxis=dffn_WarrantsIssuedInConnectionWithTheDecember2019OfferingMember', window );">Warrants Issued in Connection with the December 2019 Offering [Member] | Minimum [Member]</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_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1', window );">Range of exercise price (in dollars per share)</a></td>
<td class="nump">$ 21.68<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_ClassOfWarrantOrRightAxis=dffn_WarrantsIssuedInConnectionWithTheDecember2019OfferingMember', window );">Warrants Issued in Connection with the December 2019 Offering [Member] | Maximum [Member]</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_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1', window );">Range of exercise price (in dollars per share)</a></td>
<td class="nump">$ 34.92<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_ClassOfWarrantOrRightAxis=dffn_CommonStockWarrantsIssuedRelatedToMay2020CommonStockOfferingMember', window );">Common Stock Warrants Issued Related to May 2020 Common Stock Offering [Member]</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_us-gaap_ClassOfWarrantOrRightOutstanding', window );">Common stock warrants, outstanding (in shares) | shares</a></td>
<td class="nump">11,424<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_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1', window );">Range of exercise price (in dollars per share)</a></td>
<td class="nump">$ 65.65<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_ClassOfWarrantOrRightAxis=dffn_TheMay2020InvestorWarrantExerciseMember', window );">The May 2020 Investor Warrant Exercise [Member]</a></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_us-gaap_ClassOfWarrantOrRightOutstanding', window );">Common stock warrants, outstanding (in shares) | shares</a></td>
<td class="nump">4,998<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_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1', window );">Range of exercise price (in dollars per share)</a></td>
<td class="nump">$ 29.7<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_ClassOfWarrantOrRightAxis=dffn_CommonStockWarrantsIssuedRelatedToFebruary2021CommonStockOfferingMember', window );">Common Stock Warrants Issued Related to February 2021 Common Stock Offering [Member]</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_us-gaap_ClassOfWarrantOrRightOutstanding', window );">Common stock warrants, outstanding (in shares) | shares</a></td>
<td class="nump">33,649<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_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1', window );">Range of exercise price (in dollars per share)</a></td>
<td class="nump">$ 64.08<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_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 https://asc.fasb.org/extlink&amp;oid=126973232&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_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_ClassOfWarrantOrRightAxis=dffn_WarrantsIssuedInConnectionWithTheJanuary2018OfferingMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.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_ClassOfWarrantOrRightAxis=dffn_WarrantsIssuedInConnectionWithTheJanuary2018OfferingMember</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_ClassOfWarrantOrRightAxis=dffn_WarrantsIssuedInConnectionWithMay2019PublicOfferingMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.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_ClassOfWarrantOrRightAxis=dffn_WarrantsIssuedInConnectionWithMay2019PublicOfferingMember</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_ClassOfWarrantOrRightAxis=dffn_WarrantsIssuedInConnectionWithTheNovember2019OfferingMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.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_ClassOfWarrantOrRightAxis=dffn_WarrantsIssuedInConnectionWithTheNovember2019OfferingMember</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_ClassOfWarrantOrRightAxis=dffn_WarrantsIssuedInConnectionWithTheDecember2019OfferingMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.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_ClassOfWarrantOrRightAxis=dffn_WarrantsIssuedInConnectionWithTheDecember2019OfferingMember</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_ClassOfWarrantOrRightAxis=dffn_CommonStockWarrantsIssuedRelatedToMay2020CommonStockOfferingMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.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_ClassOfWarrantOrRightAxis=dffn_CommonStockWarrantsIssuedRelatedToMay2020CommonStockOfferingMember</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_ClassOfWarrantOrRightAxis=dffn_TheMay2020InvestorWarrantExerciseMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.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_ClassOfWarrantOrRightAxis=dffn_TheMay2020InvestorWarrantExerciseMember</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_ClassOfWarrantOrRightAxis=dffn_CommonStockWarrantsIssuedRelatedToFebruary2021CommonStockOfferingMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.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_ClassOfWarrantOrRightAxis=dffn_CommonStockWarrantsIssuedRelatedToFebruary2021CommonStockOfferingMember</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>45
<FILENAME>R34.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;">v3.22.1</span><table class="report" border="0" cellspacing="2" id="idm140295877549752">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Note 8 - Stock-based Compensation (Details Textual) - USD ($)<br></strong></div></th>
<th class="th" colspan="1"></th>
<th class="th" colspan="2">3 Months Ended</th>
</tr>
<tr>
<th class="th"><div>Jan. 01, 2022</div></th>
<th class="th"><div>Mar. 31, 2022</div></th>
<th class="th"><div>Mar. 31, 2021</div></th>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue', window );">Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 10.90<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_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1', window );">Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested in Period, Fair Value</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 300,000<span></span>
</td>
<td class="nump">$ 200,000<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_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised', window );">Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares)</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">0<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_us-gaap_AllocatedShareBasedCompensationExpense', window );">Share-Based Payment Arrangement, Expense</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 278,131<span></span>
</td>
<td class="nump">181,280<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>
<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_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized', window );">Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 1,300,000<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_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1', window );">Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">1 year 11 months 19 days<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_RestrictedStockUnitsRSUMember', window );">Restricted Stock Units (RSUs) [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="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized', window );">Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 100,000<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_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1', window );">Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">1 year 10 months 24 days<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_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation', window );">Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares)</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">120<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_RestrictedStockUnitsRSUMember', window );">Restricted Stock Units (RSUs) [Member] | Director [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="re">
<td class="pl custom" 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 (Month)</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">18 months<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>
<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_us-gaap_AllocatedShareBasedCompensationExpense', window );">Share-Based Payment Arrangement, Expense</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 16,000<span></span>
</td>
<td class="nump">$ 5,000<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=dffn_EquityIncentivePlan2015Member', window );">Equity Incentive Plan 2015 [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="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dffn_PercentageOfTotalSharesEligibleForPlanReserveOnAnAnnualBasis', window );">Percentage of Total Shares Eligible for Plan Reserve, On an Annual Basis</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">4.00%<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_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized', window );">Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized (in shares)</a></td>
<td class="nump">81,531<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_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant', window );">Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">49,039<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_dffn_PercentageOfTotalSharesEligibleForPlanReserveOnAnAnnualBasis">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></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 percentage of total shares within the plan that may be added to the plan reserve, occurring on an annual basis.</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;">dffn_PercentageOfTotalSharesEligibleForPlanReserveOnAnAnnualBasis</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dffn_</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_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://www.xbrl.org/2003/role/disclosureRef<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 https://asc.fasb.org/extlink&amp;oid=128089324&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_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://www.xbrl.org/2003/role/disclosureRef<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 https://asc.fasb.org/extlink&amp;oid=128089324&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://www.xbrl.org/2003/role/disclosureRef<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 https://asc.fasb.org/extlink&amp;oid=128089324&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://www.xbrl.org/2003/role/exampleRef<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 https://asc.fasb.org/extlink&amp;oid=128089324&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>
</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_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></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 additional 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>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_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized</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_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 https://asc.fasb.org/extlink&amp;oid=128089324&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_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></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 grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.</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 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (d)(1)<br> -URI https://asc.fasb.org/extlink&amp;oid=128089324&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_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue</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_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></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 options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted 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/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (d)(2)<br> -URI https://asc.fasb.org/extlink&amp;oid=128089324&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_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1</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_SharesPaidForTaxWithholdingForShareBasedCompensation">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></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 used to settle grantee's tax withholding obligation 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>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_SharesPaidForTaxWithholdingForShareBasedCompensation</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://www.xbrl.org/2003/role/disclosureRef<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)(02)<br> -URI https://asc.fasb.org/extlink&amp;oid=128089324&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 https://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 https://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 https://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 https://asc.fasb.org/extlink&amp;oid=126973232&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_RestrictedStockUnitsRSUMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.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_RestrictedStockUnitsRSUMember</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=srt_DirectorMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.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=srt_DirectorMember</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_PlanNameAxis=dffn_EquityIncentivePlan2015Member">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.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=dffn_EquityIncentivePlan2015Member</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>46
<FILENAME>R35.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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</head>
<body>
<span style="display: none;">v3.22.1</span><table class="report" border="0" cellspacing="2" id="idm140295878756072">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Note 8 - Stock-based Compensation - Stock-based Compensation Expense (Details) - USD ($)<br></strong></div></th>
<th class="th" colspan="2">3 Months Ended</th>
</tr>
<tr>
<th class="th"><div>Mar. 31, 2022</div></th>
<th class="th"><div>Mar. 31, 2021</div></th>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AllocatedShareBasedCompensationExpense', window );">Stock-based compensation expense</a></td>
<td class="nump">$ 278,131<span></span>
</td>
<td class="nump">$ 181,280<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_IncomeStatementLocationAxis=us-gaap_ResearchAndDevelopmentExpenseMember', window );">Research and Development Expense [Member]</a></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_us-gaap_AllocatedShareBasedCompensationExpense', window );">Stock-based compensation expense</a></td>
<td class="nump">58,892<span></span>
</td>
<td class="nump">33,000<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_IncomeStatementLocationAxis=us-gaap_GeneralAndAdministrativeExpenseMember', window );">General and Administrative Expense [Member]</a></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_us-gaap_AllocatedShareBasedCompensationExpense', window );">Stock-based compensation expense</a></td>
<td class="nump">$ 219,239<span></span>
</td>
<td class="nump">$ 148,280<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_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://www.xbrl.org/2003/role/disclosureRef<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 https://asc.fasb.org/extlink&amp;oid=128089324&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_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>
</div>
</body>
</html>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>XML
<SEQUENCE>47
<FILENAME>R36.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;">v3.22.1</span><table class="report" border="0" cellspacing="2" id="idm140295877631144">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Note 8 - Stock-based Compensation - Stock Option Activity (Details)<br></strong></div></th>
<th class="th" colspan="1">3 Months Ended</th>
</tr>
<tr><th class="th">
<div>Mar. 31, 2021 </div>
<div>USD ($) </div>
<div>$ / shares </div>
<div>shares</div>
</th></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_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber', window );">Balance at January 1, 2022 (in shares) | shares</a></td>
<td class="nump">72,454<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_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice', window );">Balance at January 1, 2022 (in dollars per share) | $ / shares</a></td>
<td class="nump">$ 265.85<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_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross', window );">Granted (in shares) | shares</a></td>
<td class="nump">48,300<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_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice', window );">Granted, weighted-average exercise price (in dollars per share) | $ / shares</a></td>
<td class="nump">$ 12.00<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_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod', window );">Cancelled/forfeited (in shares) | shares</a></td>
<td class="num">(4,190)<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_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice', window );">Cancelled/forfeited, weighted-average exercise price (in dollars per share) | $ / shares</a></td>
<td class="nump">$ 75.33<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_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber', window );">Options outstanding, number (in shares) | shares</a></td>
<td class="nump">116,564<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_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice', window );">Options outstanding, weighted-average exercise price (in dollars per share) | $ / shares</a></td>
<td class="nump">$ 164.31<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_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2', window );">Options outstanding, weighted-average remaining contractual life (Year)</a></td>
<td class="text">8 years 10 months 20 days<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_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue', window );">Options outstanding, aggregate intrinsic value | $</a></td>
<td class="nump">$ 23,163<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_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber', window );">Exercisable (in shares) | shares</a></td>
<td class="nump">52,849<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_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice', window );">Exercisable, weighted-average exercise price (in dollars per share) | $ / shares</a></td>
<td class="nump">$ 346.79<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_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1', window );">Exercisable, weighted-average remaining contractual life (Year)</a></td>
<td class="text">8 years 1 month 17 days<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_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1', window );">Exercisable, aggregate intrinsic value | $</a></td>
<td class="nump">$ 1,956<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_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber', window );">Vested and expected to vest (in shares) | shares</a></td>
<td class="nump">116,564<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_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice', window );">Vested and expected to vest, weighted-average exercise price (in dollars per share) | $ / shares</a></td>
<td class="nump">$ 164.31<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_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageRemainingContractualTerm1', window );">Vested and expected to vest, weighted-average remaining contractual life (Year)</a></td>
<td class="text">8 years 10 months 20 days<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_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue', window );">Vested and expected to vest, aggregate intrinsic value | $</a></td>
<td class="nump">$ 23,163<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_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://www.xbrl.org/2003/role/disclosureRef<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 https://asc.fasb.org/extlink&amp;oid=128089324&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://www.xbrl.org/2003/role/disclosureRef<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 https://asc.fasb.org/extlink&amp;oid=128089324&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_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></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 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.</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 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (c)(1)(iv)(03)<br> -URI https://asc.fasb.org/extlink&amp;oid=128089324&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_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod</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_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Gross 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://www.xbrl.org/2003/role/disclosureRef<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)(01)<br> -URI https://asc.fasb.org/extlink&amp;oid=128089324&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_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross</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 https://asc.fasb.org/extlink&amp;oid=128089324&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://www.xbrl.org/2003/role/disclosureRef<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 https://asc.fasb.org/extlink&amp;oid=128089324&amp;loc=d3e5070-113901<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 50<br> -Paragraph 2<br> -Subparagraph (c)(1)(i)<br> -URI https://asc.fasb.org/extlink&amp;oid=128089324&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://www.xbrl.org/2003/role/disclosureRef<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 https://asc.fasb.org/extlink&amp;oid=128089324&amp;loc=d3e5070-113901<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 50<br> -Paragraph 2<br> -Subparagraph (c)(1)(i)<br> -URI https://asc.fasb.org/extlink&amp;oid=128089324&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_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></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 current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.</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 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (e)(1)<br> -URI https://asc.fasb.org/extlink&amp;oid=128089324&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_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue</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_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></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 fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.</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 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (e)(1)<br> -URI https://asc.fasb.org/extlink&amp;oid=128089324&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_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber</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_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></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 exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.</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 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (e)(1)<br> -URI https://asc.fasb.org/extlink&amp;oid=128089324&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_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice</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_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></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 could have acquired the underlying shares with respect to stock options that were terminated.</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 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (c)(1)(iv)(03)<br> -URI https://asc.fasb.org/extlink&amp;oid=128089324&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_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice</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>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<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)(01)<br> -URI https://asc.fasb.org/extlink&amp;oid=128089324&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_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_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 https://asc.fasb.org/extlink&amp;oid=128089324&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 https://asc.fasb.org/extlink&amp;oid=128089324&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 https://asc.fasb.org/extlink&amp;oid=128089324&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_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageRemainingContractualTerm1">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></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 fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.</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 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (e)(1)<br> -URI https://asc.fasb.org/extlink&amp;oid=128089324&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_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageRemainingContractualTerm1</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>
</div>
</body>
</html>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>XML
<SEQUENCE>48
<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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</head>
<body>
<span style="display: none;">v3.22.1</span><table class="report" border="0" cellspacing="2" id="idm140295881517992">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Note 8 - Stock-based Compensation - Fair Value Assumptions (Details) - Share-Based Payment Arrangement, Option [Member]<br></strong></div></th>
<th class="th" colspan="1">3 Months Ended</th>
</tr>
<tr><th class="th"><div>Mar. 31, 2022</div></th></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_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1', window );">Expected term (Year)</a></td>
<td class="text">5 years 8 months 12 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_us-gaap_AwardTypeAxis=us-gaap_EmployeeStockOptionMember', window );">Minimum [Member]</a></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_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate', window );">Risk-free interest rate</a></td>
<td class="nump">1.70%<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_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate', window );">Expected volatility</a></td>
<td class="nump">134.70%<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_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></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 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>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (f)(2)(ii)<br> -URI https://asc.fasb.org/extlink&amp;oid=128089324&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_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate</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_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></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 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>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (f)(2)(iv)<br> -URI https://asc.fasb.org/extlink&amp;oid=128089324&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_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate</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_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://www.xbrl.org/2003/role/disclosureRef<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 https://asc.fasb.org/extlink&amp;oid=128089324&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_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1</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_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_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>
</div>
</body>
</html>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>XML
<SEQUENCE>49
<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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							e.nextSibling.style.display='block';
							} else { e.nextSibling.style.display='none'; }
							}</script>
</head>
<body>
<span style="display: none;">v3.22.1</span><table class="report" border="0" cellspacing="2" id="idm140295881642424">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Note 8 - Stock-based Compensation - RSU Stock-based Payment Awards (Details) - Restricted Stock Units (RSUs) [Member]<br></strong></div></th>
<th class="th" colspan="2">3 Months Ended</th>
</tr>
<tr><th class="th" colspan="2">
<div>Mar. 31, 2022 </div>
<div>$ / shares </div>
<div>shares</div>
</th></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_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber', window );">Unvested, shares (in shares) | shares</a></td>
<td class="nump">5,509<span></span>
</td>
<td class="fn" style="border-bottom: 0px;"></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_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue', window );">Unvested, Weighted-average grant date fair value (in dollars per share) | $ / shares</a></td>
<td class="nump">$ 34.78<span></span>
</td>
<td class="fn" style="border-bottom: 0px;"></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_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod', window );">Vested, shars (in shares) | shares</a></td>
<td class="num">(327)<span></span>
</td>
<td class="fn" style="border-bottom: 0px;"><sup>[1]</sup></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_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue', window );">Vested, Weighted-average grant date fair value (in dollars per share) | $ / shares</a></td>
<td class="nump">$ 25.50<span></span>
</td>
<td class="fn" style="border-bottom: 0px;"></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_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber', window );">Unvested, shares (in shares) | shares</a></td>
<td class="nump">5,182<span></span>
</td>
<td class="fn" style="border-bottom: 0px;"></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_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue', window );">Unvested, Weighted-average grant date fair value (in dollars per share) | $ / shares</a></td>
<td class="nump">$ 35.36<span></span>
</td>
<td class="fn" style="border-bottom: 0px;"></td>
</tr>
<tr><td colspan="3"></td></tr>
<tr><td colspan="3"><table class="outerFootnotes" width="100%"><tr class="outerFootnote">
<td style="vertical-align: top; width: 12pt;" valign="top">[1]</td>
<td style="vertical-align: top;" valign="top">The RSUs vested during the three months ended March 31, 2022 were settled on a hybrid basis. The Company withheld 120 shares of common stock and, in lieu of delivering such shares, paid the RSU holder an amount in cash equal to the fair market value of such shares on vesting date, representing the holder's approximate tax liability associated with such vesting amount in cash equal to the fair market value of such shares on vesting date, representing the holder's approximate tax liability associated with such vesting.</td>
</tr></table></td></tr>
</table>
<div style="display: none;">
<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://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (c)(2)(ii)<br> -URI https://asc.fasb.org/extlink&amp;oid=128089324&amp;loc=d3e5070-113901<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 50<br> -Paragraph 2<br> -Subparagraph (c)(2)(i)<br> -URI https://asc.fasb.org/extlink&amp;oid=128089324&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://www.xbrl.org/2003/role/disclosureRef<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)<br> -URI https://asc.fasb.org/extlink&amp;oid=128089324&amp;loc=d3e5070-113901<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 50<br> -Paragraph 2<br> -Subparagraph (c)(2)(ii)<br> -URI https://asc.fasb.org/extlink&amp;oid=128089324&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://www.xbrl.org/2003/role/disclosureRef<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)(02)<br> -URI https://asc.fasb.org/extlink&amp;oid=128089324&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://www.xbrl.org/2003/role/disclosureRef<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)(02)<br> -URI https://asc.fasb.org/extlink&amp;oid=128089324&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_AwardTypeAxis=us-gaap_RestrictedStockUnitsRSUMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.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_RestrictedStockUnitsRSUMember</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>
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</DOCUMENT>
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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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<body>
<span style="display: none;">v3.22.1</span><table class="report" border="0" cellspacing="2" id="idm140295881602936">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Note 9 - Commitments and Contingencies (Details Textual) - USD ($)<br></strong></div></th>
<th class="th" colspan="2">3 Months Ended</th>
</tr>
<tr>
<th class="th"><div>Mar. 31, 2022</div></th>
<th class="th"><div>Mar. 31, 2021</div></th>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OperatingLeasePayments', window );">Operating Lease, Payments</a></td>
<td class="nump">$ 9,000<span></span>
</td>
<td class="nump">$ 31,000<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_us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent', window );">Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent</a></td>
<td class="nump">90.00%<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_us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent', window );">Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay</a></td>
<td class="nump">4.00%<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_us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount', window );">Defined Contribution Plan, Employer Discretionary Contribution Amount</a></td>
<td class="nump">$ 27,000<span></span>
</td>
<td class="nump">$ 16,000<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_DefinedContributionPlanEmployerDiscretionaryContributionAmount">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></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 discretionary contributions made by an employer to a defined contribution 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;">us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount</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_DefinedContributionPlanEmployerMatchingContributionPercent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></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 employees' gross pay for which the employer contributes a matching contribution to a defined contribution 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;">us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent</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_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></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 percentage of employee gross pay the employee may contribute to a defined contribution 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;">us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent</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_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 https://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 https://asc.fasb.org/extlink&amp;oid=128292326&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>
</div>
</body>
</html>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>XML
<SEQUENCE>51
<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;">v3.22.1</span><table class="report" border="0" cellspacing="2" id="idm140295877995096">
<tr>
<th class="tl" colspan="1" rowspan="1"><div style="width: 200px;"><strong>Note 10 - Subsequent Events (Details Textual) - Subsequent Event [Member]<br></strong></div></th>
<th class="th">
<div>Apr. 18, 2022 </div>
<div>shares</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_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember', window );">Conversion of Series C Preferred Stock into Common Stock [Member]</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_us-gaap_ConversionOfStockSharesConverted1', window );">Conversion of Stock, Shares Converted (in shares)</a></td>
<td class="nump">10,000<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_us-gaap_ConversionOfStockSharesIssued1', window );">Conversion of Stock, Shares Issued (in shares)</a></td>
<td class="nump">200<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_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember', window );">Reverse Stock Split [Member ]</a></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_us-gaap_StockholdersEquityNoteStockSplitConversionRatio1', window );">Stockholders' Equity Note, Stock Split, Conversion Ratio</a></td>
<td class="nump">50<span></span>
</td>
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   &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;"&gt;On &lt;em style="font: inherit;"&gt; April 18, 2022, &lt;/em&gt;the Company effected a &lt;em style="font: inherit;"&gt;1&lt;/em&gt;-for-50 reverse split of its common stock. Any references in the unaudited condensed consolidated financial statements and related notes to share or per share amounts give retroactive effect to this reverse stock split.&lt;/p&gt;
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   &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;"&gt;The Company has &lt;em style="font: inherit;"&gt;not&lt;/em&gt; generated any revenues from product sales and has funded operations primarily from the proceeds of public and private offerings of equity, convertible debt and convertible preferred stock. Substantial additional financing will be required by the Company to continue to fund its research and development activities. &lt;em style="font: inherit;"&gt;No&lt;/em&gt; assurance can be given that any such financing will be available when needed, or at all, or that the Company&#x2019;s research and development efforts will be successful.&lt;/p&gt;
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   &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;"&gt;The Company regularly explores alternative means of financing its operations and seeks funding through various sources, including public and private securities offerings, collaborative arrangements with &lt;em style="font: inherit;"&gt;third&lt;/em&gt; parties and other strategic alliances and business transactions. The Company does &lt;em style="font: inherit;"&gt;not&lt;/em&gt; have any commitments to obtain additional funds and &lt;em style="font: inherit;"&gt; may &lt;/em&gt;be unable to obtain sufficient funding in the future on acceptable terms, if at all. If the Company cannot obtain the necessary funding, it will need to delay, scale back or eliminate some or all of its research and development programs or enter into collaborations with &lt;em style="font: inherit;"&gt;third&lt;/em&gt; parties to commercialize potential products or technologies that it might otherwise seek to develop or commercialize independently; consider other various strategic alternatives, including a merger or sale of the Company; or cease operations. If the Company engages in collaborations, it &lt;em style="font: inherit;"&gt; may &lt;/em&gt;receive lower consideration upon commercialization of such products than if it had &lt;em style="font: inherit;"&gt;not&lt;/em&gt; entered such arrangements or if it entered into such arrangements at later stages in the product development process.&lt;/p&gt;
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   &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;"&gt;Operations of the Company are subject to certain risks and uncertainties including various internal and external factors that will affect whether and when the Company&#x2019;s product candidates become approved drugs and how significant their market share will be, some of which are outside of the Company&#x2019;s control. The length of time and cost of developing and commercializing these product candidates and/or failure of them at any stage of the drug approval process will materially affect the Company&#x2019;s financial condition and future operations. The Company expects that its existing cash, cash equivalents and marketable securities as of &lt;em style="font: inherit;"&gt; March&#160;&lt;/em&gt;&lt;em style="font: inherit;"&gt;31,&lt;/em&gt; &lt;em style="font: inherit;"&gt;2022&lt;/em&gt; will enable it to fund its operating expenses and capital expenditure requirements through &lt;em style="font: inherit;"&gt;2023.&lt;/em&gt;&lt;/p&gt;
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   &lt;p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"&gt;&#160;&lt;/p&gt;
   &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;"&gt;As of the date of this Quarterly Report, the Summary of Significant Accounting Policies included in the Company's Annual Report have &lt;em style="font: inherit;"&gt;not&lt;/em&gt; materially changed, except as set forth below.&lt;/p&gt;
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   &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;"&gt;The accompanying unaudited interim&#160;consolidated&#160;financial statements of the Company have been prepared in accordance with GAAP for interim financial information as found in the ASC and ASUs of the FASB, and with the instructions to Form &lt;em style="font: inherit;"&gt;10&lt;/em&gt;-Q and Article &lt;em style="font: inherit;"&gt;10&lt;/em&gt; of Regulation S-&lt;em style="font: inherit;"&gt;X&lt;/em&gt; promulgated by the SEC. In the opinion of management, the accompanying&#160;unaudited interim consolidated financial statements of the Company include all normal and recurring adjustments (which consist primarily of accruals, estimates and assumptions that impact the unaudited interim consolidated financial statements) considered necessary to present fairly the Company&#x2019;s financial position as of&#160;&lt;em style="font: inherit;"&gt; March&#160;&lt;/em&gt;&lt;em style="font: inherit;"&gt;31,&lt;/em&gt; &lt;em style="font: inherit;"&gt;2022,&lt;/em&gt; and its results of operations and cash flows for the &lt;em style="font: inherit;"&gt;three&lt;/em&gt; months ended &lt;em style="font: inherit;"&gt; March&#160;&lt;/em&gt;&lt;em style="font: inherit;"&gt;31,&lt;/em&gt; &lt;em style="font: inherit;"&gt;2022&lt;/em&gt; and &lt;em style="font: inherit;"&gt;2021.&lt;/em&gt; Operating results for the &lt;em style="font: inherit;"&gt;three&lt;/em&gt; months ended&#160;&lt;em style="font: inherit;"&gt; March&#160;&lt;/em&gt;&lt;em style="font: inherit;"&gt;31,&lt;/em&gt; &lt;em style="font: inherit;"&gt;2022&lt;/em&gt; are &lt;em style="font: inherit;"&gt;not&lt;/em&gt; necessarily indicative of the results that &lt;em style="font: inherit;"&gt; may &lt;/em&gt;be expected for the year ending &lt;em style="font: inherit;"&gt; December&#160;&lt;/em&gt;&lt;em style="font: inherit;"&gt;31,&lt;/em&gt; &lt;em style="font: inherit;"&gt;2022.&lt;/em&gt; The unaudited interim&#160;consolidated&#160;financial statements presented herein do &lt;em style="font: inherit;"&gt;not&lt;/em&gt; contain the required disclosures under GAAP for annual financial statements. The accompanying&#160;unaudited interim consolidated&#160;financial statements should be read in conjunction with the annual audited financial statements and related notes as of and for the year ended &lt;em style="font: inherit;"&gt; December&#160;&lt;/em&gt;&lt;em style="font: inherit;"&gt;31,&lt;/em&gt; &lt;em style="font: inherit;"&gt;2021&lt;/em&gt; filed with the SEC as part of the Annual Report.&lt;/p&gt;
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   &lt;p style="font-family: &amp;quot;Times New Roman&amp;quot;; font-size: 10pt; font-variant: normal; margin: 0pt; text-align: justify; text-indent: 45pt;"&gt;&#160;&lt;/p&gt;
   &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;"&gt;The preparation of financial statements in conformity with GAAP requires the Company to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of expenses during the reporting period.&lt;/p&gt;
   &lt;p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"&gt;&#160;&lt;/p&gt;
   &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;"&gt;On an ongoing basis, the Company evaluates its estimates using historical experience and other factors, including the current economic environment. Significant items subject to such estimates are assumptions used for purposes of determining stock-based compensation and accounting for research and development activities. Management believes its estimates to be reasonable under the circumstances. Actual results could differ significantly from those estimates.&lt;/p&gt;
   &lt;p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"&gt;&#160;&lt;/p&gt;&lt;p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"/&gt;
   &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 9pt;"&gt;&lt;i/&gt;&lt;/p&gt;&lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 9pt;"&gt;&lt;i&gt;Fair Value of Financial Instruments&lt;/i&gt;&lt;/p&gt;
   &lt;p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"&gt;&#160;&lt;/p&gt;
   &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;"&gt;The carrying amounts of the Company&#x2019;s financial instruments, including cash equivalents and accounts payable approximate fair value due to the short-term nature of those instruments.&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&lt;/p&gt;
   &lt;p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"&gt;&#160;&lt;/p&gt;&lt;p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"/&gt;
   &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 9pt;"&gt;&lt;i/&gt;&lt;/p&gt;&lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 9pt;"&gt;&lt;i&gt;Concentration of Credit Risk&lt;/i&gt;&lt;/p&gt;
   &lt;p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"&gt;&#160;&lt;/p&gt;
   &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;"&gt;Financial instruments that potentially expose the Company to concentrations of credit risk consist principally of cash on deposit with multiple financial institutions, the balances of which frequently exceed federally insured limits.&lt;/p&gt;
   &lt;p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"&gt;&#160;&lt;/p&gt;&lt;p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"/&gt;
   &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 9pt;"&gt;&lt;i/&gt;&lt;/p&gt;&lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 9pt;"&gt;&lt;i&gt;Cash and Cash Equivalents&lt;/i&gt;&lt;/p&gt;
   &lt;p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"&gt;&#160;&lt;/p&gt;
   &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;"&gt;The Company considers any highly-liquid investments, such as money market funds and commercial paper with an original maturity of &lt;em style="font: inherit;"&gt;three&lt;/em&gt; months or less to be cash and cash equivalents.&lt;/p&gt;
   &lt;p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"&gt;&#160;&lt;/p&gt;&lt;p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"/&gt;
   &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 9pt;"&gt;&lt;i/&gt;&lt;/p&gt;&lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 9pt;"&gt;&lt;i&gt;Marketable securities&lt;/i&gt;&lt;/p&gt;
   &lt;p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"&gt;&#160;&lt;/p&gt;
   &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;"&gt;The Company classifies its marketable securities as available-for-sale, which include commercial paper and U.S. government debt securities with original maturities of greater than &lt;em style="font: inherit;"&gt;three&lt;/em&gt; months from date of purchase. The Company considers its marketable securities as available for use in current operations, and therefore classify these securities as current assets on the consolidated balance sheet. These securities are carried at fair market value, with unrealized gains and losses reported in comprehensive loss and accumulated other comprehensive loss within stockholders&#x2019; equity. Gains or losses on marketable securities sold will be based on the specific identification method.&lt;/p&gt;
   &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt;text-indent:9pt;"&gt;&#160;&lt;/p&gt;&lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt;text-indent:9pt;"/&gt;
   &lt;p style="font-family: 'Times New Roman', Times, serif; font-size: 10pt; margin: 0pt; text-align: left"/&gt;
   &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt;"&gt;&lt;i/&gt;&lt;/p&gt;&lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt;"&gt;&lt;i&gt;Reverse Stock Split&lt;/i&gt;&lt;/p&gt;
   &lt;p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"&gt;&#160;&lt;/p&gt;
   &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;"&gt;On &lt;em style="font: inherit;"&gt; April 18, 2022, &lt;/em&gt;the Company filed a Certificate of Amendment to its Certificate of Incorporation, as amended, with the Secretary of State of the State of Delaware to effect the Reverse Stock Split at a ratio of &lt;em style="font: inherit;"&gt;1&lt;/em&gt;-to-50. No fractional shares were issued in connection with the Reverse Stock Split. Stockholders who otherwise would have been entitled to receive fractional shares of common stock are entitled to receive an amount in cash (without interest or deduction) equal to the fraction of &lt;em style="font: inherit;"&gt;one&lt;/em&gt; share to which such stockholder would otherwise be entitled multiplied by $12.93, representing the split-adjusted average closing price of the Company&#x2019;s common stock on the Nasdaq Capital Market for the &lt;em style="font: inherit;"&gt;five&lt;/em&gt; consecutive trading days immediately preceding the effective date of the Reverse Stock Split. Proportional adjustments were made to the Company&#x2019;s outstanding warrants, stock options and other equity securities and to the &lt;em style="font: inherit;"&gt;2015&lt;/em&gt; Equity Plan to reflect the Reverse Stock Split, in each case, in accordance with the terms thereof. Unless the context otherwise requires, all share and per share amounts in this Quarterly Report have been adjusted to reflect the Reverse Stock Split.&lt;/p&gt;
   &lt;p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"&gt;&#160;&lt;/p&gt;&lt;p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"/&gt;
   &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt;"&gt;&lt;i/&gt;&lt;/p&gt;&lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt;"&gt;&lt;i&gt;Net Loss Per Common Share&lt;/i&gt;&lt;/p&gt;
   &lt;p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"&gt;&#160;&lt;/p&gt;
   &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;"&gt;Basic net loss per share is computed by dividing net loss attributable to common stockholders by the weighted average number of shares of common stock outstanding during each period. Diluted net loss per share includes the effect, if any, from the potential exercise or conversion of securities, such as convertible debt, convertible preferred stock, common stock warrants, stock options and unvested restricted stock that would result in the issuance of incremental shares of common stock. In computing the basic and diluted net loss per share applicable to common stockholders, the weighted average number of shares remains the same for both calculations due to the fact that when a net loss exists, dilutive shares are &lt;em style="font: inherit;"&gt;not&lt;/em&gt; included in the calculation as the impact is anti-dilutive.&lt;/p&gt;
   &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt;text-indent:36pt;"&gt;&#160;&lt;/p&gt;
   &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;"&gt;The following potentially dilutive securities outstanding as of &lt;em style="font: inherit;"&gt; March&#160;&lt;/em&gt;&lt;em style="font: inherit;"&gt;31,&lt;/em&gt; &lt;em style="font: inherit;"&gt;2022&lt;/em&gt; and &lt;em style="font: inherit;"&gt;2021&lt;/em&gt; have been excluded from the computation of diluted weighted average shares outstanding, as they would be anti-dilutive:&lt;/p&gt;
   &lt;p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"&gt;&#160;&lt;/p&gt;

     &lt;table border="0" cellpadding="0" cellspacing="0" class="finTable" style="width: 100%; font-size: 10pt; font-family: Times New Roman; text-indent: 0px;"&gt;&lt;tbody&gt;&lt;tr style="vertical-align: bottom;"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td colspan="6" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;&lt;b&gt;&lt;b&gt;March 31,&lt;/b&gt;&lt;/b&gt;&lt;/p&gt; &lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom;"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td colspan="2" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;&lt;b&gt;&lt;b&gt;2022&lt;/b&gt;&lt;/b&gt;&lt;/p&gt; &lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td colspan="2" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;&lt;b&gt;&lt;b&gt;2021&lt;/b&gt;&lt;/b&gt;&lt;/p&gt; &lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 70%;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"&gt;Common stock warrants&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;111,891&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;112,963&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"&gt;Stock options&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;116,564&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;62,336&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"&gt;Unvested restricted stock awards&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;&#160;&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;5,182&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;&#160;&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;3,060&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;&#160;&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;233,637&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;&#160;&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;178,359&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;/tbody&gt;&lt;/table&gt;

   &lt;p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"&gt;&#160;&lt;/p&gt;&lt;p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"/&gt;
   &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt;"&gt;&lt;b&gt;&lt;i/&gt;&lt;/b&gt;&lt;/p&gt;&lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt;"&gt;&lt;b&gt;&lt;i&gt;Recently Adopted Accounting Pronouncements&lt;/i&gt;&lt;/b&gt;&lt;/p&gt;
   &lt;p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"&gt;&#160;&lt;/p&gt;
   &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;"&gt;In &lt;em style="font: inherit;"&gt; June 2016, &lt;/em&gt;the FASB issued ASU &lt;em style="font: inherit;"&gt;2016&lt;/em&gt;-&lt;em style="font: inherit;"&gt;13,&lt;/em&gt; &lt;i&gt;Financial Instruments&lt;/i&gt;&#x2014;&lt;i&gt;Credit Losses, Measurement of Credit Losses on Financial Instruments&lt;/i&gt; (Topic &lt;em style="font: inherit;"&gt;326&lt;/em&gt;). The standard amends the impairment model by requiring entities to use a forward-looking approach based on expected losses to estimate credit losses for most financial assets and certain other instruments that aren&#x2019;t measured at fair value through net income. For available-for-sale debt securities, entities will be required to recognize an allowance for credit losses rather than a reduction in carrying value of the asset. Entities will &lt;em style="font: inherit;"&gt;no&lt;/em&gt; longer be permitted to consider the length of time that fair value has been less than amortized cost when evaluating when credit losses should be recognized. This new guidance is effective for the Company as of &lt;em style="font: inherit;"&gt; January 1, 2023. &lt;/em&gt;The Company is currently evaluating the impact of this ASU but&#160;does&#160;&lt;em style="font: inherit;"&gt;not&lt;/em&gt;&#160;expect that adoption of this standard will have a material impact on the consolidated financial statements and related disclosures.&lt;/p&gt;
   &lt;p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"&gt;&#160;&lt;/p&gt;&lt;p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"/&gt;&lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt 0pt 0pt 8pt;"&gt;&lt;b/&gt;&lt;/p&gt;
  </us-gaap:SignificantAccountingPoliciesTextBlock>
    <us-gaap:BasisOfAccountingPolicyPolicyTextBlock contextRef="d_2022-01-01_2022-03-31" id="c84241613">&lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin: 0pt; text-indent: 9pt;"&gt;&lt;i&gt;Basis of Presentation&lt;/i&gt;&lt;/p&gt;
   &lt;p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"&gt;&#160;&lt;/p&gt;
   &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;"&gt;The accompanying unaudited interim&#160;consolidated&#160;financial statements of the Company have been prepared in accordance with GAAP for interim financial information as found in the ASC and ASUs of the FASB, and with the instructions to Form &lt;em style="font: inherit;"&gt;10&lt;/em&gt;-Q and Article &lt;em style="font: inherit;"&gt;10&lt;/em&gt; of Regulation S-&lt;em style="font: inherit;"&gt;X&lt;/em&gt; promulgated by the SEC. In the opinion of management, the accompanying&#160;unaudited interim consolidated financial statements of the Company include all normal and recurring adjustments (which consist primarily of accruals, estimates and assumptions that impact the unaudited interim consolidated financial statements) considered necessary to present fairly the Company&#x2019;s financial position as of&#160;&lt;em style="font: inherit;"&gt; March&#160;&lt;/em&gt;&lt;em style="font: inherit;"&gt;31,&lt;/em&gt; &lt;em style="font: inherit;"&gt;2022,&lt;/em&gt; and its results of operations and cash flows for the &lt;em style="font: inherit;"&gt;three&lt;/em&gt; months ended &lt;em style="font: inherit;"&gt; March&#160;&lt;/em&gt;&lt;em style="font: inherit;"&gt;31,&lt;/em&gt; &lt;em style="font: inherit;"&gt;2022&lt;/em&gt; and &lt;em style="font: inherit;"&gt;2021.&lt;/em&gt; Operating results for the &lt;em style="font: inherit;"&gt;three&lt;/em&gt; months ended&#160;&lt;em style="font: inherit;"&gt; March&#160;&lt;/em&gt;&lt;em style="font: inherit;"&gt;31,&lt;/em&gt; &lt;em style="font: inherit;"&gt;2022&lt;/em&gt; are &lt;em style="font: inherit;"&gt;not&lt;/em&gt; necessarily indicative of the results that &lt;em style="font: inherit;"&gt; may &lt;/em&gt;be expected for the year ending &lt;em style="font: inherit;"&gt; December&#160;&lt;/em&gt;&lt;em style="font: inherit;"&gt;31,&lt;/em&gt; &lt;em style="font: inherit;"&gt;2022.&lt;/em&gt; The unaudited interim&#160;consolidated&#160;financial statements presented herein do &lt;em style="font: inherit;"&gt;not&lt;/em&gt; contain the required disclosures under GAAP for annual financial statements. The accompanying&#160;unaudited interim consolidated&#160;financial statements should be read in conjunction with the annual audited financial statements and related notes as of and for the year ended &lt;em style="font: inherit;"&gt; December&#160;&lt;/em&gt;&lt;em style="font: inherit;"&gt;31,&lt;/em&gt; &lt;em style="font: inherit;"&gt;2021&lt;/em&gt; filed with the SEC as part of the Annual Report.&lt;/p&gt;
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    <us-gaap:UseOfEstimates contextRef="d_2022-01-01_2022-03-31" id="c84241614">&lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 9pt;"&gt;&lt;i&gt;Use of Estimates&lt;/i&gt;&lt;/p&gt;
   &lt;p style="font-family: &amp;quot;Times New Roman&amp;quot;; font-size: 10pt; font-variant: normal; margin: 0pt; text-align: justify; text-indent: 45pt;"&gt;&#160;&lt;/p&gt;
   &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;"&gt;The preparation of financial statements in conformity with GAAP requires the Company to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of expenses during the reporting period.&lt;/p&gt;
   &lt;p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"&gt;&#160;&lt;/p&gt;
   &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;"&gt;On an ongoing basis, the Company evaluates its estimates using historical experience and other factors, including the current economic environment. Significant items subject to such estimates are assumptions used for purposes of determining stock-based compensation and accounting for research and development activities. Management believes its estimates to be reasonable under the circumstances. Actual results could differ significantly from those estimates.&lt;/p&gt;
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    <us-gaap:FairValueOfFinancialInstrumentsPolicy contextRef="d_2022-01-01_2022-03-31" id="c84241615">&lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 9pt;"&gt;&lt;i&gt;Fair Value of Financial Instruments&lt;/i&gt;&lt;/p&gt;
   &lt;p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"&gt;&#160;&lt;/p&gt;
   &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;"&gt;The carrying amounts of the Company&#x2019;s financial instruments, including cash equivalents and accounts payable approximate fair value due to the short-term nature of those instruments.&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&lt;/p&gt;
   &lt;p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"&gt;&#160;&lt;/p&gt;</us-gaap:FairValueOfFinancialInstrumentsPolicy>
    <us-gaap:ConcentrationRiskCreditRisk contextRef="d_2022-01-01_2022-03-31" id="c84241616">&lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 9pt;"&gt;&lt;i&gt;Concentration of Credit Risk&lt;/i&gt;&lt;/p&gt;
   &lt;p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"&gt;&#160;&lt;/p&gt;
   &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;"&gt;Financial instruments that potentially expose the Company to concentrations of credit risk consist principally of cash on deposit with multiple financial institutions, the balances of which frequently exceed federally insured limits.&lt;/p&gt;
   &lt;p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"&gt;&#160;&lt;/p&gt;</us-gaap:ConcentrationRiskCreditRisk>
    <us-gaap:CashAndCashEquivalentsPolicyTextBlock contextRef="d_2022-01-01_2022-03-31" id="c84241617">&lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 9pt;"&gt;&lt;i&gt;Cash and Cash Equivalents&lt;/i&gt;&lt;/p&gt;
   &lt;p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"&gt;&#160;&lt;/p&gt;
   &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;"&gt;The Company considers any highly-liquid investments, such as money market funds and commercial paper with an original maturity of &lt;em style="font: inherit;"&gt;three&lt;/em&gt; months or less to be cash and cash equivalents.&lt;/p&gt;
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    <us-gaap:MarketableSecuritiesPolicy contextRef="d_2022-01-01_2022-03-31" id="c84241618">&lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 9pt;"&gt;&lt;i&gt;Marketable securities&lt;/i&gt;&lt;/p&gt;
   &lt;p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"&gt;&#160;&lt;/p&gt;
   &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;"&gt;The Company classifies its marketable securities as available-for-sale, which include commercial paper and U.S. government debt securities with original maturities of greater than &lt;em style="font: inherit;"&gt;three&lt;/em&gt; months from date of purchase. The Company considers its marketable securities as available for use in current operations, and therefore classify these securities as current assets on the consolidated balance sheet. These securities are carried at fair market value, with unrealized gains and losses reported in comprehensive loss and accumulated other comprehensive loss within stockholders&#x2019; equity. Gains or losses on marketable securities sold will be based on the specific identification method.&lt;/p&gt;
   &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt;text-indent:9pt;"&gt;&#160;&lt;/p&gt;</us-gaap:MarketableSecuritiesPolicy>
    <us-gaap:StockholdersEquityPolicyTextBlock contextRef="d_2022-01-01_2022-03-31" id="c84241619">&lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt;"&gt;&lt;i&gt;Reverse Stock Split&lt;/i&gt;&lt;/p&gt;
   &lt;p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"&gt;&#160;&lt;/p&gt;
   &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;"&gt;On &lt;em style="font: inherit;"&gt; April 18, 2022, &lt;/em&gt;the Company filed a Certificate of Amendment to its Certificate of Incorporation, as amended, with the Secretary of State of the State of Delaware to effect the Reverse Stock Split at a ratio of &lt;em style="font: inherit;"&gt;1&lt;/em&gt;-to-50. No fractional shares were issued in connection with the Reverse Stock Split. Stockholders who otherwise would have been entitled to receive fractional shares of common stock are entitled to receive an amount in cash (without interest or deduction) equal to the fraction of &lt;em style="font: inherit;"&gt;one&lt;/em&gt; share to which such stockholder would otherwise be entitled multiplied by $12.93, representing the split-adjusted average closing price of the Company&#x2019;s common stock on the Nasdaq Capital Market for the &lt;em style="font: inherit;"&gt;five&lt;/em&gt; consecutive trading days immediately preceding the effective date of the Reverse Stock Split. Proportional adjustments were made to the Company&#x2019;s outstanding warrants, stock options and other equity securities and to the &lt;em style="font: inherit;"&gt;2015&lt;/em&gt; Equity Plan to reflect the Reverse Stock Split, in each case, in accordance with the terms thereof. Unless the context otherwise requires, all share and per share amounts in this Quarterly Report have been adjusted to reflect the Reverse Stock Split.&lt;/p&gt;
   &lt;p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"&gt;&#160;&lt;/p&gt;</us-gaap:StockholdersEquityPolicyTextBlock>
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   &lt;p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"&gt;&#160;&lt;/p&gt;
   &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;"&gt;Basic net loss per share is computed by dividing net loss attributable to common stockholders by the weighted average number of shares of common stock outstanding during each period. Diluted net loss per share includes the effect, if any, from the potential exercise or conversion of securities, such as convertible debt, convertible preferred stock, common stock warrants, stock options and unvested restricted stock that would result in the issuance of incremental shares of common stock. In computing the basic and diluted net loss per share applicable to common stockholders, the weighted average number of shares remains the same for both calculations due to the fact that when a net loss exists, dilutive shares are &lt;em style="font: inherit;"&gt;not&lt;/em&gt; included in the calculation as the impact is anti-dilutive.&lt;/p&gt;
   &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt;text-indent:36pt;"&gt;&#160;&lt;/p&gt;
   &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;"&gt;The following potentially dilutive securities outstanding as of &lt;em style="font: inherit;"&gt; March&#160;&lt;/em&gt;&lt;em style="font: inherit;"&gt;31,&lt;/em&gt; &lt;em style="font: inherit;"&gt;2022&lt;/em&gt; and &lt;em style="font: inherit;"&gt;2021&lt;/em&gt; have been excluded from the computation of diluted weighted average shares outstanding, as they would be anti-dilutive:&lt;/p&gt;
   &lt;p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"&gt;&#160;&lt;/p&gt;

     &lt;table border="0" cellpadding="0" cellspacing="0" class="finTable" style="width: 100%; font-size: 10pt; font-family: Times New Roman; text-indent: 0px;"&gt;&lt;tbody&gt;&lt;tr style="vertical-align: bottom;"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td colspan="6" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;&lt;b&gt;&lt;b&gt;March 31,&lt;/b&gt;&lt;/b&gt;&lt;/p&gt; &lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom;"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td colspan="2" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;&lt;b&gt;&lt;b&gt;2022&lt;/b&gt;&lt;/b&gt;&lt;/p&gt; &lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td colspan="2" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;&lt;b&gt;&lt;b&gt;2021&lt;/b&gt;&lt;/b&gt;&lt;/p&gt; &lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 70%;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"&gt;Common stock warrants&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;111,891&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;112,963&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"&gt;Stock options&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;116,564&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;62,336&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"&gt;Unvested restricted stock awards&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;&#160;&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;5,182&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;&#160;&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;3,060&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;&#160;&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;233,637&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;&#160;&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;178,359&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;/tbody&gt;&lt;/table&gt;

   &lt;p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"&gt;&#160;&lt;/p&gt;</us-gaap:EarningsPerSharePolicyTextBlock>
    <us-gaap:ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTextBlock contextRef="d_2022-01-01_2022-03-31" id="c2124496">
     &lt;table border="0" cellpadding="0" cellspacing="0" class="finTable" style="width: 100%; font-size: 10pt; font-family: Times New Roman; text-indent: 0px;"&gt;&lt;tbody&gt;&lt;tr style="vertical-align: bottom;"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td colspan="6" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;&lt;b&gt;&lt;b&gt;March 31,&lt;/b&gt;&lt;/b&gt;&lt;/p&gt; &lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom;"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td colspan="2" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;&lt;b&gt;&lt;b&gt;2022&lt;/b&gt;&lt;/b&gt;&lt;/p&gt; &lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td colspan="2" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;&lt;b&gt;&lt;b&gt;2021&lt;/b&gt;&lt;/b&gt;&lt;/p&gt; &lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 70%;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"&gt;Common stock warrants&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;111,891&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;112,963&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"&gt;Stock options&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;116,564&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;62,336&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"&gt;Unvested restricted stock awards&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;&#160;&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;5,182&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;&#160;&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;3,060&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;&#160;&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;233,637&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;&#160;&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;178,359&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
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   &lt;table border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt; font-family: &amp;quot;Times New Roman&amp;quot;, Times, serif; width: 100%;"&gt;&lt;tbody&gt;&lt;tr&gt;&lt;td style="width: 9%;"&gt;&lt;b&gt;&lt;em style="font: inherit;"&gt;4.&lt;/em&gt;&lt;/b&gt;&lt;/td&gt;&lt;td style="width: 91%;"&gt;&lt;b&gt;Cash, cash equivalents and marketable securities&lt;/b&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;/tbody&gt;&lt;/table&gt;
   &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin: 0pt;"&gt;&#160;&lt;/p&gt;
   &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;"&gt;The following is a summary of the Company's cash and cash equivalents as of the date indicated:&lt;/p&gt; &#160;

    &lt;table border="0" cellpadding="0" cellspacing="0" class="finTable" style="width: 100%; font-size: 10pt; font-family: Times New Roman; text-indent: 0px;"&gt;&lt;tbody&gt;&lt;tr style="vertical-align: bottom;"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 66%;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td colspan="2" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0); width: 1%;"&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;March 31, 2022&lt;/p&gt; &lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td colspan="2" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0); width: 1%;"&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;December 31, 2021&lt;/p&gt; &lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom;"&gt;&lt;td style="width: 66%;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 14%;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 14%;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 66%;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"&gt;Cash in banking institutions&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;$&lt;/td&gt;&lt;td style="width: 14%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;1,326,178&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;$&lt;/td&gt;&lt;td style="width: 14%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;30,308,075&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 66%;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"&gt;Money market funds&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 14%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;5,046,607&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 14%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;7,005,483&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 66%;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"&gt;Commercial paper&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;&#160;&lt;/td&gt;&lt;td style="width: 14%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;3,499,545&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;&#160;&lt;/td&gt;&lt;td style="width: 14%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;&#x2014;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 66%;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"&gt;Total&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;$&lt;/td&gt;&lt;td style="width: 14%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;9,872,330&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;$&lt;/td&gt;&lt;td style="width: 14%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;37,313,558&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;/tbody&gt;&lt;/table&gt;
    &lt;p style="margin: 0pt;"&gt;&#160;&lt;/p&gt;

   &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin: 0pt; text-indent: 45pt; text-align: justify;"&gt;The following is a summary of the Company's marketable securities as of &lt;em style="font: inherit;"&gt; March 31, 2022:&lt;/em&gt;&lt;/p&gt;
   &lt;p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"&gt;&#160;&lt;/p&gt;

    &lt;table border="0" cellpadding="0" cellspacing="0" class="finTable" style="width: 100%; font-size: 10pt; font-family: Times New Roman; text-indent: 0px;"&gt;&lt;tbody&gt;&lt;tr style="vertical-align: bottom;"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 32%;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td colspan="2" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0); width: 1%;"&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;Amortized cost&lt;/p&gt; &lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td colspan="2" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0); width: 1%;"&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;Unrealized gains&lt;/p&gt; &lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td colspan="2" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0); width: 1%;"&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;Unrealized losses&lt;/p&gt; &lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td colspan="2" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0); width: 1%;"&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;Fair Value&lt;/p&gt; &lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom;"&gt;&lt;td style="width: 32%;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 14%;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 14%;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 14%;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 14%;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 32%;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"&gt;Commercial paper&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;$&lt;/td&gt;&lt;td style="width: 14%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;19,716,092&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: &amp;quot;Times New Roman&amp;quot;; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: &amp;quot;Times New Roman&amp;quot;; font-size: 10pt;"&gt;$&lt;/td&gt;&lt;td style="width: 14%; font-family: &amp;quot;Times New Roman&amp;quot;; font-size: 10pt; margin-left: 0pt; text-align: right;"&gt;&#x2014;&lt;/td&gt;&lt;td style="width: 1%; font-family: &amp;quot;Times New Roman&amp;quot;; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;$&lt;/td&gt;&lt;td style="width: 14%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;(39,939&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;)&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;$&lt;/td&gt;&lt;td style="width: 14%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;19,676,153&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 32%;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"&gt;U.S. treasury bonds&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;&#160;&lt;/td&gt;&lt;td style="width: 14%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;3,013,869&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: &amp;quot;Times New Roman&amp;quot;; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: &amp;quot;Times New Roman&amp;quot;; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;&#160;&lt;/td&gt;&lt;td style="width: 14%; font-family: &amp;quot;Times New Roman&amp;quot;; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0); text-align: right;"&gt;&#x2014;&lt;/td&gt;&lt;td style="width: 1%; font-family: &amp;quot;Times New Roman&amp;quot;; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;&#160;&lt;/td&gt;&lt;td style="width: 14%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;(9,719&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; padding-bottom: 1px;"&gt;)&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;&#160;&lt;/td&gt;&lt;td style="width: 14%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;3,004,150&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 32%;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"&gt;Total&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;$&lt;/td&gt;&lt;td style="width: 14%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;22,729,961&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: &amp;quot;Times New Roman&amp;quot;; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: &amp;quot;Times New Roman&amp;quot;; font-size: 10pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;$&lt;/td&gt;&lt;td style="width: 14%; font-family: &amp;quot;Times New Roman&amp;quot;; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0); text-align: right;"&gt;&#x2014;&lt;/td&gt;&lt;td style="width: 1%; font-family: &amp;quot;Times New Roman&amp;quot;; font-size: 10pt; padding-bottom: 3px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;$&lt;/td&gt;&lt;td style="width: 14%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;(49,658&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; padding-bottom: 3px;"&gt;)&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;$&lt;/td&gt;&lt;td style="width: 14%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;22,680,303&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;/tbody&gt;&lt;/table&gt;

   &lt;p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"&gt;&#160;&lt;/p&gt;
   &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;"&gt;The Company did &lt;span style="-sec-ix-hidden:c84240720"&gt;not&lt;/span&gt; have marketable securities as of &lt;em style="font: inherit;"&gt; December 31, 2021. &lt;/em&gt;The Company's marketable securities generally have contractual maturity dates between 3 and 12 months. Most of the Company&#x2019;s marketable securities are in an unrealized loss position at &lt;em style="font: inherit;"&gt; March 31, 2022. &lt;/em&gt;Unrealized losses on marketable securities as of &lt;em style="font: inherit;"&gt; March 31, 2022 &lt;/em&gt;were &lt;em style="font: inherit;"&gt;not&lt;/em&gt; significant and were primarily due to changes in interest rates, and &lt;em style="font: inherit;"&gt;not&lt;/em&gt; due to increased credit risks associated with specific securities. Accordingly, no other-than-temporary impairment was recorded for the &lt;em style="font: inherit;"&gt;three&lt;/em&gt; months ended &lt;em style="font: inherit;"&gt; March 31, 2022 &lt;/em&gt;and there were no realized gains or losses recorded during the &lt;em style="font: inherit;"&gt;three&lt;/em&gt; months ended &lt;em style="font: inherit;"&gt; March 31, 2022.&lt;/em&gt;&lt;/p&gt;
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    &lt;table border="0" cellpadding="0" cellspacing="0" class="finTable" style="width: 100%; font-size: 10pt; font-family: Times New Roman; text-indent: 0px;"&gt;&lt;tbody&gt;&lt;tr style="vertical-align: bottom;"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 66%;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td colspan="2" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0); width: 1%;"&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;March 31, 2022&lt;/p&gt; &lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td colspan="2" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0); width: 1%;"&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;December 31, 2021&lt;/p&gt; &lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom;"&gt;&lt;td style="width: 66%;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 14%;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 14%;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 66%;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"&gt;Cash in banking institutions&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;$&lt;/td&gt;&lt;td style="width: 14%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;1,326,178&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;$&lt;/td&gt;&lt;td style="width: 14%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;30,308,075&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 66%;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"&gt;Money market funds&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 14%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;5,046,607&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 14%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;7,005,483&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 66%;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"&gt;Commercial paper&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;&#160;&lt;/td&gt;&lt;td style="width: 14%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;3,499,545&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;&#160;&lt;/td&gt;&lt;td style="width: 14%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;&#x2014;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 66%;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"&gt;Total&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;$&lt;/td&gt;&lt;td style="width: 14%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;9,872,330&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;$&lt;/td&gt;&lt;td style="width: 14%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;37,313,558&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
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&lt;tr style="vertical-align: bottom;"&gt;&lt;td style="width: 32%;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 14%;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 14%;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 14%;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 14%;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 32%;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"&gt;Commercial paper&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;$&lt;/td&gt;&lt;td style="width: 14%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;19,716,092&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: &amp;quot;Times New Roman&amp;quot;; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: &amp;quot;Times New Roman&amp;quot;; font-size: 10pt;"&gt;$&lt;/td&gt;&lt;td style="width: 14%; font-family: &amp;quot;Times New Roman&amp;quot;; font-size: 10pt; margin-left: 0pt; text-align: right;"&gt;&#x2014;&lt;/td&gt;&lt;td style="width: 1%; font-family: &amp;quot;Times New Roman&amp;quot;; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;$&lt;/td&gt;&lt;td style="width: 14%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;(39,939&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;)&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;$&lt;/td&gt;&lt;td style="width: 14%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;19,676,153&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 32%;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"&gt;U.S. treasury bonds&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;&#160;&lt;/td&gt;&lt;td style="width: 14%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;3,013,869&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: &amp;quot;Times New Roman&amp;quot;; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: &amp;quot;Times New Roman&amp;quot;; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;&#160;&lt;/td&gt;&lt;td style="width: 14%; font-family: &amp;quot;Times New Roman&amp;quot;; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0); text-align: right;"&gt;&#x2014;&lt;/td&gt;&lt;td style="width: 1%; font-family: &amp;quot;Times New Roman&amp;quot;; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;&#160;&lt;/td&gt;&lt;td style="width: 14%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;(9,719&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; padding-bottom: 1px;"&gt;)&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;&#160;&lt;/td&gt;&lt;td style="width: 14%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;3,004,150&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 32%;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"&gt;Total&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;$&lt;/td&gt;&lt;td style="width: 14%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;22,729,961&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: &amp;quot;Times New Roman&amp;quot;; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: &amp;quot;Times New Roman&amp;quot;; font-size: 10pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;$&lt;/td&gt;&lt;td style="width: 14%; font-family: &amp;quot;Times New Roman&amp;quot;; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0); text-align: right;"&gt;&#x2014;&lt;/td&gt;&lt;td style="width: 1%; font-family: &amp;quot;Times New Roman&amp;quot;; font-size: 10pt; padding-bottom: 3px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;$&lt;/td&gt;&lt;td style="width: 14%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;(49,658&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; padding-bottom: 3px;"&gt;)&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;$&lt;/td&gt;&lt;td style="width: 14%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;22,680,303&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
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   &lt;table border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt; font-family: &amp;quot;Times New Roman&amp;quot;, Times, serif; width: 100%;"&gt;&lt;tbody&gt;&lt;tr&gt;&lt;td style="width: 9%;"&gt;&lt;b&gt;&lt;em style="font: inherit;"&gt;5.&lt;/em&gt;&lt;/b&gt;&lt;/td&gt;&lt;td style="width: 91%;"&gt;&lt;b&gt;Fair Value of Financial Instruments&lt;/b&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;/tbody&gt;&lt;/table&gt;
   &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;"&gt;&#160;&lt;/p&gt;
   &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;"&gt;Fair value is the price that could be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. Fair value determination in accordance with applicable accounting guidance requires that a number of significant judgments be made. Additionally, fair value is used on a nonrecurring basis to evaluate assets for impairment or as required for disclosure purposes by applicable accounting guidance on disclosures about fair value of financial instruments. Depending on the nature of the assets and liabilities, various valuation techniques and assumptions are used when estimating fair value. The carrying amounts of certain of the Company&#x2019;s financial instruments, including prepaid expense and accounts payable are shown at cost, which approximates fair value due to the short-term nature of these instruments. The Company follows the provisions of FASB ASC Topic &lt;em style="font: inherit;"&gt;820,&lt;/em&gt; &lt;i&gt;Fair Value Measurement&lt;/i&gt;, for financial assets and liabilities measured on a recurring basis. The guidance requires fair value measurements be classified and disclosed in &lt;em style="font: inherit;"&gt;one&lt;/em&gt; of the following &lt;em style="font: inherit;"&gt;three&lt;/em&gt; categories:&lt;/p&gt;
   &lt;p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"&gt;&#160;&lt;/p&gt;
   &lt;table border="0" cellpadding="0" cellspacing="0" style="width:100%;font-family:Times New Roman;font-size:10pt;"&gt;&lt;tbody&gt;&lt;tr&gt;&lt;td style="width:18pt;"&gt;&#160;&lt;/td&gt;&lt;td style="vertical-align:top;width:18pt;"&gt; &lt;p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"&gt;&#x2022;&lt;/p&gt; &lt;/td&gt;&lt;td style="vertical-align:top;"&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;"&gt;Level &lt;em style="font: inherit;"&gt;1:&lt;/em&gt; Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities.&lt;/p&gt; &lt;/td&gt;&lt;/tr&gt;
&lt;/tbody&gt;&lt;/table&gt;
   &lt;table border="0" cellpadding="0" cellspacing="0" style="width:100%;font-family:Times New Roman;font-size:10pt;"&gt;&lt;tbody&gt;&lt;tr&gt;&lt;td style="width:18pt;"&gt;&#160;&lt;/td&gt;&lt;td style="vertical-align:top;width:18pt;"&gt; &lt;p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"&gt;&#x2022;&lt;/p&gt; &lt;/td&gt;&lt;td style="vertical-align:top;"&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;"&gt;Level &lt;em style="font: inherit;"&gt;2:&lt;/em&gt; Quoted prices in markets that are &lt;em style="font: inherit;"&gt;not&lt;/em&gt; active, or inputs which are observable, either directly or indirectly, for substantially the full term of the asset or liabilities.&lt;/p&gt; &lt;/td&gt;&lt;/tr&gt;
&lt;/tbody&gt;&lt;/table&gt;
   &lt;table border="0" cellpadding="0" cellspacing="0" style="width:100%;font-family:Times New Roman;font-size:10pt;"&gt;&lt;tbody&gt;&lt;tr&gt;&lt;td style="width:18pt;"&gt;&#160;&lt;/td&gt;&lt;td style="vertical-align:top;width:18pt;"&gt; &lt;p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"&gt;&#x2022;&lt;/p&gt; &lt;/td&gt;&lt;td style="vertical-align:top;"&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;"&gt;Level &lt;em style="font: inherit;"&gt;3:&lt;/em&gt; Prices or valuation techniques that require inputs that are both significant to the fair value measurement and unobservable (i.e., supported by little or &lt;em style="font: inherit;"&gt;no&lt;/em&gt; market activity).&lt;/p&gt; &lt;/td&gt;&lt;/tr&gt;
&lt;/tbody&gt;&lt;/table&gt;
   &lt;p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"&gt;&#160;&lt;/p&gt;
   &lt;p style="font-family: 'Times New Roman', Times, serif; font-size: 10pt; margin: 0pt; text-align: left"/&gt;
   &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin: 0pt; text-indent: 45pt; text-align: justify;"&gt;The following table presents the Company&#x2019;s assets that are measured at fair value on a recurring basis (amounts in thousands):&lt;/p&gt;
   &lt;p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"&gt;&#160;&lt;/p&gt;

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&lt;tr style="vertical-align: bottom;"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td colspan="2" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;&lt;b&gt;&lt;b&gt;Quoted prices in&lt;/b&gt;&lt;/b&gt;&lt;/p&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;&lt;b&gt;&lt;b&gt;active markets for&lt;/b&gt;&lt;/b&gt;&lt;/p&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;&lt;b&gt;&lt;b&gt;identical assets&lt;/b&gt;&lt;/b&gt;&lt;/p&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;&lt;b&gt;&lt;b&gt;(Level&lt;/b&gt; &lt;b&gt;1)&lt;/b&gt;&lt;/b&gt;&lt;/p&gt; &lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td colspan="2" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;&lt;b&gt;&lt;b&gt;Significant other&lt;/b&gt;&lt;/b&gt;&lt;/p&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;&lt;b&gt;&lt;b&gt;observable inputs&lt;/b&gt;&lt;/b&gt;&lt;/p&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;&lt;b&gt;&lt;b&gt;(Level&lt;/b&gt; &lt;b&gt;2)&lt;/b&gt;&lt;/b&gt;&lt;/p&gt; &lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td colspan="2" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;&lt;b&gt;&lt;b&gt;Significant&lt;/b&gt;&lt;/b&gt;&lt;/p&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;&lt;b&gt;&lt;b&gt;unobservable inputs&lt;/b&gt;&lt;/b&gt;&lt;/p&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;&lt;b&gt;&lt;b&gt;(Level&lt;/b&gt; &lt;b&gt;3)&lt;/b&gt;&lt;/b&gt;&lt;/p&gt; &lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 43%;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"&gt;&lt;b&gt;March 31, 2022:&lt;/b&gt;&lt;/p&gt; &lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&lt;b&gt;&#160;&lt;/b&gt;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&lt;b&gt;&#160;&lt;/b&gt;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&lt;b&gt;&#160;&lt;/b&gt;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&lt;b&gt;&#160;&lt;/b&gt;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&lt;b&gt;&#160;&lt;/b&gt;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&lt;b&gt;&#160;&lt;/b&gt;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&lt;b&gt;&#160;&lt;/b&gt;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&lt;b&gt;&#160;&lt;/b&gt;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&lt;b&gt;&#160;&lt;/b&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"&gt;Cash equivalents:&lt;/p&gt; &lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt; margin-left: 9pt;"&gt;Money market funds&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;$&lt;/td&gt;&lt;td style="width: 16%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;5,046,607&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;$&lt;/td&gt;&lt;td style="width: 16%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#x2014;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;$&lt;/td&gt;&lt;td style="width: 16%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#x2014;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt; margin-left: 9pt;"&gt;Commercial paper&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: &amp;quot;Times New Roman&amp;quot;; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: &amp;quot;Times New Roman&amp;quot;; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;&#160;&lt;/td&gt;&lt;td style="width: 16%; font-family: &amp;quot;Times New Roman&amp;quot;; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0); text-align: right;"&gt;&#x2014;&lt;/td&gt;&lt;td style="width: 1%; font-family: &amp;quot;Times New Roman&amp;quot;; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;&#160;&lt;/td&gt;&lt;td style="width: 16%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;3,499,545&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: &amp;quot;Times New Roman&amp;quot;; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: &amp;quot;Times New Roman&amp;quot;; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;&#160;&lt;/td&gt;&lt;td style="width: 16%; font-family: &amp;quot;Times New Roman&amp;quot;; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0); text-align: right;"&gt;&#x2014;&lt;/td&gt;&lt;td style="width: 1%; font-family: &amp;quot;Times New Roman&amp;quot;; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"&gt;Total cash and cash equivalents&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;$&lt;/td&gt;&lt;td style="width: 16%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;5,046,607&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;$&lt;/td&gt;&lt;td style="width: 16%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;3,499,545&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;$&lt;/td&gt;&lt;td style="width: 16%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;&#x2014;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"&gt;&lt;td&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"&gt;Marketable securities:&lt;/p&gt; &lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt; margin-left: 9pt;"&gt;Commercial paper&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: &amp;quot;Times New Roman&amp;quot;; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: &amp;quot;Times New Roman&amp;quot;; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 16%; font-family: &amp;quot;Times New Roman&amp;quot;; font-size: 10pt; margin-left: 0pt; text-align: right;"&gt;&#x2014;&lt;/td&gt;&lt;td style="width: 1%; font-family: &amp;quot;Times New Roman&amp;quot;; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 16%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;19,676,153&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: &amp;quot;Times New Roman&amp;quot;; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: &amp;quot;Times New Roman&amp;quot;; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 16%; font-family: &amp;quot;Times New Roman&amp;quot;; font-size: 10pt; margin-left: 0pt; text-align: right;"&gt;&#x2014;&lt;/td&gt;&lt;td style="width: 1%; font-family: &amp;quot;Times New Roman&amp;quot;; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt; margin-left: 9pt;"&gt;US treasury&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: &amp;quot;Times New Roman&amp;quot;; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: &amp;quot;Times New Roman&amp;quot;; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;&#160;&lt;/td&gt;&lt;td style="width: 16%; font-family: &amp;quot;Times New Roman&amp;quot;; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0); text-align: right;"&gt;&#x2014;&lt;/td&gt;&lt;td style="width: 1%; font-family: &amp;quot;Times New Roman&amp;quot;; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;&#160;&lt;/td&gt;&lt;td style="width: 16%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;3,004,150&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: &amp;quot;Times New Roman&amp;quot;; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: &amp;quot;Times New Roman&amp;quot;; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;&#160;&lt;/td&gt;&lt;td style="width: 16%; font-family: &amp;quot;Times New Roman&amp;quot;; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0); text-align: right;"&gt;&#x2014;&lt;/td&gt;&lt;td style="width: 1%; font-family: &amp;quot;Times New Roman&amp;quot;; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"&gt;Total marketable securities&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;$&lt;/td&gt;&lt;td style="width: 16%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;&#x2014;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;$&lt;/td&gt;&lt;td style="width: 16%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;22,680,303&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;$&lt;/td&gt;&lt;td style="width: 16%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;&#x2014;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"&gt;&lt;td&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1px;"&gt;&#160;&lt;/td&gt;&lt;td style="border-bottom: 1px solid rgb(0, 0, 0);"&gt;&#160;&lt;/td&gt;&lt;td style="border-bottom: 1px solid rgb(0, 0, 0);"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1px;"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1px;"&gt;&#160;&lt;/td&gt;&lt;td style="border-bottom: 1px solid rgb(0, 0, 0);"&gt;&#160;&lt;/td&gt;&lt;td style="border-bottom: 1px solid rgb(0, 0, 0);"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1px;"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1px;"&gt;&#160;&lt;/td&gt;&lt;td style="border-bottom: 1px solid rgb(0, 0, 0);"&gt;&#160;&lt;/td&gt;&lt;td style="border-bottom: 1px solid rgb(0, 0, 0);"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1px;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"&gt;Total financial assets&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;$&lt;/td&gt;&lt;td style="width: 16%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;5,046,607&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;$&lt;/td&gt;&lt;td style="width: 16%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;26,179,848&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;$&lt;/td&gt;&lt;td style="width: 16%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;&#x2014;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;/tbody&gt;&lt;/table&gt;

   &lt;p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"&gt;&#160;&lt;/p&gt;
   &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;"&gt;The fair value of the Company&#x2019;s Level &lt;em style="font: inherit;"&gt;2&lt;/em&gt; marketable securities are&#160;estimated primarily based on benchmark yields, reported trades, market-based quotes, issuer spreads, &lt;em style="font: inherit;"&gt;two&lt;/em&gt;-sided markets, benchmark securities, bids, offers, and reference data including market research publications, which represent a market approach. In general, a market approach is utilized if there is readily available and relevant market activity for an individual security. This valuation technique &lt;em style="font: inherit;"&gt; may &lt;/em&gt;change from period to period, based on the relevance and availability of market data.&lt;/p&gt;
   &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;"&gt;&#160;&lt;/p&gt;
  </us-gaap:FairValueDisclosuresTextBlock>
    <us-gaap:FairValueAssetsMeasuredOnRecurringBasisTextBlock contextRef="d_2022-01-01_2022-03-31" id="c2124501">
    &lt;table border="0" cellpadding="0" cellspacing="0" class="finTable" style="width: 100%; font-size: 10pt; font-family: Times New Roman; text-indent: 0px;"&gt;&lt;tbody&gt;&lt;tr style="vertical-align: bottom;"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px;"&gt;&#160;&lt;/td&gt;&lt;td colspan="10" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;&lt;b&gt;&lt;b&gt;Fair value measurement at reporting date&lt;/b&gt;&lt;/b&gt;&lt;/p&gt; &lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom;"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td colspan="2" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;&lt;b&gt;&lt;b&gt;Quoted prices in&lt;/b&gt;&lt;/b&gt;&lt;/p&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;&lt;b&gt;&lt;b&gt;active markets for&lt;/b&gt;&lt;/b&gt;&lt;/p&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;&lt;b&gt;&lt;b&gt;identical assets&lt;/b&gt;&lt;/b&gt;&lt;/p&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;&lt;b&gt;&lt;b&gt;(Level&lt;/b&gt; &lt;b&gt;1)&lt;/b&gt;&lt;/b&gt;&lt;/p&gt; &lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td colspan="2" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;&lt;b&gt;&lt;b&gt;Significant other&lt;/b&gt;&lt;/b&gt;&lt;/p&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;&lt;b&gt;&lt;b&gt;observable inputs&lt;/b&gt;&lt;/b&gt;&lt;/p&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;&lt;b&gt;&lt;b&gt;(Level&lt;/b&gt; &lt;b&gt;2)&lt;/b&gt;&lt;/b&gt;&lt;/p&gt; &lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td colspan="2" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;&lt;b&gt;&lt;b&gt;Significant&lt;/b&gt;&lt;/b&gt;&lt;/p&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;&lt;b&gt;&lt;b&gt;unobservable inputs&lt;/b&gt;&lt;/b&gt;&lt;/p&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;&lt;b&gt;&lt;b&gt;(Level&lt;/b&gt; &lt;b&gt;3)&lt;/b&gt;&lt;/b&gt;&lt;/p&gt; &lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 43%;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"&gt;&lt;b&gt;March 31, 2022:&lt;/b&gt;&lt;/p&gt; &lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&lt;b&gt;&#160;&lt;/b&gt;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&lt;b&gt;&#160;&lt;/b&gt;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&lt;b&gt;&#160;&lt;/b&gt;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&lt;b&gt;&#160;&lt;/b&gt;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&lt;b&gt;&#160;&lt;/b&gt;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&lt;b&gt;&#160;&lt;/b&gt;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&lt;b&gt;&#160;&lt;/b&gt;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&lt;b&gt;&#160;&lt;/b&gt;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&lt;b&gt;&#160;&lt;/b&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"&gt;Cash equivalents:&lt;/p&gt; &lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt; margin-left: 9pt;"&gt;Money market funds&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;$&lt;/td&gt;&lt;td style="width: 16%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;5,046,607&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;$&lt;/td&gt;&lt;td style="width: 16%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#x2014;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;$&lt;/td&gt;&lt;td style="width: 16%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#x2014;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt; margin-left: 9pt;"&gt;Commercial paper&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: &amp;quot;Times New Roman&amp;quot;; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: &amp;quot;Times New Roman&amp;quot;; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;&#160;&lt;/td&gt;&lt;td style="width: 16%; font-family: &amp;quot;Times New Roman&amp;quot;; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0); text-align: right;"&gt;&#x2014;&lt;/td&gt;&lt;td style="width: 1%; font-family: &amp;quot;Times New Roman&amp;quot;; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;&#160;&lt;/td&gt;&lt;td style="width: 16%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;3,499,545&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: &amp;quot;Times New Roman&amp;quot;; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: &amp;quot;Times New Roman&amp;quot;; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;&#160;&lt;/td&gt;&lt;td style="width: 16%; font-family: &amp;quot;Times New Roman&amp;quot;; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0); text-align: right;"&gt;&#x2014;&lt;/td&gt;&lt;td style="width: 1%; font-family: &amp;quot;Times New Roman&amp;quot;; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"&gt;Total cash and cash equivalents&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;$&lt;/td&gt;&lt;td style="width: 16%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;5,046,607&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;$&lt;/td&gt;&lt;td style="width: 16%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;3,499,545&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;$&lt;/td&gt;&lt;td style="width: 16%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;&#x2014;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"&gt;&lt;td&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;&lt;td&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"&gt;Marketable securities:&lt;/p&gt; &lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt; margin-left: 9pt;"&gt;Commercial paper&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: &amp;quot;Times New Roman&amp;quot;; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: &amp;quot;Times New Roman&amp;quot;; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 16%; font-family: &amp;quot;Times New Roman&amp;quot;; font-size: 10pt; margin-left: 0pt; text-align: right;"&gt;&#x2014;&lt;/td&gt;&lt;td style="width: 1%; font-family: &amp;quot;Times New Roman&amp;quot;; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 16%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;19,676,153&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: &amp;quot;Times New Roman&amp;quot;; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: &amp;quot;Times New Roman&amp;quot;; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 16%; font-family: &amp;quot;Times New Roman&amp;quot;; font-size: 10pt; margin-left: 0pt; text-align: right;"&gt;&#x2014;&lt;/td&gt;&lt;td style="width: 1%; font-family: &amp;quot;Times New Roman&amp;quot;; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt; margin-left: 9pt;"&gt;US treasury&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: &amp;quot;Times New Roman&amp;quot;; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: &amp;quot;Times New Roman&amp;quot;; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;&#160;&lt;/td&gt;&lt;td style="width: 16%; font-family: &amp;quot;Times New Roman&amp;quot;; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0); text-align: right;"&gt;&#x2014;&lt;/td&gt;&lt;td style="width: 1%; font-family: &amp;quot;Times New Roman&amp;quot;; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;&#160;&lt;/td&gt;&lt;td style="width: 16%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;3,004,150&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: &amp;quot;Times New Roman&amp;quot;; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: &amp;quot;Times New Roman&amp;quot;; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;&#160;&lt;/td&gt;&lt;td style="width: 16%; font-family: &amp;quot;Times New Roman&amp;quot;; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0); text-align: right;"&gt;&#x2014;&lt;/td&gt;&lt;td style="width: 1%; font-family: &amp;quot;Times New Roman&amp;quot;; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"&gt;Total marketable securities&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;$&lt;/td&gt;&lt;td style="width: 16%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;&#x2014;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;$&lt;/td&gt;&lt;td style="width: 16%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;22,680,303&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;$&lt;/td&gt;&lt;td style="width: 16%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;&#x2014;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"&gt;&lt;td&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1px;"&gt;&#160;&lt;/td&gt;&lt;td style="border-bottom: 1px solid rgb(0, 0, 0);"&gt;&#160;&lt;/td&gt;&lt;td style="border-bottom: 1px solid rgb(0, 0, 0);"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1px;"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1px;"&gt;&#160;&lt;/td&gt;&lt;td style="border-bottom: 1px solid rgb(0, 0, 0);"&gt;&#160;&lt;/td&gt;&lt;td style="border-bottom: 1px solid rgb(0, 0, 0);"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1px;"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1px;"&gt;&#160;&lt;/td&gt;&lt;td style="border-bottom: 1px solid rgb(0, 0, 0);"&gt;&#160;&lt;/td&gt;&lt;td style="border-bottom: 1px solid rgb(0, 0, 0);"&gt;&#160;&lt;/td&gt;&lt;td style="padding-bottom: 1px;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"&gt;Total financial assets&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;$&lt;/td&gt;&lt;td style="width: 16%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;5,046,607&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;$&lt;/td&gt;&lt;td style="width: 16%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;26,179,848&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;$&lt;/td&gt;&lt;td style="width: 16%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;&#x2014;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;/tbody&gt;&lt;/table&gt;
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   &lt;table border="0" cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;width:100%;margin-left:auto;margin-right:auto;"&gt;&lt;tbody&gt;&lt;tr&gt;&lt;td style="vertical-align: top; width: 9%;"&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;"&gt;&lt;b&gt;&lt;em style="font: inherit;"&gt;6.&lt;/em&gt;&lt;/b&gt;&lt;/p&gt; &lt;/td&gt;&lt;td style="vertical-align: top; width: 91%;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin: 0pt;"&gt;&lt;b&gt;Accrued Expenses and Other Current Liabilities&lt;/b&gt;&lt;/p&gt; &lt;/td&gt;&lt;/tr&gt;
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    &lt;table border="0" cellpadding="0" cellspacing="0" class="finTable" style="width: 100%; font-size: 10pt; font-family: Times New Roman; text-indent: 0px;"&gt;&lt;tbody&gt;&lt;tr style="vertical-align: bottom;"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td colspan="2" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;&lt;b&gt;&lt;b&gt;March 31,&lt;/b&gt;&lt;/b&gt;&lt;/p&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;&lt;b&gt;&lt;b&gt;2022&lt;/b&gt;&lt;/b&gt;&lt;/p&gt; &lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td colspan="2" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;&lt;b&gt;&lt;b&gt;December 31,&lt;/b&gt;&lt;/b&gt;&lt;/p&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;&lt;b&gt;&lt;b&gt;2021&lt;/b&gt;&lt;/b&gt;&lt;/p&gt; &lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 70%;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"&gt;Accrued payroll and payroll related expenses&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;$&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;399,847&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;$&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;879,971&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"&gt;Accrued professional fees&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;142,668&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;247,704&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"&gt;Accrued clinical studies expenses&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;1,472,119&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;786,579&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"&gt;Other&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;&#160;&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;127,999&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;&#160;&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;65,935&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"&gt;Total&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;$&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;2,142,633&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;$&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;1,980,189&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
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&lt;tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 70%;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"&gt;Accrued payroll and payroll related expenses&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;$&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;399,847&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;$&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;879,971&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"&gt;Accrued professional fees&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;142,668&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;247,704&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"&gt;Accrued clinical studies expenses&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;1,472,119&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;786,579&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"&gt;Other&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;&#160;&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;127,999&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;&#160;&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;65,935&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"&gt;Total&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;$&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;2,142,633&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;$&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;1,980,189&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
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   &lt;table border="0" cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;width:100%;margin-left:auto;margin-right:auto;"&gt;&lt;tbody&gt;&lt;tr&gt;&lt;td style="vertical-align:top;width:9%;"&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;"&gt;&lt;b&gt;&lt;em style="font: inherit;"&gt;7.&lt;/em&gt;&lt;/b&gt;&lt;/p&gt; &lt;/td&gt;&lt;td style="vertical-align: top; width: 91%;"&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;"&gt;&lt;b&gt;Stockholders' Equity and Common Stock Warrants&lt;/b&gt;&lt;/p&gt; &lt;/td&gt;&lt;/tr&gt;
&lt;/tbody&gt;&lt;/table&gt;
   &lt;p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"&gt;&#160;&lt;/p&gt;
   &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt;"&gt;&lt;i&gt;Private Placement of Series C Preferred Stock&lt;/i&gt;&lt;/p&gt;
   &lt;p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"&gt;&#160;&lt;/p&gt;
   &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;"&gt;On &lt;em style="font: inherit;"&gt; March 18, 2022, &lt;/em&gt;the Company issued and sold to Robert J. Cobuzzi, Jr., Ph.D., its President &amp;amp; Chief Executive Officer, and William R. Elder, its General Counsel &amp;amp; Corporate Secretary, an aggregate of 10,000 shares of Series C Preferred Stock at an offering price of $0.50 per share, representing &lt;em style="font: inherit;"&gt;100%&lt;/em&gt; of the stated value per share of the Series C Preferred Stock, for aggregate gross proceeds of &lt;span style="-sec-ix-hidden:c84240794"&gt;$5,000.&lt;/span&gt;&lt;/p&gt;
   &lt;p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"&gt;&#160;&lt;/p&gt;
   &lt;p style="font-family: 'Times New Roman', Times, serif; font-size: 10pt; margin: 0pt; text-align: left"/&gt;
   &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;"&gt;The Series C Certificate provides that, among other things, (i) each share of Series C Preferred Stock is convertible into 0.02 shares of the Company's common stock, representing a conversion price of $25.00 per share, subject to certain conditions, (ii) each share of Series C Preferred Stock outstanding is counted on an as converted basis, together with the Company&#x2019;s common stock as a single class, for purposes of determining the presence of a quorum at any meeting at which holders are asked to vote on matters related to the Reverse Stock Split (subject to any applicable exchange listing rules), (iii) each share of Series C Preferred Stock outstanding has the right to cast &lt;em style="font: inherit;"&gt;1,600&lt;/em&gt; votes per share of Series C Preferred Stock on the Reverse Stock Split on a &#x201c;mirrored&#x201d; basis &#x2014; this means that the holders of the Series C Preferred Stock are required to vote their shares in a manner that &#x201c;mirrors&#x201d; the proportions of &#x201c;For&#x201d; and &#x201c;Against&#x201d; votes cast by the holders of the Company&#x2019;s common stock are voted on the Amendment (excluding, for the avoidance of doubt, any shares of common stock that are &lt;em style="font: inherit;"&gt;not&lt;/em&gt; voted), and (iv) the holders of outstanding shares of Series C Preferred Stock are entitled to dividends, on an as converted basis, equal to dividends actually paid, if any, on shares of common stock and participate in any liquidation of the Company on an as converted basis.&lt;/p&gt;
   &lt;p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"&gt;&#160;&lt;/p&gt;
   &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;"&gt;On &lt;em style="font: inherit;"&gt; April 18, 2022, &lt;/em&gt;following approval of the Reverse Stock Split by the Company's stockholders, all 10,000 shares of Series C Preferred Stock were converted into an aggregate of 200 shares of the Company's common stock in accordance with the terms of the Series C Certificate.&lt;/p&gt;
   &lt;p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"&gt;&#160;&lt;/p&gt;
   &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt;"&gt;&lt;i&gt;Common Stock Warrants&lt;/i&gt;&lt;/p&gt;
   &lt;p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"&gt;&#160;&lt;/p&gt;
   &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;"&gt;During its evaluation of equity classification for the Company's common stock warrants issued in previous periods, the Company considered the conditions as prescribed within ASC &lt;em style="font: inherit;"&gt;815&lt;/em&gt;-&lt;em style="font: inherit;"&gt;40,&lt;/em&gt;&lt;i&gt; Derivatives and Hedging&lt;/i&gt;, &lt;i&gt;Contracts in an Entity&lt;/i&gt;&#x2019;&lt;i&gt;s own Equity&lt;/i&gt;. The conditions within ASC &lt;em style="font: inherit;"&gt;815&lt;/em&gt;-&lt;em style="font: inherit;"&gt;40&lt;/em&gt; are &lt;em style="font: inherit;"&gt;not&lt;/em&gt; subject to a probability assessment. The warrants do &lt;em style="font: inherit;"&gt;not&lt;/em&gt; fall under the liability criteria within ASC &lt;em style="font: inherit;"&gt;480&lt;/em&gt; &lt;i&gt;Distinguishing Liabilities from Equity&lt;/i&gt; as they are &lt;em style="font: inherit;"&gt;not&lt;/em&gt; puttable and do &lt;em style="font: inherit;"&gt;not&lt;/em&gt; represent an instrument that has a redeemable underlying security. The warrants do meet the definition of a derivative instrument under ASC &lt;em style="font: inherit;"&gt;815,&lt;/em&gt; but are eligible for the scope exception as they are indexed to the Company&#x2019;s own stock and would be classified in permanent equity if freestanding.&lt;/p&gt;
   &lt;p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"&gt;&#160;&lt;/p&gt;
   &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;"&gt;As of &lt;em style="font: inherit;"&gt; March&#160;&lt;/em&gt;&lt;em style="font: inherit;"&gt;31,&lt;/em&gt; &lt;em style="font: inherit;"&gt;2022,&lt;/em&gt; the Company had the following warrants outstanding to acquire shares of its common stock:&lt;/p&gt;
   &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt;text-indent:36pt;"&gt;&#160;&lt;/p&gt;

    &lt;table border="0" cellpadding="0" cellspacing="0" class="finTable" style="width: 100%; font-size: 10pt; font-family: Times New Roman; text-indent: 0px;"&gt;&lt;tbody&gt;&lt;tr style="vertical-align: bottom;"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 52%;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td colspan="2" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0); width: 1%;"&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;&lt;b&gt;&lt;b&gt;Outstanding&lt;/b&gt;&lt;/b&gt;&lt;/p&gt; &lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td colspan="3" rowspan="1" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0); width: 9%;"&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;&lt;b&gt;&lt;b&gt;Range of exercise&lt;/b&gt;&lt;/b&gt;&lt;/p&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;&lt;b&gt;&lt;b&gt;price per share&lt;/b&gt;&lt;/b&gt;&lt;/p&gt; &lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; width: 18%; border-bottom: 1px solid rgb(0, 0, 0);"&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;&lt;b&gt;Expiration dates&lt;/b&gt;&lt;/p&gt; &lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 52%;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"&gt;Common stock warrants issued related to the January 2018 common stock offering&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 10%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;23,639&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td colspan="1" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; width: 5%;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin: 0pt; text-align: right;"&gt;$599.71&lt;/p&gt; &lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 4%; text-align: center;"&gt;&lt;em style="font: inherit;"&gt;-&lt;/em&gt;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 5%;"&gt;$749.76&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; width: 18%;"&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;&lt;em style="font: inherit;"&gt;January 2023&lt;/em&gt;&lt;/p&gt; &lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 52%;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"&gt;Common stock warrants issued related to the May 2019 common stock offering&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 10%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;27,648&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td colspan="1" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; width: 5%;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin: 0pt; text-align: right;"&gt;$250.09&lt;/p&gt; &lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 4%; text-align: center;"&gt;&lt;em style="font: inherit;"&gt;-&lt;/em&gt;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 5%;"&gt;$306.04&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; width: 18%;"&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;&lt;em style="font: inherit;"&gt;May and December 2024&lt;/em&gt;&lt;/p&gt; &lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 52%;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"&gt;Common stock warrants issued related to the November 2019 common stock offering&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 10%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;4,269&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 5%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&lt;em style="font: inherit;"&gt;&#160;&lt;/em&gt;&lt;/td&gt;&lt;td style="width: 4%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; text-align: center;"&gt;$17.51&lt;/td&gt;&lt;td style="width: 5%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&lt;em style="font: inherit;"&gt;&#160;&lt;/em&gt;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; width: 18%;"&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;&lt;em style="font: inherit;"&gt;May 2024&lt;/em&gt;&lt;/p&gt; &lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 52%;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"&gt;Common stock warrants issued related to the December 2019 common stock offering&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 10%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;6,264&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td colspan="1" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; width: 5%;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin: 0pt; text-align: right;"&gt;$21.68&lt;/p&gt; &lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 4%; text-align: center;"&gt;&lt;em style="font: inherit;"&gt;-&lt;/em&gt;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 5%;"&gt;$34.92&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; width: 18%;"&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;&lt;em style="font: inherit;"&gt;December 2024 and June 2025&lt;/em&gt;&lt;/p&gt; &lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 52%;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"&gt;Common stock warrants issued related to the May 2020 common stock offering&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 10%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;11,424&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 5%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&lt;em style="font: inherit;"&gt;&#160;&lt;/em&gt;&lt;/td&gt;&lt;td style="width: 4%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; text-align: center;"&gt;$65.65&lt;/td&gt;&lt;td style="width: 5%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&lt;em style="font: inherit;"&gt;&#160;&lt;/em&gt;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; width: 18%;"&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;&lt;em style="font: inherit;"&gt;March 2025&lt;/em&gt;&lt;/p&gt; &lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 52%;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"&gt;Common stock warrants issued related to the May 2020 investor warrant exercise&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 10%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;4,998&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 5%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&lt;em style="font: inherit;"&gt;&#160;&lt;/em&gt;&lt;/td&gt;&lt;td style="width: 4%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; text-align: center;"&gt;$29.7&lt;/td&gt;&lt;td style="width: 5%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&lt;em style="font: inherit;"&gt;&#160;&lt;/em&gt;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; width: 18%;"&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;&lt;em style="font: inherit;"&gt;November 2025&lt;/em&gt;&lt;/p&gt; &lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 52%;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"&gt;Common stock warrants issued related to the February 2021 common stock offering&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;&#160;&lt;/td&gt;&lt;td style="width: 10%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;33,649&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 5%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&lt;em style="font: inherit;"&gt;&#160;&lt;/em&gt;&lt;/td&gt;&lt;td style="width: 4%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt; text-align: center;"&gt;$64.08&lt;/td&gt;&lt;td style="width: 5%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;"&gt;&lt;em style="font: inherit;"&gt;&#160;&lt;/em&gt;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; width: 18%;"&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;&lt;em style="font: inherit;"&gt;February 2026&lt;/em&gt;&lt;/p&gt; &lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 52%;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;&#160;&lt;/td&gt;&lt;td style="width: 10%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;111,891&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="text-align: right; font-family: Times New Roman; font-size: 10pt; width: 5%;"&gt;&lt;em style="font: inherit;"&gt;&#160;&lt;/em&gt;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; width: 4%;"&gt;&lt;em style="font: inherit;"&gt;&#160;&lt;/em&gt;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; width: 5%;"&gt;&lt;em style="font: inherit;"&gt;&#160;&lt;/em&gt;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 18%;"&gt;&lt;em style="font: inherit;"&gt;&#160;&lt;/em&gt;&lt;/td&gt;&lt;/tr&gt;
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   &lt;p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"&gt;&#160;&lt;/p&gt;
   &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin: 0pt; text-indent: 45pt; text-align: justify;"&gt;During the &lt;em style="font: inherit;"&gt;three&lt;/em&gt; months ended &lt;em style="font: inherit;"&gt; March&#160;&lt;/em&gt;&lt;em style="font: inherit;"&gt;31,&lt;/em&gt; &lt;em style="font: inherit;"&gt;2022,&lt;/em&gt; 18,077 warrants expired.&lt;/p&gt;
   &lt;p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"&gt;&#160;&lt;/p&gt;
   &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt 0pt 0pt 8pt;"&gt;&lt;b/&gt;&lt;/p&gt;
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    &lt;table border="0" cellpadding="0" cellspacing="0" class="finTable" style="width: 100%; font-size: 10pt; font-family: Times New Roman; text-indent: 0px;"&gt;&lt;tbody&gt;&lt;tr style="vertical-align: bottom;"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 52%;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td colspan="2" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0); width: 1%;"&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;&lt;b&gt;&lt;b&gt;Outstanding&lt;/b&gt;&lt;/b&gt;&lt;/p&gt; &lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td colspan="3" rowspan="1" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0); width: 9%;"&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;&lt;b&gt;&lt;b&gt;Range of exercise&lt;/b&gt;&lt;/b&gt;&lt;/p&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;&lt;b&gt;&lt;b&gt;price per share&lt;/b&gt;&lt;/b&gt;&lt;/p&gt; &lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; width: 18%; border-bottom: 1px solid rgb(0, 0, 0);"&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;&lt;b&gt;Expiration dates&lt;/b&gt;&lt;/p&gt; &lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 52%;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"&gt;Common stock warrants issued related to the January 2018 common stock offering&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 10%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;23,639&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td colspan="1" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; width: 5%;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin: 0pt; text-align: right;"&gt;$599.71&lt;/p&gt; &lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 4%; text-align: center;"&gt;&lt;em style="font: inherit;"&gt;-&lt;/em&gt;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 5%;"&gt;$749.76&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; width: 18%;"&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;&lt;em style="font: inherit;"&gt;January 2023&lt;/em&gt;&lt;/p&gt; &lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 52%;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"&gt;Common stock warrants issued related to the May 2019 common stock offering&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 10%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;27,648&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td colspan="1" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; width: 5%;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin: 0pt; text-align: right;"&gt;$250.09&lt;/p&gt; &lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 4%; text-align: center;"&gt;&lt;em style="font: inherit;"&gt;-&lt;/em&gt;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 5%;"&gt;$306.04&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; width: 18%;"&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;&lt;em style="font: inherit;"&gt;May and December 2024&lt;/em&gt;&lt;/p&gt; &lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 52%;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"&gt;Common stock warrants issued related to the November 2019 common stock offering&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 10%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;4,269&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 5%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&lt;em style="font: inherit;"&gt;&#160;&lt;/em&gt;&lt;/td&gt;&lt;td style="width: 4%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; text-align: center;"&gt;$17.51&lt;/td&gt;&lt;td style="width: 5%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&lt;em style="font: inherit;"&gt;&#160;&lt;/em&gt;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; width: 18%;"&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;&lt;em style="font: inherit;"&gt;May 2024&lt;/em&gt;&lt;/p&gt; &lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 52%;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"&gt;Common stock warrants issued related to the December 2019 common stock offering&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 10%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;6,264&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td colspan="1" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; width: 5%;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin: 0pt; text-align: right;"&gt;$21.68&lt;/p&gt; &lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 4%; text-align: center;"&gt;&lt;em style="font: inherit;"&gt;-&lt;/em&gt;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 5%;"&gt;$34.92&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; width: 18%;"&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;&lt;em style="font: inherit;"&gt;December 2024 and June 2025&lt;/em&gt;&lt;/p&gt; &lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 52%;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"&gt;Common stock warrants issued related to the May 2020 common stock offering&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 10%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;11,424&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 5%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&lt;em style="font: inherit;"&gt;&#160;&lt;/em&gt;&lt;/td&gt;&lt;td style="width: 4%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; text-align: center;"&gt;$65.65&lt;/td&gt;&lt;td style="width: 5%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&lt;em style="font: inherit;"&gt;&#160;&lt;/em&gt;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; width: 18%;"&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;&lt;em style="font: inherit;"&gt;March 2025&lt;/em&gt;&lt;/p&gt; &lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 52%;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"&gt;Common stock warrants issued related to the May 2020 investor warrant exercise&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 10%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;4,998&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 5%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&lt;em style="font: inherit;"&gt;&#160;&lt;/em&gt;&lt;/td&gt;&lt;td style="width: 4%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; text-align: center;"&gt;$29.7&lt;/td&gt;&lt;td style="width: 5%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&lt;em style="font: inherit;"&gt;&#160;&lt;/em&gt;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; width: 18%;"&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;&lt;em style="font: inherit;"&gt;November 2025&lt;/em&gt;&lt;/p&gt; &lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 52%;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"&gt;Common stock warrants issued related to the February 2021 common stock offering&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;&#160;&lt;/td&gt;&lt;td style="width: 10%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;33,649&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 5%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&lt;em style="font: inherit;"&gt;&#160;&lt;/em&gt;&lt;/td&gt;&lt;td style="width: 4%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt; text-align: center;"&gt;$64.08&lt;/td&gt;&lt;td style="width: 5%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;"&gt;&lt;em style="font: inherit;"&gt;&#160;&lt;/em&gt;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; width: 18%;"&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;&lt;em style="font: inherit;"&gt;February 2026&lt;/em&gt;&lt;/p&gt; &lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 52%;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;&#160;&lt;/td&gt;&lt;td style="width: 10%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;111,891&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="text-align: right; font-family: Times New Roman; font-size: 10pt; width: 5%;"&gt;&lt;em style="font: inherit;"&gt;&#160;&lt;/em&gt;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; width: 4%;"&gt;&lt;em style="font: inherit;"&gt;&#160;&lt;/em&gt;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; width: 5%;"&gt;&lt;em style="font: inherit;"&gt;&#160;&lt;/em&gt;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 18%;"&gt;&lt;em style="font: inherit;"&gt;&#160;&lt;/em&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;/tbody&gt;&lt;/table&gt;
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   &lt;table border="0" cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;width:100%;margin-left:auto;margin-right:auto;"&gt;&lt;tbody&gt;&lt;tr&gt;&lt;td style="vertical-align:top;width:9%;"&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;"&gt;&lt;b&gt;&lt;em style="font: inherit;"&gt;8.&lt;/em&gt;&lt;/b&gt;&lt;/p&gt; &lt;/td&gt;&lt;td style="vertical-align: top; width: 91%;"&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;"&gt;&lt;b&gt;Stock-Based Compensation&lt;/b&gt;&lt;/p&gt; &lt;/td&gt;&lt;/tr&gt;
&lt;/tbody&gt;&lt;/table&gt;
   &lt;p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"&gt;&#160;&lt;/p&gt;
   &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin: 0pt; text-indent: 9pt;"&gt;&lt;i&gt;&lt;em style="font: inherit;"&gt;2015&lt;/em&gt; Equity Plan&lt;/i&gt;&lt;/p&gt;
   &lt;p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"&gt;&#160;&lt;/p&gt;
   &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;"&gt;The &lt;em style="font: inherit;"&gt;2015&lt;/em&gt; Equity Plan provides for increases to the number of shares reserved for issuance thereunder each &lt;em style="font: inherit;"&gt; January 1 &lt;/em&gt;equal to 4.0% of the total shares of the Company&#x2019;s common stock outstanding as of the immediately preceding &lt;em style="font: inherit;"&gt; December 31, &lt;/em&gt;unless a lesser amount is stipulated by the Compensation Committee of the Company's board of directors. Accordingly, 81,531 shares were added to the reserve as of &lt;em style="font: inherit;"&gt; January 1, 2022, &lt;/em&gt;which shares &lt;em style="font: inherit;"&gt; may &lt;/em&gt;be issued in connection with the grant of stock-based awards, including stock options, restricted stock, restricted stock units, stock appreciation rights and other types of awards as deemed appropriate, in each case, in accordance with the terms of the &lt;em style="font: inherit;"&gt;2015&lt;/em&gt; Equity Plan. As of &lt;em style="font: inherit;"&gt; March 31, 2022, &lt;/em&gt;there were 49,039 shares available for future issuance under the &lt;em style="font: inherit;"&gt;2015&lt;/em&gt; Equity Plan.&lt;/p&gt;
   &lt;p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"&gt;&#160;&lt;/p&gt;
   &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt;text-indent:45pt;"&gt;The Company recorded stock-based compensation expense in the following expense categories of its unaudited interim consolidated statements of operations for the periods indicated:&lt;/p&gt;
   &lt;p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"&gt;&#160;&lt;/p&gt;

    &lt;table border="0" cellpadding="0" cellspacing="0" class="finTable" style="width: 100%; font-size: 10pt; font-family: Times New Roman; text-indent: 0px;"&gt;&lt;tbody&gt;&lt;tr style="vertical-align: bottom;"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td colspan="6" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;&lt;b&gt;&lt;b&gt;Three Months Ended&lt;/b&gt;&lt;/b&gt;&lt;/p&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;&lt;b&gt;&lt;b&gt;March 31,&lt;/b&gt;&lt;/b&gt;&lt;/p&gt; &lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom;"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td colspan="2" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;&lt;b&gt;&lt;b&gt;2022&lt;/b&gt;&lt;/b&gt;&lt;/p&gt; &lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td colspan="2" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;&lt;b&gt;&lt;b&gt;2021&lt;/b&gt;&lt;/b&gt;&lt;/p&gt; &lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 70%;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"&gt;Research and development&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;$&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;58,892&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;$&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;33,000&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"&gt;General and administrative&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;&#160;&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;219,239&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;&#160;&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;148,280&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"&gt;Total stock-based compensation expense&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;$&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;278,131&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;$&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;181,280&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;/tbody&gt;&lt;/table&gt;

   &lt;p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"&gt;&#160;&lt;/p&gt;
   &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;"&gt;The following table summarizes the activity related to all stock option grants for the &lt;em style="font: inherit;"&gt;three&lt;/em&gt; months ended &lt;em style="font: inherit;"&gt; March&#160;&lt;/em&gt;&lt;em style="font: inherit;"&gt;31,&lt;/em&gt; &lt;em style="font: inherit;"&gt;2022:&lt;/em&gt;&lt;/p&gt;
   &lt;p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"&gt;&#160;&lt;/p&gt;

    &lt;table border="0" cellpadding="0" cellspacing="0" class="finTable" style="width: 100%; font-size: 10pt; font-family: Times New Roman; text-indent: 0px;"&gt;&lt;tbody&gt;&lt;tr style="vertical-align: bottom;"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 40%;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td colspan="2" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0); width: 1%;"&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;&lt;b&gt;&lt;b&gt;Number of&lt;/b&gt;&lt;/b&gt;&lt;/p&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;&lt;b&gt;&lt;b&gt;Options&lt;/b&gt;&lt;/b&gt;&lt;/p&gt; &lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td colspan="2" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0); width: 1%;"&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;&lt;b&gt;&lt;b&gt;Weighted&lt;/b&gt;&lt;/b&gt;&lt;/p&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;&lt;b&gt;&lt;b&gt;average&lt;/b&gt;&lt;/b&gt;&lt;/p&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;&lt;b&gt;&lt;b&gt;exercise&lt;/b&gt;&lt;/b&gt;&lt;/p&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;&lt;b&gt;&lt;b&gt;price&lt;/b&gt;&lt;/b&gt;&lt;/p&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;&lt;b&gt;&lt;b&gt;per share&lt;/b&gt;&lt;/b&gt;&lt;/p&gt; &lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td colspan="2" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0); width: 1%;"&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;&lt;b&gt;&lt;b&gt;Weighted&lt;/b&gt;&lt;/b&gt;&lt;/p&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;&lt;b&gt;&lt;b&gt;average&lt;/b&gt;&lt;/b&gt;&lt;/p&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;&lt;b&gt;&lt;b&gt;remaining&lt;/b&gt;&lt;/b&gt;&lt;/p&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;&lt;b&gt;&lt;b&gt;contractual&lt;/b&gt;&lt;/b&gt;&lt;/p&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;&lt;b&gt;&lt;b&gt;life&lt;/b&gt;&lt;/b&gt;&lt;/p&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;&lt;b&gt;&lt;b&gt;(in years)&lt;/b&gt;&lt;/b&gt;&lt;/p&gt; &lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td colspan="2" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0); width: 1%;"&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;&lt;b&gt;&lt;b&gt;Aggregate&lt;/b&gt;&lt;/b&gt;&lt;/p&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;&lt;b&gt;&lt;b&gt;intrinsic&lt;/b&gt;&lt;/b&gt;&lt;/p&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;&lt;b&gt;&lt;b&gt;value&lt;/b&gt;&lt;/b&gt;&lt;/p&gt; &lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 40%;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"&gt;Balance at January 1, 2022&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;72,454&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;$&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;265.85&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="text-align: right; font-family: Times New Roman; font-size: 10pt; width: 12%;"&gt;&lt;em style="font: inherit;"&gt;&#160;&lt;/em&gt;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="text-align: right; font-family: Times New Roman; font-size: 10pt; width: 12%;"&gt;&lt;em style="font: inherit;"&gt;&#160;&lt;/em&gt;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 40%;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"&gt;Granted&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;48,300&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;12.00&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="text-align: right; font-family: Times New Roman; font-size: 10pt; width: 12%;"&gt;&lt;em style="font: inherit;"&gt;&#160;&lt;/em&gt;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="text-align: right; font-family: Times New Roman; font-size: 10pt; width: 12%;"&gt;&lt;em style="font: inherit;"&gt;&#160;&lt;/em&gt;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 40%;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"&gt;Cancelled/forfeited&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;&#160;&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;(4,190&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; padding-bottom: 1px;"&gt;)&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;75.33&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="text-align: right; font-family: Times New Roman; font-size: 10pt; width: 12%;"&gt;&lt;em style="font: inherit;"&gt;&#160;&lt;/em&gt;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="text-align: right; font-family: Times New Roman; font-size: 10pt; width: 12%;"&gt;&lt;em style="font: inherit;"&gt;&#160;&lt;/em&gt;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 40%;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"&gt;Outstanding at March 31, 2022&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;&#160;&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;116,564&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;$&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;164.31&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;8.89&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;$&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;23,163&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 40%;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"&gt;Exercisable at March 31, 2022&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;&#160;&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;52,849&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;$&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;346.79&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;8.13&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;$&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;1,956&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 40%;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"&gt;Vested and expected to vest at March 31, 2022&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;&#160;&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;116,564&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;$&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;164.31&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;8.89&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;$&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;23,163&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;/tbody&gt;&lt;/table&gt;

   &lt;p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"&gt;&#160;&lt;/p&gt;
   &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;"&gt;The weighted average grant date fair value of stock option awards granted was $10.90 during the &lt;em style="font: inherit;"&gt;three&lt;/em&gt; months ended &lt;em style="font: inherit;"&gt; March 31, 2022. &lt;/em&gt;The total fair value of options vested during the &lt;em style="font: inherit;"&gt;three&lt;/em&gt; months ended &lt;em style="font: inherit;"&gt; March 31, 2022 &lt;/em&gt;and &lt;em style="font: inherit;"&gt;2021&lt;/em&gt; was $0.3 million and $0.2 million, respectively. No options were exercised during any of the periods presented. At &lt;em style="font: inherit;"&gt; March&#160;&lt;/em&gt;&lt;em style="font: inherit;"&gt;31,&lt;/em&gt; &lt;em style="font: inherit;"&gt;2022,&lt;/em&gt; there was $1.3 million of unrecognized compensation expense that will be recognized over a weighted-average period of 1.97 years.&lt;/p&gt;
   &lt;p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"&gt;&#160;&lt;/p&gt;
   &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;"&gt;Options granted were valued using the Black-Scholes-Merton derivative instrument pricing model and assumptions used to value the options granted during the &lt;em style="font: inherit;"&gt;three&lt;/em&gt; months ended &lt;em style="font: inherit;"&gt; March 31, 2022 &lt;/em&gt;were as follows:&lt;/p&gt;
   &lt;p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"&gt;&#160;&lt;/p&gt;

    &lt;table border="0" cellpadding="0" cellspacing="0" class="finTable" style="width: 100%; font-size: 10pt; font-family: Times New Roman; text-indent: 0px;"&gt;&lt;tbody&gt;&lt;tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 85%;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"&gt;Expected term (in years)&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;5.7&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"&gt;Risk-free interest rate&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;1.7&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;%&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"&gt;Expected volatility&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;134.7&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;%&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"&gt;Dividend yield&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: &amp;quot;Times New Roman&amp;quot;; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: &amp;quot;Times New Roman&amp;quot;; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 12%; font-family: &amp;quot;Times New Roman&amp;quot;; font-size: 10pt; margin-left: 0pt; text-align: right;"&gt;&lt;em style="font: inherit;"&gt;&#x2014;&lt;/em&gt;&lt;/td&gt;&lt;td style="width: 1%; font-family: &amp;quot;Times New Roman&amp;quot;; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;/tbody&gt;&lt;/table&gt;

   &lt;p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"&gt;&#160;&lt;/p&gt;
   &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;"/&gt;
   &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;"&gt;&lt;i&gt;Restricted Stock Unit Awards&lt;/i&gt;&lt;/p&gt;
   &lt;p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"&gt;&#160;&lt;/p&gt;
   &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;"&gt;The Company issues restricted stock units ("RSU") to newly elected, non-executive members of the board of directors that vest in six, tri-monthly installments beginning 18 months after the respective grant date. The fair value of a RSU is equal to the fair market value price of the Company&#x2019;s common stock on the date of grant. RSU expense is recorded on a straight-line basis over the service period.&lt;/p&gt;
   &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;"&gt;&#160;&lt;/p&gt;
   &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin: 0pt; text-align: justify; text-indent: 45pt;"&gt;The following table summarizes activity related to RSU awards during the period indicated:&lt;/p&gt;
   &lt;p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"&gt;&#160;&lt;/p&gt;

    &lt;table border="0" cellpadding="0" cellspacing="0" class="finTable" style="width: 100%; font-size: 10pt; font-family: Times New Roman; text-indent: 0px;"&gt;&lt;tbody&gt;&lt;tr style="vertical-align: bottom;"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 66%;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td colspan="2" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0); width: 1%;"&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;&lt;b&gt;&lt;b&gt;Number of Units&lt;/b&gt;&lt;/b&gt;&lt;/p&gt; &lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td colspan="2" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0); width: 1%;"&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;&lt;b&gt;&lt;b&gt;Weighted average grant&lt;/b&gt;&lt;/b&gt;&lt;/p&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;&lt;b&gt;&lt;b&gt;date fair value&lt;/b&gt;&lt;/b&gt;&lt;/p&gt; &lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 66%;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"&gt;Balance at January 1, 2022&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 14%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;5,509&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;$&lt;/td&gt;&lt;td style="width: 14%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;34.78&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 66%;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"&gt;Vested (1)&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;&#160;&lt;/td&gt;&lt;td style="width: 14%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;(327&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; padding-bottom: 1px;"&gt;)&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 14%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;25.50&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 66%;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"&gt;Outstanding at March 31, 2022&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 14%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;5,182&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;$&lt;/td&gt;&lt;td style="width: 14%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;35.36&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
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   &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin: 0pt;"&gt;&#160;&lt;/p&gt;
   &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin: 0pt;"&gt;(&lt;em style="font: inherit;"&gt;1&lt;/em&gt;) The RSUs vested during the &lt;em style="font: inherit;"&gt;three&lt;/em&gt; months ended &lt;em style="font: inherit;"&gt; March 31, 2022 &lt;/em&gt;were settled on a hybrid basis. The Company withheld 120 shares of common stock and, in lieu of delivering such shares, paid the RSU holder an amount in cash equal to the fair market value of such shares on vesting date, representing the holder's approximate tax liability associated with such vesting amount in cash equal to the fair market value of such shares on vesting date, representing the holder's approximate tax liability associated with such vesting.&lt;/p&gt;
   &lt;p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"&gt;&#160;&lt;/p&gt;
   &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;"&gt;The Company recognized approximately $16,000 and $5,000 in expense related to these awards during the &lt;em style="font: inherit;"&gt;three&lt;/em&gt; months ended &lt;em style="font: inherit;"&gt; March&#160;&lt;/em&gt;&lt;em style="font: inherit;"&gt;31,&lt;/em&gt; &lt;em style="font: inherit;"&gt;2022&lt;/em&gt; and &lt;em style="font: inherit;"&gt; March 31, 2021, &lt;/em&gt;respectively. At &lt;em style="font: inherit;"&gt; March&#160;&lt;/em&gt;&lt;em style="font: inherit;"&gt;31,&lt;/em&gt; &lt;em style="font: inherit;"&gt;2022,&lt;/em&gt; there was approximately $0.1 million of unrecognized compensation cost that will be recognized over a weighted average period of 1.90 years.&lt;/p&gt;
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&lt;tr style="vertical-align: bottom;"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td colspan="2" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;&lt;b&gt;&lt;b&gt;2022&lt;/b&gt;&lt;/b&gt;&lt;/p&gt; &lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td colspan="2" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;"&gt;&lt;b&gt;&lt;b&gt;2021&lt;/b&gt;&lt;/b&gt;&lt;/p&gt; &lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 70%;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"&gt;Research and development&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;$&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;58,892&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;$&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;33,000&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"&gt;General and administrative&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;&#160;&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;219,239&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;&#160;&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;148,280&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 1px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"&gt;Total stock-based compensation expense&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;$&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;278,131&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;$&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;181,280&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
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&lt;tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 40%;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"&gt;Balance at January 1, 2022&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;72,454&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;$&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;265.85&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="text-align: right; font-family: Times New Roman; font-size: 10pt; width: 12%;"&gt;&lt;em style="font: inherit;"&gt;&#160;&lt;/em&gt;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="text-align: right; font-family: Times New Roman; font-size: 10pt; width: 12%;"&gt;&lt;em style="font: inherit;"&gt;&#160;&lt;/em&gt;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 40%;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"&gt;Granted&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;48,300&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;12.00&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="text-align: right; font-family: Times New Roman; font-size: 10pt; width: 12%;"&gt;&lt;em style="font: inherit;"&gt;&#160;&lt;/em&gt;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="text-align: right; font-family: Times New Roman; font-size: 10pt; width: 12%;"&gt;&lt;em style="font: inherit;"&gt;&#160;&lt;/em&gt;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 40%;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"&gt;Cancelled/forfeited&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;&#160;&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"&gt;(4,190&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; padding-bottom: 1px;"&gt;)&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;75.33&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="text-align: right; font-family: Times New Roman; font-size: 10pt; width: 12%;"&gt;&lt;em style="font: inherit;"&gt;&#160;&lt;/em&gt;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="text-align: right; font-family: Times New Roman; font-size: 10pt; width: 12%;"&gt;&lt;em style="font: inherit;"&gt;&#160;&lt;/em&gt;&lt;/td&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 1%;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 40%;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"&gt;Outstanding at March 31, 2022&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;&#160;&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;116,564&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;$&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;164.31&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;8.89&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;$&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;23,163&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 40%;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"&gt;Exercisable at March 31, 2022&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;&#160;&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;52,849&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;$&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;346.79&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;8.13&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;$&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;1,956&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"&gt;&lt;td style="font-family: Times New Roman; font-size: 10pt; width: 40%;"&gt; &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;"&gt;Vested and expected to vest at March 31, 2022&lt;/p&gt; &lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;&#160;&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;116,564&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;$&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);"&gt;164.31&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; padding-bottom: 3px; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;8.89&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;$&lt;/td&gt;&lt;td style="width: 12%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;23,163&lt;/td&gt;&lt;td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;
&lt;/tbody&gt;&lt;/table&gt;
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   &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;"&gt;The Company has established its &lt;em style="font: inherit;"&gt;401&lt;/em&gt;(k) Plan, which covers all employees who qualify under the terms of the plan. Eligible employees &lt;em style="font: inherit;"&gt; may &lt;/em&gt;elect to contribute to the &lt;em style="font: inherit;"&gt;401&lt;/em&gt;(k) Plan up to 90% of their compensation, limited by the IRS-imposed maximum. The Company provides a safe harbor match with a maximum amount of 4% of the participant&#x2019;s compensation. The Company made matching contributions under the &lt;em style="font: inherit;"&gt;401&lt;/em&gt;(k) Plan of approximately $27,000 and $16,000 for the &lt;em style="font: inherit;"&gt;three&lt;/em&gt; months ended &lt;em style="font: inherit;"&gt; March 31, 2022 &lt;/em&gt;and &lt;em style="font: inherit;"&gt;2021,&lt;/em&gt; respectively.&lt;/p&gt;
   &lt;p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"&gt;&#160;&lt;/p&gt;
   &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin: 0pt; text-indent: 9pt;"&gt;&lt;i&gt;Legal Proceedings&lt;/i&gt;&lt;/p&gt;
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   &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;"&gt;On &lt;em style="font: inherit;"&gt; August 7, 2014, &lt;/em&gt;a complaint was filed in the Superior Court of Los Angeles County, California by Paul Feller, the former Chief Executive Officer of the Company&#x2019;s legal predecessor under the caption Paul Feller v. RestorGenex Corporation, Pro Sports &amp;amp; Entertainment, Inc., ProElite, Inc. and Stratus Media Group, GmbH (Case &lt;em style="font: inherit;"&gt;No.&lt;/em&gt; &lt;em style="font: inherit;"&gt;BC553996&lt;/em&gt;). The complaint asserts various causes of action, including, among other things, promissory fraud, negligent misrepresentation, breach of contract, breach of employment agreement, breach of the covenant of good faith and fair dealing, violations of the California Labor Code and common counts. The plaintiff is seeking, among other things, compensatory damages in an undetermined amount, punitive damages, accrued interest and an award of attorneys&#x2019; fees and costs. On &lt;em style="font: inherit;"&gt; December 30, 2014, &lt;/em&gt;the Company filed a petition to compel arbitration and a motion to stay the action. On &lt;em style="font: inherit;"&gt; April 1, 2015, &lt;/em&gt;the plaintiff filed a petition in opposition to the Company&#x2019;s petition to compel arbitration and a motion to stay the action. After a related hearing on &lt;em style="font: inherit;"&gt; April 14, 2015, &lt;/em&gt;the court granted the Company&#x2019;s petition to compel arbitration and a motion to stay the action. On &lt;em style="font: inherit;"&gt; January 8, 2016, &lt;/em&gt;the plaintiff filed an arbitration demand with the American Arbitration Association. On &lt;em style="font: inherit;"&gt; November 19, 2018 &lt;/em&gt;at an Order to Show Cause Re Dismissal Hearing, the court found sufficient grounds &lt;em style="font: inherit;"&gt;not&lt;/em&gt; to dismiss the case and an arbitration hearing was scheduled, originally for &lt;em style="font: inherit;"&gt; November 2020 &lt;/em&gt;but later postponed due to the COVID-&lt;em style="font: inherit;"&gt;19&lt;/em&gt; pandemic and related restrictions on gatherings in the State of California. In addition, following the &lt;em style="font: inherit;"&gt; November 2018 &lt;/em&gt;hearing, an automatic stay was placed on the arbitration in connection with the plaintiff filing for personal bankruptcy protection. On &lt;em style="font: inherit;"&gt; October 22, 2021, &lt;/em&gt;following a determination by the bankruptcy trustee &lt;em style="font: inherit;"&gt;not&lt;/em&gt; to pursue the claims and release them back to the plaintiff, the parties entered into a stipulation to abandon arbitration and return the matter to state court. A case management conference was held on &lt;em style="font: inherit;"&gt; February 23, 2022 &lt;/em&gt;at which a trial date of &lt;em style="font: inherit;"&gt; May 24, 2023 &lt;/em&gt;was set, and the parties have agreed to stipulate to mediation in advance of the trial.&lt;/p&gt;
   &lt;p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"&gt;&#160;&lt;/p&gt;
   &lt;p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"/&gt;
   &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;"&gt;The Company believes the claims in this matter are without merit and intends to defend itself vigorously. However, at this stage, the Company is unable to predict the outcome and possible loss or range of loss, if any, associated with its resolution or any potential effect the matter &lt;em style="font: inherit;"&gt; may &lt;/em&gt;have on the Company&#x2019;s financial position. Depending on the outcome or resolution of this matter, it could have a material effect on the Company&#x2019;s financial position, results of operations and cash flows.&lt;/p&gt;
   &lt;p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"&gt;&#160;&lt;/p&gt;
   &lt;p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"/&gt;
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    <us-gaap:OperatingLeasePayments
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      decimals="INF"
      id="c84240946"
      unitRef="USD">9000</us-gaap:OperatingLeasePayments>
    <us-gaap:OperatingLeasePayments
      contextRef="d_2021-01-01_2021-03-31"
      decimals="INF"
      id="c84240947"
      unitRef="USD">31000</us-gaap:OperatingLeasePayments>
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    <us-gaap:DefinedContributionPlanEmployerMatchingContributionPercent
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    <us-gaap:DefinedContributionPlanEmployerDiscretionaryContributionAmount
      contextRef="d_2022-01-01_2022-03-31"
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    <us-gaap:DefinedContributionPlanEmployerDiscretionaryContributionAmount
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      unitRef="USD">16000</us-gaap:DefinedContributionPlanEmployerDiscretionaryContributionAmount>
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   &lt;table border="0" cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;width:100%;margin-left:auto;margin-right:auto;"&gt;&lt;tbody&gt;&lt;tr&gt;&lt;td style="vertical-align:top;width:9%;"&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;"&gt;&lt;b&gt;&lt;em style="font: inherit;"&gt;10.&lt;/em&gt;&lt;/b&gt;&lt;/p&gt; &lt;/td&gt;&lt;td style="vertical-align:top;width:91.6%;"&gt; &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;"&gt;&lt;b&gt;Subsequent Events&lt;/b&gt;&lt;/p&gt; &lt;/td&gt;&lt;/tr&gt;
&lt;/tbody&gt;&lt;/table&gt;
   &lt;p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"&gt;&#160;&lt;/p&gt;
   &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt;"&gt;&lt;i&gt;Special Meeting, Series C Preferred Stock Conversion, Charter Amendment, and Reverse Stock Split&lt;/i&gt;&lt;/p&gt;
   &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt;"&gt;&#160;&lt;/p&gt;
   &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;"&gt;On &lt;em style="font: inherit;"&gt; April 18, 2022, &lt;/em&gt;at the Special Meeting, the Company's stockholders approved an amendment to the Company&#x2019;s certificate of incorporation, as amended, to effect a reverse stock split of the Company&#x2019;s outstanding shares of common stock by a ratio of any whole number between &lt;em style="font: inherit;"&gt;1&lt;/em&gt;-for-2 and &lt;em style="font: inherit;"&gt;1&lt;/em&gt;-for-50, at any time prior to &lt;em style="font: inherit;"&gt; December 31, 2022, &lt;/em&gt;the implementation and timing thereof subject to the discretion of the Company&#x2019;s board of directors.&lt;/p&gt;
   &lt;p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"&gt;&#160;&lt;/p&gt;
   &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;"&gt;Following the completion of the Special Meeting, in accordance with Section &lt;em style="font: inherit;"&gt;8&lt;/em&gt;(a) of the Series C Certificate, the Company delivered to the holders of the Series C Preferred Stock written notice of the Company&#x2019;s intent to implement the Reverse Stock Split and the Mandatory Conversion (as defined in the Series C Certificate) of all 10,000 shares of Series C Preferred Stock outstanding into an aggregate of 200 shares of the Company&#x2019;s common stock.&lt;/p&gt;
   &lt;p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"&gt;&#160;&lt;/p&gt;
   &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin: 0pt; text-indent: 45pt; text-align: justify;"&gt;As described in further detail above under, &lt;i&gt;Note &lt;em style="font: inherit;"&gt;3.&lt;/em&gt; Basis of Presentation and Summary of Significant Accounting Policies&lt;/i&gt;, on &lt;em style="font: inherit;"&gt; April 18, 2022, &lt;/em&gt;following the completion of the Special Meeting and the Series C Preferred Stock conversion, &#160;the Company implemented the Reverse Stock Split at a ratio of &lt;em style="font: inherit;"&gt;1&lt;/em&gt;-for-50 and beginning with the opening of trading on &lt;em style="font: inherit;"&gt; April 19, 2022, &lt;/em&gt;the Company&#x2019;s common stock was available for trading on the Nasdaq Capital Market on a Reverse Stock Split adjusted basis.&lt;/p&gt;
   &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt;"&gt;&#160;&lt;/p&gt;
   &lt;p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;"&gt;&lt;i&gt;Nasdaq Bid Price Requirement Compliance&lt;/i&gt;&lt;/p&gt;
   &lt;p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"&gt;&#160;&lt;/p&gt;
   &lt;p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 45pt;"&gt;On &lt;em style="font: inherit;"&gt; May 3, 2022, &lt;/em&gt;the Company received a written notice from the Nasdaq Staff confirming that the Company has regained compliance with Nasdaq Listing Rule &lt;em style="font: inherit;"&gt;5550&lt;/em&gt;(a)(&lt;em style="font: inherit;"&gt;2&lt;/em&gt;) because the bid price for the Company&#x2019;s common stock had closed above &lt;em style="font: inherit;"&gt;$1.00&lt;/em&gt; per share for the previous &lt;em style="font: inherit;"&gt;ten&lt;/em&gt; (&lt;em style="font: inherit;"&gt;10&lt;/em&gt;) consecutive business days ending &lt;em style="font: inherit;"&gt; May 2, 2022. &lt;/em&gt;As previously reported, on &lt;em style="font: inherit;"&gt; May 6, 2021, &lt;/em&gt;the Company received a written notice from the Nasdaq Staff indicating that the Company was &lt;em style="font: inherit;"&gt;not&lt;/em&gt; in compliance with Nasdaq Listing Rule &lt;em style="font: inherit;"&gt;5550&lt;/em&gt;(a)(&lt;em style="font: inherit;"&gt;2&lt;/em&gt;) because the bid price for the Company&#x2019;s common stock had closed below &lt;em style="font: inherit;"&gt;$1.00&lt;/em&gt; per share for the previous &lt;em style="font: inherit;"&gt;30&lt;/em&gt; consecutive business day. The &lt;em style="font: inherit;"&gt; May 3, 2022 &lt;/em&gt;letter confirmed this matter is now closed.&lt;/p&gt;
   &lt;p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"&gt;&#160;&lt;/p&gt;


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        <link:footnote id="f6702b564-318f-4dab-9dd6-82ab3e925c14" xlink:label="f6702b564-318f-4dab-9dd6-82ab3e925c14" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-us">The RSUs vested during the three months ended March 31, 2022 were settled on a hybrid basis. The Company withheld 120 shares of common stock and, in lieu of delivering such shares, paid the RSU holder an amount in cash equal to the fair market value of such shares on vesting date, representing the holder's approximate tax liability associated with such vesting amount in cash equal to the fair market value of such shares on vesting date, representing the holder's approximate tax liability associated with such vesting.

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end
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
