XML 58 R48.htm IDEA: XBRL DOCUMENT
v3.19.2

Stockholders' Equity (Details Narrative) - USD ($) |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended | 69 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 04, 2018 | Aug. 31, 2018 | Feb. 01, 2013 | Aug. 13, 2019 | Sep. 30, 2018 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018 | Oct. 31, 2018
Shelf registration statement amount |  |  |  |  | $ 75,000,000 |  |  |  |  |
Proceeds from issuance of common stock |  |  |  |  |  |  | $ 4,464,060 | $ 1,236,584 |  |
Aspire Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |
Fair value of common stock issued as equity issuance costs and charged against paid in capital |  |  |  |  | $ 450,000 |  |  |  |  |
Aspire Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |
Aggregate offering price, additions |  | $ 15,000,000 |  |  |  |  |  |  |  |
Aggregate offering price, term |  | 24 months |  |  |  |  |  |  |  |
Maximum number of shares purchased per business day |  | 100,000 |  |  |  |  |  |  |  |
Aggregate offering price |  | $ 15,000,000 |  |  |  |  |  |  |  |
Aggregate offering price, description |  | The lowest sale price of the Company's common stock on the purchase date; or the arithmetic average of the three (3) lowest closing sale prices for the Company's common stock during the ten (10) consecutive trading days ending on the trading day immediately preceding the purchase date. |  |  |  |  |  |  |  |
Aspire purchase agreement, terms |  | In addition, on any date on which the Company submits a Purchase Notice to Aspire Capital in an amount equal to at least 100,000 shares, the Company also has the right, in its sole discretion, to present Aspire Capital with a volume-weighted average price purchase notice (each, a "VWAP Purchase Notice") directing Aspire Capital to purchase an amount of stock equal to up to 30% of the aggregate shares of the Company's common stock traded on its principal market on the next trading day (the "VWAP Purchase Date"), subject to a maximum number of shares the Company may determine. The purchase price per share pursuant to such VWAP Purchase Notice is generally 97% of the volume-weighted average price for the Company's common stock traded on its principal market on the VWAP Purchase Date. |  |  |  |  |  |  |  |
Maximum number of shares purchased per business day, additional |  | 2,000,000 |  |  |  |  |  |  |  |
Stock issued during period, shares, new issues |  | 164,835 |  |  |  |  | 1,900,000 |  | 100,000 |
Proceeds from issuance of common stock |  |  |  |  |  |  | $ 3,900,000 |  | $ 200,000 |
Aggregate value available for issuance |  |  |  |  |  |  | $ 10,500,000 |  |  |
Aspire Purchase Agreement [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |
Stock issued during period, shares, new issues |  |  |  | 300,000 |  |  |  |  |  |
Proceeds from issuance of common stock |  |  |  | $ 500,000 |  |  |  |  |  |
Capital on DemandTM Sales Agreement [Member] |  |  |  |  |  |  |  |  |  |
Aggregate offering price | $ 16,000,000 |  |  |  |  |  |  |  |  |
Aggregate offering price, description | (i) the sale of all shares of our common stock subject to the Sales Agreement, and (ii) the termination of the Capital on Demand Agreement by JonesTrading or Celsion. The Capital on Demand Agreement may be terminated by JonesTrading or the Company at any time upon 10 days' notice to the other party, or by JonesTrading at any time in certain circumstances, including the occurrence of a material adverse change in the Company. |  |  |  |  |  |  |  |  |
Commission percentage for gross proceeds from common stock | 3.00% |  |  |  |  |  |  |  |  |
Capital on Demand Agreement [Member] |  |  |  |  |  |  |  |  |  |
Stock issued during period, shares, new issues |  |  |  |  |  |  | 259,961 |  |  |
Proceeds from issuance of common stock |  |  |  |  |  |  | $ 600,000 |  |  |
Aggregate value available for issuance |  |  |  |  |  |  | $ 15,400,000 |  |  |
Capital on Demand Agreement [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |
Stock issued during period, shares, new issues |  |  |  | 85,000 |  |  |  |  |  |
Proceeds from issuance of common stock |  |  |  | $ 154,000 |  |  |  |  |  |
ATM Agreement [Member] |  |  |  |  |  |  |  |  |  |
Stock issued during period, shares, new issues |  |  |  |  |  | 457,070 |  |  |  | 1,784,396
Proceeds from issuance of common stock |  |  |  |  |  | $ 1,200,000 |  |  |  | $ 12,800,000
ATM Agreement [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Aggregate offering price |  |  | $ 25,000,000 |  |  |  |  |  |  |

X
- Definition Represents the additional aggregate offering price for shares of common stock that the Company may offer and sell through a sales agent. + References No definition available. + Details
Name: | CLSN_AggregateOfferingPriceAdditions
Namespace Prefix: | CLSN_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Aggregate offering price, description. + References No definition available. + Details
Name: | CLSN_AggregateOfferingPriceDescription
Namespace Prefix: | CLSN_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Aggregate offering price, term. + References No definition available. + Details
Name: | CLSN_AggregateOfferingPriceTerm
Namespace Prefix: | CLSN_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Aggregate offering price. + References No definition available. + Details
Name: | CLSN_AggregateOfferingPrices
Namespace Prefix: | CLSN_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Aggregate value available for issuance. + References No definition available. + Details
Name: | CLSN_AggregateValueAvailableForIssuance
Namespace Prefix: | CLSN_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Commission percentage for gross proceeds from common stock. + References No definition available. + Details
Name: | CLSN_CommissionPercentageForGrossProceedsFromCommonStock
Namespace Prefix: | CLSN_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Fair value of common stock issued as equity issuance costs and charged against paid in capital. + References No definition available. + Details
Name: | CLSN_FairValueOfCommonStockIssuedAsEquityIssuanceCostsAndChargedAgainstPaidInCapital
Namespace Prefix: | CLSN_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Maximum number of shares purchased per day. + References No definition available. + Details
Name: | CLSN_MaximumNumberOfSharesPurchasedPerDay
Namespace Prefix: | CLSN_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maximum number of shares purchased per day, additional. + References No definition available. + Details
Name: | CLSN_MaximumNumberOfSharesPurchasedPerDayAdditional
Namespace Prefix: | CLSN_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Aspire purchase agreement, terms. + References No definition available. + Details
Name: | CLSN_PurchaseAgreementTerms
Namespace Prefix: | CLSN_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Shelf Registration statement. + References No definition available. + Details
Name: | CLSN_ShelfRegistrationStatementAmount
Namespace Prefix: | CLSN_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The cash inflow from the additional capital contribution to the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585 + Details
Name: | us-gaap_ProceedsFromIssuanceOfCommonStock
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Number of new stock issued during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_StockIssuedDuringPeriodSharesNewIssues
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=CLSN_AspirePurchaseAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TypeOfArrangementAxis=CLSN_AspirePurchaseAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TypeOfArrangementAxis=CLSN_CapitalOnDemandTMSalesAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TypeOfArrangementAxis=CLSN_CapitalOnDemandAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TypeOfArrangementAxis=CLSN_ATMAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |