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Net Loss per Common Share (Details Narrative) - $ / shares | 6 Months Ended
--- | ---
Jun. 30, 2021 | Jun. 30, 2020
Earnings Per Share [Abstract] |  |
clsn_NumberOfSharesOfCommonStockIssuableUponExerciseOfWarrantsAndEquityAwards | 9,325,228 | 8,560,124
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ 0.01 |
Description of Business |  | 200,000

X
- Definition Represents the total number of Shares of common stock issuable upon exercise of warrants and equity awards. + References No definition available. + Details
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Namespace Prefix: | CLSN_
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Balance Type: | na
Period Type: | duration

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- Definition Number of shares of common stock issued in calculation basic loss per share. + References No definition available. + Details
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Namespace Prefix: | CLSN_
Data Type: | xbrli:sharesItemType
Balance Type: | na
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X
- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21475-112644 + Details
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Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
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