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Earn-out Milestone Liability - Schedule of Changes in Earn-out Milestone Liability (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Hercules Warrant [Member] |  |
Earn-out liabilities, beginning balance | $ 5,717,709 | $ 8,907,664
Non-cash gain loss from the adjustment for the change in fair value | 1,300,291 | (3,189,955)
Earn-out liabilities, ending balance | $ 7,018,000 | $ 5,717,709

X
- Definition Earn-out liabilities, beginning balance. + References No definition available. + Details
Name: | CLSN_EarnoutMilestoneLiability
Namespace Prefix: | CLSN_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | CLSN_EarnoutMilestoneLiabilityAbstract
Namespace Prefix: | CLSN_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of gain (loss) from the change in the fair value of earn-out milestone liability. + References No definition available. + Details
Name: | CLSN_GainLossFromChangeInFairValueOfEarnOutMilestoneLiability
Namespace Prefix: | CLSN_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration