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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, 2019 | Dec. 31, 2018
Hercules Warrant [Member] |  |
Earn-out liabilities, beginning balance | $ 8,907,664 | $ 12,538,525
Non-cash gain from the adjustment for the change in fair value included in net loss | (3,189,955) | (3,630,861)
Earn-out liabilities, ending balance | $ 5,117,709 | $ 8,907,664

X
- Definition The amount of earn-out milestone liability as of the balance sheet. + References No definition available. + Details
Name: | CLSN_EarnoutMilestoneLiability
Namespace Prefix: | CLSN_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- 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: | credit
Period Type: | duration