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Earn-out Milestone Liability - Schedule of Changes in Earn-out Milestone Liability (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018
Earn-out Milestone Liability |  |  |
Earn-out liabilities, beginning balance |  |  | $ 12,538,525
Non-cash charge from the adjustment for the change in fair value included in net loss | $ 4,100,000 | $ 1,300,000 | (3,567,671)
Earn-out liabilities, ending balance | $ 8,970,854 |  | $ 8,970,854

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