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Earn-out Milestone Liability - Schedule of Changes in Earn-out Milestone Liability (Details) - USD ($)	12 Months Ended
	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

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:	debit
Period Type:	duration