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Net Loss Per Common Share (Details Narrative) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Jun. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Share [Abstract]
Number of shares of common stock issuable upon exercise of warrants and equity awards	6,496,261	6,208,389	6,496,261	6,208,389

X

- Definition

Represents the total number of Shares of common stock issuable upon exercise of warrants and equity awards.

+ References

No definition available.

+ Details

Name:	CLSN_NumberOfSharesOfCommonStockIssuableUponExerciseOfWarrantsAndEquityAwards
Namespace Prefix:	CLSN_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_EarningsPerShareAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration