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Net Loss per Common Share (Details Narrative) - $ / shares	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Earnings Per Share [Abstract]
clsn_NumberOfSharesOfCommonStockIssuableUponExerciseOfWarrantsAndEquityAwards	9,325,228	8,560,124
Class of Warrant or Right, Exercise Price of Warrants or Rights	$ 0.01
Description of Business		200,000

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

- Definition

Number of shares of common stock issued in calculation basic loss per share.

+ References

No definition available.

+ Details

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

X

- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21475-112644

+ Details

Name:	us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

X

- References

No definition available.

+ Details

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