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Warrants - Schedule of Weighted Average Remaining Contractual Terms (Details)	9 Months Ended
	Sep. 30, 2020 $ / shares shares
Number of Warrants Issued	3,522,525
All Other Warrants [Member]
Number of Warrants Issued	3,853,566
Weighted Average Exercise Price | $ / shares	$ 1.35
Weighted Average Contractual Terms Remaining (in years)	5 years
EGWU, Inc [Member]
Number of Warrants Issued	200,000
Weighted Average Exercise Price | $ / shares	$ 0.01
Weighted Average Contractual Terms Remaining (in years)	0 years

X

- Definition

Weighted Average Exercise Price, Warrants issued

+ References

No definition available.

+ Details

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Namespace Prefix:	CLSN_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (e)(1)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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X

- Definition

Net number of non-option equity instruments granted to participants.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(1)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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- Details

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X

- Details

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