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Warrants - Schedule of Weighted Average Remaining Contractual Terms (Details)	3 Months Ended
	Mar. 31, 2019 $ / shares shares
Number of Warrants Issued | shares	200,000
Weighted Average Exercise Price | $ / shares	$ 0.01
Series DDD Warrants [Member]
Number of Warrants Issued | shares	1,166,250
Weighted Average Exercise Price | $ / shares	$ 6.20
Weighted Average Contractual Terms Remaining (in years)	4 days
All Other Warrants [Member]
Warrants Outstanding | shares	426,912
Weighted Average Exercise Price | $ / shares	$ 3.08
Weighted Average Contractual Terms Remaining (in years)	6 years
EGWU, Inc [Member]
Number of Warrants Issued | shares	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

Number of Warrants Issued, Warrants issued.

+ References

No definition available.

+ Details

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

X

- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References

No definition available.

+ Details

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Namespace Prefix:	CLSN_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

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=116856206&loc=d3e5070-113901

+ Details

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X

- Details

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X

- Details

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X

- Details

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