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Celsion Employee Benefit Plans (Details Narrative) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Postemployment Benefits [Abstract]
Maximum annual contributions per employee, percent	3.00%
Matching contributions of employee	$ 111,000	$ 106,000
Discretionary contribution	$ 178,000
Discretionary contribution, rate	6.00%

X

- Definition

Amount of discretionary contributions made by an employer as a percentage of each participants annual salary to a defined contribution plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	CLSN_
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Period Type:	duration

X

- Definition

Amount of discretionary contributions made by an employer to a defined contribution plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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X

- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Maximum amount the employee may contribute to a defined contribution plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

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