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Intangible Assets - Schedule of Future Amortization Amounts During the Remaining Life (Details) - USD ($)	Mar. 31, 2021	Dec. 31, 2020
Total	$ 56,831	$ 113,660
Covenant Not to Compete [Member]
2021	56,831
2022 and thereafter
Total	$ 56,831	$ 113,660

X

- Definition

Finite-lived intangible asset, expected amortization, year two, and after.

+ References

No definition available.

+ Details

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Namespace Prefix:	CLSN_
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Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

+ Details

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X

- Definition

Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 926
-SubTopic 20
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=120154696&loc=d3e54445-107959

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	instant

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- Details

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Namespace Prefix:
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Balance Type:
Period Type: