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Technology Development and Licensing Agreements (Details Narrative) - USD ($)		6 Months Ended
	Jan. 18, 2013	Jun. 30, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
[custom:UpfrontPaymentBeingRecognized]		$ 5,000,000
Hisun [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Proceeds from License Fees Received	$ 5,000,000
Deferred Revenue	$ 5,000,000.0
clsn_DeferredRevenueAmortizationPeriod	10 years

X

- Definition

The amortization period for deferred revenue.

+ References

No definition available.

+ Details

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

X

- Definition

Upfront Payment, being recognized.

+ References

No definition available.

+ Details

Name:	CLSN_UpfrontPaymentBeingRecognized
Namespace Prefix:	CLSN_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of deferred income and obligation to transfer product and service to customer for which consideration has been received or is receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(5))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Cash received from licensees for license fees during the current period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 25
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3536-108585

+ Details

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

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- Details

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Namespace Prefix:
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Balance Type:
Period Type: