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Derivative Instruments (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	Dec. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Jul. 31, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Issuance of derivative instrument							$ 700
Loss on derivative instruments			$ 15		$ 29	$ (29)
Clene Nanomedicine contingent earn-out	$ 64,700			$ 34,000		52,100
Initial shareholders contingent earn-out	$ 7,400	$ 4,200		4,200		$ 5,900
Gain (loss) on Clene Nanomedicine contingent earn-out		35,000		(18,100)
Gain (loss) on Initial Shareholders contingent earn-out		3,400		(1,700)
Warrant fair value				1,500
Change in fair value warrants		$ 400		$ 500

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- Definition

Changeinfairvaluewarrants

+ References

No definition available.

+ Details

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- Definition

It represents the gain (loss) on Clene Nanomedicine contingent earn-out.

+ References

No definition available.

+ Details

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- Definition

It represents amount of gain (loss) on Initial Shareholders contingent earn-out.

+ References

No definition available.

+ Details

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- Definition

It represents the amount of loss on derivative instruments.

+ References

No definition available.

+ Details

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Balance Type:	debit
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- Definition

It represents amount of warrant liability fair value.

+ References

No definition available.

+ Details

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Namespace Prefix:	clnn_
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- Definition

Fair value of contingent consideration in a business combination that is classified in shareholders' equity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

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- Definition

Fair value of the assets less the liabilities of a derivative or group of derivatives.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13433-108611

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- References

No definition available.

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- Definition

Amount of addition (reduction) to the amount at which an instrument classified in shareholders' equity could be incurred (settled) in a current transaction between willing parties.

+ References

No definition available.

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