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Fair Value (Details) - Schedule of changes in fair value of financial liabilities related to the notes payable, the derivative instrument, the preferred stock warrants, and the contingent earn-outs - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Notes Payable [Member]
Fair Value (Details) - Schedule of changes in fair value of financial liabilities related to the notes payable, the derivative instrument, the preferred stock warrants, and the contingent earn-outs [Line Items]
Beginning balance	$ 1,296	$ 640
Ending balance	983	963
Initial fair value of instrument
Issuance of convertible promissory notes
Change in fair value	(313)	323
Extinguishment of derivative liability in connection with extinguishment of convertible promissory notes
Clene Nanomedicine Contingent Earn-out [Member]
Fair Value (Details) - Schedule of changes in fair value of financial liabilities related to the notes payable, the derivative instrument, the preferred stock warrants, and the contingent earn-outs [Line Items]
Beginning balance	52,053
Ending balance	33,981
Initial fair value of instrument
Change in fair value	(18,072)
Initial Shareholders Contingent Earn-out [Member]
Fair Value (Details) - Schedule of changes in fair value of financial liabilities related to the notes payable, the derivative instrument, the preferred stock warrants, and the contingent earn-outs [Line Items]
Beginning balance	5,906
Ending balance	4,196
Initial fair value of instrument
Change in fair value	(1,710)
Warrant Liability [Member]
Fair Value (Details) - Schedule of changes in fair value of financial liabilities related to the notes payable, the derivative instrument, the preferred stock warrants, and the contingent earn-outs [Line Items]
Beginning balance
Ending balance	910
Initial fair value of instrument	1,457
Change in fair value	$ (547)
Derivative Instrument [Member]
Fair Value (Details) - Schedule of changes in fair value of financial liabilities related to the notes payable, the derivative instrument, the preferred stock warrants, and the contingent earn-outs [Line Items]
Beginning balance
Ending balance
Issuance of convertible promissory notes		705
Change in fair value		(29)
Extinguishment of derivative liability in connection with extinguishment of convertible promissory notes		(676)
Preferred Stock Warrants [Member]
Fair Value (Details) - Schedule of changes in fair value of financial liabilities related to the notes payable, the derivative instrument, the preferred stock warrants, and the contingent earn-outs [Line Items]
Beginning balance		3,213
Ending balance		10,591
Issuance of convertible promissory notes
Change in fair value		7,378
Extinguishment of derivative liability in connection with extinguishment of convertible promissory notes

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- References

No definition available.

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This value for issuance of convertible promissory notes.

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- Definition

This value for extinguishment of derivative liability in connection with extinguishment of convertible promissory note.

+ References

No definition available.

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This value for change in fair value.

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This value for initial fair value of instrument.

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- Definition

Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ 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 (c)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

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