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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
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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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- 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 + Details
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