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Fair Value (Details) - Schedule of fair value hierarchy of liabilities measured at fair value on recurring basis - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Fair Value (Details) - Schedule of fair value hierarchy of liabilities measured at fair value on recurring basis [Line Items]    
Notes payable $ 983 $ 1,296
Warrant liability 910  
Clene Nanomedicine contingent earn-out 33,981 52,053
Initial Shareholders contingent earn-out 4,196 5,906
Level 1 [Member]    
Fair Value (Details) - Schedule of fair value hierarchy of liabilities measured at fair value on recurring basis [Line Items]    
Notes payable 983 1,296
Warrant liability  
Clene Nanomedicine contingent earn-out
Initial Shareholders contingent earn-out
Level 2 [Member]    
Fair Value (Details) - Schedule of fair value hierarchy of liabilities measured at fair value on recurring basis [Line Items]    
Notes payable
Warrant liability  
Clene Nanomedicine contingent earn-out
Initial Shareholders contingent earn-out
Level 3 [Member]    
Fair Value (Details) - Schedule of fair value hierarchy of liabilities measured at fair value on recurring basis [Line Items]    
Notes payable
Warrant liability 910  
Clene Nanomedicine contingent earn-out 33,981 52,053
Initial Shareholders contingent earn-out $ 4,196 $ 5,906