Fair Value (Details) - Schedule of fair value hierarchy of liabilities measured at fair value on recurring basis - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Fair Value (Details) - Schedule of fair value hierarchy of liabilities measured at fair value on recurring basis [Line Items]
Notes payable	$ 1,296	$ 640
Clene Nanomedicine contingent earn-out	52,053
Initial Shareholders contingent earn-out	5,906
Redeemable convertible preferred stock warrant liability		3,213
Level 1 [Member]
Fair Value (Details) - Schedule of fair value hierarchy of liabilities measured at fair value on recurring basis [Line Items]
Notes payable	1,296
Clene Nanomedicine contingent earn-out
Initial Shareholders contingent earn-out
Redeemable convertible preferred stock warrant liability
Level 2 [Member]
Fair Value (Details) - Schedule of fair value hierarchy of liabilities measured at fair value on recurring basis [Line Items]
Notes payable
Clene Nanomedicine contingent earn-out
Initial Shareholders contingent earn-out
Redeemable convertible preferred stock warrant liability
Level 3 [Member]
Fair Value (Details) - Schedule of fair value hierarchy of liabilities measured at fair value on recurring basis [Line Items]
Notes payable		640
Clene Nanomedicine contingent earn-out	52,053
Initial Shareholders contingent earn-out	$ 5,906
Redeemable convertible preferred stock warrant liability		$ 3,213