Fair Value - Schedule of Changes in Fair Value of Financial Instruments Related to Level 3 Financial Instruments (Details) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Common Stock Warrant Liability [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	$ 474	$ 0
Initial fair value of instrument		1,457
Change in fair value	(2)	(133)
Reclassification From Liability to Equity	(305)
Ending balance	167	1,324
Clene Nanomedicine Contingent Earn-out [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	18,100	52,053
Initial fair value of instrument		0
Change in fair value	(8,253)	16,970
Reclassification From Liability to Equity	0
Ending balance	9,847	69,023
Initial Shareholders Contingent Earn-out [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	2,317	5,906
Initial fair value of instrument		0
Change in fair value	(1,054)	1,729
Reclassification From Liability to Equity	0
Ending balance	$ 1,263	$ 7,635