Income Taxes - Provision (Benefit) for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Current:
Federal	$ 0	$ 0
State	0	(76)
Foreign	4	16
Current, total	4	(60)
Deferred:
Federal	0	0
State	0	0
Deferred, total	0	0
Total income tax expense (benefit)	$ 4	$ (60)