Income Taxes - Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Tax benefit at federal statutory rate	$ (3,836)	$ (8,957)	$ (8,316)
State and local taxes, net of federal benefit	(239)	72	65
Foreign tax rate differential	207	136	98
Stock-based compensation	(22,071)	4,001	2,602
Unrealized loss on warrant liability	3,150	0	0
Nondeductible/nontaxable items	473	149	395
Unrecognized tax positions	(40)	119	257
Change in valuation allowance	21,969	5,578	5,564
GILTI	0	199	270
162(m) limitation	4,927	0	0
Warrant exercise	(3,419)	0	0
Other	181	(386)	(142)
Total income tax expense	$ 1,302	$ 911	$ 793