Income Taxes - Components of Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Current:
Federal	$ 0	$ 0
State	46	9
Foreign	321	185
Total current expense	367	194
Deferred:
Federal	(18)	6
State	(1)	6
Foreign	(5)	7
Total deferred expense	(24)	19
Total income tax expense	$ 343	$ 213