Income Taxes - Income Tax Expense from Continuing Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Current:
Federal	$ 0	$ 0
State	25	87
Foreign	2,467	1,090
Total current income tax expense	2,492	1,177
Deferred:
Federal	0	0
State	0	62
Foreign	(58)	603
Deferred income taxes	(58)	665
Income tax expense	$ 2,434	$ 1,842