Income Taxes - Summary of Income Tax Benefit (Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Current:
U.S. - State	$ (8)	$ (56)	$ (36)
Foreign	(137)	(76)	(150)
Total current	(145)	(132)	(186)
Deferred:
U.S. - Federal	(7)	32	(11)
U.S. - State	(1)	11	(1)
Total deferred	(8)	43	(12)
Total income tax benefit (expense)	$ (153)	$ (89)	$ (198)