Income Taxes - Components of Income Tax Benefit (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
United States federal income taxes:
Deferred	$ 37	$ 37	$ (561)
Foreign income taxes:
Current	7	74	34
Deferred	(215)	(204)	(230)
State income taxes:
Deferred	11	11	(173)
Total income tax benefit from continuing operations	$ (160)	$ (82)	$ (930)