Income Taxes - Income tax provision (benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Current
Federal	$ (113)	$ (190)
State	1	1
Foreign	198	194
Total current	86	5
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]
Federal	267	(7)
State	(253)	86
Foreign	(1)	(7)
Total deferred	519	(100)
Total income tax provision (benefit)	$ 605	$ (95)

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