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Income Taxes - Income Tax Expense (Benefit) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Income Tax Expense (Benefit) [Abstract]    
Current federal tax expense (benefit) $ 27 $ 240
Deferred federal income tax expense (benefit) 0 0
Federal income tax expense (benefit), continuing operations 27 240
Current state and local tax expense (benefit) 0 0
Deferred state and local income tax expense (benefit) 0 0
State and local income tax expense (benefit), continuing operations 0 0
Current foreign tax expense (benefit) 44 321
Deferred foreign income tax expense (benefit) (179) (387)
Foreign income tax expense (benefit), continuing operations (135) (66)
Current income tax expense (benefit) 71 561
Deferred income tax expense (benefit) (179) (387)
Income tax (benefit) expense $ (108) $ 174