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Income Taxes - Components of provision for income taxes (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Current income tax expense:    
Foreign $ 728 $ 1,065
Federal 5 15
State and local 21 (61)
Current income tax expense (benefit) 754 1,019
Deferred income tax expense (benefit):    
Foreign 126 (628)
Federal (38) 10
Deferred income tax expense (benefit) 88 (618)
Provision for income taxes $ 842 $ 401