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Income Taxes - Components of provision for income taxes (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Current income tax expense:    
Foreign $ 1,065 $ 1,333
Federal 15 71
State and local (61)  
Current income tax expense (benefit) 1,019 1,404
Deferred income tax expense (benefit):    
Foreign (628) (323)
Federal 10 10
Deferred income tax expense (benefit) (618) (313)
Provision for income taxes $ 401 $ 1,091