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Taxes - Components of provision for income taxes (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Current income tax expense:    
Foreign $ 1,333 $ 1,467
Federal 71 121
State and local   45
Current income tax expense 1,404 1,633
Deferred income tax expense (benefit):    
Foreign (323) 312
Federal 10 (139)
State and local   2
Deferred income tax expense (benefit) (313) 175
Provision for income taxes $ 1,091 $ 1,808