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Taxes (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Current income tax expense:    
Foreign $ 594 $ 1,301
Federal 176 0
State and local 5 1
Current income tax expense 775 1,302
Deferred income tax expense (benefit):    
Foreign (97) (176)
Federal (393) 0
Deferred income tax expense (benefit) (490) (176)
Provision for income taxes $ 285 $ 1,126