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Goodwill - Schedule of Goodwill (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Goodwill [Roll Forward]    
Beginning balance $ 19,614 $ 5,520
Adjustment to original acquisition allocation (17) (73)
Impact of foreign exchange (483) 342
Ending balance $ 19,114 $ 5,789