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Goodwill and Intangible Assets (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Goodwill [Line Items]        
Balance     $ 2,832 $ 2,734
Foreign currency translation adjustment     (49) 42
Goodwill impairment $ (675) $ 0 (675) 0
Balance $ 2,108 $ 2,776 $ 2,108 $ 2,776