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Goodwill and Intangible Assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Goodwill [Line Items]      
Balance   $ 2,832 $ 2,734
Foreign currency translation adjustment   (107) 98
Goodwill impairment $ (675) (675) 0
Balance   $ 2,050 $ 2,832