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Goodwill and Intangible Assets - Carrying Amount of Goodwill (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Goodwill and Intangible Assets    
Balance $ 2,050 $ 2,832
Foreign currency translation adjustment 58 (107)
Goodwill impairment 0 (675)
Balance $ 2,108 $ 2,050