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Goodwill and Intangible Assets - Goodwill Rollforward (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Goodwill [Roll Forward]    
Balance at January 1 $ 15,408  
Impairment (8,732) $ 0
Foreign currency translation adjustment (84)  
Balance at December 31 $ 6,592 $ 15,408