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Summary of Significant Accounting Policies - Comprehensive Loss (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Accounting Policies [Abstract]        
Foreign currency exchange translation adjustment $ 10,915 $ (9,044) $ (8,605) $ (12,865)