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Summary of Significant Accounting Policies - Comprehensive Loss (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended 15 Months Ended
Dec. 31, 2018
Dec. 31, 2019
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Accounting Policies [Abstract]          
Foreign currency exchange translation adjustment $ 5,568 $ (6,797) $ 6,071 $ (802) $ (802)