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Summary of Significant Accounting Policies - Comprehensive Loss (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Accounting Policies [Abstract]        
Foreign currency exchange translation adjustment $ (5,568) $ (6,071) $ 802 $ (2,942)