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Summary of Significant Accounting Policies - Foreign Currency Translation (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Sep. 30, 2017
Accounting Policies [Abstract]      
Foreign currency translation gain (loss) $ 1,100 $ 4,000 $ (25)