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Property and Equipment, Net - Depreciation (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Property, Plant and Equipment [Abstract]        
Depreciation $ 645 $ 1,709 $ 1,009 $ 478