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Supporting Financial Information - Equipment and Improvements, Net (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Sep. 30, 2018
Property, Plant and Equipment [Line Items]          
Furniture and equipment $ 1,246   $ 1,246   $ 326
Computer equipment 1,002   1,002   751
Computer software 3,667   3,667   1,731
Leasehold improvements 1,595   1,595   66
Total equipment and improvements 7,510   7,510   2,874
Less accumulated depreciation and amortization (1,836)   (1,836)   (1,308)
Equipment and improvements, net 5,674   $ 5,674   $ 1,566
Minimum          
Property, Plant and Equipment [Line Items]          
Estimated useful of long-lived assets     3 years    
Maximum          
Property, Plant and Equipment [Line Items]          
Estimated useful of long-lived assets     7 years    
Leasehold Improvements | Minimum          
Property, Plant and Equipment [Line Items]          
Estimated useful of long-lived assets     3 years    
Leasehold Improvements | Maximum          
Property, Plant and Equipment [Line Items]          
Estimated useful of long-lived assets     7 years    
Equipment          
Property, Plant and Equipment [Line Items]          
Depreciation of equipment $ 300 $ 100 $ 500 $ 300