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Supporting Financial Information - Equipment and Improvements, net (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Property, Plant and Equipment [Line Items]    
Furniture and equipment $ 1,262 $ 326
Computer equipment 1,043 751
Computer software 3,985 1,731
Leasehold improvements 1,595 66
Total equipment and improvements 7,885 2,874
Less accumulated depreciation and amortization (2,542) (1,308)
Equipment and improvements, net 5,343 1,566
Depreciation $ 1,200 $ 500
Minimum    
Property, Plant and Equipment [Line Items]    
Estimated useful lives of property and equipment 3 years  
Maximum    
Property, Plant and Equipment [Line Items]    
Estimated useful lives of property and equipment 7 years