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Supporting Financial Information - Equipment and Improvements, Net (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Sep. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]      
Furniture and equipment $ 958   $ 958
Computer equipment 1,262   1,262
Computer software 4,353   4,353
Leasehold improvements 1,595   1,595
Total equipment and improvements 8,168   8,168
Less accumulated depreciation and amortization (6,595)   (6,256)
Equipment and improvements, net 1,573   $ 1,912
Depreciation expense $ 300 $ 400