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Supporting Financial Information - Equipment and Improvements, Net (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Sep. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]          
Furniture and equipment $ 958   $ 958   $ 958
Computer equipment 1,484   1,484   1,262
Computer software 4,375   4,375   4,353
Leasehold improvements 1,595   1,595   1,595
Total equipment and improvements 8,412   8,412   8,168
Less: accumulated depreciation and amortization (7,057)   (7,057)   (6,256)
Equipment and improvements, net 1,355   1,355   $ 1,912
Depreciation expense $ 200 $ 400 $ 800 $ 1,200