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Supporting Financial Information - Equipment and Improvements, Net (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Sep. 30, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]      
Furniture and equipment $ 893   $ 893
Computer equipment 2,730   2,316
Computer software 4,407   4,407
Leasehold improvements 1,614   1,614
Total equipment and improvements 9,644   9,230
Less: accumulated depreciation and amortization (7,769)   (7,526)
Equipment and improvements, net 1,875   $ 1,704
Depreciation expense $ 200 $ 300