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Supporting Financial Information - Equipment and Improvements, Net (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Sep. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |  |  |
Furniture and equipment | $ 1,262 |  | $ 1,262 |  | $ 1,262
Computer equipment | 1,171 |  | 1,171 |  | 1,043
Computer software | 4,008 |  | 4,008 |  | 3,985
Leasehold improvements | 1,595 |  | 1,595 |  | 1,595
Total equipment and improvements | 8,036 |  | 8,036 |  | 7,885
Less accumulated depreciation and amortization | (4,267) |  | (4,267) |  | (2,542)
Equipment and improvements, net | 3,769 |  | 3,769 |  | $ 5,343
Depreciation expense | $ 500 | $ 300 | $ 1,700 | $ 500 |

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