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Summary of Significant Accounting Policies - Stock-Based Compensation (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total stock-based compensation expense | $ 1,230 | $ 1,306 | $ 824
Executive forfeiture |  |  | (823)
Executives |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total stock-based compensation expense | 349 | 497 | 778
Executive forfeiture |  |  | (823)
Management |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total stock-based compensation expense | 37 | 76 |
Board of Directors |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total stock-based compensation expense | $ 844 | $ 733 | $ 869

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