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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, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total stock compensation expense | $ 824 | $ 2,613 | $ 1,653
Executives |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total stock compensation expense | 778 | 1,754 | 880
Executive forfeitures | (823) | 0 | 0
Board of Directors |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total stock compensation expense | $ 869 | $ 859 | $ 773

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