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Stockholders' Equity - Additional Information (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Sep. 30, 2020
Class Of Stock [Line Items] |  |  |
Repurchase of common stock | 33,926 | 106,567 |
Payment for repurchase of common stock | $ 383 | $ 759 |
Series E Convertible Preferred Stock |  |  |
Class Of Stock [Line Items] |  |  |
Preferred stock, outstanding | 47,840 |  | 47,840
Repurchased shares of preferred stock |  | 30,000 |
Aggregate purchase price of convertible preferred stock |  | $ 3 |

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