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Stockholders' Equity - Additional Information (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Sep. 30, 2019
Class Of Stock [Line Items] |  |  |
Treasury stock purchased, shares | 106,567 | 43,347 |
Payment for treasury stock | $ 759 | $ 321 |
Series E Convertible Preferred Stock |  |  |
Class Of Stock [Line Items] |  |  |
Preferred stock, outstanding | 47,840 |  | 77,840
Repurchased shares of preferred stock | 30,000 |  |
Aggregate purchase price of convertible preferred stock | $ 3 |  |

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