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Stock-based Compensation - Summary of Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019
Share-based Payment Arrangement [Abstract] |  |  |  |
Stock-based compensation expense | $ 899 | $ 2,180 | $ 3,210 | $ 4,294

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