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Summary of Operations and Significant Accounting Policies - Contract Liabilities - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |  |
Contract liabilities | $ 7,231 | $ 1,624 | $ 1,200 | $ 1,400
Contract revenue | $ 1,600 | $ 1,200 | $ 1,400 |

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