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Fair Value Measurements - Additional Information (Details) - Level 3 - USD ($) | 12 Months Ended |
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amount invested in non-marketable convertible note |  | $ 2,000,000
Changes in fair value | $ 0 |

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