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Collaboration and License Agreements - Joint Venture and License Agreement with Visirna Therapeutics, Inc. (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Apr. 25, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |
Proceeds from upfront capital |  | $ 0 | $ 60,000 | $ 0
Visirna Therapeutics, Inc. | Variable Interest Entity, Primary Beneficiary |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |
Proceeds from upfront capital | $ 60,000 |  |  |

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