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Collaboration and License Agreements - Horizon Therapeutics Ireland DAC (Details) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jun. 18, 2021 obligation bundle | Jul. 31, 2021 USD ($) | Mar. 31, 2023 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2021 USD ($)
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |
Revenues |  |  |  | $ 240,735 | $ 243,231 | $ 138,287
Horizon | Horizon License Agreement |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |
Number of distinct performance obligations | obligation | 1 |  |  |  |  |
Number of distinct bundle | bundle | 1 |  |  |  |  |
Initial transaction price |  | $ 40,000 |  |  |  |
Upfront milestone payment received |  |  | $ 15,000 |  |  |
Revenues |  |  |  | $ 1,500 | $ 2,500 |

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