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Collaboration and License Agreements - Takeda Pharmaceutical Company Limited (Details) $ / shares in Units, $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Oct. 07, 2020 USD ($) bundle obligation | Sep. 30, 2023 USD ($) $ / shares | Sep. 30, 2022 USD ($) $ / shares | Sep. 30, 2021 USD ($) $ / shares | Mar. 31, 2023 USD ($)
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |
Development regulatory and sales milestones payments |  | $ 2,800,000 |  |  |
Revenues |  | $ 240,735 | $ 243,231 | $ 138,287 |
Diluted (in dollars per share) | $ / shares |  | $ (1.92) | $ (1.67) | $ (1.36) |
Deferred revenue |  | $ 866 | $ 74,099 |  |
Accrued expenses |  | 39,763 | $ 46,856 |  |
Takeda | License and Co-Funding 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 | $ 300,000 |  |  |  |
Milestone payment |  |  |  |  | $ 40,000
Revenues |  | $ 70,500 |  |  |
Diluted (in dollars per share) | $ / shares |  | $ 0.66 |  |  |
Deferred revenue |  | $ 900 |  |  |
Accrued expenses |  | 4,500 |  |  |
Takeda | License and Co-Funding Agreement | Minimum |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |
Percentage of eligible to receive tiered royalties on net sales | 20.00% |  |  |  |
Takeda | License and Co-Funding Agreement | Maximum |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |
Percentage of eligible to receive tiered royalties on net sales | 25.00% |  |  |  |
Development regulatory and sales milestones payments |  | $ 527,500 |  |  |

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