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Collaboration and License Agreements - Takeda Pharmaceuticals U.S.A., Inc - Additional Information (Detail) $ in Thousands |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Oct. 07, 2020 USD ($) Obligation Bundle | Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Jan. 31, 2021 USD ($) | Sep. 30, 2020 USD ($)
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |
Revenues |  | $ 45,891 | $ 27,376 | $ 100,004 | $ 80,359 |  |
Contract liabilities, current deferred revenue |  | 150,934 |  | 150,934 |  |  | $ 19,291
Deferred revenue, net of current portion |  | 79,749 |  | 79,749 |  |  |
Takeda License Agreement | License and Co-Funding Agreement |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |
Agreement date | Oct. 07, 2020 |  |  |  |  |  |
Ratio of Profit Sharing Structure for United States Commercialization | 50/50 profit sharing |  |  |  |  |  |
Cash received as due under collaboration agreement |  |  |  |  |  | $ 300,000 |
Number of distinct bundle | Bundle | 1 |  |  |  |  |  |
Number of distinct performance obligations | Obligation | 1 |  |  |  |  |  |
Initial transaction price | $ 300,000 |  |  |  |  |  |
Revenues |  | 35,700 | $ 0 | 69,300 | $ 0 |  |
Contract assets |  | 0 |  | 0 |  |  |
Contract liabilities, current deferred revenue |  | 150,900 |  | 150,900 |  |  |
Deferred revenue, net of current portion |  | $ 79,700 |  | $ 79,700 |  |  |
Takeda License Agreement | Minimum | License and Co-Funding Agreement |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |
Percentage of eligible to receive tiered royalties on net sales | 20.00% |  |  |  |  |  |
Takeda License Agreement | Maximum | License and Co-Funding Agreement |  |  |  |  |  |  |
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 | $ 740,000 |  |  |  |  |  |

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