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Collaboration and License Agreements - Janssen Pharmaceuticals, Inc. (Details) |  | 12 Months Ended |
--- | --- | --- | ---
Oct. 03, 2018 USD ($) obligation | Sep. 30, 2022 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | May 31, 2021 USD ($)
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |
Proceeds from the issuance of common stock |  | $ 0 | $ 0 | $ 250,479,000 |
Deferred revenue |  | 74,099,000 | 111,055,000 |  |
Revenues |  | 243,231,000 | 138,287,000 | $ 87,992,000 |
Collaboration and License agreements |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |
Initial transaction price | $ 252,700,000 |  |  |  |
Janssen | Collaboration and License agreements |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |
Cash received as due under collaboration agreement | 175,000,000 |  |  |  |
JJDC | Common Stock Purchase Agreement |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |
Proceeds from the issuance of common stock | 75,000,000 |  |  |  |
Janssen |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |
Milestone payment | 73,000,000 |  |  |  |
Development, regulatory and sales milestones payments |  | 4,900,000,000 |  |  |
Janssen | License Agreement | Maximum |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |
Development, regulatory and sales milestones payments | 1,600,000,000 |  |  |  |
Janssen | Collaboration Agreement | Maximum |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |
Development, regulatory and sales milestones payments | 600,000,000 |  |  |  |
Janssen | J N J3989 A R O H B V Agreement |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |
Milestone payment | $ 25,000,000 |  |  |  |
Number of distinct performance obligations | obligation | 1 |  |  |  |
Contract assets |  | 0 |  |  |
Deferred revenue |  | 0 |  |  |
Janssen | JNJ-75220795 (ARO-JNJ1) |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |
Milestone payment |  |  | 10,000,000 |  | $ 10,000,000
Contract assets |  | 100,000 |  |  |
Deferred revenue |  | 0 |  |  |
Revenues |  | $ 3,400,000 | $ 500,000 |  |

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