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Collaboration and License Agreements - Janssen Pharmaceuticals, Inc. (Details) - USD ($) | Oct. 03, 2018 | Jun. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021 | May 31, 2021
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Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |
Development, regulatory and sales milestones payments |  | $ 3,400,000,000 |  |  |
Deferred revenue |  | 16,905,000 | $ 74,099,000 |  |
Collaboration and License agreements |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |
Initial transaction price | $ 252,700,000 |  |  |  |
JJDC | Collaboration and License agreements |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |
Upfront payment | 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 |  |  |  |
Janssen | License Agreement | Maximum |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |
Development, regulatory and sales milestones payments | 800,000,000 |  |  |  |
Janssen | JNJ-75220795 (ARO-JNJ1) |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |
Milestone payment |  |  |  | $ 10,000,000 | $ 10,000,000
Janssen | JNJ-3989 (ARO-HBV) Agreement |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |
Milestone payment | $ 25,000,000 |  |  |  |
Contract assets |  | 0 |  |  |
Deferred revenue |  | $ 0 |  |  |

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