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Collaboration and License Agreements - Amgen, Inc - Additional Information (Detail) $ in Thousands |  | 3 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 28, 2016 USD ($) Agreement | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Sep. 30, 2021 USD ($) | Jul. 31, 2020 USD ($)
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |
Revenues |  | $ 27,439 | $ 21,303 |  |
Contract liabilities |  | 108,652 |  | $ 111,055 |
Collaboration and License agreements | Amgen |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |
Agreement date | Sep. 28, 2016 |  |  |  |
Number of agreements | Agreement | 2 |  |  |  |
Cash received as due under collaboration agreement | $ 35,000 |  |  |  |
License Collaboration And Stock Purchase Agreement | Amgen |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |
Proceeds from the issuance of common stock | 21,500 |  |  |  |
Olpasiran and ARO-AMG1 Agreement | Amgen |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |
Milestone payments | $ 30,000 |  |  |  | $ 20,000
Revenues |  | 0 | $ 0 |  |
Contract liabilities |  | 0 |  |  |
Contract assets |  | 0 |  |  |
Olpasiran Agreement | Amgen | Maximum |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |
Additional remaining development regulatory and sales milestones payments |  | $ 400,000 |  |  |

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