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Collaboration and License Agreements - Amgen, Inc - Additional Information (Detail) |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 28, 2016 USD ($) Agreement | Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Sep. 30, 2020 USD ($) | Jul. 31, 2020 USD ($)
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |
Proceeds from the issuance of common stock |  |  |  |  | $ 250,479,000 |  |
Revenues |  | $ 45,891,000 | $ 27,376,000 | $ 100,004,000 | $ 80,359,000 |  |
Type of Revenue [Extensible List] |  | arwr:TechnologyLicensesCollaborativeResearchAndDevelopmentArrangementsResearchGrantAndProductSalesMember | arwr:TechnologyLicensesCollaborativeResearchAndDevelopmentArrangementsResearchGrantAndProductSalesMember | arwr:TechnologyLicensesCollaborativeResearchAndDevelopmentArrangementsResearchGrantAndProductSalesMember | arwr:TechnologyLicensesCollaborativeResearchAndDevelopmentArrangementsResearchGrantAndProductSalesMember |  |
Contract liabilities |  | $ 150,934,000 |  | $ 150,934,000 |  | $ 19,291,000 |
Collaboration and License agreements | Amgen Incorporated |  |  |  |  |  |  |
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 | $ 35,000,000.0 |  |  |  |  |  |
Olpasiran Agreement | Amgen Incorporated |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |
Milestone payments | 30,000,000.0 |  |  |  |  |  |
Olpasiran Agreement | Amgen Incorporated | Maximum |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |
Additional remaining development regulatory and sales milestones payments |  | 400,000,000.0 |  | 400,000,000.0 |  |  |
License Collaboration and Stock Purchase Agreement | Amgen Incorporated |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |
Proceeds from the issuance of common stock | $ 21,500,000 |  |  |  |  |  |
Olpasiran and ARO-AMG1 Agreement | Amgen Incorporated |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |
Milestone payments |  |  |  |  |  |  | $ 20,000,000.0
Revenues |  | $ 0 | $ 20,000,000.0 | $ 0 | $ 20,000,000.0 |  |
Type of Revenue [Extensible List] |  | us-gaap:LicenseAndServiceMember | us-gaap:LicenseAndServiceMember | us-gaap:LicenseAndServiceMember | us-gaap:LicenseAndServiceMember |  |
Contract assets |  | $ 0 |  | $ 0 |  |  |
Contract liabilities |  | $ 0 |  | $ 0 |  |  |

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