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Collaboration and License Agreements - Amgen, Inc - Additional Information (Detail) |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 28, 2016 USD ($) Agreement | Dec. 31, 2019 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Jul. 31, 2020 USD ($) | Sep. 30, 2019 USD ($)
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |
Proceeds from the issuance of common stock |  | $ 250,500,000 |  |  | $ 250,478,974 | $ 60,521,729 |  |
Revenues |  |  | $ 27,375,778 | $ 42,696,636 | $ 80,359,211 | $ 125,502,807 |  |
Type of Revenue [Extensible List] |  |  | arwr:TechnologyLicensesCollaborativeResearchAndDevelopmentArrangementsResearchGrantsAndProductSalesMember | arwr:TechnologyLicensesCollaborativeResearchAndDevelopmentArrangementsResearchGrantsAndProductSalesMember | arwr:TechnologyLicensesCollaborativeResearchAndDevelopmentArrangementsResearchGrantsAndProductSalesMember | arwr:TechnologyLicensesCollaborativeResearchAndDevelopmentArrangementsResearchGrantsAndProductSalesMember |  |
Contract liabilities |  |  | $ 26,274,362 |  | $ 26,274,362 |  |  | $ 77,769,629
Amgen | Subsequent Event |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |
Milestone payment |  |  |  |  |  |  | $ 20,000,000 |
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 | $ 35,000,000 |  |  |  |  |  |  |
AMG-890 (ARO-LPA) Agreement | Amgen |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |
Milestone payment | 10,000,000 |  |  |  |  |  |  |
AMG-890 (ARO-LPA) Agreement | Amgen | Maximum |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |
Development regulatory and sales milestones payments |  |  | 420,000,000 |  | 420,000,000 |  |  |
License Collaboration and Stock Purchase Agreement | Amgen |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |
Proceeds from the issuance of common stock | $ 21,500,000 |  |  |  |  |  |  |
AMG 890 (ARO-LPA) and ARO-AMG1 Agreement | Amgen |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |
Revenues |  |  | $ 20,000,000.0 | $ 0 | $ 20,000,000.0 | $ 300,000 |  |
Type of Revenue [Extensible List] |  |  | us-gaap:LicenseAndServiceMember | us-gaap:LicenseAndServiceMember | us-gaap:LicenseAndServiceMember | us-gaap:LicenseAndServiceMember |  |
Contract liabilities |  |  | $ 0 |  | $ 0 |  |  |
Contract assets |  |  | $ 20,000,000.0 |  | $ 20,000,000.0 |  |  |
AMG 890 (ARO-LPA) and ARO-AMG1 Agreement | Amgen | Subsequent Event |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |
Milestone payment |  |  |  |  |  |  | $ 20,000,000 |

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