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Collaboration and License Agreements - Amgen, Inc - Additional Information (Detail) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 28, 2016 USD ($) Agreement $ / shares shares | Sep. 30, 2019 USD ($) $ / shares | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) $ / shares | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2019 USD ($) $ / shares | Sep. 30, 2018 USD ($) $ / shares | Sep. 30, 2017 USD ($) $ / shares
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock issued, price per share | $ / shares |  | $ 23.00 |  |  |  | $ 5.25 |  |  |  | $ 23.00 | $ 5.25 |
Proceeds from the issuance of common stock |  |  |  |  |  |  |  |  |  | $ 60,521,739 | $ 56,585,035 | $ 12,419,119
Revenues |  | $ 43,292,770 | $ 42,696,636 | $ 48,148,275 | $ 34,657,896 | $ 11,255,000 | $ 727,375 | $ 650,125 | $ 3,509,821 | 168,795,577 | 16,142,321 | $ 31,407,709
Contract liabilities |  | $ 77,769,629 |  |  |  | $ 600 |  |  |  | $ 77,769,629 | $ 600 |
Type of Revenue [Extensible List] |  | arwr:TechnologyLicensesCollaborativeResearchAndDevelopmentArrangementsResearchGrantsAndProductSalesMember | arwr:TechnologyLicensesCollaborativeResearchAndDevelopmentArrangementsResearchGrantsAndProductSalesMember | arwr:TechnologyLicensesCollaborativeResearchAndDevelopmentArrangementsResearchGrantsAndProductSalesMember | arwr:TechnologyLicensesCollaborativeResearchAndDevelopmentArrangementsResearchGrantsAndProductSalesMember | arwr:TechnologyLicensesCollaborativeResearchAndDevelopmentArrangementsResearchGrantsAndProductSalesMember | arwr:TechnologyLicensesCollaborativeResearchAndDevelopmentArrangementsResearchGrantsAndProductSalesMember | arwr:TechnologyLicensesCollaborativeResearchAndDevelopmentArrangementsResearchGrantsAndProductSalesMember | arwr:TechnologyLicensesCollaborativeResearchAndDevelopmentArrangementsResearchGrantsAndProductSalesMember | arwr:TechnologyLicensesCollaborativeResearchAndDevelopmentArrangementsResearchGrantsAndProductSalesMember | arwr:TechnologyLicensesCollaborativeResearchAndDevelopmentArrangementsResearchGrantsAndProductSalesMember | arwr:TechnologyLicensesCollaborativeResearchAndDevelopmentArrangementsResearchGrantsAndProductSalesMember
Amgen |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock issued, price per share | $ / shares |  |  |  |  |  |  |  |  |  |  |  | $ 7.16
Collaboration and License agreements | Amgen |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash received as due under collaboration agreement | $ 35,000,000 |  |  |  |  |  |  |  |  |  |  |
Proceeds from the issuance of common stock | 21,500,000 |  |  |  |  |  |  |  |  |  |  |
Collaboration and License agreements | Amgen | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Option payments, and development, regulatory and sales milestone payments | $ 617,000,000 |  |  |  |  |  |  |  |  |  |  |
Development regulatory and sales milestones payments |  | $ 420,000,000 |  |  |  |  |  |  |  | $ 420,000,000 |  |
Collaboration and License agreements | Amgen |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Agreement date | Sep. 28, 2016 |  |  |  |  |  |  |  |  |  |  |
Number of agreements | Agreement | 2 |  |  |  |  |  |  |  |  |  |  |
Collaboration and License agreements | Amgen | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Option payments, and development, regulatory and sales milestone payments | $ 617,000,000 |  |  |  |  |  |  |  |  |  |  |
Development regulatory and sales milestones payments | $ 420,000,000 |  |  |  |  |  |  |  |  |  |  |
AMG 890 (ARO-LPA) and ARO-AMG1 Agreement | Amgen |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 300,000 | $ 16,100,000 | $ 31,300,000
Contract assets |  | 0 |  |  |  |  |  |  |  | 0 |  |
Contract liabilities |  | $ 0 |  |  |  |  |  |  |  | $ 0 |  |
Type of Revenue [Extensible List] |  |  |  |  |  |  |  |  |  | us-gaap:LicenseAndServiceMember | us-gaap:LicenseAndServiceMember | us-gaap:LicenseAndServiceMember
Common Stock Purchase Agreement | Amgen |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Agreement date | Sep. 28, 2016 |  |  |  |  |  |  |  |  |  |  |
Shares issued | shares | 3,002,793 |  |  |  |  |  |  |  |  |  |  |
Stock issued, price per share | $ / shares | $ 7.16 |  |  |  |  |  |  |  |  |  |  |

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