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Collaboration and License Agreements - Amgen, Inc - Additional Information (Detail) |  | 3 Months Ended |
--- | --- | --- | ---
Sep. 28, 2016 USD ($) Agreement $ / shares shares | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2018 USD ($)
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |
Proceeds from the issuance of common stock |  | $ 60,521,729 |  |
Revenues |  | 34,657,896 | $ 3,509,821 |
Contract liabilities |  | $ 124,925,638 |  | $ 600
Type of Revenue [Extensible List] |  | arwr:TechnologyLicensesCollaborativeResearchAndDevelopmentArrangementsResearchGrantsAndProductSalesMember | arwr:TechnologyLicensesCollaborativeResearchAndDevelopmentArrangementsResearchGrantsAndProductSalesMember |
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 |  |  |
Collaboration and License agreements | Amgen |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |
Agreement date | Sep. 28, 2016 |  |  |
Number of agreements | Agreement | 2 |  |  |
ARO-AMG1 Agreement | Amgen |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |
Additional amount of common stock shares agreed to sell upon exercise of option | $ 5,000,000 |  |  |
Number of trading days, used to calculate share price of Common Stock, surrounding option exercise date | 30 days |  |  |
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 | Maximum | Amgen |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |
Option payments, and development, regulatory and sales milestone payments. | $ 617,000,000 |  |  |
AMG 890 (ARO-LPA) and ARO-AMG1 Agreement | Amgen |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |
Revenues |  | $ 0 | $ 3,500,000 |
Contract liabilities |  | 100,000 |  |
Contract assets |  | $ 0 |  |
Type of Revenue [Extensible List] |  | us-gaap:LicenseAndServiceMember | us-gaap:LicenseAndServiceMember |

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