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Organization and Significant Accounting Policies - Additional Information (Detail) |  |  | 1 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Oct. 03, 2018 USD ($) Target | Sep. 28, 2016 USD ($) | Dec. 31, 2019 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Jul. 31, 2020 USD ($) | Sep. 30, 2019 USD ($)
Organization And Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Proceeds from the issuance of common stock |  |  | $ 250,500,000 | $ 250,478,974 | $ 60,521,729 |  |
Cash and cash equivalents |  |  |  | 219,322,617 |  |  | $ 221,804,128
Restricted Cash |  |  |  | 1,800,000 |  |  |
Short term investments |  |  |  | 67,709,263 |  |  | 36,899,894
Long term investments |  |  |  | 177,529,881 |  |  | $ 44,175,993
Net increase (decrease) in cash and investments |  |  |  | 161,700,000 |  |  |
Right-of-use assets |  |  |  | 16,522,013 |  |  |
Right-of-use liabilities |  |  |  | 21,371,677 |  |  |
Janssen | JNJ-3989 (ARO-HBV) Agreement |  |  |  |  |  |  |
Organization And Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Milestone payment | $ 25,000,000 |  |  | 25,000,000 |  |  |
Janssen | Collaboration Agreement |  |  |  |  |  |  |
Organization And Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Number of additional targets for development and sales milestone payments | Target | 3 |  |  |  |  |  |
Janssen and JJDC | Collaboration and License agreements |  |  |  |  |  |  |
Organization And Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Cash received as due under agreement | $ 175,000,000 |  |  |  |  |  |
JJDC | Common Stock Purchase Agreement |  |  |  |  |  |  |
Organization And Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Proceeds from the issuance of common stock | 75,000,000 |  |  |  |  |  |
Amgen | License Collaboration and Stock Purchase Agreement |  |  |  |  |  |  |
Organization And Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Cash received as due under agreement |  | $ 35,000,000 |  |  |  |  |
Proceeds from the issuance of common stock |  | 21,500,000 |  |  |  |  |
Amgen | AMG-890 (ARO-LPA) Agreement |  |  |  |  |  |  |
Organization And Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Milestone payment |  | $ 10,000,000 |  |  |  |  |
Maximum | Janssen | License Agreement |  |  |  |  |  |  |
Organization And Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Development regulatory and sales milestones payments | 1,600,000,000 |  |  |  |  |  |
Maximum | Janssen | Collaboration Agreement |  |  |  |  |  |  |
Organization And Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Development regulatory and sales milestones payments | $ 1,900,000,000 |  |  |  |  |  |
Maximum | Amgen | AMG-890 (ARO-LPA) Agreement |  |  |  |  |  |  |
Organization And Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Development regulatory and sales milestones payments |  |  |  | $ 420,000,000 |  |  |
Subsequent Event | Amgen |  |  |  |  |  |  |
Organization And Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Milestone payment |  |  |  |  |  | $ 20,000,000 |

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