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Commitments and Contingencies - Additional Information (Details) ft² in Thousands |  | 12 Months Ended
--- | --- | ---
Dec. 20, 2021 USD ($) a ft² | Sep. 30, 2022 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($)
Other Commitments [Line Items] |  |  |  |
Contingent liabilities |  | $ 0 |  |
Tax increment financing award | $ 16,000,000 |  |  |
State income tax credits | 2,500,000 |  |  |
Technology License Commitments | ARO-ENaC and ARO-HIF2 Candidates |  |  |  |
Other Commitments [Line Items] |  |  |  |
Milestone payments |  | $ 0 | $ 2,400,000 | $ 0
Facilities | Minimum |  |  |  |
Other Commitments [Line Items] |  |  |  |
Amount intends to invest for buildout of facilities | 200,000,000 |  |  |
Facilities | Maximum |  |  |  |
Other Commitments [Line Items] |  |  |  |
Amount intends to invest for buildout of facilities | $ 260,000,000 |  |  |
Wisconsin | Verona Technology Park |  |  |  |
Other Commitments [Line Items] |  |  |  |
Land purchased (in acres) | a | 13 |  |  |
Wisconsin | Drug Manufacturing Facility |  |  |  |
Other Commitments [Line Items] |  |  |  |
Planned area of site (in sq ft) | ft² | 160 |  |  |
Wisconsin | Laboratory And Office Facility |  |  |  |
Other Commitments [Line Items] |  |  |  |
Planned area of site (in sq ft) | ft² | 140 |  |  |

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