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Subsequent Events - Additional Information (Detail) $ in Thousands | Nov. 22, 2021 USD ($) | Nov. 19, 2021 USD ($) ft² Option | Sep. 30, 2021 USD ($)
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Subsequent Event [Line Items] |  |  |
Estimated lease payments |  |  | $ 37,114
Subsequent Event | GSK | Collaboration and License agreements |  |  |
Subsequent Event [Line Items] |  |  |
Milestone payment | $ 120,000 |  |
Milestone payment receivable at start of phase two | 30,000 |  |
Milestone payment receivable upon achievement of phase two and first patient dosed in phase three | $ 100,000 |  |
Tiered royalties on net product sales receive description | Arrowhead is further eligible to receive tiered royalties on net product sales in a range of mid-teens to twenty percent. |  |
Subsequent Event | Maximum | GSK | Collaboration and License agreements |  |  |
Subsequent Event [Line Items] |  |  |
Commercial milestone payments at first commercial sale | $ 190,000 |  |
Sales-related milestone payments | $ 590,000 |  |
Research Facility in San Diego | California | Subsequent Event |  |  |
Subsequent Event [Line Items] |  |  |
Lease term |  | 15 years |
Office space leases, in square feet | ft² |  | 144,000 |
Lease commencement date |  | 2023-05 |
Estimated lease payments |  | $ 119,000 |
Estimated payments for operating expenses |  | 3,000 |
Payments for leasehold improvements, net of tenant improvement allowances |  | $ 31,000 |
Operating lease, description |  | Pursuant to the lease, within twelve months of the expiration of the initial 15-year term, the Company has the option to extend the lease for up to one additional ten-year term, with certain annual increases in base rent |
Operating lease renewal term |  | 10 years |
Research Facility in San Diego | California | Subsequent Event | Maximum |  |  |
Subsequent Event [Line Items] |  |  |
Number of options to renew | Option |  | 1 |

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- Definition Sales-related milestone payments. + References No definition available. + Details
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