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Commitments and Contingencies - Additional Information (Detail) | 9 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2018 USD ($) ft² | Aug. 10, 2018 ft² | Dec. 08, 2016 USD ($) | May 20, 2016 USD ($)
Commitments And Contingencies Disclosure [Line Items] |  |  |  |
Operating lease expiration date | 2018-02 |  |  |
South San Francisco, California | New Office Lease Agreement |  |  |  |
Commitments And Contingencies Disclosure [Line Items] |  |  |  |
Leased area | ft² | 8,606 |  |  |
Operating lease term of contract | 5 years 2 months |  |  |
Operating lease commencement date | Feb. 16, 2018 |  |  |
South San Francisco, California | Office Lease Agreement |  |  |  |
Commitments And Contingencies Disclosure [Line Items] |  |  |  |
Leased area | ft² |  | 4,626 |  |
Pfizer Inc | Collaboration Agreement |  |  |  |
Commitments And Contingencies Disclosure [Line Items] |  |  |  |
Milestone payment | $ 1,000,000 |  |  |
Pfizer Inc | Collaboration Agreement | Maximum |  |  |  |
Commitments And Contingencies Disclosure [Line Items] |  |  |  |
Contingent cash payments upon achievement of clinical, regulatory and commercial milestones |  |  | $ 17,500,000 |
AGC Biologics, Inc | MarzAA |  |  |  |
Commitments And Contingencies Disclosure [Line Items] |  |  |  |
Contractual obligation payments | 300,000 |  |  | $ 3,800,000
Accrued liabilities | 300,000 |  |  |
AGC Biologics, Inc | Dalcinonacog alfa (“DalcA”) |  |  |  |
Commitments And Contingencies Disclosure [Line Items] |  |  |  |
Contractual obligation payments | $ 3,900,000 |  |  | $ 5,600,000

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