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Subsequent Events - Additional Information (Detail) | Oct. 23, 2020 USD ($) ft² | Oct. 07, 2020 USD ($) | Sep. 30, 2019 USD ($)
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Subsequent Event [Line Items] |  |  |
Estimated lease payments |  |  | $ 22,385,552
Subsequent Event | Corporate Headquarters In Pasadena | California |  |  |
Subsequent Event [Line Items] |  |  |
Office space leases, in square feet | ft² | 24,434 |  |
Lease commencement period | 2021-07 |  |
Lease expiration month and year | 2027-04 |  |
Estimated lease payments | $ 7,300,000 |  |
Expected leasehold improvements, net of tenant improvement allowances | $ 4,000,000.0 |  |
Takeda License Agreement | License and Co-Funding Agreement | Subsequent Event |  |  |
Subsequent Event [Line Items] |  |  |
Agreement date |  | Oct. 07, 2020 |
Ratio of Profit Sharing Structure for United States Commercialization |  | 50/50 profit sharing |
Cash received as due under collaboration agreement |  | $ 300,000,000.0 |
Development regulatory and sales milestones payments |  | $ 740,000,000.0 |
Takeda License Agreement | Minimum | License and Co-Funding Agreement | Subsequent Event |  |  |
Subsequent Event [Line Items] |  |  |
Percentage of eligible to receive tiered royalties on net sales |  | 20.00% |
Takeda License Agreement | Maximum | License and Co-Funding Agreement | Subsequent Event |  |  |
Subsequent Event [Line Items] |  |  |
Percentage of eligible to receive tiered royalties on net sales |  | 25.00% |
Development regulatory and sales milestones payments |  | $ 740,000,000.0 |

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- Definition Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121573735&loc=d3e41502-112717 Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=121580752&loc=d3e38371-112697 + Details
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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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