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Leases - Additional Information (Detail) |  | 1 Months Ended | 2 Months Ended | 3 Months Ended | 17 Months Ended
--- | --- | --- | --- | --- | ---
Oct. 23, 2020 USD ($) ft² | Mar. 31, 2020 USD ($) ft² | Apr. 30, 2019 USD ($) ft² Option | Jan. 31, 2016 ft² | Dec. 31, 2020 USD ($) ft² Option | Dec. 31, 2020 USD ($) Option | Dec. 31, 2019 USD ($) | May 31, 2020 USD ($) ft²
Lessee Lease Description [Line Items] |  |  |  |  |  |  |  |
Estimated lease payments |  |  |  |  | $ 31,596,000 | $ 31,596,000 |  |
Operating lease cost |  |  |  |  |  | 900,000 | $ 500,000 |
Variable lease cost |  |  |  |  |  | 200,000 | 200,000 |
Short-term lease cost |  |  |  |  |  | 0 | 0 |
Operating lease cash payments |  |  |  |  |  | $ 700,000 | $ 300,000 |
Weighted-average remaining lease term |  |  |  |  | 9 years 2 months 12 days | 9 years 2 months 12 days |  |
Weighted-average discount rate |  |  |  |  | 8.40% | 8.40% |  |
California | Halozyme, Inc. | Sublease Agreement |  |  |  |  |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |  |  |  |  |
Office space leases, in square feet | ft² |  | 21,000 |  |  |  |  |  |
Lease expiration date |  | Jan. 14, 2023 |  |  |  |  |  |
Estimated lease payments |  | $ 2,000,000.0 |  |  |  |  |  |
Sublease commencement date |  | Apr. 01, 2020 |  |  |  |  |  |
Corporate Headquarters In Pasadena | California |  |  |  |  |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |  |  |  |  |
Office space leases, in square feet | ft² | 24,000 |  |  |  |  |  |  |
Lease commencement period | 2021-07 |  |  |  |  |  |  |
Lease expiration month and year | 2027-04 |  |  |  |  |  |  |
Estimated lease payments | $ 6,900,000 |  |  |  |  |  |  |
Expected leasehold improvements, net of tenant improvement allowances | $ 4,000,000.0 |  |  |  |  |  |  |
Corporate Headquarters In Pasadena | California | Colorado Owner, LLC |  |  |  |  |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |  |  |  |  |
Lease term |  |  | 91 months |  |  |  |  |
Office space leases, in square feet | ft² |  |  | 24,000 |  |  |  |  |
Lease payments, commencement date |  |  | Sep. 30, 2019 |  |  |  |  |
Estimated lease payments |  |  | $ 8,700,000 |  |  |  |  |
Lease expiration date |  |  | Apr. 30, 2027 |  |  |  |  |
Payments for leasehold improvements, net of tenant improvement allowances |  |  | $ 3,500,000 |  |  |  |  |
Operating lease renewal term |  |  | 5 years |  |  |  |  |
Number of options to renew | Option |  |  | 1 |  |  |  |  |
Research Facility in Madison | Wisconsin |  |  |  |  |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |  |  |  |  |
Office space leases, in square feet | ft² |  |  |  | 60,000 |  |  |  |
Lease expiration date |  |  |  | Sep. 30, 2026 |  |  |  | Sep. 30, 2031
Operating lease renewal term |  |  |  |  | 5 years | 5 years |  |
Number of options to renew | Option |  |  |  |  | 2 | 2 |  |
Estimated lease payments |  |  |  |  | $ 1,200,000 | $ 1,200,000 |  | $ 26,200,000
Expected leasehold improvements, net of tenant improvement allowances |  |  |  |  |  |  |  | $ 11,000,000.0
Additional office space for lease | ft² |  |  |  |  | 10,743 |  |  | 40,000

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