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Leases - Schedule of Description of Operating Lease (Detail) - Office/Laboratory [Member] | 3 Months Ended
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Mar. 31, 2020 ft²
12780 El Camino Real |  |
Leases [Line Items] |  |
Square Feet | 141,000 | [1]
Commencement Date | Aug. 07, 2019 | [1]
Expiration Date | Jul. 31, 2031 | [1]
12790 El Camino Real, Suite 130 |  |
Leases [Line Items] |  |
Square Feet | 2,000 | [1]
Commencement Date | Dec. 01, 2019 | [1]
Expiration Date | Jul. 31, 2031 | [1]
12790 El Camino Real, Suite 150 |  |
Leases [Line Items] |  |
Square Feet | 8,000 | [1]
Commencement Date | Aug. 07, 2019 | [1]
Expiration Date | Jul. 31, 2031 | [1]
12790 El Camino Real, Suite 300 |  |
Leases [Line Items] |  |
Square Feet | 28,000 | [1]
Commencement Date | Dec. 01, 2019 | [1]
Expiration Date | Jul. 31, 2031 | [1]
12777 High Bluff Drive |  |
Leases [Line Items] |  |
Square Feet | 45,000 | [2]
Commencement Date | Jul. 01, 2018 | [2]
Expiration Date | Jul. 31, 2029 | [2]
12790 El Camino Real, Suite 200 |  |
Leases [Line Items] |  |
Square Feet | 28,000 | [1]
Commencement Date | Feb. 01, 2021 | [1]
Expiration Date | Jul. 31, 2031 | [1]
12790 El Camino Real, Suite 100 |  |
Leases [Line Items] |  |
Square Feet | 17,000 | [1]
Commencement Date | Feb. 01, 2021 | [1]
Expiration Date | Jul. 31, 2031 | [1]
[1] | Under the terms of the lease, we have two options to extend the term of the lease for a period of ten years each. We were not reasonably certain to exercise either of these options at lease commencement. As such, neither option was recognized as part of the associated operating lease right-of-use asset or liability. In connection with the lease, in lieu of a cash security deposit, Wells Fargo Bank, N.A., or Well Fargo, issued a $3.0 million letter of credit on our behalf, which is secured by a deposit of equal amount.
[2] | Under the terms of the lease, we do not have the option to extend the lease. In lieu of a cash security deposit, Wells Fargo issued a $1.0 million letter of credit on our behalf, which is secured by a deposit of $0.2 million

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