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Leases - Disclosure (Detail) $ in Millions | Sep. 30, 2020 USD ($) ft² renewalOption | Dec. 31, 2019 USD ($)
--- | --- | ---
Lessee, Lease, Description [Line Items] |  |
Restricted cash | $ | $ 3.2 | $ 3.2
Letter of Credit |  |
Lessee, Lease, Description [Line Items] |  |
Restricted cash | $ | $ 3.2 |
12780/12790 El Camino Real Master Lease [Member] |  |
Lessee, Lease, Description [Line Items] |  |
Number of renewal options | renewalOption | 2 |
Renewal term | 10 years |
12780 El Camino Real |  |
Lessee, Lease, Description [Line Items] |  |
Square feet | 141,000 |
12790 El Camino Real, Suite 130 |  |
Lessee, Lease, Description [Line Items] |  |
Square feet | 2,000 |
12790 El Camino Real, Suite 150 |  |
Lessee, Lease, Description [Line Items] |  |
Square feet | 8,000 |
12790 El Camino Real, Suite 300 |  |
Lessee, Lease, Description [Line Items] |  |
Square feet | 28,000 |
12777 High Bluff Drive |  |
Lessee, Lease, Description [Line Items] |  |
Square feet | 45,000 |
12790 El Camino Real, Suite 200 |  |
Lessee, Lease, Description [Line Items] |  |
Square feet | 28,000 |
12790 El Camino Real, Suite 100 |  |
Lessee, Lease, Description [Line Items] |  |
Square feet | 17,000 |

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- Definition Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918673-209980 + Details
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