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Leases - Additional Information (Detail) $ in Millions | 1 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Dec. 31, 2018 ft² space | May 31, 2018 ft² | Aug. 31, 2017 ft² extension_period | Jun. 30, 2019 USD ($) ft² | Jun. 30, 2018 ft²
Lessee, Lease, Description [Line Items] |  |  |  |  |
Cash paid for amounts included in the measurement of lease liabilities | $ |  |  |  | $ 3.1 |
Operating lease liability, weighted-average remaining lease term |  |  |  | 10 years 7 months 6 days |
Operating lease liability, weighted-average discount rate, percent |  |  |  | 6.50% |
ARE-San Francisco No. 19, LLC | Mission Bay Lease |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Lease space (in sq. feet) |  |  | 137,046 | 2,690 |
Number of consecutive 5 year terms to extend lease | extension_period |  |  | 2 |  |
Lease extension term |  |  | 5 years |  |
Additional space required to be leased in the future (in sqft) |  |  | 15,000 |  |
Recognized a right-of-use asset and lease liability | $ |  |  |  | $ 1.3 |
Kilroy Realty Finance Partnership, L.P | Third Street Lease |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Lease space (in sq. feet) | 67,105 | 135,936 |  |  | 1,726
Lease extension term |  | 5 years |  |  |
Lease term start month and year |  | 2018-06 |  |  |
Number of additional spaces delivered | space | 2 |  |  |  |

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