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Operating Leases | 12 Months Ended
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Dec. 31, 2021
Leases [Abstract] |
Operating Leases | Operating Leases Our leases consist of a Lease Agreement (the Mission Bay Lease) with ARE-San Francisco No. 19, LLC (ARE) for our 155,215 square foot corporate office and R&D facility located at 455 Mission Bay Boulevard, San Francisco, California (the Mission Bay Facility) and a Lease Agreement (the Third Street Lease) with Kilroy Realty Finance Partnership, L.P. (Kilroy) for an additional 135,936 square foot facility to support our R&D operations at 360 Third Street, San Francisco, California (the Third Street Facility). The following table presents key information regarding these leases (dollars in thousands):
| Mission Bay Facility |  | Third Street Facility
Lease commencement | September 2017 |  | June 2018
Lease term | January 2030 |  | January 2030
Space delivered during the year ended December 31, 2020 |  |  |
Square footage | 4,940 |  |  | — |
Right-of-use asset and lease liability recognized | $ | 2,133 |  |  | $ | — |
Space delivered during the year ended December 31, 2021 |  |  |
Square footage | 2,012 |  |  | — |
Right-of-use asset and lease liability recognized | $ | 1,057 |  |  | $ | — |
Renewal terms | Two consecutive five-year terms |  | One five-year term
•The monthly base rent for both facilities will escalate over the term of the lease at various intervals. •Both leases include various covenants, indemnities, defaults, termination rights, security deposits and other provisions customary for lease transactions of this nature. •During the term of the Mission Bay Lease, we are responsible for paying our share of operating expenses specified in the lease, including utilities, common area maintenance, insurance costs and taxes. •For the Third Street Lease, our fixed annual base rent on an industrial gross lease basis includes certain expenses and property taxes paid directly by the landlord. We have a one-time right of first offer with respect to certain additional rental space at the Third Street Facility. We recognize rent expense for these operating leases on a straight-line basis over the lease period. The components of lease expense, which we include in operating expenses in our Consolidated Statements of Operations, were as follows (in thousands):
| Year Ended December 31,
| 2021 |  | 2020 |  | 2019
Operating lease expense | $ | 19,153 |  |  | $ | 18,985 |  |  | $ | 14,697 |
Variable lease expense | 8,974 |  |  | 8,179 |  |  | 6,408 |
Total lease expense | $ | 28,127 |  |  | $ | 27,164 |  |  | $ | 21,105 |
During the years ended December 31, 2021, 2020 and 2019, we paid $16.8 million, $16.2 million and $8.4 million, respectively, of operating lease payments related to our lease liabilities, which we include in net cash used in operating activities in our Consolidated Statements of Cash Flows. As of December 31, 2021, the maturities of our operating lease liabilities were as follows (in thousands):
Year ending December 31, |
2022 | $ | 18,626 |
2023 | 20,909 |
2024 | 21,572 |
2025 | 22,255 |
2026 | 22,957 |
2027 and thereafter | 75,411 |
Total lease payments | 181,730 |
Less: portion representing interest | (37,900) |
Less: lease incentives | (653) |
Operating lease liabilities | 143,177 |
Less: current portion | (17,441) |
Operating lease liabilities, less current portion | $ | 125,736 |
As of December 31, 2021, the weighted-average remaining lease term is 8.1 years and the weighted-average discount rate used to determine the operating lease liability was 5.8%.

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- Definition The entire disclosure for operating leases of lessee. Includes, but is not limited to, description of operating lease and maturity analysis of operating lease liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -URI http://asc.fasb.org/subtopic&trid=77888251 + Details
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