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Leases | 9 Months Ended
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Sep. 30, 2020
Leases [Abstract] |
Leases | Leases Operating leases consisted of the following:
Address |  | Type |  | Square Feet |  | Commencement Date |  | Expiration Date
12780 El Camino Real (1) |  | Office/Laboratory |  | 141,000 |  |  | August 7, 2019 |  | July 31, 2031
12790 El Camino Real, Suite 130 (1) |  | Office |  | 2,000 |  |  | December 1, 2019 |  | July 31, 2031
12790 El Camino Real, Suite 150 (1) |  | Office |  | 8,000 |  |  | August 7, 2019 |  | July 31, 2031
12790 El Camino Real, Suite 300 (1) |  | Office |  | 28,000 |  |  | December 1, 2019 |  | July 31, 2031
12777 High Bluff Drive |  | Office |  | 45,000 |  |  | July 1, 2018 |  | July 31, 2029
12790 El Camino Real, Suite 200 (1) |  | Office |  | 28,000 |  |  | February 1, 2021 |  | July 31, 2031
12790 El Camino Real, Suite 100 (1) |  | Office |  | 17,000 |  |  | February 1, 2021 |  | July 31, 2031
______________ (1) Under the terms of the 12780/12790 El Camino Real master 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. Note: In connection with our operating leases, in lieu of cash security deposits, Wells Fargo Bank, N.A., issued letters of credit on our behalf, which are secured by deposits totaling $3.2 million. Our operating lease cost was $7.4 million and $5.9 million for the nine months ended September 30, 2020 and 2019, respectively. Cash paid for amounts in the measurement of lease liabilities for operating cash flows from operating leases was $6.4 million and $5.5 million for the nine months ended September 30, 2020 and 2019, respectively. Our operating leases had a weighted average remaining lease term of approximately 10.5 years and 11.2 years at September 30, 2020 and December 31, 2019, respectively, and a weighted average discount rate of 5.8% at September 30, 2020 and December 31, 2019, respectively. Approximate future minimum lease payments under operating leases were as follows:
(in millions) | September 30, 2020
Year ending December 31, 2020 (3 months remaining) | $ | 2.1 |
Year ending December 31, 2021 | 10.6 |
Year ending December 31, 2022 | 10.9 |
Year ending December 31, 2023 | 11.2 |
Year ending December 31, 2024 | 11.6 |
Thereafter | 79.7 |
Total operating lease payments | 126.1 |
Less accreted interest | 33.4 |
Total operating lease liabilities | 92.7 |
Less current operating lease liabilities | 9.7 |
Noncurrent operating lease liabilities | $ | 83.0 |
______________ Note: Amounts presented in the table above exclude $28.3 million of non-cancelable future minimum lease payments for operating leases that have not yet commenced.

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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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