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Leases | 12 Months Ended
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Dec. 31, 2022
Leases [Abstract] |
Leases | 11. Leases Operating Lease In December 2015, the Company entered into a lease (the “2016 Lease”) of office and laboratory space located in South San Francisco, California for the Company’s corporate headquarters. The 2016 Lease has an initial term of ten years through 2026 and the Company has an option to extend the initial term for an additional five years at the then fair rental value as determined pursuant to the 2016 Lease. In addition, the Company obtained a standby letter of credit (the “Letter of Credit”) in an amount of approximately $0.9 million, which may be drawn by the Landlord to be applied for certain purposes upon the Company’s breach of any provisions under the 2016 Lease. The Company recorded the $0.9 million of cash securing the Letter of Credit as non-current restricted cash on its balance sheet as of December 31, 2022 and 2021. Rent expense during the years ended December 31, 2022 and 2021 was $5.1 million and $5.1 million, respectively. Supplemental information related to leases are as follows:
|  | Year Ended |
|  | December 31, 2022 |  |  | December 31, 2021 |
|  | (in thousands) |
Cash paid for amounts included in the measurement of lease liabilities |  |  |  |  |  |
Operating cash flows from operating leases |  | $ | 5,273 |  |  | $ | 5,129 |
|  | December 31, 2022 |  |  | December 31, 2021 |
|  | (in thousands) |
Supplemental balance sheet information related to leases: |  |  |  |  |  |
Operating lease right-of-use assets |  | $ | 15,949 |  |  | $ | 19,362 |
Current operating lease liabilities |  |  | 4,082 |  |  |  | 3,618 |
Non-current operating lease liabilities |  |  | 13,975 |  |  |  | 18,056 |
Total operating lease liabilities |  | $ | 18,057 |  |  | $ | 21,674 |
Weighted-average remaining lease term (in years) |  |  |  |  |  |
Operating lease |  | 3.75 |  |  | 4.75 |
Weighted-average discount rate |  |  |  |  |  |
Operating lease |  |  | 8.25 | % |  |  | 8.25 | %
|  |  |  | December 31, 2022 |
|  |  |  | (in thousands) |
Maturity of operating lease liabilities |  |  |  |  |
2023 |  |  |  |  | 5,420 |
2024 |  |  |  |  | 5,572 |
2025 |  |  |  |  | 5,729 |
2026 |  |  |  |  | 4,388 |
Total lease payments |  |  |  |  | 21,109 |
Less imputed interest |  |  |  |  | (3,052 | )
Present value of lease liabilities |  |  |  | $ | 18,057 |

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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 https://asc.fasb.org/subtopic&trid=77888251 + Details
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