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LEASES | 6 Months Ended
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Jun. 30, 2024
LEASES |
LEASES | 11.Leases We have a sublease agreement with Atara Biotherapeutics, Inc. (Atara) entered in October 2022 to sublease an office space located in South San Francisco, California. Subject to the terms of the sublease agreement, the lease term commenced in November 2022 and shall expire in May 2025. This leased facility is currently held as our new Headquarters following the expiration of our previously leased facility in January 2023. The weighted average remaining term of our leases as of June 30, 2024 was 0.92 years. We previously leased our prior headquarter space located in South San Francisco, California with Healthpeak Properties, Inc. (formerly known as HCP BTC, LLC), and had a sublease agreement with an unrelated third-party to sublet a portion of the leased facility. Both leases expired in January 2023. The components of our operating lease expense were as follows (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended June 30, | ​ | Six Months Ended June 30,
​ | ​ | 2024 | ​ | 2023 | ​ | 2024 | ​ | 2023
Fixed operating lease expense |  | $ | 166 |  | $ | 166 | ​ | $ | 332 | ​ | ​ | 778
Variable operating lease expense (net credit) | ​ | ​ | 28 | ​ | ​ | (42) | ​ | ​ | 56 | ​ | ​ | 30
Total operating lease expense |  | $ | 194 |  | $ | 124 | ​ | $ | 388 |  | $ | 808
​ Supplemental information related to our operating lease were as follow (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended June 30, | ​ | Six Months Ended June 30,
​ | ​ | 2024 | ​ | 2023 | ​ | 2024 | ​ | 2023
Cash payments included in the measurement of operating lease liabilities | ​ | $ | 184 | ​ | $ | 178 | ​ | $ | 368 | ​ | ​ | 1,174
​ Supplemental information related to our operating sublease was as follow (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended June 30, | ​ | Six Months Ended June 30,
​ | ​ | 2024 | ​ | 2023 | ​ | 2024 | ​ | 2023
Fixed sublease expense |  | $ | — |  | $ | — | ​ | $ | — | ​ | ​ | 365
Variable sublease expense | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 77
Sublease income | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (442)
Net |  | $ | — |  | $ | — | ​ | $ | — |  | $ | —
​ The following table presents the future lease payments as of June 30, 2024 (in thousands): ​
​ | ​ | ​ | ​
Remainder of 2024 | ​ | $ | 371
2025 | ​ | ​ | 301
Total minimum payments required | ​ | $ | 672
​

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