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Leases | 6 Months Ended
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Jun. 30, 2023
Leases [Abstract] |
Leases | LEASES All of our leases are operating leases and each contain customary rent escalation clauses. Certain of the leases have both lease and non-lease components. We have elected to account for each separate lease component and the non-lease components associated with that lease component as a single lease component for all classes of underlying assets. The following table provides additional details of our facility leases presented in our condensed balance sheets (dollars in thousands):
Facilities | June 30, 2023 |  | December 31, 2022
Right-of-use assets | $ | 7,053 |  | $ | 9,295
Current portion of lease liabilities | 4,105 |  | 3,894
Operating lease liability, net of current portion | 3,752 |  | 5,855
Total | $ | 7,857 |  | $ | 9,749
Weighted-average remaining life (years) | 2.0 |  | 2.4
Weighted-average discount rate | 6.8 | % |  | 6.8 | %
The lease costs, which are included in operating expenses in our condensed statements of operations and comprehensive loss, were as follows (in thousands):
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2023 |  | 2022 |  | 2023 |  | 2022
Operating lease expense | $ | 1,064 |  |  | $ | 1,064 |  |  | $ | 2,128 |  |  | $ | 2,128 |
Cash paid for operating lease | $ | 1,100 |  |  | $ | 1,064 |  |  | $ | 2,198 |  |  | $ | 2,122 |
The following table summarizes our undiscounted cash payment obligations for our operating lease liabilities as of June 30, 2023 (in thousands):
Remainder of 2023 | $ | 2,242 |
2024 | 4,589 |
2025 | 1,321 |
2026 | 252 |
Thereafter | — |
Total undiscounted operating lease payments | 8,404 |
Imputed interest expenses | (547) |
Total operating lease liabilities | 7,857 |
Less: Current portion of operating lease liability | (4,105) |
Operating lease liability, net of current portion | $ | 3,752 |
In March 2023, we entered into a sub-lease Agreement (the “Sub-lease”) with Chronus Health, Inc. ("Chronus). The Sub-lease permits use by Chronus of a portion of the space in our facility in Fremont, California. We lease the facility from a different counterparty under a separate head lease that commenced in September 2008 and has been amended multiple times to add space and to extend the lease term through March 2025. We have sub-leased to Chronus approximately 21,644 square feet of the 72,500 square foot building's interior space, plus corresponding exterior support space and parking. The term of the Sub-lease shall expire on February 1, 2025. In accordance with the Sub-lease we recognized an impairment of long-lived assets totaling $0.4 million during the three months ended March 31, 2023, which consisted primarily of impairment to the Fremont facility right-of-use asset. The Sub-lease commenced in April 2023 and we recognized $0.2 million and $0.3 million income from the Sub-lease during the three and six months ended June 30, 2023, respectively.

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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 -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//842-20/tableOfContent + Details
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