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Leases | 3 Months Ended
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Mar. 31, 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 | March 31, 2023 |  | December 31, 2022
Right-of-use assets | $ | 7,972 |  | $ | 9,295
Current portion of lease liabilities | 3,998 |  | 3,894
Operating lease liability, net of current portion | 4,814 |  | 5,855
Total | $ | 8,812 |  | $ | 9,749
Weighted-average remaining life (years) | 2.2 |  | 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 March 31, |  |
| 2023 |  | 2022 |  |  |  |
Operating lease expense | $ | 1,064 |  |  | $ | 1,064 |  |  |  |  |
Cash paid for operating lease | $ | 1,098 |  |  | $ | 1,058 |  |  |  |  |
The following table summarizes our undiscounted cash payment obligations for our operating lease liabilities as of March 31, 2023 (in thousands):
Remainder of 2023 | $ | 3,343 |
2024 | 4,589 |
2025 | 1,321 |
2026 | 252 |
Thereafter | — |
Total undiscounted operating lease payments | 9,505 |
Imputed interest expenses | (693) |
Total operating lease liabilities | 8,812 |
Less: Current portion of operating lease liability | (3,998) |
Operating lease liability, net of current portion | $ | 4,814 |
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 have recognized no income from the sub-lease as of March 31, 2023.

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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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