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Leases | 12 Months Ended
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Dec. 31, 2023
Leases [Abstract] |
Leases | 10. Leases Prior to the Company’s restructuring, as described in Note 17, the Company leased certain office space, laboratory facilities, and equipment. These leases required monthly lease payments that were subject to annual increases throughout the lease term. Certain of these leases also included renewal options at the election of the Company to renew or extend the lease for an additional three to five years. These optional periods were not considered in the determination of the right-of-use assets or lease liabilities associated with these leases as the Company did not consider it reasonably certain it would exercise the options. The Company performed evaluations of its contracts and determined it has both operating and finance leases. Variable lease expense for these leases primarily consisted of common area maintenance and other operating costs. In April 2019, the Company entered into a lease agreement (the “Las Cimas Lease”) for its corporate headquarters and laboratory space located in Austin, Texas. The Las Cimas Lease included approximately 30,000 square feet and commenced on April 30, 2019, with an expiration on April 30, 2028. The Company posted a customary letter of credit in the amount of $1.5 million as security, which is subject to automatic reductions per the terms of the Las Cimas Lease. A tenant allowance of up to $1.0 million was provided by the lessor and fully reimbursed to the Company. In August 2023, the Company terminated its building lease in Austin, Texas. The negotiated termination agreement obligated the Company to pay the lessor a $2.0 million termination fee in exchange for releasing the Company of all further obligations under the lease including terminating the associated letter of credit. The following table summarizes the Company’s recognition of its operating and finance leases (in thousands):
|  |  |  | December 31, |
|  | Classification |  | 2023 |  |  | 2022 |
Assets |  |  |  |  |  |  |  |  |  |
Operating |  | Operating lease right-of-use assets |  | $ | — |  |  | $ | 3,430 |
Finance |  | Other non-current assets |  |  | — |  |  |  | 597 |
Total leased assets |  |  | — |  |  |  | 4,027 |
Leases |  |  |  |  |  |  |  |  |  |
Current |  |  |  |  |  |  |  |  |  |
Operating |  | Operating lease liabilities |  |  | — |  |  |  | 625 |
Finance |  | Accrued and other current liabilities |  |  | — |  |  |  | 16 |
Non-current |  |  |  |  |  |  |  |  |  |
Operating |  | Non-current operating lease liabilities |  |  | — |  |  |  | 4,004 |
Total lease liabilities |  | $ | — |  |  | $ | 4,645 |
The following table summarizes the weighted-average remaining lease term and discount rates for the Company’s operating and finance leases:
|  | December 31, |
|  | 2023 |  |  | 2022 |
Lease term (years) |  |  |  |  |  |  |  |
Operating leases |  |  | 0.0 |  |  |  | 5.3 |
Finance leases |  |  | 0.0 |  |  |  | 0.6 |
Discount rate |  |  |  |  |  |  |  |
Operating leases |  |  | — | % |  |  | 10.6 | %
Finance leases |  |  | — | % |  |  | 10.2 | %
The following table summarizes the lease costs pertaining to the Company’s operating leases (in thousands):
|  | Year Ended December 31, |
|  | 2023 |  |  | 2022 |  |  | 2021 |
Operating lease cost |  | $ | 455 |  |  | $ | 910 |  |  | $ | 991 |
Variable lease cost |  |  | 471 |  |  |  | 472 |  |  |  | 519 |
Total lease cost |  | $ | 926 |  |  | $ | 1,382 |  |  | $ | 1,510 |
Cash paid for amounts included in the measurement of operating lease liabilities during the years ended December 31, 2023 and 2022 was $0.5 million and $0.9 million, respectively, and was included within net cash used in operating activities in the cash flows. As of December 31, 2023, the Company had no operating or finance lease obligations.

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- Definition The entire disclosure for finance leases of lessee. Includes, but is not limited to, description of lessee's finance lease and maturity analysis of finance 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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