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Leases | 6 Months Ended
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Jun. 30, 2026
Leases [Abstract] |
Leases | (9) Leases Cullinan has an operating lease for approximately 14,000 square feet of office space in a multi-tenant building in Cambridge, Massachusetts, which commenced in August 2022 and expires in September 2028. Lease expense consisted of operating lease costs of $0.3 million in each of the three months ended June 30, 2026 and 2025. Lease expense consisted of operating lease costs of $0.6 million in each of the six months ended June 30, 2026 and 2025. The following table summarizes supplemental cash flow information for the six months ended June 30, 2026 and 2025 (in thousands):
|  | Six Months Ended June 30, |
|  | 2026 |  |  | 2025 |
Cash paid for amounts included in measurement of lease liabilities: |  |  |  |  |  |
Operating cash flows from operating leases |  | $ | 747 |  |  | $ | 729 |
The following table summarizes the Company’s future minimum lease payments as of June 30, 2026 (in thousands):
|  | June 30, 2026 |
Remainder of 2026 |  | $ | 282 |
2027 |  |  | 1,190 |
2028 |  |  | 906 |
Total future minimum lease payments |  |  | 2,378 |
Less: imputed interest |  |  | (307 | )
Total lease liabilities at present value |  | $ | 2,071 |
The following table summarizes the weighted-average remaining lease term and discount rate as of June 30, 2026 and December 31, 2025:
|  | June 30, 2026 |  |  | December 31, 2025 |
Weighted-average remaining lease term (in years) |  |  | 2.3 |  |  |  | 2.8 |
Weighted-average discount rate |  |  | 11.8 | % |  |  | 11.8 | %

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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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