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Equity-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2026
Share-Based Payment Arrangement [Abstract] |
Schedule of Equity-based Compensation Expense Categories In Consolidated Statements of Operations and Comprehensive Income (Loss) | Cullinan recorded equity-based compensation in the following expense categories in the consolidated statements of operations and comprehensive income (loss) for the three and six months ended June 30, 2026 and 2025 (in thousands):
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2026 |  |  | 2025 |  |  | 2026 |  |  | 2025 |
General and administrative |  | $ | 4,142 |  |  | $ | 5,721 |  |  | $ | 7,799 |  |  | $ | 11,166 |
Research and development |  |  | 4,305 |  |  |  | 4,166 |  |  |  | 8,264 |  |  |  | 8,095 |
Total equity-based compensation |  | $ | 8,447 |  |  | $ | 9,887 |  |  | $ | 16,063 |  |  | $ | 19,261 |

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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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