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License and Collaboration Agreements (Tables) | 6 Months Ended
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Jun. 30, 2026
License And Collaboration Agreements [Abstract] |
Summary of Research and Development Costs Related to Collaboration and License Agreements | The following table summarizes each party’s respective share of costs incurred and paid by the other party for zipalertinib development activities 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 |
Cullinan's share of zipalertinib research and development costs incurred by Taiho |  | $ | 6,618 |  |  | $ | 7,772 |  |  | $ | 12,428 |  |  | $ | 13,390 |
Cullinan’s share of general and administrative costs incurred by Taiho |  | $ | 1,005 |  |  | $ | 592 |  |  | $ | 1,671 |  |  | $ | 1,064 |
Taiho’s share of research and development costs incurred by Cullinan |  | $ | 652 |  |  | $ | 3,112 |  |  | $ | 1,474 |  |  | $ | 4,486 |

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- Definition License and collaboration agreements. + References No definition available. + Details
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- Definition Tabular disclosure of collaborative arrangement and arrangement other than collaborative applicable to revenue-generating activity or operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 808 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479402/808-10-50-1 + Details
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