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Segment Information - Research and development costs and an allocation of indirect research and development costs to each program (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2025 USD ($) segment	Jun. 30, 2024 USD ($)
Segment Information
Number of operating segments | segment			1
Number of reportable segments | segment			1
Research and Development Expense	$ 54,196	$ 39,687	$ 106,810	$ 71,348
Single reportable segment
Segment Information
Research and Development Expense	54,196	39,687	106,810	71,348
Single reportable segment | Barzolvolimab/Anti-KIT Program
Segment Information
Research and Development Expense	42,645	30,472	82,348	54,250
Single reportable segment | CDX-622
Segment Information
Research and Development Expense	3,838	3,126	9,289	6,547
Single reportable segment | Other Programs
Segment Information
Research and Development Expense	$ 7,713	$ 6,089	$ 15,173	$ 10,551

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- Definition

Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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Amount of expense for research and development. Includes, but is not limited to, cost for computer software product to be sold, leased, or otherwise marketed and writeoff of research and development assets acquired in transaction other than business combination or joint venture formation or both. Excludes write-down of intangible asset acquired in business combination or from joint venture formation or both, used in research and development activity.

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