v3.26.1

Commitments, Contingencies, and Collaborations - Allist (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		12 Months Ended
	Jun. 30, 2021	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Agreement
Research and development		$ 37,617	$ 61,289
Global Technology Transfer And License Agreement \| Allist
Agreement
Cash payment	$ 40,000
Maximum amount payable upon achievement of certain clinical and regulatory milestone events		105,000
Maximum amount payable upon achievement of commercial milestones		655,000
Global Technology Transfer And License Agreement \| Allist \| Common stock
Agreement
Shares issued in execution of agreement (in shares)	1,276,250
Clinical Collaboration Agreement \| Allist
Agreement
Research and development		700	500
Cost reimbursement		$ 300	$ 400
Milestone payments paid				$ 5,000

Amount of cost reimbursement received recorded as a reduction of research and development expenses.

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Maximum amount payable upon achievement of certain clinical and regulatory milestone events.

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Maximum amount payable upon achievement of commercial milestones.

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Amount of cash outflow for cash payment made in relation to the agreement.

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Number of shares issued in lieu of cash in execution of agreement.

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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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ArriVent BioPharma, Inc. 10-Q