Collaborative, Licensing and Other Arrangements - Schedule of Funding Expenses (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Research and Development Arrangement, Contract to Perform for Others
Research and development expense	$ 660,784	$ 523,662	$ 1,814,288	$ 1,530,445
Amgen, Inc
Research and Development Arrangement, Contract to Perform for Others
BeOne’s portion of the development funding	12,204	59,325	130,070	152,040
Less: Amortization of research and development cost share liability	6,182	29,275	64,345	74,844
Research and development expense	$ 6,022	$ 30,050	$ 65,725	$ 77,196

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.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 985
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-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
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Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 220
-SubTopic 40
-Name Accounting Standards Codification
-Section 55
-Paragraph 18
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476153/220-40-55-18

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Topic 220
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-Name Accounting Standards Codification
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Reference 4: http://www.xbrl.org/2003/role/exampleRef
-Topic 280
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-Name Accounting Standards Codification
-Section 55
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 730
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Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 912
-SubTopic 730
-Name Accounting Standards Codification
-Section 25
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479532/912-730-25-1

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