Collaboration and Licensing Agreements - Revenue by Licenses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Collaboration research and licensing agreements
Total	$ 125,576	$ 110,493	$ 174,615
Alexion
Collaboration research and licensing agreements
Total	70,070	58,213	64,891
Amgen
Collaboration research and licensing agreements
Total	0	30,000	0
Gilead
Collaboration research and licensing agreements
Total	0	0	6,000
Janssen
Collaboration research and licensing agreements
Total	0	0	77,820
Incyte
Collaboration research and licensing agreements
Total	51,696	8,693	8,700
Mabgeek
Collaboration research and licensing agreements
Total	1,800	1,500	0
Novartis
Collaboration research and licensing agreements
Total	0	4,000	0
Omeros
Collaboration research and licensing agreements
Total	0	0	5,000
Vega
Collaboration research and licensing agreements
Total	0	500	0
Vir Bio
Collaboration research and licensing agreements
Total	2,010	587	2,204
Zenas BioPharma, Inc.
Collaboration research and licensing agreements
Total		0	10,000
Third Party Licensee
Collaboration research and licensing agreements
Total	$ 0	$ 7,000	$ 0

Xencor Inc 10-K