Collaboration and Licensing Agreements - Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Collaboration research and licensing agreements
Revenue recorded	$ 45,523	$ 30,175	$ 64,485	$ 115,670
Research collaboration
Collaboration research and licensing agreements
Revenue recorded	22,200	200	22,500	2,000
Milestone
Collaboration research and licensing agreements
Revenue recorded	10,000	0	15,000	5,000
Royalties
Collaboration research and licensing agreements
Revenue recorded	13,300	30,000	27,000	108,700
Alexion
Collaboration research and licensing agreements
Revenue recorded	11,200	6,700	21,600	12,900
Astellas
Collaboration research and licensing agreements
Revenue recorded	0	0	0	5,000
Janssen
Collaboration research and licensing agreements
Revenue recorded	22,200	200	27,500	2,000
MorphoSys
Collaboration research and licensing agreements
Revenue recorded	2,000	1,200	3,900	3,500
Vir
Collaboration research and licensing agreements
Revenue recorded	100	22,100	1,500	92,300
Zenas
Collaboration research and licensing agreements
Revenue recorded	$ 10,000	$ 0	$ 10,000	$ 0