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Collaboration Agreements, License Agreement and Revenues - Summary of License Revenue and Development Revenue Recognized under Agreement (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Disaggregation of Revenue [Line Items]
Total revenue	$ 46,333	$ 40,134	$ 152,877	$ 120,614
License Revenue [Member]
Disaggregation of Revenue [Line Items]
Total revenue	0	2,649	0	9,649
Development Revenue [Member]
Disaggregation of Revenue [Line Items]
Total revenue	385	6,775	1,532	15,825
Astellas Agreement [Member] | License Revenue [Member] | Europe [Member]
Disaggregation of Revenue [Line Items]
Total revenue	382	2,322	987	5,657
AstraZeneca Agreements [Member] | License Revenue [Member] | U.S./RoW and China [Member]
Disaggregation of Revenue [Line Items]
Total revenue	0	2,649	0	2,649
AstraZeneca Agreements [Member] | Development Revenue [Member] | U.S./RoW and China [Member]
Disaggregation of Revenue [Line Items]
Total revenue	$ 0	$ 3,676	$ 418	$ 7,981

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