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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		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Disaggregation of Revenue [Line Items]
Total revenue	$ 50,641	$ 44,319	$ 106,544	$ 80,480
License Revenue [Member]
Disaggregation of Revenue [Line Items]
Total revenue	0	1,000	0	7,000
Development Revenue [Member]
Disaggregation of Revenue [Line Items]
Total revenue	269	5,158	1,147	9,050
Astellas Agreement [Member] | License Revenue [Member] | Europe [Member]
Disaggregation of Revenue [Line Items]
Total revenue	318	1,806	606	3,335
AstraZeneca Agreements [Member] | Development Revenue [Member] | U.S./RoW and China [Member]
Disaggregation of Revenue [Line Items]
Total revenue	$ (50)	$ 2,273	$ 418	$ 4,305

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