Segment and Geographic Information - Summary of Reconciliation of Segment Financial Information to Loss from Operations (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Income (loss) from operations	$ 310,403	$ 119,966	$ (161,201)
Total stock-based compensation expense	691,638	475,903	564,798
Reconciling items
Segment Reporting Information [Line Items]
Income (loss) from operations	310,403	119,966	(161,201)
Research and development expenses	342,813	306,560	265,808
General and administrative expenses	375,094	343,126	365,768
Total stock-based compensation expense	691,638	475,903	564,798
Operating Segments
Segment Reporting Information [Line Items]
Total contribution	$ 1,719,948	$ 1,245,555	$ 1,035,173

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