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Segment and Geographic Information - Summary of Reconciliation of Segment Financial Information to Loss from Operations (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Segment Reporting Information [Line Items]
Income from operations	$ 393,256	$ 113,140	$ 838,621	$ 299,360
Total stock-based compensation expense	172,318	142,425	487,628	409,840
Reconciling items
Segment Reporting Information [Line Items]
Income from operations	393,256	113,140	838,621	299,360
Research and development expenses	109,142	86,840	315,172	248,844
General and administrative expenses	103,370	90,819	316,758	266,136
Total stock-based compensation expense	172,318	142,425	487,628	409,840
Operating Segments
Segment Reporting Information [Line Items]
Contribution	$ 778,086	$ 433,224	$ 1,958,179	$ 1,224,180

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