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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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