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Stock-Based Compensation - Summary of Stock-based Compensation Expenses for Stock Options and Unvested Common Stock (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Stock-based compensation expense | $ 74,623 | $ 26,035 | $ 209,047 | $ 71,821
Cost of Sales [Member] |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Stock-based compensation expense | 4,247 | 1,332 | 7,125 | 3,392
Research and Development Expense [Member] |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Stock-based compensation expense | 31,766 | 13,907 | 125,392 | 37,840
Selling and Marketing Expense [Member] |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Stock-based compensation expense | 6,560 | 2,929 | 16,488 | 8,157
General and Administrative Expense [Member] |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Stock-based compensation expense | 30,372 | 6,399 | 56,361 | 18,218
Stock-based Compensation, Net Of Amounts Capitalized [Member] |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Stock-based compensation expense | 72,945 | 24,567 | 205,366 | 67,607
Capitalized Stock Based Compensation - Property And Equipment Net And Intangible Assets Net [Member] |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Stock-based compensation expense | $ 1,678 | $ 1,468 | $ 3,681 | $ 4,214

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