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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands | 6 Months Ended |
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Jun. 30, 2026 | Jun. 30, 2025 | Dec. 31, 2025
Accounting Policies [Abstract] |  |  |
Write-off of convertible note receivable | $ 7,442 | $ 0 |
Accumulated deficit | 4,589,806 |  | $ 3,726,646
Net cash used in operating activities | $ 141,853 | $ 165,651 |

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