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Related-Party Debt - Change in Carrying Value (Detail) - Convertible Note - December 2024 Convertible Promissory Note - Affiliated Entity - USD ($) $ in Thousands | 3 Months Ended
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Jun. 30, 2026 | Mar. 31, 2026
Long-Term Debt, Fair Value Disclosure [Roll Forward] |  |
Fair value, beginning balance | $ 678,386 | $ 477,093
Change in fair value of related-party convertible note | 95,964 | 236,625
Conversion to common stock |  | (35,332)
Fair value, ending balance | $ 774,350 | $ 678,386

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