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Other Balance Sheet Accounts - Summary of Prepaid Expenses and Other Current Assets (Detail) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Materials and supplies, net | $ 48,761 | $ 18,658
Inventories, net | 8,661 | 0
Prepaid expenses | 8,791 | 4,890
Accrued interest receivable | 9,495 | 2,221
Other current assets | 20,317 | 2,556
Total prepaid expenses and other current assets | $ 96,025 | $ 28,325

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