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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
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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