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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands	6 Months Ended
	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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Write-Off Of Convertible Notes Receivable

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Amount of cash inflow (outflow) from operating activity, including, but not limited to, discontinued operation. Operating activity includes, but is not limited to, transaction, adjustment, and change in value not defined as investing or financing activity.

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Amount of accumulated undistributed earnings (deficit).

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