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Redeemable Convertible Preferred Stock, Redeemable Common Stock, and Stockholders’ Equity (Deficit) - Employee Stock Purchase Plan (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Compensation expense	$ 144,431,000	$ 7,617,000	$ 473,409,000	$ 23,466,000
Unrecognized compensation costs, stock options	$ 63,000,000		$ 63,000,000
ESPP | 2025 Employee Stock Purchase Plan
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Number of shares authorized (in shares)	10,000,000,000,000		10,000,000,000,000
Percentage of outstanding stock maximum			1.00%
Maximum number of shares allowable under plan	100,000,000,000,000		100,000,000,000,000
Purchase price of common stock			85.00%
Shares issued (in shares)			0
Compensation expense	$ 0
Unrecognized compensation costs, stock options	$ 0		$ 0

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