Consolidated Statements of Redeemable Convertible Preferred Stock and Stockholders’ Deficit - USD ($)	Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Other Comprehensive Loss [Member]	Accumulated Deficit [Member]	Redeemable Convertible Preferred Stock [Member]	Total
Beginning balance (in shares) at Dec. 31, 2022	4,943,764				39,422,361
Beginning balance at Dec. 31, 2022					$ 538,423,000
Increase (Decrease) in Temporary Equity [Roll Forward]
Issuance of Series F redeemable convertible preferred stock at $2.8505 per share, net of issuance costs of $5,904 (in shares)					61,344,029
Issuance of Series F redeemable convertible preferred stock at $2.8505 per share, net of issuance costs of $5,904					$ 168,957,000
Issuance of Series F-1 redeemable convertible preferred stock at $1.9098 per share upon conversion of convertible notes and accrued interest (in shares)					21,465,064
Issuance of Series F-1 redeemable convertible preferred stock at $1.9098 per share upon conversion of convertible notes and accrued interest					$ 61,186,000
Ending balance (in shares) at Dec. 31, 2023					122,231,454
Ending balance at Dec. 31, 2023					$ 768,566,000
Beginning balance at Dec. 31, 2022	$ 5,000	$ 58,436,000	$ 3,000	$ (752,084,000)		$ (693,640,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)	99,900
Issuance of common stock upon exercise of stock options		589,000				589,000
Deemed dividend upon down round of redeemable convertible preferred stock		26,794,000		(26,794,000)
Repurchase of common stock (in shares)	(102,739)
Repurchase of common stock		(228,000)				(228,000)
Stock-based compensation expense		11,874,000				11,874,000
Foreign currency translation (loss) gain			(504,000)			(504,000)
Net loss				(95,655,000)		(95,655,000)
Ending balance (in shares) at Dec. 31, 2023	4,940,925
Ending balance at Dec. 31, 2023	$ 5,000	97,465,000	(501,000)	(874,533,000)		$ (777,564,000)
Ending balance (in shares) at Dec. 31, 2024					122,231,454	122,231,454
Ending balance at Dec. 31, 2024					$ 768,566,000	$ 768,566,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)	1,181,123
Issuance of common stock upon exercise of stock options	$ 1,000	4,563,000				4,564,000
Stock-based compensation expense		10,213,000				10,213,000
Foreign currency translation (loss) gain			(271,000)			(271,000)
Net loss				(96,426,000)		$ (96,426,000)
Ending balance (in shares) at Dec. 31, 2024	6,122,048					6,122,048
Ending balance at Dec. 31, 2024	$ 6,000	112,241,000	(772,000)	(970,959,000)		$ (859,484,000)
Increase (Decrease) in Temporary Equity [Roll Forward]
Conversion of redeemable convertible preferred stock to common stock upon IPO (in shares)					(122,231,454)
Conversion of redeemable convertible preferred stock to common stock upon IPO						$ (768,566,000)
Ending balance (in shares) at Dec. 31, 2025						0
Ending balance at Dec. 31, 2025
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Conversion of redeemable convertible preferred stock to common stock upon IPO (in shares)	51,226,348
Conversion of redeemable convertible preferred stock to common stock upon IPO	$ 51,000	768,515,000				$ 768,566,000
Issuance of common stock upon IPO, net of underwriting discounts, commissions and offering costs (in shares)	19,166,667
Issuance of common stock upon IPO, net of underwriting discounts, commissions and offering costs	$ 19,000	332,368,000				332,387,000
Conversion of convertible notes to common stock upon IPO, net (in shares)	6,470,743
Conversion of convertible notes to common stock upon IPO, net	$ 6,000	94,133,000				94,139,000
Net exercise of common stock warrants (in shares)	1,646,317
Net exercise of common stock warrants	$ 2,000	64,728,000				$ 64,730,000
Issuance of common stock upon exercise of stock options (in shares)	617,134					617,134
Issuance of common stock upon exercise of stock options	$ 1,000	3,297,000				$ 3,298,000
Issuance of common stock upon vesting of restricted stock units, net of shares withheld (in shares)	31,340
Issuance of common stock upon vesting of restricted stock units, net of shares withheld		(510,000)				(510,000)
Stock-based compensation expense		13,965,000				13,965,000
Unrealized gain on investments, net			156,000			156,000
Foreign currency translation (loss) gain			191,000			191,000
Net loss				(116,791,000)		$ (116,791,000)
Ending balance (in shares) at Dec. 31, 2025	85,280,597					85,280,597
Ending balance at Dec. 31, 2025	$ 85,000	$ 1,388,737,000	$ (425,000)	$ (1,087,750,000)		$ 300,647,000