CONDENSED CONSOLIDATED STATEMENTS OF REDEEMABLE CONVERTIBLE PREFERRED STOCK AND SHAREHOLDERS’ DEFICIT (UNAUDITED) - USD ($) $ in Thousands	Total	2018 & 2020 Warrants	2025 Warrants	Issuance of Series E Preferred Stock, net of issuance costs	Issuance of Series F Preferred Stock, net of issuance costs	Common Stock	Common Stock 2018 & 2020 Warrants	Common Stock 2025 Warrants	Treasury Stock	Additional Paid-In Capital	Additional Paid-In Capital 2018 & 2020 Warrants	Additional Paid-In Capital 2025 Warrants	Related Party Promissory Note Receivable	Accumulated Deficit	Accumulated Other Comprehensive Income
Beginning balance (in shares) at Dec. 31, 2023	734,142,041
Beginning balance at Dec. 31, 2023	$ 2,125,284
Redeemable Convertible Preferred Stock
Adjustment of preferred stock to redemption value	$ 46,707
Ending balance (in shares) at Jun. 30, 2024	734,142,041
Ending balance at Jun. 30, 2024	$ 2,171,991
Beginning balance (in shares) at Dec. 31, 2023						35,297,278
Beginning balance at Dec. 31, 2023	(2,144,950)					$ 38			$ (330)	$ 0			$ (25,701)	$ (2,119,175)	$ 218
Treasury stock, beginning balance (in shares) at Dec. 31, 2023									182,500
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	8,943									8,943
Issuance of common stock upon exercise of stock options (in share)						121,106
Issuance of common stock upon exercise of stock options	603									603
Interest income from related party promissory notes	(372)												(372)
Adjustment of preferred stock to redemption value	(46,707)									(9,546)				(37,161)
Other comprehensive income (loss)	107														107
Net income (loss)	(177,214)													(177,214)
Ending balance (in shares) at Jun. 30, 2024						35,418,384
Treasury stock, ending balance (in shares) at Jun. 30, 2024									182,500
Ending balance at Jun. 30, 2024	$ (2,359,590)					$ 38			$ (330)	0			(26,073)	(2,333,550)	325
Beginning balance (in shares) at Dec. 31, 2023	734,142,041
Beginning balance at Dec. 31, 2023	$ 2,125,284
Ending balance (in shares) at Dec. 31, 2024	734,142,041
Ending balance at Dec. 31, 2024	$ 2,221,651
Beginning balance (in shares) at Dec. 31, 2023						35,297,278
Beginning balance at Dec. 31, 2023	$ (2,144,950)					$ 38			$ (330)	0			(25,701)	(2,119,175)	218
Treasury stock, beginning balance (in shares) at Dec. 31, 2023									182,500
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Repurchases of common stock (in share)	0
Ending balance (in shares) at Dec. 31, 2024	36,504,319					35,842,319
Treasury stock, ending balance (in shares) at Dec. 31, 2024	182,500								182,500
Ending balance at Dec. 31, 2024	$ (2,498,838)					$ 38			$ (330)	0			(26,456)	(2,472,299)	210
Beginning balance (in shares) at Mar. 31, 2024	734,142,041
Beginning balance at Mar. 31, 2024	$ 2,148,397
Redeemable Convertible Preferred Stock
Adjustment of preferred stock to redemption value	$ 23,594
Ending balance (in shares) at Jun. 30, 2024	734,142,041
Ending balance at Jun. 30, 2024	$ 2,171,991
Beginning balance (in shares) at Mar. 31, 2024						35,336,582
Beginning balance at Mar. 31, 2024	(2,274,594)					$ 38			$ (330)	0			(25,887)	(2,248,648)	233
Treasury stock, beginning balance (in shares) at Mar. 31, 2024									182,500
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	4,485									4,485
Issuance of common stock upon exercise of stock options (in share)						81,802
Issuance of common stock upon exercise of stock options	393									393
Interest income from related party promissory notes	(186)												(186)
Adjustment of preferred stock to redemption value	(23,594)									(4,878)				(18,716)
Other comprehensive income (loss)	92														92
Net income (loss)	(66,186)													(66,186)
Ending balance (in shares) at Jun. 30, 2024						35,418,384
Treasury stock, ending balance (in shares) at Jun. 30, 2024									182,500
Ending balance at Jun. 30, 2024	(2,359,590)					$ 38			$ (330)	0			(26,073)	(2,333,550)	325
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total Shareholders' Equity (Deficit), adjusted	$ (2,498,837)
Beginning balance (in shares) at Dec. 31, 2024	734,142,041
Beginning balance at Dec. 31, 2024	$ 2,221,651
Redeemable Convertible Preferred Stock
Issuance of preferred stock, net of issuance costs (in shares)				12,345,674	4,657,401
Issuance of preferred stock, net of issuance costs				$ 57,493	$ 21,721
Adjustment of preferred stock to redemption value	$ 85,433
Conversion of preferred stock to common stock, including the derecognition of associated embedded derivatives (in shares)	(751,145,116)
Conversion of preferred stock to common stock, including the derecognition of associated embedded derivatives	$ (2,386,298)
Ending balance at Jun. 30, 2025	$ 0
Beginning balance (in shares) at Dec. 31, 2024	36,504,319					35,842,319
Beginning balance at Dec. 31, 2024	$ (2,498,838)					$ 38			$ (330)	0			(26,456)	(2,472,299)	210
Treasury stock, beginning balance (in shares) at Dec. 31, 2024	182,500								182,500
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	$ 42,984									42,984
Issuance of common stock upon exercise of stock options (in share)	686,254					1,348,121
Issuance of common stock upon exercise of stock options	$ 2,623									2,623
Common stock withheld for taxes and net exercises (in shares)						(134,959)
Common stock withheld for taxes and net exercises	(2,066)									(2,066)
Interest income from related party promissory notes	(128)												(128)
Payment of related party promissory notes	$ 26,584												26,584
Repurchases of common stock (in share)	(1,438,138)					(1,438,138)			(1,438,138)
Repurchases of common stock	$ (16,587)								$ (16,587)
Adjustment of preferred stock to redemption value	(85,433)									(77,084)				(8,349)
Conversion of preferred stock to common stock, including the derecognition of associated embedded derivatives (in shares)						211,378,638
Conversion of preferred stock to common stock, including the derecognition of associated embedded derivatives	2,446,384					$ 211				2,446,173
Issuance of common stock in connection with initial public offering, net of offering costs, underwriting discounts and commissions (in shares)						27,058,823
Issuance of common stock in connection with initial public offering, net of offering costs, underwriting discounts and commissions	519,452					$ 27				519,425
Net exercise of warrants in connection with initial public offering (in share)							4,174,907	784,231
Net exercise of warrants in connection with initial public offering		$ 131,746	$ 16,499				$ 4				$ 131,742	$ 16,499
Conversion of the 2025 Convertible Note, including the derecognition of associated embedded derivatives (in shares)						2,076,596
Conversion of the 2025 Convertible Note, including the derecognition of associated embedded derivatives	43,608					$ 2				43,606
Other comprehensive income (loss)	445									(14)					459
Net income (loss)	$ (174,370)													(174,370)
Ending balance (in shares) at Jun. 30, 2025	281,090,538					281,090,538
Treasury stock, ending balance (in shares) at Jun. 30, 2025	1,620,638								1,620,638
Ending balance at Jun. 30, 2025	$ 452,904					$ 282			$ (16,917)	3,123,888			0	(2,655,018)	669
Beginning balance (in shares) at Mar. 31, 2025	734,142,041
Beginning balance at Mar. 31, 2025	$ 2,246,113
Redeemable Convertible Preferred Stock
Issuance of preferred stock, net of issuance costs (in shares)				12,345,674	4,657,401
Issuance of preferred stock, net of issuance costs				$ 57,493	$ 21,721
Adjustment of preferred stock to redemption value	$ 60,971
Conversion of preferred stock to common stock, including the derecognition of associated embedded derivatives (in shares)	(751,145,116)
Conversion of preferred stock to common stock, including the derecognition of associated embedded derivatives	$ (2,386,298)
Ending balance at Jun. 30, 2025	0
Beginning balance (in shares) at Mar. 31, 2025						35,237,531
Beginning balance at Mar. 31, 2025	(2,599,865)					$ 38			$ (16,917)	0			0	(2,583,231)	245
Treasury stock, beginning balance (in shares) at Mar. 31, 2025									1,620,638
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	28,293									28,293
Issuance of common stock upon exercise of stock options (in share)						514,771
Issuance of common stock upon exercise of stock options	1,190									1,190
Common stock withheld for taxes and net exercises (in shares)						(134,959)
Common stock withheld for taxes and net exercises	(2,066)									(2,066)
Adjustment of preferred stock to redemption value	(60,971)									(60,974)				3
Conversion of preferred stock to common stock, including the derecognition of associated embedded derivatives (in shares)						211,378,638
Conversion of preferred stock to common stock, including the derecognition of associated embedded derivatives	2,446,384					$ 211				2,446,173
Issuance of common stock in connection with initial public offering, net of offering costs, underwriting discounts and commissions (in shares)						27,058,823
Issuance of common stock in connection with initial public offering, net of offering costs, underwriting discounts and commissions	519,452					$ 27				519,425
Net exercise of warrants in connection with initial public offering (in share)							4,174,907	784,231
Net exercise of warrants in connection with initial public offering		$ 131,746	$ 16,499				$ 4				$ 131,742	$ 16,499
Conversion of the 2025 Convertible Note, including the derecognition of associated embedded derivatives (in shares)						2,076,596
Conversion of the 2025 Convertible Note, including the derecognition of associated embedded derivatives	43,608					$ 2				43,606
Other comprehensive income (loss)	424														424
Net income (loss)	$ (71,790)													(71,790)
Ending balance (in shares) at Jun. 30, 2025	281,090,538					281,090,538
Treasury stock, ending balance (in shares) at Jun. 30, 2025	1,620,638								1,620,638
Ending balance at Jun. 30, 2025	$ 452,904					$ 282			$ (16,917)	$ 3,123,888			$ 0	$ (2,655,018)	$ 669