CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN REDEEMABLE CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS’ EQUITY (DEFICIT) - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income	Accumulated Deficit	Redeemable convertible Preferred Stock
Beginning balance, Redeemable Convertible Preferred Stock (in shares) at Dec. 31, 2023						90,891
Beginning balance, Redeemable Convertible Preferred Stock at Dec. 31, 2023						$ 255,127
Increase (Decrease) in Temporary Equity [Roll Forward]
Conversion of redeemable convertible preferred stock into common stock in connection with initial public offering (in shares)						(90,891)
Conversion of redeemable convertible preferred stock into common stock in connection with initial public offering						$ (255,127)
Ending balance, Redeemable Convertible Preferred Stock (in shares) at Mar. 31, 2024						0
Ending balance, Redeemable Convertible Preferred Stock at Mar. 31, 2024						$ 0
Beginning balance, shares outstanding (in shares) at Dec. 31, 2023		42,046
Beginning balance at Dec. 31, 2023	$ (97,701)	$ 4	$ 27,411	$ 259	$ (125,375)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Conversion of redeemable convertible preferred stock into common stock in connection with initial public offering (in shares)		90,891
Conversion of redeemable convertible preferred stock into common stock in connection with initial public offering	255,127	$ 9	255,118
Issuance of common stock in connection with initial public offering, net of offering costs, underwriting discounts and commissions (in shares)		19,759
Issuance of common stock in connection with initial public offering, net of offering costs, underwriting discounts and commissions	665,990	$ 2	665,988
Issuance of common stock upon exercise of stock options and vesting of early exercised stock options (in shares)		14
Issuance of common stock upon exercise of stock options and vesting of early exercised stock options	916		916
Issuance of common stock upon vesting of restricted stock units (in shares)		3,336
Issuance of common stock upon vesting of restricted stock units	1	$ 1
Shares of common stock withheld related to net settlement of restricted stock units		(559)
Shares of common stock withheld related to net settlement of equity awards	(20,111)		(20,111)
Repurchase of common stock upon termination (in shares)		(16)
Repurchase of common stock upon termination	(3)		(3)
Stock-based compensation	97,768		97,768
Warrants contra revenue	110		110
Unrealized gains (losses) on marketable securities	(318)			(318)
Net income (loss)	(92,995)				(92,995)
Ending balance, shares outstanding (in shares) at Mar. 31, 2024		155,471
Ending balance at Mar. 31, 2024	$ 808,784	$ 16	1,027,197	(59)	(218,370)
Beginning balance, shares outstanding (in shares) at Dec. 31, 2024	162,018	162,018
Beginning balance at Dec. 31, 2024	$ 964,799	$ 16	1,173,153	426	(208,796)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options and vesting of early exercised stock options (in shares)	575	575
Issuance of common stock upon exercise of stock options and vesting of early exercised stock options	$ 522		522
Issuance of common stock upon vesting of restricted stock units (in shares)		2,314
Issuance of common stock upon vesting of restricted stock units	0
Stock-based compensation	42,446		42,446
Warrants contra revenue	374		374
Unrealized gains (losses) on marketable securities	1,602			1,602
Net income (loss)	$ 31,819				31,819
Ending balance, shares outstanding (in shares) at Mar. 31, 2025	164,907	164,907
Ending balance at Mar. 31, 2025	$ 1,041,562	$ 16	$ 1,216,495	$ 2,028	$ (176,977)