Consolidated Statements of Convertible Preferred Stock and Stockholders' Equity (Deficit) - USD ($)	Total	Conversion of redeemable convertible preferred stock to common stock in connection with initial public offering	Additional Paid-in Capital	Additional Paid-in Capital Conversion of redeemable convertible preferred stock to common stock in connection with initial public offering	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit	Class A	Class A Common Stock	Class A Common Stock Conversion of Class B common stock to Class A common stock	Class A Common Stock Conversion of redeemable convertible preferred stock to common stock in connection with initial public offering	Class B	Class B Common Stock	Class B Common Stock Conversion of Class B common stock to Class A common stock	Class B Common Stock Conversion of redeemable convertible preferred stock to common stock in connection with initial public offering
Beginning balance (in shares) at Dec. 31, 2022	73,021,449
Beginning balance at Dec. 31, 2022	$ 1,853,492,000
Ending balance (in shares) at Jun. 30, 2023	73,021,449
Ending balance at Jun. 30, 2023	$ 1,853,492,000
Beginning balance (in shares) at Dec. 31, 2022								6,381,936				51,410,111
Beginning balance at Dec. 31, 2022	(379,064,000)		$ 250,460,000		$ (3,792,000)	$ (625,738,000)		$ 0				$ 6,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options, net (in shares)								209,870				84,840
Issuance of common stock upon exercise of stock options, net	1,791,000		1,791,000
Issuance of common stock upon settlement of restricted stock units, net (in shares)								221,612
Issuance of common stock upon settlement of restricted stock units, net	(4,229,000)		(4,229,000)
Stock-based compensation expense	22,583,000		22,583,000
Vesting of early exercised stock options	481,000		481,000
Net income (loss)	(101,975,000)					(101,975,000)	$ (12,021,000)				$ (89,954,000)
Change in other comprehensive income (loss)	1,987,000				1,987,000
Ending balance (in shares) at Jun. 30, 2023								6,813,418				51,494,951
Ending balance at Jun. 30, 2023	$ (458,426,000)		271,086,000		(1,805,000)	(727,713,000)		$ 0				$ 6,000
Beginning balance (in shares) at Mar. 31, 2023	73,021,449
Beginning balance at Mar. 31, 2023	$ 1,853,492,000
Ending balance (in shares) at Jun. 30, 2023	73,021,449
Ending balance at Jun. 30, 2023	$ 1,853,492,000
Beginning balance (in shares) at Mar. 31, 2023								6,715,036				51,434,037
Beginning balance at Mar. 31, 2023	(427,915,000)		259,980,000		(1,297,000)	(686,604,000)		$ 0				$ 6,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options, net (in shares)								98,382				60,914
Issuance of common stock upon exercise of stock options, net	828,000		828,000
Stock-based compensation expense	10,103,000		10,103,000
Vesting of early exercised stock options	175,000		175,000
Net income (loss)	(41,109,000)					(41,109,000)	$ (4,952,000)				$ (36,157,000)
Change in other comprehensive income (loss)	(508,000)				(508,000)
Ending balance (in shares) at Jun. 30, 2023								6,813,418				51,494,951
Ending balance at Jun. 30, 2023	$ (458,426,000)		271,086,000		(1,805,000)	(727,713,000)		$ 0				$ 6,000
Beginning balance (in shares) at Dec. 31, 2023	73,021,449
Beginning balance at Dec. 31, 2023	$ 1,853,492,000
Total Convertible Preferred Stock
Conversion of redeemable convertible preferred stock to common stock in connection with initial public offering (in shares)	(73,021,449)
Conversion of redeemable convertible preferred stock to common stock in connection with initial public offering	$ (1,853,492,000)
Beginning balance (in shares) at Dec. 31, 2023							7,099,700	7,099,700			53,904,204	53,904,204
Beginning balance at Dec. 31, 2023	$ (412,922,000)		302,820,000		814,000	(716,562,000)		$ 0				$ 6,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options, net (in shares)	4,208,017							3,394,138				813,648
Issuance of common stock upon exercise of stock options, net	$ 24,932,000		24,932,000
Issuance of common stock upon settlement of restricted stock units, net (in shares)								8,162,928				661,497
Issuance of common stock upon settlement of restricted stock units, net	(202,852,000)		(202,853,000)					$ 1,000
Conversion of stock (in shares)									20,142,152	5,104,017			(20,142,152)	67,917,432
Conversion of stock	0	$ 1,853,494,000		$ 1,853,486,000					$ 2,000	$ 1,000			$ (2,000)	$ 7,000
Issuance of common stock in connection with initial public offering, net of underwriting discounts and commissions and other offering costs (in shares)								18,576,527
Issuance of common stock in connection with initial public offering, net of underwriting discounts and commissions and other offering costs	576,268,000		576,266,000					$ 2,000
Stock-based compensation expense	641,774,000		641,774,000
Vesting of early exercised stock options	124,000		124,000
Net income (loss)	(585,165,000)					(585,165,000)	$ (151,229,000)				$ (433,936,000)
Change in other comprehensive income (loss)	(1,818,000)				(1,818,000)
Ending balance (in shares) at Jun. 30, 2024							62,479,462	62,479,462			103,154,629	103,154,629
Ending balance at Jun. 30, 2024	$ 1,893,835,000		3,196,549,000		(1,004,000)	(1,301,727,000)		$ 6,000				$ 11,000
Beginning balance (in shares) at Mar. 31, 2024	0
Beginning balance at Mar. 31, 2024	$ 0
Beginning balance (in shares) at Mar. 31, 2024								44,286,735				119,059,756
Beginning balance at Mar. 31, 2024	1,838,300,000		3,130,384,000		(472,000)	(1,291,628,000)		$ 4,000				$ 12,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options, net (in shares)								252,962				7,700
Issuance of common stock upon exercise of stock options, net	1,843,000		1,843,000
Issuance of common stock upon settlement of restricted stock units, net (in shares)								1,989,556				37,382
Conversion of stock (in shares)									15,950,209				(15,950,209)
Conversion of stock	0	$ 2,000		$ 1,000					$ 2,000				$ (2,000)	$ 1,000
Stock-based compensation expense	64,266,000		64,266,000
Vesting of early exercised stock options	55,000		55,000
Net income (loss)	(10,099,000)					(10,099,000)	$ (3,034,000)				$ (7,065,000)
Change in other comprehensive income (loss)	(532,000)				(532,000)
Ending balance (in shares) at Jun. 30, 2024							62,479,462	62,479,462			103,154,629	103,154,629
Ending balance at Jun. 30, 2024	$ 1,893,835,000		$ 3,196,549,000		$ (1,004,000)	$ (1,301,727,000)		$ 6,000				$ 11,000