Condensed Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Loss
Beginning balance (in shares) at Dec. 31, 2024		132,646
Beginning balance at Dec. 31, 2024	$ 1,195,420	$ 12	$ 3,763,614	$ (2,567,862)	$ (344)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)		69
Issuance of common stock upon exercise of stock options	884		884
Issuance of common stock under the employee stock purchase plan (in shares)		116
Issuance of common stock under the employee stock purchase plan	12,236		12,236
Issuance of common stock for bonus (in shares)		228
Issuance of common stock for bonus	32,875		32,875
Vesting of restricted stock units (in shares)		3,698
Vesting of restricted stock units	2	$ 2
Stock-based compensation	172,582		172,582
Unrealized gain (loss) on available-for sale securities, net of tax and foreign currency translation adjustment	57				57
Net loss	(167,874)			(167,874)
Ending balance (in shares) at Jun. 30, 2025		136,757
Ending balance at Jun. 30, 2025	1,246,182	$ 14	3,982,191	(2,735,736)	(287)
Beginning balance (in shares) at Mar. 31, 2025		135,932
Beginning balance at Mar. 31, 2025	1,239,675	$ 14	3,874,656	(2,634,798)	(197)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)		19
Issuance of common stock upon exercise of stock options	340		340
Issuance of common stock under the employee stock purchase plan (in shares)		116
Issuance of common stock under the employee stock purchase plan	12,236		12,236
Issuance of common stock for bonus (in shares)		6
Issuance of common stock for bonus	812		812
Vesting of restricted stock units (in shares)		684
Stock-based compensation	94,147		94,147
Unrealized gain (loss) on available-for sale securities, net of tax and foreign currency translation adjustment	(90)				(90)
Net loss	(100,938)			(100,938)
Ending balance (in shares) at Jun. 30, 2025		136,757
Ending balance at Jun. 30, 2025	$ 1,246,182	$ 14	3,982,191	(2,735,736)	(287)
Beginning balance (in shares) at Dec. 31, 2025	139,693	139,693
Beginning balance at Dec. 31, 2025	$ 1,712,413	$ 14	4,488,679	(2,776,022)	(258)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)	454	454
Issuance of common stock upon exercise of stock options	$ 4,796		4,796
Issuance of common stock under the employee stock purchase plan (in shares)		97
Issuance of common stock under the employee stock purchase plan	16,430		16,430
Issuance of common stock for bonus (in shares)		229
Issuance of common stock for bonus	47,026		47,026
Vesting of restricted stock units (in shares)		3,158
Cash paid to satisfy statutory withholding requirement for net settlement of cashless stock option exercises (in shares)		(28)
Cash paid to satisfy statutory withholding requirement for net settlement of cashless stock option exercises	(5,097)		(5,097)
Issuance of common stock pursuant to asset acquisition, net (in shares)		10
Issuance of common stock pursuant to asset acquisition, net	2,000		2,000
Cancellation of escrow shares pursuant to business combination, net (in shares)		(1)
Cancellation of escrow shares pursuant to business combination, net	(323)		(323)
Stock-based compensation	196,164		196,164
Unrealized gain on available-for sale securities	150				150
Net loss	$ (152,060)			(152,060)
Ending balance (in shares) at Jun. 30, 2026	143,612	143,612
Ending balance at Jun. 30, 2026	$ 1,821,499	$ 14	4,749,675	(2,928,082)	(108)
Beginning balance (in shares) at Mar. 31, 2026		142,734
Beginning balance at Mar. 31, 2026	1,774,018	$ 14	4,635,319	(2,861,113)	(202)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)		108
Issuance of common stock upon exercise of stock options	933		933
Issuance of common stock under the employee stock purchase plan (in shares)		98
Issuance of common stock under the employee stock purchase plan	16,430		16,430
Vesting of restricted stock units (in shares)		700
Cash paid to satisfy statutory withholding requirement for net settlement of cashless stock option exercises (in shares)		(28)
Cash paid to satisfy statutory withholding requirement for net settlement of cashless stock option exercises	(5,097)		(5,097)
Stock-based compensation	102,090		102,090
Unrealized gain (loss) on available-for sale securities, net of tax and foreign currency translation adjustment	94				94
Net loss	$ (66,969)			(66,969)
Ending balance (in shares) at Jun. 30, 2026	143,612	143,612
Ending balance at Jun. 30, 2026	$ 1,821,499	$ 14	$ 4,749,675	$ (2,928,082)	$ (108)