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Stock-Based Compensation - Additional Information (Detail) - USD ($)	1 Months Ended	3 Months Ended		9 Months Ended
	Jul. 31, 2021	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Stock-based compensation epxense		$ 22,314,000	$ 15,459,000	$ 64,768,000	$ 44,441,000
Weighted average grant-date fair value of stock options granted		$ 50.94	$ 51.79	$ 50.79	$ 51.79
Aggregate intrinsic value of stock options exercised		$ 14,300,000	$ 32,500,000	$ 37,400,000	$ 72,600,000
2021 Stock Option and Incentive Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Stock awards granted, expiration period	10 years
2021 Stock Option and Incentive Plan [Member] \| Common Class A [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Shares available for future issuance		8,419,747		8,419,747
2021 Employee Stock Purchase Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Number of shares issued				7,843
2021 Employee Stock Purchase Plan [Member] \| Common Class A [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Shares available for future issuance		2,332,718		2,332,718
PSUs [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Stock-based compensation epxense		$ 0		$ 0
Unrecognized compensation cost related to common stock options		$ 11,100,000		$ 11,100,000
Number of Shares, outstanding		141,935		141,935
Excluding PSUs [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Unrecognized compensation cost related to common stock options		$ 179,700,000		$ 179,700,000
Share based payment weighted average period				2 years 4 months 24 days
RSUs
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Total fair value of RSUs vested		$ 1,500,000		$ 18,100,000
Number of Shares, outstanding		1,074,635		1,074,635		716,921
Number of Shares, Vested			0	(242,905)	0
Maximum [Member] \| 2021 Stock Option and Incentive Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Stock awards granted, vesting period	4 years
Minimum [Member] \| 2021 Stock Option and Incentive Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Stock awards granted, vesting period	3 years