Summary of Option Activity (Detail) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended	12 Months Ended
		Mar. 31, 2022	Dec. 31, 2021
Options Outstanding
Options outstanding at December 31, 2021| shares		625,107
Granted | shares		34,473
Exercised | shares		(9,521)
Forfeited/expired/cancelled		0
Options outstanding at March 31, 2022 | shares		650,059	625,107
Options exercisable at March 31, 2021 | shares		376,069
Vested and expected to vest at March 31, 2022(1) | shares	[1]	631,360
Weighted-Average Exercise Price Per Share
Options outstanding at December 31, 2021		$ 54.15
Granted		189.21
Exercised		31.12
Forfeited/expired/cancelled		0
Options outstanding at March 31, 2022		61.65	$ 54.15
Options exercisable at March 31, 2022		$ 42.55
Weighted-Average Remaining Contractual Term (in years)
Options outstanding		6 years 3 months 7 days	6 years 3 months 14 days
Options exercisable at March 31, 2022		5 years 7 months 9 days
Vested and expected to vest at March 31, 2022		6 years 3 months 3 days
Aggregate Intrinsic Value
Options outstanding		$ 82,990	$ 131,707
Options exercisable at March 31, 2022		54,931
Vested and expected to vest at March 31, 2022		$ 80,798

[1] Represents the number of vested options as of March 31, 2022 plus the number of unvested options expected to vest as of March 31, 2022 based on the unvested outstanding options at March 31, 2022 adjusted for estimated forfeiture rates of 8% for awards granted to non-executive level employees and 3% for awards granted to executive level employees.