Summary of Restricted Stock Unit Activity (Detail) - USD ($) $ in Thousands		9 Months Ended	12 Months Ended
		Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021
Options Outstanding
Unvested at December 31, 2021		606,685
Awarded		159,117
Vested		(190,152)
Forfeited/expired/cancelled		(43,394)
Restricted stock units, outstanding		532,256	606,685
Vested and expected to vest at September 30, 2022	[1]	516,326
Weighted-Average Remaining Contractual Term (in years)
Unvested at December 31, 2021		2 years 11 months 4 days	3 years 25 days
Vested and expected to vest at September 30, 2022	[1]	2 years 5 months 23 days
Aggregate Intrinsic Value
Unvested at September 30, 2022		$ 99,590	$ 160,674
Vested and expected to vest at September 30, 2022	[1]	$ 96,610
Restricted Stock Units and Performance Stock Units
Options Outstanding
Restricted stock units, outstanding		532,256		619,761

[1] Represents the number of vested stock units as of September 30, 2022 plus the number of unvested stock units expected to vest as of September 30, 2022 based on the unvested outstanding stock units at September 30, 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.