Composition of Certain Financial Statement Items - Reconciliation of Change in Estimated Allowance for Doubtful Accounts (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Allowance for doubtful accounts
Balance at beginning of the year	$ 3,857	$ 3,304	$ 1,837
Provision for expected credit losses	2,333	3,016	2,322
Write-offs and adjustments, net of recoveries	(1,941)	(2,463)	(855)
Balance at end of the year	$ 4,249	$ 3,857	$ 3,304