Changes in Deferred Revenue (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Revenue From Contract With Customer [Abstract]
Deferred revenue	$ 2,433	$ 2,366
Deferral of revenue billed in current period, net of recognition	2,029	1,992
Recognition of revenue deferred in prior periods	(1,916)	(1,749)
Deferred revenue	$ 2,546	$ 2,609