Revenue Recognition - Additional Information (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Revenue Recognition [Abstract]
Period of revenue from services	1 month
Subscription revenue term, minimum	1 year
Subscription revenue term, maximum	3 years
Deferred revenue, revenue recognized	$ 2,471
Aggregate amount of transaction price from contractual obligations	$ 16,383	$ 17,921