Revenue - Summary of Total Revenue by Geographic Area Based on the Billing Address of its Customers (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenue, Major Customer [Line Items]
Revenues	$ 169,557	$ 117,602	$ 468,255	$ 325,550
UNITED STATES [Member]
Revenue, Major Customer [Line Items]
Revenues	139,564	98,606	379,161	273,407
All Other Countries [Member]
Revenue, Major Customer [Line Items]
Revenues	$ 29,993	$ 18,996	$ 89,094	$ 52,143