Revenue and Related Matters - Schedule of Disaggregation of Revenue by Geography and Recognition Timing (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation Of Revenue [Line Items]
Revenue	$ 128,670	$ 113,541	$ 242,451	$ 219,886
North America [Member]
Disaggregation Of Revenue [Line Items]
Revenue	105,371	94,770	196,267	183,179
Europe [Member]
Disaggregation Of Revenue [Line Items]
Revenue	15,587	11,788	30,669	23,575
Asia Pacific [Member]
Disaggregation Of Revenue [Line Items]
Revenue	6,322	5,727	12,715	10,778
'Other [Member]
Disaggregation Of Revenue [Line Items]
Revenue	$ 1,390	$ 1,256	$ 2,800	$ 2,354