Basis of Presentation and Summary of Significant Accounting Policies - Summary of Disaggregation of Revenue (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Revenues	$ 115,133	$ 95,284	$ 323,492	$ 253,674
Direct Platform Revenues [Member]
Disaggregation of Revenue [Line Items]
Revenues	84,663	63,346	242,219	180,589
Integrated Platform Revenues [Member]
Disaggregation of Revenue [Line Items]
Revenues	$ 30,470	$ 31,938	$ 81,273	$ 73,085