Property and Equipment, Net - Property and Equipment, Net (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	$ 39,859	$ 25,826
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	24,277	16,133
Turkey [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	7,140	666
India [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	4,571	5,255
United Kingdom [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	2,988	3,223
All Other Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	$ 883	$ 549