Geographic Information - Revenue by Geographic Area (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 343,899	$ 289,418	$ 1,029,664	$ 878,204
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	146,761	106,229	425,212	327,784
Japan
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	35,749	36,309	116,364	109,050
Germany
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	37,541	27,831	93,847	97,262
South Korea
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	16,902	12,943	72,833	45,468
France
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	17,226	14,035	46,825	44,638
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	18,057	14,568	43,904	38,616
Other Europe, Middle East and Africa (EMEA)
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	44,860	45,602	142,337	136,719
Other international
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 26,803	$ 31,901	$ 88,342	$ 78,667