Consolidated Balance Sheet Components - Property and Equipment, Net (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 40,460	$ 25,376
Less: accumulated depreciation and amortization	(18,964)	(13,212)
Total property and equipment, net	21,496	12,164
Computers and related equipment [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	25,285	15,953
Office furniture and equipment [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	3,228	1,632
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 11,947	$ 7,791