Consolidated Balance Sheet Components - Property and Equipment, Net (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 25,376	$ 16,852
Less: accumulated depreciation and amortization	(13,212)	(9,234)
Total property and equipment, net	12,164	7,618
Computers and related equipment [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	15,953	11,591
Office furniture and equipment [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	1,632	1,510
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 7,791	$ 3,751