Balance Sheet Components - Components of Property and Equipment (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 56,126	$ 49,946
Less: Accumulated depreciation and amortization	(34,608)	(28,129)
Property and equipment, net	21,518	21,817	[1]
Computer Equipment [Member]
Property Plant And Equipment [Line Items]
Property and equipment, gross	28,353	26,279
Software [Member]
Property Plant And Equipment [Line Items]
Property and equipment, gross	20,662	16,602
Office Equipment [Member]
Property Plant And Equipment [Line Items]
Property and equipment, gross	1,038	1,016
Furniture, Fixtures and Leasehold Improvements [Member]
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 6,073	$ 6,049

[1] Derived from our audited consolidated financial statements as of December 31, 2015.