Balance Sheet Components - Components of Property and Equipment (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 43,106	$ 35,331
Less: Accumulated depreciation and amortization	(23,420)	(19,057)
Property and equipment, net	19,686	16,274	[1]
Computer Equipment [Member]
Property Plant And Equipment [Line Items]
Property and equipment, gross	23,675	21,422
Software [Member]
Property Plant And Equipment [Line Items]
Property and equipment, gross	13,451	11,022
Office Equipment [Member]
Property Plant And Equipment [Line Items]
Property and equipment, gross	830	795
Furniture, Fixtures and Leasehold Improvements [Member]
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 5,150	$ 2,092

[1] Derived from our audited consolidated financial statements as of December 31, 2014.