Financial Statement Components - Components of Property and Equipment, Net (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Property Plant And Equipment [Line Items]
Total property and equipment	$ 64,868	$ 63,228
Less: accumulated depreciation and amortization	(37,379)	(35,068)
Property and equipment, net	27,489	28,160
Computer hardware and software
Property Plant And Equipment [Line Items]
Total property and equipment	50,236	49,774
Internal-use software development costs
Property Plant And Equipment [Line Items]
Total property and equipment	7,965	7,432
Furniture and fixtures
Property Plant And Equipment [Line Items]
Total property and equipment	4,224	3,610
Leasehold improvements
Property Plant And Equipment [Line Items]
Total property and equipment	$ 2,443	$ 2,412