Balance Sheet Components - Components of Property and Equipment (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 57,646	$ 57,125
Less: Accumulated depreciation and amortization	(38,471)	(36,544)
Property and equipment, net	19,175	20,581	[1]
Computer Equipment [Member]
Property Plant And Equipment [Line Items]
Property and equipment, gross	28,885	28,905
Software [Member]
Property Plant And Equipment [Line Items]
Property and equipment, gross	21,864	21,323
Office Equipment [Member]
Property Plant And Equipment [Line Items]
Property and equipment, gross	950	951
Furniture, Fixtures and Leasehold Improvements [Member]
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 5,947	$ 5,946

[1] Derived from our audited consolidated financial statements as of December 31, 2016.