BALANCE SHEET COMPONENTS - SCHEDULE OF PROPERTY AND EQUIPMENT (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Property Plant And Equipment [Line Items]
Property and equipment – gross	$ 51,455	$ 45,507
Less: accumulated depreciation and amortization	(17,797)	(13,753)
Property and equipment – net	33,658	31,754
Computer equipment
Property Plant And Equipment [Line Items]
Property and equipment – gross	16,403	13,195
Leasehold improvements
Property Plant And Equipment [Line Items]
Property and equipment – gross	11,196	9,882
Capitalized software development costs
Property Plant And Equipment [Line Items]
Property and equipment – gross	1,878	1,888
Office equipment
Property Plant And Equipment [Line Items]
Property and equipment – gross	2,608	2,336
Software And License
Property Plant And Equipment [Line Items]
Property and equipment – gross	2,932	1,768
Building leased
Property Plant And Equipment [Line Items]
Property and equipment – gross	$ 16,438	$ 16,438