BALANCE SHEET COMPONENTS - SCHEDULE OF ACCRUED EXPENSES AND OTHER LIABILITIES(Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Accrued Liabilities and Other Liabilities [Abstract]
Accrued payroll	$ 6,396	$ 3,918
Accrued vacation	2,224	1,699
Employee stock purchase plan contributions	427	1,496
Other liabilities	1,052	798
Total accrued expenses and other liabilities	$ 10,099	$ 7,911