CONSOLIDATED BALANCE SHEET COMPONENTS - Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Property and Equipment [Line Items]
Property and equipment, gross	$ 16,305	$ 14,197
Less: Accumulated depreciation and amortization	(7,149)	(5,335)
Property and equipment, net	9,156	8,862
Depreciation and amortization expense	$ 3,500	2,200	$ 1,400
Minimum
Property and Equipment [Line Items]
Estimated useful lives	2 years
Maximum
Property and Equipment [Line Items]
Estimated useful lives	5 years
Computer and other equipment
Property and Equipment [Line Items]
Estimated useful lives	3 years
Property and equipment, gross	$ 1,704	1,822
Manufacturing, research and development laboratory equipment
Property and Equipment [Line Items]
Estimated useful lives	3 years
Property and equipment, gross	$ 4,476	3,741
Software and Software Development Costs [Member]
Property and Equipment [Line Items]
Estimated useful lives	5 years
Property and equipment, gross	$ 8,470	1,882
Software and Software Development Costs [Member] | Minimum
Property and Equipment [Line Items]
Estimated useful lives	2 years
Software and Software Development Costs [Member] | Maximum
Property and Equipment [Line Items]
Estimated useful lives	5 years
Office furniture and equipment
Property and Equipment [Line Items]
Estimated useful lives	3 years
Property and equipment, gross	$ 1,041	761
Leasehold improvements
Property and Equipment [Line Items]
Property and equipment, gross	$ 614	532
Leasehold improvements | Minimum
Property and Equipment [Line Items]
Estimated useful lives	2 years
Leasehold improvements | Maximum
Property and Equipment [Line Items]
Estimated useful lives	5 years
Construction in progress
Property and Equipment [Line Items]
Property and equipment, gross	$ 0	$ 5,459