Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated depreciation of leased physical assets used in the normal conduct of business to produce goods and services.

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The total charge for the use of long-lived depreciable assets subject to a lease meeting the criteria for capitalization.

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The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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CONSOLIDATED BALANCE SHEET COMPONENTS - Property and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Property and Equipment [Line Items]
Property and equipment, gross	$ 17,813		$ 17,813		$ 17,529
Less: Accumulated depreciation and amortization	(10,808)		(10,808)		(8,521)
Property and equipment, net	7,005		7,005		9,008
Capital Leased Assets, Gross	1,200		1,200		1,200
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation	400		400		200
Depreciation and amortization expense	700	$ 900	2,400	$ 2,700
Computer and other equipment
Property and Equipment [Line Items]
Property and equipment, gross	1,902		$ 1,902		1,920
Estimated useful lives			3 years
Manufacturing, research and development laboratory equipment
Property and Equipment [Line Items]
Property and equipment, gross	4,543		$ 4,543		4,314
Estimated useful lives			3 years
Software and Software Development Costs [Member]
Property and Equipment [Line Items]
Property and equipment, gross	8,217		$ 8,217		8,217
Estimated useful lives			5 years
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]
Property and equipment, gross	2,065		$ 2,065		2,070
Office furniture and equipment \| Minimum
Property and Equipment [Line Items]
Estimated useful lives			3 years
Office furniture and equipment \| Maximum
Property and Equipment [Line Items]
Estimated useful lives			7 years
Leasehold improvements
Property and Equipment [Line Items]
Property and equipment, gross	1,008		$ 1,008		$ 1,008
Construction in Progress [Member]
Property and Equipment [Line Items]
Property and equipment, gross	$ 78		$ 78