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 of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

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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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Balance Sheet Components - Property (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Property and Equipment, net
Property and equipment, gross	$ 53,408		$ 51,626
Less: Accumulated depreciation and amortization	(21,656)		(19,337)
Total Property and Equipment, net	31,752		32,289
Impairment of assets	576	$ 20
Proceeds from sale of impaired machinery and equipment		$ 225
Cost of product revenues
Property and Equipment, net
Impairment of assets	600
Machinery and equipment
Property and Equipment, net
Property and equipment, gross	30,141		27,303
Furniture and fixtures
Property and Equipment, net
Property and equipment, gross	$ 1,143		1,087
Useful Life	3 years
Computer equipment
Property and Equipment, net
Property and equipment, gross	$ 3,249		861
Useful Life	3 years
Capitalized software held for internal use
Property and Equipment, net
Property and equipment, gross	$ 2,898		2,172
Useful Life	3 years
Leasehold improvements
Property and Equipment, net
Property and equipment, gross	$ 10,583		10,444
Construction-in-process
Property and Equipment, net
Property and equipment, gross	$ 5,394		$ 9,759
Minimum \| Machinery and equipment
Property and Equipment, net
Useful Life	3 years
Maximum \| Machinery and equipment
Property and Equipment, net
Useful Life	5 years