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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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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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, 2018	Mar. 31, 2017	Dec. 31, 2017
Property and Equipment, net
Property and equipment, gross	$ 55,723		$ 56,652
Less: Accumulated depreciation and amortization	(28,845)		(26,985)
Total Property and Equipment, net	26,878		29,667
Impairment of assets	1,544	$ 576
Cost of product revenues
Property and Equipment, net
Impairment of assets	1,600
Machinery and equipment
Property and Equipment, net
Property and equipment, gross	32,022		31,825
Furniture and fixtures
Property and Equipment, net
Property and equipment, gross	$ 1,265		1,216
Useful Life	3 years
Computer equipment
Property and Equipment, net
Property and equipment, gross	$ 2,028		1,958
Useful Life	3 years
Capitalized software held for internal use
Property and Equipment, net
Property and equipment, gross	$ 4,465		4,465
Useful Life	3 years
Leasehold improvements
Property and Equipment, net
Property and equipment, gross	$ 10,745		10,691
Construction-in-process
Property and Equipment, net
Property and equipment, gross	$ 5,198		$ 6,497
Minimum \| Machinery and equipment
Property and Equipment, net
Useful Life	3 years
Maximum \| Machinery and equipment
Property and Equipment, net
Useful Life	5 years