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Balance Sheet Components - Property and Equipment, Net (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Property and Equipment, Net
Property and equipment, gross	$ 5,244		$ 5,244		$ 4,918
Less: Accumulated depreciation and amortization	(3,196)		(3,196)		(3,022)
Property and equipment, net	2,048		2,048		1,896
Depreciation expense	200	$ 300	500	$ 800
Machinery and equipment
Property and Equipment, Net
Property and equipment, gross	3,670		3,670		3,428
Construction in progress
Property and Equipment, Net
Property and equipment, gross	660		660		879
Computer and office equipment
Property and Equipment, Net
Property and equipment, gross	325		325		310
Leasehold improvements
Property and Equipment, Net
Property and equipment, gross	443		443		272
Furniture and fixtures
Property and Equipment, Net
Property and equipment, gross	$ 146		$ 146		$ 29

X

- Definition

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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- Definition

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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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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