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Balance Sheet Components - Property and Equipment, Net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Property and Equipment, Net
Property and equipment, gross	$ 5,518	$ 4,918
Less: Accumulated depreciation and amortization	(3,364)	(3,022)
Property and equipment, net	2,154	1,896
Depreciation expense	700	1,000
Machinery and equipment
Property and Equipment, Net
Property and equipment, gross	3,785	3,428
Construction in progress
Property and Equipment, Net
Property and equipment, gross	730	879
Computer and office equipment
Property and Equipment, Net
Property and equipment, gross	407	310
Leasehold improvements
Property and Equipment, Net
Property and equipment, gross	448	272
Furniture and fixtures
Property and Equipment, Net
Property and equipment, gross	$ 148	$ 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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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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