Balance Sheet Components - Property and Equipment, Net (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Property and Equipment, Net
Property and equipment, gross	$ 7,749	$ 5,518
Less: Accumulated depreciation and amortization	(3,795)	(3,364)
Property and equipment, net	3,954	2,154
Depreciation expense	800	700
Machinery and equipment
Property and Equipment, Net
Property and equipment, gross	4,613	3,785
Construction in progress
Property and Equipment, Net
Property and equipment, gross	1,854	730
Computer and office equipment
Property and Equipment, Net
Property and equipment, gross	598	407
Leasehold improvements
Property and Equipment, Net
Property and equipment, gross	497	448
Furniture and fixtures
Property and Equipment, Net
Property and equipment, gross	$ 187	$ 148

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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