Balance Sheet Components - Property and Equipment, Net (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Property and Equipment, Net
Property and equipment, gross	$ 9,484	$ 7,749
Less: Accumulated depreciation and amortization	(4,957)	(3,795)
Property and equipment, net	4,527	3,954
Depreciation expense	1,100	800
Machinery and equipment
Property and Equipment, Net
Property and equipment, gross	6,342	4,613
Construction in progress
Property and Equipment, Net
Property and equipment, gross	1,692	1,854
Computer and office equipment
Property and Equipment, Net
Property and equipment, gross	714	598
Leasehold improvements
Property and Equipment, Net
Property and equipment, gross	503	497
Furniture and fixtures
Property and Equipment, Net
Property and equipment, gross	$ 233	$ 187

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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