Balance Sheet Components - Schedule of Property and Equipment, Net (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2022	Dec. 31, 2021
Balance Sheet Components [Line Items]
Property and equipment, gross	$ 14,544	$ 13,911
Less: accumulated depreciation and amortization	(9,727)	(9,317)
Property and equipment, net	4,817	4,594
Computer and Software
Balance Sheet Components [Line Items]
Property and equipment, gross	$ 730	730
Property and equipment, useful life	2 years
Machinery and Equipment
Balance Sheet Components [Line Items]
Property and equipment, gross	$ 841	997
Property and equipment, useful life	3 years
Furniture and Fixtures
Balance Sheet Components [Line Items]
Property and equipment, gross	$ 48	48
Property and equipment, useful life	7 years
Tools and Dies
Balance Sheet Components [Line Items]
Property and equipment, gross	$ 949	941
Property and equipment, useful life	2 years
Construction in Progress
Balance Sheet Components [Line Items]
Property and equipment, gross	$ 456	428
Equipment Under Customer Usage Agreements
Balance Sheet Components [Line Items]
Property and equipment, gross	$ 11,365	10,612
Property and equipment, useful life	3 years
Leasehold Improvements
Balance Sheet Components [Line Items]
Property and equipment, gross	$ 155	$ 155
Property and equipment, useful life, description	Lesser of useful life or lease term

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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Describes the periods of time over which an entity anticipates to receive utility from its property, plant and equipment (that is, the periods of time over which an entity allocates the initial cost of its property, plant and equipment).

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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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- Definition

Line items represent balance sheet components.

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