Balance Sheet Components - Property and Equipment, Net (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Property and Equipment, Net
Property and equipment, gross	$ 17,916	$ 15,958
Less: Accumulated depreciation and amortization	(7,640)	(6,966)
Property and equipment, net	10,276	8,992
Machinery and equipment
Property and Equipment, Net
Property and equipment, gross	11,209	10,573
Construction in progress
Property and Equipment, Net
Property and equipment, gross	3,844	3,657
Construction in progress, surgical placement instrument set
Property and Equipment, Net
Property and equipment, gross	3,800
Computer and office equipment
Property and Equipment, Net
Property and equipment, gross	924	916
Leasehold improvements
Property and Equipment, Net
Property and equipment, gross	1,630	503
Furniture and fixtures
Property and Equipment, Net
Property and equipment, gross	$ 309	$ 309

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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