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Composition of Certain Financial Statement Items - Schedule of Property and Equipment (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Total property and equipment, gross	$ 30,590	$ 30,058
Less: accumulated depreciation and amortization	(24,297)	(23,103)
Total property and equipment, net	6,293	6,955
Machinery and equipment
Property, Plant and Equipment [Line Items]
Total property and equipment, gross	2,317	2,255
Software and software development
Property, Plant and Equipment [Line Items]
Total property and equipment, gross	2,406	2,404
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Total property and equipment, gross	1,422	1,257
Tooling
Property, Plant and Equipment [Line Items]
Total property and equipment, gross	8,036	7,855
Leasehold improvements
Property, Plant and Equipment [Line Items]
Total property and equipment, gross	1,752	1,794
Demonstration units and convention booths
Property, Plant and Equipment [Line Items]
Total property and equipment, gross	$ 14,657	$ 14,493

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- 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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