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Composition of Certain Financial Statement Items - Schedule of Property and Equipment (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Total property and equipment, gross	$ 31,624	$ 30,058
Less: accumulated depreciation and amortization	(25,480)	(23,103)
Total property and equipment, net	6,144	6,955
Machinery and equipment
Property, Plant and Equipment [Line Items]
Total property and equipment, gross	2,383	2,255
Software and software development
Property, Plant and Equipment [Line Items]
Total property and equipment, gross	2,400	2,404
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Total property and equipment, gross	1,440	1,257
Tooling
Property, Plant and Equipment [Line Items]
Total property and equipment, gross	8,494	7,855
Leasehold improvements
Property, Plant and Equipment [Line Items]
Total property and equipment, gross	1,708	1,794
Demonstration units and convention booths
Property, Plant and Equipment [Line Items]
Total property and equipment, gross	$ 15,199	$ 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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