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Financial Statement Details - Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 31,678	$ 31,439
Less—accumulated depreciation and amortization	(28,920)	(26,049)
Property, plant and equipment, net	2,758	5,390
Test equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	19,717	19,724
Computer equipment and purchased software
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	4,590	4,603
Product tooling
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	5,153	5,007
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,331	1,214
Vehicles
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	115	119
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 772	$ 772

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

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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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