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Financial Statement Details - Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	$ 27,150	$ 29,999
Less—accumulated depreciation and amortization	(26,063)	(28,897)
Total property, plant and equipment, net	1,087	1,102
Test equipment
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	16,213	19,600
Computer equipment and purchased software
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	4,234	3,711
Product tooling
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	5,197	5,182
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	739	739
Leasehold improvements
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	$ 767	$ 767

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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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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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