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Financial Statement Details - Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross $ 29,999 $ 29,902
Less—accumulated depreciation and amortization (28,897) (27,513)
Total property, plant and equipment, net 1,102 2,389
Test equipment    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross 19,600 19,600
Computer equipment and purchased software    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross 3,711 3,643
Product tooling    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross 5,182 5,153
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