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Financial Statement Details - Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 31,439 $ 34,794
Less—accumulated depreciation and amortization (26,049) (26,692)
Property, plant and equipment, net 5,390 8,102
Test equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 19,724 19,095
Computer equipment and purchased software    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 4,603 7,618
Product tooling    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 5,007 4,350
Furniture and fixtures    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 1,214 1,214
Vehicles    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 119 1,654
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 772 $ 863