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Details of Certain Financial Statement Components - Property, plant and equipment, net (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Property, Plant and Equipment, Net          
Property, plant and equipment, gross $ 2,313,000   $ 2,313,000   $ 2,105,000
Less: accumulated depreciation (2,008,000)   (2,008,000)   (1,921,000)
Total property, plant and equipment, net 305,000   305,000   184,000
Depreciation expense 42,000 $ 48,000 125,000 $ 150,000  
Furniture, machinery and equipment          
Property, Plant and Equipment, Net          
Property, plant and equipment, gross 1,910,000   1,910,000   1,688,000
Leasehold improvements          
Property, Plant and Equipment, Net          
Property, plant and equipment, gross $ 403,000   $ 403,000   $ 417,000