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Details of Certain Financial Statement Components - Property, plant and equipment, net (Details) - USD ($)
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Property, Plant and Equipment, Net    
Property, plant and equipment, gross $ 2,421,000 $ 2,105,000
Less: accumulated depreciation (2,108,000) (1,921,000)
Total property, plant and equipment, net 313,000 184,000
Depreciation expense 200,000 193,000
Furniture, machinery and equipment    
Property, Plant and Equipment, Net    
Property, plant and equipment, gross 2,009,000 1,688,000
Leasehold improvements    
Property, Plant and Equipment, Net    
Property, plant and equipment, gross $ 412,000 $ 417,000