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Details of Certain Financial Statement Components - Property, plant and equipment, net (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Property, Plant and Equipment, Net          
Property, plant and equipment, gross $ 2,310,000   $ 2,310,000   $ 2,105,000
Less: accumulated depreciation (1,973,000)   (1,973,000)   (1,921,000)
Total property, plant and equipment, net 337,000   337,000   184,000
Depreciation expense 46,000 $ 50,000 83,000 $ 102,000  
Furniture, machinery and equipment          
Property, Plant and Equipment, Net          
Property, plant and equipment, gross 1,905,000   1,905,000   1,688,000
Leasehold improvements          
Property, Plant and Equipment, Net          
Property, plant and equipment, gross $ 405,000   $ 405,000   $ 417,000