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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, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Property, Plant and Equipment, Net          
Property, plant and equipment, gross $ 2,256,000   $ 2,256,000   $ 2,421,000
Less: accumulated depreciation (2,002,000)   (2,002,000)   (2,108,000)
Total property, plant and equipment, net 254,000   254,000   313,000
Depreciation expense 37,000 $ 46,000 77,000 $ 83,000  
Furniture, machinery and equipment          
Property, Plant and Equipment, Net          
Property, plant and equipment, gross 1,852,000   1,852,000   2,009,000
Leasehold improvements          
Property, Plant and Equipment, Net          
Property, plant and equipment, gross $ 404,000   $ 404,000   $ 412,000