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Details of Certain Financial Statement Components - Property, plant and equipment, net (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Property, Plant and Equipment, Net    
Property, plant and equipment, gross $ 2,105 $ 2,140
Less: accumulated depreciation (1,921) (1,802)
Total property, plant and equipment, net 184 338
Depreciation expense 193 216
Furniture, machinery and equipment    
Property, Plant and Equipment, Net    
Property, plant and equipment, gross 1,688 1,696
Leasehold improvements    
Property, Plant and Equipment, Net    
Property, plant and equipment, gross $ 417 $ 444