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Details of Certain Financial Statement Components - Property, plant and equipment, net (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Property, plant and equipment, net    
Property, plant and equipment, gross $ 2,140 $ 2,200
Less: accumulated depreciation (1,802) (1,793)
Total property, plant and equipment, net 338 407
Depreciation expense 216 233
Furniture, machinery and equipment    
Property, plant and equipment, net    
Property, plant and equipment, gross 1,696 1,662
Leasehold improvements    
Property, plant and equipment, net    
Property, plant and equipment, gross $ 444 $ 538