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Business Segments, Concentration of Credit Risk and Significant Customers - Schedule of Revenue from Shipment of Product and Licensing of its Technologies to Customers by Geographical Location (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Business Segments        
Total net revenue $ 1,337 $ 1,971 $ 3,843 $ 5,199
North America [Member]        
Business Segments        
Total net revenue 906 1,494 2,825 4,112
Japan [Member]        
Business Segments        
Total net revenue 274 343 548 593
Taiwan [Member]        
Business Segments        
Total net revenue 103 93 299 340
Rest of world [Member]        
Business Segments        
Total net revenue $ 54 $ 41 $ 171 $ 154