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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
Mar. 31, 2021
Mar. 31, 2020
Business Segments    
Total net revenue $ 1,338 $ 1,260
North America [Member]    
Business Segments    
Total net revenue 948 812
Japan [Member]    
Business Segments    
Total net revenue 274 237
Taiwan [Member]    
Business Segments    
Total net revenue 79 138
Rest of world [Member]    
Business Segments    
Total net revenue $ 37 $ 73