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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 | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Business Segments |  |  |
Total net revenue | $ 16,600 | $ 8,842 | $ 6,024
North America |  |  |
Business Segments |  |  |
Total net revenue | 12,998 | 6,531 | 3,816
Japan |  |  |
Business Segments |  |  |
Total net revenue | 2,956 | 1,520 | 1,303
Taiwan |  |  |
Business Segments |  |  |
Total net revenue | 399 | 613 | 804
Rest of world |  |  |
Business Segments |  |  |
Total net revenue | $ 247 | $ 178 | $ 101

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