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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 (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Business Segments |  |  |
Total net revenue | $ 10,086 | $ 16,600 | $ 8,842
North America [Member] |  |  |
Business Segments |  |  |
Total net revenue | 7,585 | 12,998 | 6,531
Japan [Member] |  |  |
Business Segments |  |  |
Total net revenue | 1,734 | 2,956 | 1,520
Taiwan [Member] |  |  |
Business Segments |  |  |
Total net revenue | 345 | 399 | 613
Rest of world [Member] |  |  |
Business Segments |  |  |
Total net revenue | $ 422 | $ 247 | $ 178

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