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Information about Products and Service (Detail) - Revenue - Product Concentration Risk | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
DSP Products (DSP Cores and Platforms) |  |  |
Revenue from External Customer [Line Items] |  |  |
Percentage of total revenues | 86.00% | 84.00% | 82.00%
Connectivity Products (Bluetooth, WiFi and SATA/SAS) |  |  |
Revenue from External Customer [Line Items] |  |  |
Percentage of total revenues | 14.00% | 16.00% | 18.00%

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