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Segment, Customer Concentration and Geographical Information - Revenues Generated by Each Business Unit (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ 5,732 | $ 5,804 | $ 5,862 | $ 5,576 | $ 7,084 | $ 6,478 | $ 7,459 | $ 7,214 | $ 22,974 | $ 28,235 | $ 39,507
Cost of revenues |  |  |  |  |  |  |  |  | 5,082 | 7,564 | 8,152
Gross profit | $ 4,377 | $ 4,645 | $ 4,577 | $ 4,293 | $ 5,343 | $ 4,680 | $ 5,547 | $ 5,101 | 17,892 | 20,671 | 31,355
Wireless [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 18,342 | 23,086 | 33,553
Graphics [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | $ 4,632 | $ 5,149 | $ 5,954

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