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Revenue by Product Category (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Segment Reporting Information [Line Items] |  |  |
Net sales | $ 556,146 | $ 361,297 | $ 289,323
Mobile Storage |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 510,687 | 302,910 | 241,614
Mobile Communications |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 39,322 | 50,896 | 40,034
Others |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | $ 6,137 | $ 7,491 | $ 7,675

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