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Revenue by Product Category (Detail) - USD ($)
$ in Thousands
12 Months Ended
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