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Revenue by Product Category (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Segment Reporting Information [Line Items]      
Net sales $ 361,297 $ 289,323 $ 225,308
Mobile Storage      
Segment Reporting Information [Line Items]      
Net sales 302,910 241,614 185,488
Mobile Communications      
Segment Reporting Information [Line Items]      
Net sales 50,896 40,034 31,022
Others      
Segment Reporting Information [Line Items]      
Net sales $ 7,491 $ 7,675 $ 8,798