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Revenue by Geographic Area (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Net sales $ 361,297 $ 289,323 $ 225,308
Taiwan      
Net sales 71,387 57,244 47,653
United States      
Net sales 39,558 26,265 22,528
Japan      
Net sales 19,636 11,180 3,936
Korea      
Net sales 150,118 150,557 115,287
China      
Net sales 69,623 35,008 29,129
Others      
Net sales $ 10,975 $ 9,069 $ 6,775