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Revenue by Geographic Area (Detail) - USD ($) $ in Thousands | 12 Months Ended
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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

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