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Revenue by Geographic Area (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Net sales | $ 556,146 | $ 361,297 | $ 289,323
Taiwan |  |  |
Net sales | 75,926 | 71,387 | 57,244
United States |  |  |
Net sales | 59,390 | 39,558 | 26,265
Japan |  |  |
Net sales | 17,070 | 19,636 | 11,180
Korea |  |  |
Net sales | 183,249 | 150,118 | 150,557
China |  |  |
Net sales | 151,112 | 69,623 | 35,008
Others |  |  |
Net sales | $ 69,399 | $ 10,975 | $ 9,069

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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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