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Revenues Based on Customer Location (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |
Total revenues | $ 87,507 | $ 72,653 | $ 59,499
United States |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 7,188 | 9,134 | 9,737
Europe, Middle East |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 11,007 | 10,901 | 7,064
Asia Pacific |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 69,312 | 52,618 | 42,698
China |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 41,059 | 30,030 | 29,982
S. Korea |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | $ 17,842 | $ 15,512 | $ 6,173

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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + 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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