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Revenues Based on Customer Location (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Segment Reporting Information [Line Items] |  |
Total revenues | $ 17,569 | $ 21,287
United States |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 1,707 | 1,303
Europe and Middle East |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 2,453 | 3,931
Asia Pacific |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 13,409 | 16,053
China |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 6,152 | 9,742
S. Korea |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 2,802 | $ 3,749
Japan |  |
Segment Reporting Information [Line Items] |  |
Total revenues | $ 2,624 |

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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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