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N. SEGMENT AND GEOGRAPHIC INFORMATION - REVENUES (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Mar. 31, 2015 USD ($) | Dec. 31, 2016 USD ($) item | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Number of Reportable segment | item |  |  |  |  |  |  |  |  | 1 |  |
Revenues | $ 84,900 | $ 70,137 | $ 55,254 | $ 50,422 | $ 52,952 | $ 57,085 | $ 49,632 | $ 30,234 | $ 260,713 | $ 189,903 | $ 130,449
UNITED STATES |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 18,035 | 16,766 | 30,723
TAIWAN, PROVINCE OF CHINA |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 161,611 | 141,107 | 77,680
CHINA |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 81,067 | $ 32,030 | $ 22,046

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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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