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CONCENTRATION OF RISK - Revenues by Geographic Area (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | [1] | Sep. 30, 2017 | Jun. 30, 2017 | [1] | Mar. 31, 2017 | Dec. 31, 2016 | [1] | Sep. 30, 2016 | Jun. 30, 2016 | [1] | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 115,867 | $ 61,683 | $ 102,513 | $ 55,566 | $ 74,577 | $ 30,214 | $ 64,392 | $ 29,703 | $ 335,629 | $ 198,886 | $ 191,046
South Korea [Member] |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 289,418 | 181,771 | 168,267
China [Member] |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 24,892 | 7,180 | 2,685
Japan [Member] |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 8,542 | 4,310 | 16,542
Other Non-U.S. Locations [Member] |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 2,438 | 1,849 | 2,334
Total Non-U.S. Locations [Member] |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 325,290 | 195,110 | 189,828
UNITED STATES |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 10,339 | $ 3,776 | $ 1,218
[1] | The Company receives significant license revenue in the second and fourth quarters; see Note 2 for further details.

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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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