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CONCENTRATION OF RISK - Revenues by Geographic Area (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Concentration Risk [Line Items] |  |  |  |
Revenues | $ 61,683 | $ 30,214 | $ 219,762 | $ 124,309
South Korea [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Revenues | 45,803 | 24,852 | 185,937 | 111,994
China [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Revenues | 10,234 | 2,095 | 18,130 | 5,663
Japan [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Revenues | 2,462 | 1,230 | 5,590 | 3,334
Other Non-U.S. Locations [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Revenues | 597 | 396 | 2,132 | 1,416
Total Non-U.S. Locations [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Revenues | 59,096 | 28,573 | 211,789 | 122,407
UNITED STATES |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Revenues | $ 2,587 | $ 1,641 | $ 7,973 | $ 1,902

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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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