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CONCENTRATION OF RISK - Revenues by Geographic Area (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Concentration Risk [Line Items] |  |  |  |
Revenues | $ 64,392 | $ 58,092 | $ 94,095 | $ 89,315
South Korea [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Revenues | 61,196 | 53,822 | 87,142 | 76,033
China [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Revenues | 1,812 | 291 | 3,569 | 680
Japan [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Revenues | 800 | 2,886 | 2,104 | 10,656
Other [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Revenues | 405 | 576 | 1,018 | 1,204
Total Non-U.S. Locations [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Revenues | 64,213 | 57,575 | 93,833 | 88,573
UNITED STATES |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Revenues | $ 179 | $ 517 | $ 262 | $ 742

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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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