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CONCENTRATION OF RISK - Revenues by Geographic Area (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Concentration Risk [Line Items] |  |  |  |
Revenues | $ 77,550 | $ 61,683 | $ 177,271 | $ 219,762
South Korea [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Revenues | 53,883 | 45,803 | 126,789 | 185,937
China [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Revenues | 17,037 | 10,234 | 34,368 | 18,130
Japan [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Revenues | 3,076 | 2,462 | 4,637 | 5,590
Other Non-U.S. Locations [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Revenues | 457 | 597 | 2,078 | 2,132
Total Non-U.S. Locations [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Revenues | 74,453 | 59,096 | 167,872 | 211,789
UNITED STATES |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Revenues | $ 3,097 | $ 2,587 | $ 9,399 | $ 7,973

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