CONCENTRATION OF RISK, Revenues by Geographic Area (Details) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2015 |
Sep. 30, 2014 |
Sep. 30, 2015 |
Sep. 30, 2014 |
|
| Concentration Risk [Line Items] | ||||
| Revenues | $ 39,419 | $ 32,892 | $ 128,734 | $ 134,857 |
| South Korea [Member] | ||||
| Concentration Risk [Line Items] | ||||
| Revenues | 34,536 | 22,511 | 110,600 | 94,729 |
| Japan [Member] | ||||
| Concentration Risk [Line Items] | ||||
| Revenues | 3,252 | 9,279 | 13,878 | 37,241 |
| Other [Member] | ||||
| Concentration Risk [Line Items] | ||||
| Revenues | 1,366 | 984 | 3,249 | 2,439 |
| All Countries [Domain] | ||||
| Concentration Risk [Line Items] | ||||
| Revenues | 39,154 | 32,774 | 127,727 | 134,409 |
| UNITED STATES | ||||
| Concentration Risk [Line Items] | ||||
| Revenues | $ 265 | $ 118 | $ 1,007 | $ 448 |
| Geographic Concentration Risk [Member] | Total Revenue [Member] | ||||
| Concentration Risk [Line Items] | ||||
| Concentration Risk, Percentage | 99.00% | 99.00% | 99.00% | 99.00% |