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CONCENTRATION OF RISK - Revenues by Geographic Area (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Revenues by geographic area [Line Items] |  |  |  |
United States | $ 329 | $ 1,284 | $ 1,084 | $ 2,558
Revenue | 49,359 | 29,987 | 64,335 | 42,607
All foreign locations | 49,030 | 28,703 | 63,251 | 40,049
South Korea [Member] |  |  |  |
Revenues by geographic area [Line Items] |  |  |  |
Revenue | 38,458 | 23,560 | 47,802 | 30,953
Japan [Member] |  |  |  |
Revenues by geographic area [Line Items] |  |  |  |
Revenue | 10,485 | 4,137 | 15,097 | 6,703
Taiwan [Member] |  |  |  |
Revenues by geographic area [Line Items] |  |  |  |
Revenue | 52 | 732 | 218 | 1,989
Other foreign locations [Member] |  |  |  |
Revenues by geographic area [Line Items] |  |  |  |
Revenue | $ 35 | $ 274 | $ 134 | $ 404
Geographic Concentration Risk [Member] | Total Revenue [Member] |  |  |  |
Revenues by geographic area [Line Items] |  |  |  |
Concentration Risk, Percentage | 99.00% | 96.00% | 98.00% | 94.00%

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