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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, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Concentration Risk [Line Items]        
Revenues $ 64,127 $ 49,359 $ 101,965 $ 64,335
UNITED STATES
       
Concentration Risk [Line Items]        
Revenues 164 329 330 1,084
South Korea [Member]
       
Concentration Risk [Line Items]        
Revenues 49,262 38,458 72,218 47,802
Japan [Member]
       
Concentration Risk [Line Items]        
Revenues 10,903 10,485 24,961 15,097
Other [Member]
       
Concentration Risk [Line Items]        
Revenues 3,798 87 4,456 352
All Countries [Domain]
       
Concentration Risk [Line Items]        
Revenues $ 63,963 $ 49,030 $ 101,635 $ 63,251
Geographic Concentration Risk [Member] | Total Revenue [Member]
       
Concentration Risk [Line Items]        
Concentration Risk, Percentage 100.00% 99.00% 100.00% 98.00%