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CONCENTRATION OF RISK - Revenues by Geographic Area (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Revenues by geographic area [Line Items]    
United States $ 755 $ 1,274
Revenue 14,976 12,620
All foreign locations 14,221 11,346
South Korea [Member]
   
Revenues by geographic area [Line Items]    
Revenue 9,344 7,393
Japan [Member]
   
Revenues by geographic area [Line Items]    
Revenue 4,612 2,566
Taiwan [Member]
   
Revenues by geographic area [Line Items]    
Revenue 166 1,257
Other foreign locations [Member]
   
Revenues by geographic area [Line Items]    
Revenue $ 99 $ 130