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STOCK-BASED COMPENSATION (Details 2) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Stock-based compensation expense      
Stock-based compensation $ 5,493 $ 3,964 $ 2,121
Non-cash stock-based compensation expense 5,500 4,000 2,100
Research and development
     
Stock-based compensation expense      
Non-cash stock-based compensation expense 2,396 1,685 1,087
General and administrative
     
Stock-based compensation expense      
Non-cash stock-based compensation expense 2,579 1,622 993
Sales and marketing
     
Stock-based compensation expense      
Non-cash stock-based compensation expense $ 518 $ 657 $ 41