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FAIR VALUE MEASUREMENTS (Details 2) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Cash equivalents and marketable securities with unrealized losses    
Less Than 12 Months - Estimated Fair Value $ 41,007  
Less Than 12 Months - Gross Unrealized Losses (19)  
Total - Estimated Fair Value 41,007  
Total - Gross Unrealized Losses (19)  
Government-sponsored enterprise securities (due in less than one year)
    
Cash equivalents and marketable securities with unrealized losses    
Less Than 12 Months - Estimated Fair Value 3,947  
Less Than 12 Months - Gross Unrealized Losses (1)  
Total - Estimated Fair Value 3,947  
Total - Gross Unrealized Losses (1)  
Corporate notes (due in less than one year)
    
Cash equivalents and marketable securities with unrealized losses    
Less Than 12 Months - Estimated Fair Value 37,060 27,045
Less Than 12 Months - Gross Unrealized Losses (18) (8)
Total - Estimated Fair Value 37,060 27,045
Total - Gross Unrealized Losses $ (18) $ (8)