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FAIR VALUE MEASUREMENTS (Details 4) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Liabilities    
Derivatives $ 258 $ 51
Recurring basis | Level 1
    
Assets    
Total 5,997  
Recurring basis | Level 1 | Money market funds
    
Assets    
Total 5,997  
Recurring basis | Level 2
    
Assets    
Total 56,617  
Recurring basis | Level 2 | Government-sponsored enterprise securities
    
Assets    
Total 7,320  
Recurring basis | Level 2 | Commercial paper
    
Assets    
Total 15,750  
Recurring basis | Level 2 | Corporate notes
    
Assets    
Total 33,547  
Recurring basis | Level 3
    
Liabilities    
Derivatives 258  
Recurring basis | Total
    
Assets    
Total 62,614  
Liabilities    
Derivatives 258  
Recurring basis | Total | Money market funds
    
Assets    
Total 5,997  
Recurring basis | Total | Government-sponsored enterprise securities
    
Assets    
Total 7,320  
Recurring basis | Total | Commercial paper
    
Assets    
Total 15,750  
Recurring basis | Total | Corporate notes
    
Assets    
Total $ 33,547