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FAIR VALUE MEASUREMENTS (Details 4) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Liabilities    
Derivatives   $ 16
Recurring basis | Level 1    
Assets    
Total $ 13,133 40,342
Recurring basis | Level 1 | Money market funds    
Assets    
Total 13,133 40,342
Recurring basis | Level 2    
Assets    
Total 140,948 127,577
Recurring basis | Level 2 | Government-sponsored enterprise securities    
Assets    
Total 7,322 6,949
Recurring basis | Level 2 | Commercial paper    
Assets    
Total 21,748 10,999
Recurring basis | Level 2 | Corporate notes    
Assets    
Total 111,878 109,629
Recurring basis | Level 3    
Liabilities    
Derivatives   16
Recurring basis | Total    
Assets    
Total 154,081 167,919
Liabilities    
Derivatives   16
Recurring basis | Total | Money market funds    
Assets    
Total 13,133 40,342
Recurring basis | Total | Government-sponsored enterprise securities    
Assets    
Total 7,322 6,949
Recurring basis | Total | Commercial paper    
Assets    
Total 21,748 10,999
Recurring basis | Total | Corporate notes    
Assets    
Total $ 111,878 $ 109,629