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FAIR VALUE MEASUREMENTS (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Total    
Fair value measurements    
Total assets measured at fair value $ 71,468  
Certificate of deposit | Total    
Fair value measurements    
Certificates of deposit 363  
Money market funds | Total    
Fair value measurements    
Money market funds 71,105  
Level 1    
Fair value measurements    
Total assets measured at fair value 71,105  
Level 1 | Money market funds    
Fair value measurements    
Money market funds 71,105  
Level 2    
Fair value measurements    
Total assets measured at fair value 363  
Level 2 | Certificate of deposit    
Fair value measurements    
Certificates of deposit $ 363  
Recurring basis | Total    
Fair value measurements    
Total assets measured at fair value   $ 1,856
Debt (Note 7)   38,877
Total liabilities measured at fair value   38,877
Recurring basis | Certificate of deposit | Total    
Fair value measurements    
Certificates of deposit   363
Recurring basis | Money market funds | Total    
Fair value measurements    
Money market funds   1,493
Recurring basis | Level 1    
Fair value measurements    
Total assets measured at fair value   1,493
Recurring basis | Level 1 | Money market funds    
Fair value measurements    
Money market funds   1,493
Recurring basis | Level 2    
Fair value measurements    
Total assets measured at fair value   363
Debt (Note 7)   38,877
Total liabilities measured at fair value   38,877
Recurring basis | Level 2 | Certificate of deposit    
Fair value measurements    
Certificates of deposit   $ 363