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SHAREHOLDERS' EQUITY - Deferred Compensation Arrangement (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Deferred Compensation Arrangement with Employees and Non-Employees, Share-Based Payments [Line Items]    
Fair value of shares withheld for tax withholding obligations $ 2,008  
Employees and Non Employee Members of Scientific Advisory Board [Member]    
Deferred Compensation Arrangement with Employees and Non-Employees, Share-Based Payments [Line Items]    
Shares issued (in shares) 27,967 35,205
Employees [Member]    
Deferred Compensation Arrangement with Employees and Non-Employees, Share-Based Payments [Line Items]    
Fair value of shares issued $ 1,100 $ 967
Shares withheld for tax withholding obligations (in shares) 8,106 9,565
Fair value of shares withheld for tax withholding obligations $ 410 $ 346
Non Employee Members of Scientific Advisory Board [Member]    
Deferred Compensation Arrangement with Employees and Non-Employees, Share-Based Payments [Line Items]    
Fair value of shares issued $ 300 $ 300