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SHAREHOLDERS' EQUITY - Deferred Compensation Arrangement - Additional Information (Details) - USD ($)
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Deferred Compensation Arrangement with Employees and Non-Employees, Share-Based Payments [Line Items]    
Fair value of shares withheld for tax withholding obligations $ 9,330,000  
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) 5,590 27,967
Employees [Member]    
Deferred Compensation Arrangement with Employees and Non-Employees, Share-Based Payments [Line Items]    
Fair value of shares issued $ 165,000 $ 1,100,000
Shares withheld for tax withholding obligations (in shares) 605 8,106
Fair value of shares withheld for tax withholding obligations $ 55,000 $ 410,000
Members of Scientific Advisory Board [Member]    
Deferred Compensation Arrangement with Employees and Non-Employees, Share-Based Payments [Line Items]    
Fair value of shares issued $ 300,000 $ 300,000