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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - STOCK BASED COMPENSATION (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Stock-Based Compensation Expense    
Stock-based compensation expense included in operating expenses $ 1,983 $ 2,019
Research and development    
Stock-Based Compensation Expense    
Stock-based compensation expense included in operating expenses 291 332
General and administrative    
Stock-Based Compensation Expense    
Stock-based compensation expense included in operating expenses $ 1,692 $ 1,687