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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - STOCK BASED COMPENSATION (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Stock-Based Compensation Expense        
Stock-based compensation expense included in operating expenses $ 1,615 $ 2,094 $ 4,774 $ 6,152
Research and development        
Stock-Based Compensation Expense        
Stock-based compensation expense included in operating expenses 269 235 690 776
General and administrative        
Stock-Based Compensation Expense        
Stock-based compensation expense included in operating expenses $ 1,346 $ 1,859 $ 4,084 $ 5,376