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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - STOCK BASED COMPENSATION (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Stock-Based Compensation Expense        
Stock-based compensation expense included in operating expenses $ 2,094 $ 2,127 $ 6,152 $ 6,263
Research and development        
Stock-Based Compensation Expense        
Stock-based compensation expense included in operating expenses 235 352 776 1,038
General and administrative        
Stock-Based Compensation Expense        
Stock-based compensation expense included in operating expenses $ 1,859 $ 1,775 $ 5,376 $ 5,225