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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - STOCK BASED COMPENSATION (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Stock-Based Compensation Expense        
Stock-based compensation expense included in operating expenses $ 2,075 $ 2,117 $ 4,058 $ 4,136
Research and development        
Stock-Based Compensation Expense        
Stock-based compensation expense included in operating expenses 250 354 541 686
General and administrative        
Stock-Based Compensation Expense        
Stock-based compensation expense included in operating expenses $ 1,825 $ 1,763 $ 3,517 $ 3,450