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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - STOCK BASED COMPENSATION (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Stock-Based Compensation Expense        
Stock-based compensation expense included in operating expenses $ 2,127 $ 2,064 $ 6,263 $ 6,453
Research and development        
Stock-Based Compensation Expense        
Stock-based compensation expense included in operating expenses 352 462 1,038 1,696
Restructuring charges        
Stock-Based Compensation Expense        
Stock-based compensation expense included in operating expenses   5   307
General and administrative        
Stock-Based Compensation Expense        
Stock-based compensation expense included in operating expenses $ 1,775 $ 1,597 $ 5,225 $ 4,450