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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 3) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Stock-Based Compensation Expense        
Stock-based compensation expense included in operating expenses $ 2,376 $ 2,102 $ 4,389 $ 3,743
Research and development        
Stock-Based Compensation Expense        
Stock-based compensation expense included in operating expenses 612 690 1,234 1,279
Restructuring charges        
Stock-Based Compensation Expense        
Stock-based compensation expense included in operating expenses 212   302  
General and administrative        
Stock-Based Compensation Expense        
Stock-based compensation expense included in operating expenses $ 1,552 $ 1,412 $ 2,853 $ 2,464