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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 3) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Stock-Based Compensation        
Stock-based compensation expense included in operating expenses $ 1,222,000 $ 1,263,000 $ 3,456,000 $ 4,016,000
Stock options | Certain members of executive management team
       
Stock-Based Compensation        
Modifications to the Post-termination exercise period 205,000   205,000  
Research and development
       
Stock-Based Compensation        
Stock-based compensation expense included in operating expenses 483,000 594,000 1,394,000 1,861,000
Restructuring charges
       
Stock-Based Compensation        
Stock-based compensation expense included in operating expenses     28,000  
General and administrative
       
Stock-Based Compensation        
Stock-based compensation expense included in operating expenses $ 739,000 $ 669,000 $ 2,034,000 $ 2,155,000