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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 3) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Stock-Based Compensation Expense        
Stock-based compensation expense included in operating expenses $ 2,009,000 $ 1,222,000 $ 5,752,000 $ 3,456,000
Stock-based compensation expense related to extension of the post-termination exercise period   205,000   205,000
April 2013 Restructuring
        
Stock-Based Compensation Expense        
Stock-based compensation expense related to extension of the post-termination exercise period       28,000
Research and development
        
Stock-Based Compensation Expense        
Stock-based compensation expense included in operating expenses 653,000 483,000 1,932,000 1,394,000
Restructuring charges
        
Stock-Based Compensation Expense        
Stock-based compensation expense included in operating expenses       28,000
General and administrative
        
Stock-Based Compensation Expense        
Stock-based compensation expense included in operating expenses $ 1,356,000 $ 739,000 $ 3,820,000 $ 2,034,000