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STOCKHOLDERS' EQUITY (Details 6) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Stock-Based Compensation Expense      
Stock-based compensation expense included in operating expenses $ 4,435,000 $ 5,311,000 $ 15,249,000
Stock options
     
Stock-Based Compensation Expense      
Option vesting period 4 years    
Stock-based compensation expense related to extension of the post-termination exercise period 205,000    
Research and development
     
Stock-Based Compensation Expense      
Stock-based compensation expense included in operating expenses 1,741,000 2,336,000 5,799,000
Restructuring charges
     
Stock-Based Compensation Expense      
Stock-based compensation expense included in operating expenses 28,000 107,000 174,000
General and administrative
     
Stock-Based Compensation Expense      
Stock-based compensation expense included in operating expenses $ 2,666,000 $ 2,868,000 $ 9,276,000