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STOCK-BASED COMPENSATION, Equity Instruments Other Than Options (Details) (USD $)
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Stock-based compensation, aggregate disclosures [Abstract]    
Fair value of shares withheld for tax withholding obligations $ 2,700,000 $ 2,800,000
Restricted Stock and Units [Member]
   
Equity instruments other than options [Roll Forward]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 57,527  
Stock-based compensation, aggregate disclosures [Abstract]    
Shares withheld for tax withholding obligations (in shares) 78,924 88,063
Total fair value of performance unit awards granted 1,900,000  
Restricted Stock and Units [Member] | Minimum [Member]
   
Stock-based compensation, aggregate disclosures [Abstract]    
Restricted stock awards and units vesting terms 1 year  
Restricted Stock and Units [Member] | Maximum [Member]
   
Stock-based compensation, aggregate disclosures [Abstract]    
Restricted stock awards and units vesting terms 6 years  
Restricted Stock and Units [Member] | Selling, General and Adminstrative Expense [Member]
   
Stock-based compensation, aggregate disclosures [Abstract]    
Compensation expense 900,000 767,000
Restricted Stock and Units [Member] | Research and Development Expense [Member]
   
Stock-based compensation, aggregate disclosures [Abstract]    
Compensation expense 374,460.62 300,000
Performance Shares [Member]
   
Equity instruments other than options [Roll Forward]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 36,092  
Stock-based compensation, aggregate disclosures [Abstract]    
Total fair value of performance unit awards granted 1,200,000  
Performance Shares [Member] | Selling, General and Adminstrative Expense [Member]
   
Stock-based compensation, aggregate disclosures [Abstract]    
Compensation expense 461,000 38,000
Performance Shares [Member] | Research and Development Expense [Member]
   
Stock-based compensation, aggregate disclosures [Abstract]    
Compensation expense 173,000 11,000
Non Employee Members of Scientific Advisory Board [Member] | Restricted Stock and Units [Member] | Research and Development Expense [Member]
   
Stock-based compensation, aggregate disclosures [Abstract]    
Compensation expense $ 43,000 $ 86,000
Performance-Based Vesting Requirement [Member] | Performance Shares [Member]
   
Equity instruments other than options [Roll Forward]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 18,044  
Market-Based Vesting Requirement [Member] | Performance Shares [Member]
   
Equity instruments other than options [Roll Forward]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 18,048