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STOCK-BASED COMPENSATION, Equity Instruments Other Than Options (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Restricted Stock [Member]        
Stock-based compensation, aggregate disclosures [Abstract]        
Shares withheld for tax withholding obligations (in shares)     97,856 75,314
Fair value of shares withheld for tax withholding obligations     $ 4,200 $ 2,600
Restricted Stock [Member] | Minimum [Member]        
Stock-based compensation, aggregate disclosures [Abstract]        
Restricted stock awards and units vesting terms     1 year  
Restricted Stock [Member] | Maximum [Member]        
Stock-based compensation, aggregate disclosures [Abstract]        
Restricted stock awards and units vesting terms     6 years  
Restricted Stock [Member] | Selling, General and Adminstrative Expense [Member]        
Stock-based compensation, aggregate disclosures [Abstract]        
Compensation expense $ 1,586 $ 914 $ 2,500 1,800
Restricted Stock [Member] | Research and Development Expense [Member]        
Stock-based compensation, aggregate disclosures [Abstract]        
Compensation expense 495 409 $ 892 783
Performance Shares [Member]        
Stock-based compensation, aggregate disclosures [Abstract]        
Grants in period (shares)     32,632  
Total fair value of awards granted     $ 1,500  
Shares withheld for tax withholding obligations (in shares)     16,071  
Fair value of shares withheld for tax withholding obligations     $ 752  
Performance Shares [Member] | Performance-Based Vesting Requirement [Member]        
Stock-based compensation, aggregate disclosures [Abstract]        
Grants in period (shares)     16,315  
Performance Shares [Member] | Market-Based Vesting Requirement [Member]        
Stock-based compensation, aggregate disclosures [Abstract]        
Grants in period (shares)     16,317  
Performance Shares [Member] | Selling, General and Adminstrative Expense [Member]        
Stock-based compensation, aggregate disclosures [Abstract]        
Compensation expense 175 198 $ 504 685
Performance Shares [Member] | Research and Development Expense [Member]        
Stock-based compensation, aggregate disclosures [Abstract]        
Compensation expense 45 60 $ 142 207
Non Employee Members of Scientific Advisory Board [Member] | Restricted Stock [Member]        
Stock-based compensation, aggregate disclosures [Abstract]        
Grants in period (shares)     554,244  
Total fair value of awards granted     $ 25,200  
Non Employee Members of Scientific Advisory Board [Member] | Restricted Stock [Member] | Minimum [Member]        
Stock-based compensation, aggregate disclosures [Abstract]        
Restricted stock awards and units vesting terms     3 years  
Non Employee Members of Scientific Advisory Board [Member] | Restricted Stock [Member] | Maximum [Member]        
Stock-based compensation, aggregate disclosures [Abstract]        
Restricted stock awards and units vesting terms     5 years  
Non Employee Members of Scientific Advisory Board [Member] | Restricted Stock [Member] | Research and Development Expense [Member]        
Stock-based compensation, aggregate disclosures [Abstract]        
Compensation expense $ 85 $ 57 $ 274 $ 100