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STOCK-BASED COMPENSATION, Equity Instruments Other Than Options (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Restricted Stock [Member]        
Stock-based compensation, aggregate disclosures [Abstract]        
Shares withheld for tax withholding obligations (in shares)     98,635 75,594
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 Administrative Expenses [Member]        
Stock-based compensation, aggregate disclosures [Abstract]        
Compensation expense $ 1,900 $ 949 $ 4,400 2,800
Restricted Stock [Member] | Research and Development Expense [Member]        
Stock-based compensation, aggregate disclosures [Abstract]        
Compensation expense 492 421 $ 1,400 1,200
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 Administrative Expenses [Member]        
Stock-based compensation, aggregate disclosures [Abstract]        
Compensation expense 219 284 $ 723 969
Performance Shares [Member] | Research and Development Expense [Member]        
Stock-based compensation, aggregate disclosures [Abstract]        
Compensation expense 58 152 $ 200 363
Non Employee Members of Scientific Advisory Board [Member] | Restricted Stock [Member]        
Stock-based compensation, aggregate disclosures [Abstract]        
Grants in period (shares)     792,644  
Total fair value of awards granted     $ 34,300  
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     6 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 $ (51) $ 62 $ 223 $ 162