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STOCK-BASED COMPENSATION, Equity Instruments Other Than Options - Additional Information (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Stock-based compensation, aggregate disclosures [Abstract]        
Fair value of shares withheld for tax withholding obligations     $ 4,794,000  
Restricted Stock [Member]        
Stock-based compensation, aggregate disclosures [Abstract]        
Grants in period (shares)     41,543  
Total fair value of performance unit awards granted     $ 2,100,000  
Shares withheld for tax withholding obligations (in shares)     82,780 97,856
Fair value of shares withheld for tax withholding obligations     $ 4,400,000 $ 4,200,000
Restricted Stock [Member] | Selling, General and Administrative Expenses [Member]        
Stock-based compensation, aggregate disclosures [Abstract]        
Compensation expense $ 1,600,000 $ 1,600,000 3,300,000 2,500,000
Restricted Stock [Member] | Research and Development Expense [Member]        
Stock-based compensation, aggregate disclosures [Abstract]        
Compensation expense 403,000 495,000 975,000 892,000
Restricted Stock [Member] | Cost of Material Sales [Member]        
Stock-based compensation, aggregate disclosures [Abstract]        
Compensation expense 94,000 0 $ 258,000 0
Restricted Stock [Member] | Minimum [Member]        
Stock-based compensation, aggregate disclosures [Abstract]        
Restricted stock awards and units vesting terms     3 years  
Restricted Stock [Member] | Maximum [Member]        
Stock-based compensation, aggregate disclosures [Abstract]        
Restricted stock awards and units vesting terms     5 years  
Restricted Stock Units (RSUs) [Member] | Research and Development Expense [Member] | Non Employee Members of Scientific Advisory Board [Member]        
Stock-based compensation, aggregate disclosures [Abstract]        
Compensation expense 121,000 85,000 $ 164,000 $ 274,000
Performance Shares [Member]        
Stock-based compensation, aggregate disclosures [Abstract]        
Grants in period (shares)     25,045  
Total fair value of performance unit awards granted     $ 1,500,000  
Shares withheld for tax withholding obligations (in shares)     0 16,071
Fair value of shares withheld for tax withholding obligations     $ 0 $ 752,000
Performance Shares [Member] | Performance-Based Vesting Requirement [Member]        
Stock-based compensation, aggregate disclosures [Abstract]        
Grants in period (shares)     12,520  
Performance Shares [Member] | Market-Based Vesting Requirement [Member]        
Stock-based compensation, aggregate disclosures [Abstract]        
Grants in period (shares)     12,525  
Performance Shares [Member] | Selling, General and Administrative Expenses [Member]        
Stock-based compensation, aggregate disclosures [Abstract]        
Compensation expense 278,000 175,000 $ 555,000 504,000
Performance Shares [Member] | Research and Development Expense [Member]        
Stock-based compensation, aggregate disclosures [Abstract]        
Compensation expense 77,000 45,000 154,000 142,000
Performance Shares [Member] | Cost of Material Sales [Member]        
Stock-based compensation, aggregate disclosures [Abstract]        
Compensation expense $ 28,000 $ 0 $ 57,000 $ 0