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STOCK-BASED COMPENSATION - Equity Instruments Other Than Options - Additional Information (Details) - USD ($)
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Fair value of shares withheld for tax withholding obligations $ 3,541,000  
Restricted Stock [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Grants in period (shares) 35,975  
Total fair value of performance unit awards granted $ 3,300,000  
Shares withheld for tax withholding obligations (in shares) 30,713 31,586
Fair value of shares withheld for tax withholding obligations $ 2,600,000 $ 1,600,000
Restricted Stock [Member] | Selling, General and Administrative Expenses [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Compensation expense 2,000,000 1,700,000
Restricted Stock [Member] | Research and Development Expense [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Compensation expense 367,000 572,000
Restricted Stock [Member] | Cost of Material Sales [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Compensation expense $ 94,000 164,000
Restricted Stock [Member] | Minimum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Restricted stock awards and units vesting terms 3 years  
Restricted Stock [Member] | Maximum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
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]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Compensation expense $ 271,000 $ 43,000
Performance Shares [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Grants in period (shares) 15,638  
Total fair value of performance unit awards granted $ 1,700,000  
Shares withheld for tax withholding obligations (in shares) 10,959 0
Fair value of shares withheld for tax withholding obligations $ 913,000 $ 0
Performance Shares [Member] | Performance-Based Vesting Requirement [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Grants in period (shares) 7,817  
Performance Shares [Member] | Market-Based Vesting Requirement [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Grants in period (shares) 7,821  
Performance Shares [Member] | Selling, General and Administrative Expenses [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Compensation expense $ 440,000 278,000
Performance Shares [Member] | Research and Development Expense [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Compensation expense 115,000 77,000
Performance Shares [Member] | Cost of Material Sales [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Compensation expense $ 45,000 $ 28,000