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STOCK-BASED COMPENSATION - Equity Instruments Other Than Options - Additional Information (Details) - USD ($)
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Fair value of shares withheld for tax withholding obligations $ 5,832,000  
Restricted Stock [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Grants in period (shares) 38,142  
Total fair value of performance unit awards granted $ 4,600,000  
Shares withheld for tax withholding obligations (in shares) 27,273 30,713
Fair value of shares withheld for tax withholding obligations $ 3,400,000 $ 2,600,000
Restricted Stock [Member] | Selling, General and Administrative Expense [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Compensation expense 1,600,000 2,000,000
Restricted Stock [Member] | Research and Development Expense [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Compensation expense 426,000 367,000
Restricted Stock [Member] | Cost of Sales [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Compensation expense $ 160,000 94,000
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 $ 157,000 $ 271,000
Performance Shares [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Grants in period (shares) 12,047  
Total fair value of performance unit awards granted $ 1,400,000  
Shares withheld for tax withholding obligations (in shares) 25,208 10,959
Fair value of shares withheld for tax withholding obligations $ 2,900,000 $ 913,000
Performance Shares [Member] | Performance-Based Vesting Requirement [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Grants in period (shares) 6,022  
Performance Shares [Member] | Market-Based Vesting Requirement [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Grants in period (shares) 6,025  
Performance Shares [Member] | Selling, General and Administrative Expense [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Compensation expense $ 425,000 440,000
Performance Shares [Member] | Research and Development Expense [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Compensation expense 105,000 115,000
Performance Shares [Member] | Cost of Sales [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Compensation expense $ 44,000 $ 45,000