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STOCK-BASED COMPENSATION - Equity Instruments Other Than Options - Additional Information (Details) - USD ($)
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Fair value of shares withheld for tax withholding obligations $ 5,757,000 $ 5,832,000
Restricted Stock [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Grants in period (shares) 32,041  
Total fair value of performance unit awards granted $ 4,900,000  
Shares withheld for tax withholding obligations (in shares) 25,731 27,273
Fair value of shares withheld for tax withholding obligations $ 3,800,000 $ 3,400,000
Restricted Stock [Member] | Selling, General and Administrative Expense [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Compensation expense 2,400,000 1,600,000
Restricted Stock [Member] | Research and Development Expense [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Compensation expense 546,000 426,000
Restricted Stock [Member] | Cost of Sales [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Compensation expense $ 227,000 160,000
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 $ 282,000 $ 157,000
Performance Shares [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Grants in period (shares) 10,096  
Total fair value of performance unit awards granted $ 2,000,000  
Shares withheld for tax withholding obligations (in shares) 16,668 25,208
Fair value of shares withheld for tax withholding obligations $ 2,600,000 $ 2,900,000
Performance Shares [Member] | Performance-Based Vesting Requirement [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Grants in period (shares) 5,046  
Performance Shares [Member] | Market-Based Vesting Requirement [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Grants in period (shares) 5,050  
Performance Shares [Member] | Selling, General and Administrative Expense [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Compensation expense $ 266,000 425,000
Performance Shares [Member] | Research and Development Expense [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Compensation expense 65,000 105,000
Performance Shares [Member] | Cost of Sales [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Compensation expense $ 29,000 $ 44,000