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STOCK-BASED COMPENSATION - Equity Instruments Other Than Options - Additional Information (Details) - USD ($)
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Fair value of shares withheld for tax withholding obligations $ 4,816,000 $ 5,757,000
Restricted Stock [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Grants in period (shares) 125,040  
Total fair value of performance unit awards granted $ 19,500,000  
Shares withheld for tax withholding obligations (in shares) 24,474 25,731
Fair value of shares withheld for tax withholding obligations $ 3,900,000 $ 3,800,000
Restricted Stock [Member] | Selling, General and Administrative Expense [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Compensation expense 3,300,000 2,400,000
Restricted Stock [Member] | Research and Development Expense [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Compensation expense 877,000 546,000
Restricted Stock [Member] | Cost of Sales [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Compensation expense $ 400,000 227,000
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 $ 43,000 $ 282,000
Performance Shares [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Grants in period (shares) 95,772  
Total fair value of performance unit awards granted $ 16,100,000  
Shares withheld for tax withholding obligations (in shares) 5,963 16,668
Fair value of shares withheld for tax withholding obligations $ 930,000 $ 2,600,000
Performance Shares [Member] | Performance-Based Vesting Requirement [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Grants in period (shares) 47,885  
Performance Shares [Member] | Market-Based Vesting Requirement [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Grants in period (shares) 47,887  
Performance Shares [Member] | Selling, General and Administrative Expense [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Compensation expense $ 811,000 266,000
Performance Shares [Member] | Research and Development Expense [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Compensation expense 202,000 65,000
Performance Shares [Member] | Cost of Sales [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Compensation expense $ 113,000 $ 29,000