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STOCK-BASED COMPENSATION - Equity Instruments Other Than Options - Additional Information (Details) - USD ($)
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Fair value of shares withheld for tax withholding obligations $ 9,634,000 $ 4,816,000
Restricted Stock [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Grants in period (shares) 100,079  
Total fair value of performance unit awards granted $ 22,700,000  
Shares withheld for tax withholding obligations (in shares) 48,824 24,474
Fair value of shares withheld for tax withholding obligations $ 9,400,000 $ 3,900,000
Restricted Stock [Member] | Selling, General and Administrative Expense [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Compensation expense 3,600,000 3,300,000
Restricted Stock [Member] | Research and Development Expense [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Compensation expense 1,200,000 877,000
Restricted Stock [Member] | Cost of Sales [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Compensation expense $ 557,000 400,000
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 $ 36,000 $ 43,000
Performance Shares [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Grants in period (shares) 69,586  
Total fair value of performance unit awards granted $ 15,800,000  
Shares withheld for tax withholding obligations (in shares) 1,224 5,963
Fair value of shares withheld for tax withholding obligations $ 231,000 $ 930,000
Performance Shares [Member] | Performance-Based Vesting Requirement [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Grants in period (shares) 34,791  
Performance Shares [Member] | Market-Based Vesting Requirement [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Grants in period (shares) 34,795  
Performance Shares [Member] | Selling, General and Administrative Expense [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Compensation expense $ 211,000 811,000
Performance Shares [Member] | Research and Development Expense [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Compensation expense 56,000 202,000
Performance Shares [Member] | Cost of Sales [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Compensation expense $ 35,000 $ 113,000