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STOCK-BASED COMPENSATION - Equity Instruments Other Than Options - Additional Information (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Fair value of shares withheld for tax withholding obligations $ 3,384,000 $ 8,349,000 $ 13,018,000 $ 13,165,000
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Grants in period (shares)     100,929  
Total fair value of performance unit awards granted     $ 22,900,000  
Shares withheld for tax withholding obligations (in shares) 14,660 54,332 60,827 78,806
Fair value of shares withheld for tax withholding obligations $ 3,400,000 $ 7,400,000 $ 12,100,000 $ 11,300,000
Restricted Stock [Member] | Selling, General and Administrative Expense [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense 4,100,000 3,800,000 7,700,000 7,100,000
Restricted Stock [Member] | Research and Development Expense [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense 1,300,000 1,100,000 2,500,000 2,000,000.0
Restricted Stock [Member] | Cost of Sales [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense 711,000 492,000 $ 1,300,000 892,000
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 76,000 156,000 $ 112,000 $ 112,000
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)     3,881 12,877
Fair value of shares withheld for tax withholding obligations     $ 875,000 $ 1,900,000
Performance Shares [Member] | Performance-Based Vesting Requirement [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Grants in period (shares)     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 2,200,000 1,100,000 $ 2,000,000.0 1,900,000
Performance Shares [Member] | Research and Development Expense [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense 596,000 301,000 539,000 503,000
Performance Shares [Member] | Cost of Sales [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense $ 366,000 $ 183,000 $ 332,000 $ 296,000