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STOCK-BASED COMPENSATION - Equity Instruments Other Than Options - Additional Information (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Fair value of shares withheld for tax withholding obligations $ 8,715,000 $ 5,199,000 $ 14,472,000 $ 11,031,000
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Grants in period (shares)     51,079  
Total fair value of performance unit awards granted     $ 8,400,000  
Shares withheld for tax withholding obligations (in shares) 52,611 52,874 78,342 80,147
Fair value of shares withheld for tax withholding obligations $ 8,700,000 $ 5,200,000 $ 12,500,000 $ 8,600,000
Restricted Stock [Member] | Selling, General and Administrative Expense [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense 2,500,000 1,900,000 4,900,000 3,500,000
Restricted Stock [Member] | Research and Development Expense [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense 631,000 509,000 1,200,000 934,000
Restricted Stock [Member] | Cost of Sales [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense 269,000 186,000 $ 496,000 347,000
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 131,000 41,000 $ 413,000 $ 116,000
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     $ 2,000,000.0  
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)     5,050  
Performance Shares [Member] | Market-Based Vesting Requirement [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Grants in period (shares)     5,046  
Performance Shares [Member] | Selling, General and Administrative Expense [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense 11,000 519,000 $ 277,000 945,000
Performance Shares [Member] | Research and Development Expense [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense 3,000 128,000 68,000 232,000
Performance Shares [Member] | Cost of Sales [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense $ 0 $ 56,000 $ 30,000 $ 100,000