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STOCK-BASED COMPENSATION - Equity Instruments Other Than Options - Additional Information (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Fair value of shares withheld for tax withholding obligations     $ 11,031,000  
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Grants in period (shares)     38,442  
Total fair value of performance unit awards granted     $ 4,700,000  
Shares withheld for tax withholding obligations (in shares) 52,874 50,630 80,147 81,343
Fair value of shares withheld for tax withholding obligations $ 5,200,000 $ 4,300,000 $ 8,600,000 $ 6,800,000
Restricted Stock [Member] | Selling, General and Administrative Expense [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense (benefit) 1,900,000 2,100,000 3,500,000 4,100,000
Restricted Stock [Member] | Research and Development Expense [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense (benefit) 509,000 419,000 934,000 786,000
Restricted Stock [Member] | Cost of Sales [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense (benefit) 186,000 96,000 $ 347,000 190,000
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 (benefit) 41,000 175,000 $ (116,000) $ 445,000
Performance Shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Grants in period (shares)     12,047  
Total fair value of performance unit awards granted     $ 1,400,000  
Shares withheld for tax withholding obligations (in shares)     25,208 19,217
Fair value of shares withheld for tax withholding obligations     $ 2,900,000 $ 1,600,000
Performance Shares [Member] | Performance-Based Vesting Requirement [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Grants in period (shares)     6,022  
Performance Shares [Member] | Market-Based Vesting Requirement [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Grants in period (shares)     6,025  
Performance Shares [Member] | Selling, General and Administrative Expense [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense (benefit) 519,000 (279,000) $ 945,000 161,000
Performance Shares [Member] | Research and Development Expense [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense (benefit) 128,000 (87,000) 232,000 28,000
Performance Shares [Member] | Cost of Sales [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense (benefit) $ 56,000 $ (29,000) $ 100,000 $ 16,000