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STOCK-BASED COMPENSATION - Equity Instruments Other Than Options - Additional Information (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Fair value of shares withheld for tax withholding obligations     $ 11,598,000  
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Grants in period (shares)     40,242  
Total fair value of performance unit awards granted     $ 4,900,000  
Shares withheld for tax withholding obligations (in shares) 6,339 7,567 86,486 88,910
Fair value of shares withheld for tax withholding obligations $ 566,000 $ 829,000 $ 9,200,000 $ 7,700,000
Restricted Stock [Member] | Selling, General and Administrative Expense [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense (benefit) 2,200,000 2,100,000 5,700,000 6,200,000
Restricted Stock [Member] | Research and Development Expense [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense (benefit) 517,000 402,000 1,500,000 1,200,000
Restricted Stock [Member] | Cost of Sales [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense (benefit) 201,000 127,000 $ 548,000 317,000
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) 165,000 193,000 $ 49,000 $ 639,000
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) 352,000 284,000 $ 1,300,000 445,000
Performance Shares [Member] | Research and Development Expense [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense (benefit) 86,000 70,000 319,000 98,000
Performance Shares [Member] | Cost of Sales [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense (benefit) $ 38,000 $ 29,000 $ 138,000 $ 46,000