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STOCK-BASED COMPENSATION - Equity Instruments Other Than Options - Additional Information (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Fair value of shares withheld for tax withholding obligations     $ 9,330,000  
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Grants in period (shares)     39,025  
Total fair value of performance unit awards granted     $ 3,700,000  
Shares withheld for tax withholding obligations (in shares)     88,910 83,553
Fair value of shares withheld for tax withholding obligations     $ 7,700,000 $ 4,400,000
Restricted Stock [Member] | Selling, General and Administrative Expenses [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense $ 2,100,000 $ 1,900,000 6,200,000 5,300,000
Restricted Stock [Member] | Research and Development Expense [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense 402,000 376,000 1,200,000 1,400,000
Restricted Stock [Member] | Cost of Material Sales [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense 127,000 94,000 $ 317,000 352,000
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 193,000 10,000 $ 639,000 $ 174,000
Performance Shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Grants in period (shares)     15,638  
Total fair value of performance unit awards granted     $ 1,700,000  
Shares withheld for tax withholding obligations (in shares)     19,217 0
Fair value of shares withheld for tax withholding obligations     $ 1,600,000 $ 0
Performance Shares [Member] | Performance-Based Vesting Requirement [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Grants in period (shares)     7,817  
Performance Shares [Member] | Market-Based Vesting Requirement [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Grants in period (shares)     7,821  
Performance Shares [Member] | Selling, General and Administrative Expenses [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense 284,000 281,000 $ 445,000 836,000
Performance Shares [Member] | Research and Development Expense [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense 70,000 78,000 98,000 232,000
Performance Shares [Member] | Cost of Material Sales [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense $ 29,000 $ 29,000 $ 46,000 $ 85,000