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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

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