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STOCK-BASED COMPENSATION - Equity Instruments Other Than Options - Additional Information (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares withheld for tax withholding obligations (in shares) |  | 6,339 |  | 107,920
Fair value of shares withheld for tax withholding obligations | $ 1,448,000 | $ 567,000 | $ 15,920,000 | $ 11,598,000
Restricted Stock [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Grants in period (shares) |  |  | 51,579 |
Total fair value of performance unit awards granted |  |  | $ 8,500,000 |
Shares withheld for tax withholding obligations (in shares) | 7,416 | 6,339 | 85,758 | 86,486
Fair value of shares withheld for tax withholding obligations | $ 1,400,000 | $ 566,000 | $ 14,000,000.0 | $ 9,200,000
Restricted Stock [Member] | Selling, General and Administrative Expense [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation expense | 2,200,000 | 2,200,000 | 7,100,000 | 5,700,000
Restricted Stock [Member] | Research and Development Expense [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation expense | 641,000 | 517,000 | 1,800,000 | 1,500,000
Restricted Stock [Member] | Cost of Sales [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation expense | 273,000 | 201,000 | $ 769,000 | 548,000
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 | 54,000 | 165,000 | $ 467,000 | $ 49,000
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 | 289,000 | 352,000 | $ 566,000 | 1,300,000
Performance Shares [Member] | Research and Development Expense [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation expense | 70,000 | 86,000 | 138,000 | 319,000
Performance Shares [Member] | Cost of Sales [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation expense | $ 34,000 | $ 38,000 | $ 64,000 | $ 138,000

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