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STOCK-BASED COMPENSATION - Equity Instruments Other Than Options - Additional Information (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Fair value of shares withheld for tax withholding obligations | $ 1,128,000 | $ 1,448,000 | $ 14,293,000 | $ 15,920,000
Restricted Stock [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Grants in period (shares) |  |  | 137,255 |
Total fair value of performance unit awards granted |  |  | $ 21,900,000 |
Shares withheld for tax withholding obligations (in shares) | 7,199 | 7,416 | 86,005 | 85,758
Fair value of shares withheld for tax withholding obligations | $ 1,100,000 | $ 1,400,000 | $ 12,400,000 | $ 14,000,000.0
Restricted Stock [Member] | Selling, General and Administrative Expense [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation expense | 3,400,000 | 2,200,000 | 10,400,000 | 7,100,000
Restricted Stock [Member] | Research and Development Expense [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation expense | 1,200,000 | 641,000 | 3,200,000 | 1,800,000
Restricted Stock [Member] | Cost of Sales [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation expense | 526,000 | 273,000 | $ 1,400,000 | 769,000
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 | 123,000 | 54,000 | $ 235,000 | $ 467,000
Performance Shares [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Grants in period (shares) |  |  | 95,772 |
Total fair value of performance unit awards granted |  |  | $ 16,100,000 |
Shares withheld for tax withholding obligations (in shares) |  |  | 12,877 | 16,668
Fair value of shares withheld for tax withholding obligations |  |  | $ 1,900,000 | $ 2,600,000
Performance Shares [Member] | Performance-Based Vesting Requirement [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Grants in period (shares) |  |  | 47,885 |
Performance Shares [Member] | Market-Based Vesting Requirement [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Grants in period (shares) |  |  | 47,887 |
Performance Shares [Member] | Selling, General and Administrative Expense [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation expense | 1,200,000 | 289,000 | $ 3,200,000 | 566,000
Performance Shares [Member] | Research and Development Expense [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation expense | 323,000 | 70,000 | 826,000 | 138,000
Performance Shares [Member] | Cost of Sales [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation expense | $ 196,000 | $ 34,000 | $ 491,000 | $ 64,000

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