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STOCK-BASED COMPENSATION - Equity Instruments Other Than Options - Additional Information (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Fair value of shares withheld for tax withholding obligations | $ 1,862,000 | $ 1,128,000 | $ 14,880,000 | $ 14,293,000
Restricted Stock [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Grants in period (shares) |  |  | 132,473 |
Total fair value of performance unit awards granted |  |  | $ 28,300,000 |
Shares withheld for tax withholding obligations (in shares) | 8,525 | 7,199 | 69,352 | 86,005
Fair value of shares withheld for tax withholding obligations | $ 1,900,000 | $ 1,100,000 | $ 14,000,000.0 | $ 12,400,000
Restricted Stock [Member] | Selling, General and Administrative Expense [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation expense | 3,800,000 | 3,400,000 | 11,400,000 | 10,400,000
Restricted Stock [Member] | Research and Development Expense [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation expense | 1,300,000 | 1,200,000 | 3,900,000 | 3,200,000
Restricted Stock [Member] | Cost of Sales [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation expense | 598,000 | 526,000 | $ 1,900,000 | 1,400,000
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 | 48,000 | 123,000 | $ 160,000 | $ 235,000
Performance Shares [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Grants in period (shares) |  |  | 74,086 |
Total fair value of performance unit awards granted |  |  | $ 16,500,000 |
Shares withheld for tax withholding obligations (in shares) |  |  | 3,881 | 12,877
Fair value of shares withheld for tax withholding obligations |  |  | $ 875,000 | $ 1,900,000
Performance Shares [Member] | Performance-Based Vesting Requirement [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Grants in period (shares) |  |  | 39,291 |
Performance Shares [Member] | Market-Based Vesting Requirement [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Grants in period (shares) |  |  | 34,795 |
Performance Shares [Member] | Selling, General and Administrative Expense [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation expense | 1,800,000 | 1,200,000 | $ 3,800,000 | 3,200,000
Performance Shares [Member] | Research and Development Expense [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation expense | 476,000 | 323,000 | 1,000,000.0 | 826,000
Performance Shares [Member] | Cost of Sales [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation expense | $ 292,000 | $ 196,000 | $ 624,000 | $ 491,000

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