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STOCK-BASED COMPENSATION - Equity Instruments Other Than Options - Additional Information (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Compensation expense | $ 0 | $ 0 | $ 0
Fair value of shares withheld for tax withholding obligations | $ 15,980,000 | $ 11,620,000 | 9,432,000
Non Employee Members of Scientific Advisory Board [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares issued (in shares) | 1,960 | 2,456 |
Director [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Restricted stock awards and units vesting terms | 1 year |  |
Fair value of shares issued | $ 916,000,000 | $ 4,300,000 | $ 1,600,000
Shares issued (in shares) | 9,332 | 25,000 | 27,500
Restricted Stock Units (RSUs) [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Weighted average grant-date fair value of RSU awards granted (in dollars per share) | $ 168.95 | $ 115.48 | $ 116.58
Fair value as of the respective vesting dates | $ 7,700,000 | $ 8,100,000 | $ 8,300,000
Grants in period (shares) | 58,549 |  |
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 | $ 632,000 | $ 64,000 | $ 976,000
Restricted Stock [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Weighted average grant-date fair value of RSU awards granted (in dollars per share) | $ 194.19 | $ 122.15 | $ 83.25
Fair value as of the respective vesting dates | $ 28,400,000 | $ 17,700,000 | $ 14,800,000
Shares withheld for employee taxes (shares) | 86,075 | 86,679 | 89,661
Shares withheld for employee taxes | $ 14,000,000.0 | $ 9,200,000 | $ 7,800,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized | $ 30,000,000.0 |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition | 2 years 3 months |  |
Grants in period (shares) | 73,640 |  |
Unrecognized compensation expense related to performance unit awards | $ 30,000,000.0 |  |
Restricted Stock [Member] | Selling, General and Administrative Expense [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Compensation expense | 10,000,000.0 | 7,600,000 | 8,500,000
Restricted Stock [Member] | Manufacturing Expense [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Compensation expense | 1,100,000 | 758,000 | 443,000
Restricted Stock [Member] | Research and Development Expense [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Compensation expense | $ 2,500,000 | $ 2,000,000.0 | $ 1,600,000
Performance Shares [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Weighted average grant-date fair value of RSU awards granted (in dollars per share) | $ 198.72 | $ 119.62 | $ 105.65
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized | $ 2,700,000 |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition | 1 year 10 months 13 days |  |
Grants in period (shares) | 25,746 |  |
Shares withheld for tax withholding obligations (in shares) | 16,668 | 25,208 | 19,217
Fair value of shares withheld for tax withholding obligations | $ 2,600,000 | $ 2,900,000 | $ 1,600,000
Unrecognized compensation expense related to performance unit awards | $ 2,700,000 |  |
Performance Shares [Member] | Incremental Performance Based [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Grants in period (shares) | 10,096 | 40,601 | 24,664
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 | 6,022 | 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) | 5,046 | 6,025 | 7,821
Performance Shares [Member] | Company Performance-Based Vesting Requirement [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Grants in period (shares) | 15,650 | 28,554 | 9,026
Performance Shares [Member] | Selling, General and Administrative Expense [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Compensation expense | $ 1,700,000 | $ 1,300,000 | $ 1,200,000
Performance Shares [Member] | Manufacturing Expense [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Compensation expense | 208,000 | 141,000 | 119,000
Performance Shares [Member] | Research and Development Expense [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Compensation expense | $ 419,000 | $ 330,000 | $ 276,000

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