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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