STOCK-BASED COMPENSATION - Equity Instruments Other Than Options - Additional Information (Details) - USD ($)	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of shares withheld for tax withholding obligations	$ 14,394,000	$ 15,980,000	$ 11,620,000
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	$ 1,300	$ 916,000,000,000	$ 4,300,000
Shares issued (in shares)	6,456	9,332	25,000
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)	$ 162.32	$ 168.95	$ 115.48
Fair value as of the respective vesting dates	$ 7,700,000	$ 7,700,000	$ 8,100,000
Grants in period (shares)	143,179
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	$ 380,000	$ 632,000	$ 64,000
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)	$ 155.85	$ 194.19	$ 122.15
Fair value as of the respective vesting dates	$ 24,500,000	$ 28,400,000	$ 17,700,000
Shares withheld for employee taxes (shares)	86,442	86,075	86,679
Shares withheld for employee taxes	$ 12,500,000	$ 14,000,000.0	$ 9,200,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	$ 31,700,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	1 year 10 months 20 days
Grants in period (shares)	1,926
Unrecognized compensation expense related to performance unit awards	$ 31,700,000
Restricted Stock [Member] \| Selling, General and Administrative Expense [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	13,900,000	10,000,000.0	7,600,000
Restricted Stock [Member] \| Manufacturing Expense [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	1,900,000	1.1	758,000
Restricted Stock [Member] \| Research and Development Expense [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 4,300,000	$ 2,500,000	$ 2,000,000.0
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)	$ 167.74	$ 198.72	$ 119.62
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	$ 12,900,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	2 years 1 month 13 days
Grants in period (shares)	111,410
Shares withheld for tax withholding obligations (in shares)	12,877	16,668	25,208
Fair value of shares withheld for tax withholding obligations	$ 1,900,000	$ 2,600,000	$ 2,900,000
Unrecognized compensation expense related to performance unit awards	$ 12,900,000
Performance Shares [Member] \| Incremental Performance Based [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants in period (shares)	95,772	10,096	40,601
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	5,050	6,022
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	5,046	6,025
Performance Shares [Member] \| Company Performance-Based Vesting Requirement [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants in period (shares)	15,638	15,650	28,554
Performance Shares [Member] \| Selling, General and Administrative Expense [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 4,300,000	$ 1,700,000	$ 1,300,000
Performance Shares [Member] \| Manufacturing Expense [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	670,000	208,000	141,000
Performance Shares [Member] \| Research and Development Expense [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 1.1	$ 419,000	$ 330,000

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