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FAIR VALUE MEASUREMENT AND FINANCIAL INSTRUMENTS - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended				12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Fair Value, Option, Quantitative Disclosures [Line Items]
Contingent consideration liability, measurement input	0.080	0.075	0.066	0.074	0.080	0.084
License agreement, royalty rate	2.00%				2.00%
Change in fair value of contingent consideration	$ (4,600)	$ (114,000)	$ 13,600	$ 48,160	$ (56,840)	$ (11,180)	$ 71,620
Minimum
Fair Value, Option, Quantitative Disclosures [Line Items]
Probability of achieving clinical and regulatory milestones	45.00%				45.00%
Maximum
Fair Value, Option, Quantitative Disclosures [Line Items]
Probability of achieving clinical and regulatory milestones	55.00%				55.00%
Discount Rate
Fair Value, Option, Quantitative Disclosures [Line Items]
Weighted-average cost of capital	9.30%	8.60%	6.80%	7.80%	9.30%	8.80%
Discount Rate | Minimum
Fair Value, Option, Quantitative Disclosures [Line Items]
Contingent consideration liability, measurement input	0.080				0.080	0.084
Discount Rate | Maximum
Fair Value, Option, Quantitative Disclosures [Line Items]
Contingent consideration liability, measurement input	0.093				0.093	0.088

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Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 4
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=120321790&loc=d3e7008-128479

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Value of input used to measure contingent consideration liability from business combination.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
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