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FAIR VALUE MEASUREMENTS - Narrative (Details) $ in Thousands	Sep. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Contingent consideration	$ 363,647	$ 2,477
Product Development and Other Milestone-based Payments | Weighted Average | Measurement Input, Probability of Success
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Contingent consideration liability, measurement input	0.905
Product Development and Other Milestone-based Payments | Weighted Average | Measurement Input, Present-value Factor
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Contingent consideration liability, measurement input	0.020
Foreign Exchange Forward
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative, notional amount	$ 29,500	22,400
Level 3 | Fair Value, Nonrecurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment owned, at fair value	22,700	$ 29,100
Thrive and Ashion | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Contingent consideration	361,300
Biomatrica, Inc | Revenue and Other Performance-based Payments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Contingent consideration	$ 2,300

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