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FAIR VALUE MEASUREMENTS - Narrative (Details) $ in Thousands | Sep. 30, 2021 USD ($) | Dec. 31, 2020 USD ($)
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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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