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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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