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ACQUISITION-RELATED (GAINS) CHARGES, RESTRUCTURING CHARGES AND OTHER - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Business Acquisition [Line Items] |  |  |  |
Changes in contingent consideration |  |  | $ (6,640) | $ (22,351)
Restructuring charges | $ 936 | $ 0 | 936 | 0
One-time Termination Benefits |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Restructuring charges | 900 |  | 900 |
Restructuring and related cost paid |  |  | 400 |
Restructuring and related cost to be paid | 500 |  | 500 |
Flexion Acquisition |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Changes in contingent consideration | 18,300 | 12,500 | 6,600 | 13,300
Flexion Acquisition | Legal Fees |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Acquisition-related costs | 700 | 3,200 | 1,200 | 8,600
Flexion |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Changes in contingent consideration | 18,258 | 12,523 | 6,640 | 13,317
Myoscience Acquisition |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Changes in contingent consideration | $ 0 | $ 8,757 | $ 0 | $ 9,034

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