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ACQUISITION–RELATED (GAINS) CHARGES, PRODUCT DISCONTINUATION AND OTHER - Narrative (Details) - USD ($) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
Nov. 19, 2021 | Dec. 31, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Business Acquisition [Line Items] |  |  |  |  |  |
Changes in contingent consideration |  |  |  |  | $ (22,351) | $ (988)
Nuance Biotech Co. Ltd. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Estimated settlement fees |  |  |  |  |  | 3,000
Flexion Acquisition |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Changes in contingent consideration | $ 45,200 | $ 1,200 | $ (12,500) |  | (13,300) |
Flexion Acquisition | Legal Fees |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquisition-related costs |  |  | 3,200 |  | 8,600 |
Myoscience Acquisition |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Changes in contingent consideration |  |  | $ (8,757) | $ 139 | $ (9,034) | $ (988)

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