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ACQUISITIONS - Acquisition Date Fair Value of Consideration Transferred (Details) - Spectrum Pharmaceuticals, Inc. - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | Jul. 31, 2023 | Sep. 30, 2023
--- | --- | ---
Business Acquisition [Line Items] |  |
Assertio shares issued (in shares) | 38,013 |
Assertio closing price per share as of the Effective Date (in dollars per share) | $ 5.69 |
Fair value of Assertio shares issued | $ 216,294 |
Repayment of Spectrum's long-term debt | 32,647 |
CVRs | 3,932 | $ 0
Consideration transferred | $ 252,873 |

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