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SUBSEQUENT EVENTS (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Jul. 31, 2023
Dec. 31, 2025
Dec. 31, 2024
Rolvedon | Forecast      
Subsequent Event [Line Items]      
Proceeds from sale of equity   $ 225 $ 175
Spectrum Pharmaceuticals, Inc. | Forecast      
Subsequent Event [Line Items]      
Ordinary shares issued (in shares) 38    
Spectrum Pharmaceuticals, Inc. | Rolvedon | Forecast      
Subsequent Event [Line Items]      
Business acquisition, share price (in dollars per share)     $ 0.10
Subsequent Event | Spectrum Pharmaceuticals, Inc. | Assertio Stockholders      
Subsequent Event [Line Items]      
Business acquisition, share price (in dollars per share) $ 0.20    
Subsequent Event | Assertio | Spectrum Pharmaceuticals, Inc. | Assertio Stockholders      
Subsequent Event [Line Items]      
Business acquisition, fixed exchange ratio $ 0.1783