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SUBSEQUENT EVENTS (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Apr. 25, 2023
Dec. 31, 2025
Dec. 31, 2024
Rolvedon | Forecast      
Subsequent Event [Line Items]      
Proceeds from sale of equity   $ 225,000 $ 175,000
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 | Assertio      
Subsequent Event [Line Items]      
Business acquisition, fixed exchange ratio $ 0.1783    
Purchase price $ 248,000    
Business acquisition, share price (in dollars per share) $ 1.14    
Subsequent Event | Spectrum Pharmaceuticals, Inc. | Spectrum Stockholders      
Subsequent Event [Line Items]      
Purchase price $ 43,000    
Business acquisition, share price (in dollars per share) $ 0.20    
Business combination, potential premium 94.00%    
Subsequent Event | Spectrum Pharmaceuticals, Inc. | Spectrum Stockholders | Assertio      
Subsequent Event [Line Items]      
Purchase price $ 291,000    
Business acquisition, share price (in dollars per share) $ 1.34    
Subsequent Event | Spectrum Pharmaceuticals, Inc. | Rolvedon      
Subsequent Event [Line Items]      
Business acquisition, share price (in dollars per share) $ 0.10    
Subsequent Event | Spectrum Pharmaceuticals, Inc.      
Subsequent Event [Line Items]      
Noncontrolling interest, ownership percentage by parent 65.00%    
Noncontrolling interest, ownership percentage by noncontrolling owners 35.00%    
Subsequent Event | Spectrum Pharmaceuticals, Inc. | Spectrum Pharmaceuticals, Inc.      
Subsequent Event [Line Items]      
Noncontrolling interest, ownership percentage by parent 65.00%