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SHAREHOLDERS EQUITY (Details) - USD ($)
shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Jul. 31, 2023
Mar. 31, 2023
Jun. 30, 2023
Spectrum Pharmaceuticals, Inc.      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Issuance of common stock in connection with the Spectrum Merger, net of fractional share settlement (in shares) 38.0    
Additional Paid-In Capital      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Induced exchange of convertible notes, gross     $ 28.3
Convertible Notes      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unamortized issuance costs recognized in Additional paid-in-capital     $ 1.6
Convertible Senior Notes, 6.5% | Convertible Notes      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Proceeds from exercise of stock options   $ 10.5  
Induced exchange of convertible notes (in shares)   7.0