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SEGMENT REPORTING (Tables)
 9 Months Ended
Sep. 30, 2025
Segment Reporting [Abstract]  
Schedule of Reconciliation of Reported Revenues to Net (Loss) Income Under Significant Expense Principle The following table reconciles reported revenues to net (loss) income under the significant expense principle for the three and nine months ended September 30, 2025 and 2024:
Three Months Ended September 30,Nine Months Ended September 30,
2025202420252024
Revenues:
    Product revenue, net$47.2 $28.2 $135.6 $29.0 
    Royalties0.1 0.1 0.3 0.5 
Total revenues$47.3 $28.3 $135.9 $29.5 
Costs and operating expenses:
Cost of goods sold1.0 0.5 3.4 0.5 
Research and development
     Research and clinical expenses18.0 17.9 51.5 55.0 
     Chemistry, manufacturing, and control expenses3.1 2.3 6.4 25.3 
Selling, general and administrative
     Commercial expenses18.6 17.4 55.0 50.0 
     Other segment expenses*
20.4 18.4 62.6 52.3 
Total costs and operating expenses
61.1 56.5 178.9 183.1 
Loss from operations(13.9)(28.2)(43.0)(153.7)
Total interest and other income (expense)(4.5)1.8 (11.6)4.5 
Net loss$(18.4)$(26.4)$(54.6)$(149.2)
    
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*Other segment expenses includes stock-based compensation expense and other general and administrative expenses largely resulting from personnel costs for individuals in administrative functions and legal and professional fees.