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Subsequent events (Details) - USD ($)
$ in Millions
Feb. 23, 2026
Feb. 18, 2026
Feb. 26, 2026
Dec. 31, 2025
Oct. 10, 2025
Subsequent events | Four20 Pharma GmbH          
Subsequent Events          
Percentage of ownership after transaction 100.00%        
Rejection period 20 days        
Subsequent events | Four20 Pharma GmbH | Four20 Pharma GmbH Sellers          
Subsequent Events          
Percentage of ownership before transaction 45.00%        
Senior Secured Notes - 2029 | Line of credit | Subsequent events          
Subsequent Events          
Gross proceeds   $ 500.0      
Debt issuance costs   $ 7.9      
Stated interest rate   11.50%      
Amended Needham LOC | Line of credit          
Subsequent Events          
Stated interest rate       7.99%  
Amended Needham LOC | Line of credit | Revolving credit facility          
Subsequent Events          
Stated interest rate         7.99%
Amended Needham LOC | Line of credit | Subsequent events | Revolving credit facility          
Subsequent Events          
Stated interest rate     8.99%