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Other income (expense) - Narrative (Details) - USD ($)
$ in Millions
Aug. 15, 2022
Sep. 30, 2023
May 19, 2020
Apr. 24, 2020
Disclosure of detailed information about borrowings [line items]        
Exchange Of Convertible Notes For Warrants $ 115.0      
Convertible Notes, Value Converted $ 117.3      
Warrants, Tranche One        
Disclosure of detailed information about borrowings [line items]        
Convertible Notes, Shares Converted 4,412,840      
Facility Agreement With Deerfield Partners, L.P., Tranche One        
Disclosure of detailed information about borrowings [line items]        
Borrowings     $ 65.0 $ 65.0
Facility Agreement With Deerfield Partners, L.P., Tranche Two        
Disclosure of detailed information about borrowings [line items]        
Borrowings       50.0
Borrowings, maximum borrowing capacity       50.0
Facility Agreement with Deerfield Partners, L.P.        
Disclosure of detailed information about borrowings [line items]        
Borrowings   $ 120.0    
Borrowings, maximum borrowing capacity       $ 115.0