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Royalty financing agreement - Movement in the liability (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Collaboration arrangements    
Liability owed to the Purchaser (presented as "Accrued expense and other current liabilities") $ (1,205) $ (1,437)
Interest expense for the period 12,362  
Liability related to the royalty financing agreement 405,398 394,241
Royalty financing agreement    
Collaboration arrangements    
Balance as of December 31, 2023 (includes $1.4 million presented as "Accrued expenses and other current liabilities)   $ 395,678
Royalty payments to Purchaser (1,437)  
Liability owed to the Purchaser (presented as "Accrued expense and other current liabilities") (1,205)  
Interest expense for the period 12,362  
Liability related to the royalty financing agreement $ 405,398