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Subsequent events Narrative (Details) - Subsequent Event [Member] - USD ($)
$ in Millions
Jul. 17, 2020
Jul. 01, 2020
Subsequent Event [Line Items]    
Repayments of lines of credit   $ 18.4
Termination and exit fees   $ 0.6
Assigned royalty payment, percentage 42.933%  
Proceeds assigned royalty payment agreement $ 650.0  
Assigned royalty payment, retained percentage 57.067%  
Revenue recognition, milestone, potential achievements $ 397.5  
Royalty purchase agreement, termination period 60 days  
Royalty purchase agreement, payment maximum $ 1,300.0