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Fair value measurement - BMS warrants - Narrative (Details)
$ in Millions
9 Months Ended
Sep. 30, 2021
USD ($)
item
Dec. 31, 2020
USD ($)
Collaboration arrangements    
Number of warrant types | item 2  
Number of Collaboration Targets | item 4  
Collaboration Agreement, Cash Payable | $ $ 70.0 $ 70.0
Non-current liabilities    
Collaboration arrangements    
Fair value of the derivative financial liability | $ $ 2.6 $ 2.6
Collaboration Agreement, If 70 Million Is Greater Than Five Percent Of Net Proceeds | Derecognition Of Warrants    
Collaboration arrangements    
Threshold Percentage Of Net Proceeds 5.0  
Percentage Of Net Proceeds Payable 5  
Collaboration Agreement, If 70 Million Is Lesser Than One Percent Of Net Proceeds | Derecognition Of Warrants    
Collaboration arrangements    
Threshold Percentage Of Net Proceeds   1
Percentage Of Net Proceeds Payable   1