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Fair value measurement - BMS warrants - Narrative (Details)
 3 Months Ended 6 Months Ended
Jun. 30, 2021
USD ($)
item
Jun. 30, 2021
USD ($)
item
Dec. 31, 2020
USD ($)
Collaboration arrangements      
Number of warrant types | item 2 2  
Number of Collaboration Targets | item   4  
Collaboration Agreement, Cash Payable $ 70,000,000.0 $ 70,000,000.0  
Gain (Loss) from the recognition of the derivative financial liability 0 0  
Non-current liabilities      
Collaboration arrangements      
Fair value of the derivative financial liability $ 2,600,000 $ 2,600,000 $ 2,600,000
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 5.0  
Percentage Of Net Proceeds Payable 5 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 1  
Percentage Of Net Proceeds Payable 1 1