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Commitments and contingencies - License agreements and Lease commitments (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Other licenses        
License agreements        
Royalty expense $ 0.0   $ 0.0  
Other licenses | Maximum        
License agreements        
Royalty expense   $ 0.1   $ 0.1
Tufts | License agreements        
License agreements        
Royalty expense $ 0.2 $ 0.2 $ 0.4 $ 0.4