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Income taxes - Effective Tax Rate (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Income tax expense $ (3,258) $ 0 $ (3,471) $ 0
Effective income tax rate 0.80%   1.00%  
Tax rate enacted in the Netherlands 25.00%   25.00%  
Deferred income taxes (benefits) $ 200 0 $ 500 0
Revenue 463,868 $ 1,535 464,322 $ 1,639
CSL Behring collaboration        
Revenue $ 462,400   $ 462,400