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Income taxes - Changes in valuation allowance (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Opening balance $ 60,289 $ 150,113 $ 109,856
Changes recorded in the statement of operations 20,593 (88,858) 30,568
Changes recorded in equity (972)    
Increase related to 2021 and 2020 Dutch tax reforms   1,897 18,287
Valuation allowance assumed in Corlieve acquisition   545  
Other changes including currency translation adjustments (5,363) (3,408) 7,821
Ending balance 74,547 60,289 150,113
Amount of valuation allowance for deferred tax assets within contributed capital as it relates to follow on offering costs. $ 3,300 $ 4,500  
U.S. operations      
Changes recorded in the statement of operations     (16,419)
Release of valuation allowance related to expected current year and future periods recorded in profit and loss     $ (16,419)