Income taxes - Effective Tax Rate (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Effective income tax rate	(0.80%)	(0.80%)	(1.10%)	(1.00%)
Enacted tax rate	25.80%		25.80%
Income tax benefit of past share issuance cost		$ 2,977		$ 2,977
Deferred tax (benefit) expense			$ (934)	3,471
United States and France
Deferred tax (benefit) expense	$ (300)		$ 900
United States and Netherland
Deferred tax (benefit) expense		3,300		3,500
Netherland
Deferred tax (benefit) expense		$ 3,000		$ 3,000