Income taxes - Schedule of Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Current:
Swiss	$ 469	$ 281	$ 3,105
Non-Swiss	10,219	5,995	(4,811)
Total current	10,688	6,276	(1,706)
Deferred:
Swiss	0	0	0
Non-Swiss	0	0	0
Total deferred	0	0	0
Total income tax provision	$ 10,688	$ 6,276	$ (1,706)