Income taxes - Schedule of Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Current:
Swiss	$ 2,163	$ 469	$ 281
Non-Swiss	13,140	10,219	5,995
Total current	15,303	10,688	6,276
Deferred:
Swiss	0	0	0
Non-Swiss	0	0	0
Total deferred	0	0	0
Income tax	$ 15,303	$ 10,688	$ 6,276