Income taxes - Schedule of Income (Loss) Before Income Taxes, Domestic and Foreign (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Income Tax Disclosure [Abstract]
Swiss	$ (205,450)	$ (205,310)	$ (281,685)
Non-Swiss	69,200	74,148	89,945
Total income (loss) before income taxes	$ (136,250)	$ (131,162)	$ (191,740)