Income taxes - Reconciliation of Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Income (loss) before income taxes	$ (191,740)	$ (81,846)	$ (52,075)
Swiss federal statutory rate	8.50%	8.50%	8.50%
Income tax at federal Swiss rate	$ (16,298)	$ (6,957)	$ (4,426)
Change in valuation allowance	13,427	(14,238)	11,643
Foreign taxes rate differential	10,620	25,716	1,601
Return to provision true-ups	10,854	(1,020)	2,416
Research and development credits	(6,483)	(4,898)	(2,216)
Share based compensation	2,332	5,318	(4,636)
Withholding Taxes	435	548	273
Effect of tax law change	6	5,681	0
Other	410	538	1,621
Income tax	$ 15,303	$ 10,688	$ 6,276
Effective tax rate	(8.00%)	(13.10%)	(12.10%)