Income taxes - Reconciliation of Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Income (loss) before income taxes	$ (81,846)	$ (52,075)	$ 18,102
Swiss federal statutory rate	8.50%	8.50%	8.50%
Income tax at federal Swiss rate	$ (6,957)	$ (4,426)	$ 1,539
Foreign taxes rate differential	25,716	1,601	2,517
Change in valuation allowance	(14,238)	11,643	6,821
Effect of tax law change	5,681	0	(8,694)
Share based compensation	5,318	(4,636)	(1,615)
Research and development credits	(4,898)	(2,216)	(5,243)
Return to provision true-ups	(1,020)	2,416	0
Withholding taxes	548	273	2,366
Other	538	1,621	603
Total income tax provision	$ 10,688	$ 6,276	$ (1,706)
Effective tax rate	(13.10%)	(12.10%)	(9.40%)