Income taxes - Schedule of income before income tax (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Domestic	$ (71,537)	$ (34,829)	$ (43,544)
Foreign	(8,441)	792	(834)
Loss before income tax benefit	$ (79,978)	$ (34,037)	$ (44,378)