Income taxes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Income taxes
Income Tax Expense (Benefit)	$ 72	$ 33	$ 10	$ 32
Effective Income Tax Rate Reconciliation, Percent	(0.21%)	0.01%		(0.09%)