Income taxes (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Income taxes [Abstract]
Income tax benefit	$ 870	$ 1,355	$ 664	$ 2,225	$ 1,187
Effective tax rate	(26.80%)		(24.60%)	(24.90%)	(22.40%)
Unrecognized tax benefits that would favorably affect effective income tax rate if recognized	$ 144			$ 144
Accrued interest and penalties related to uncertain tax positions	$ 29			$ 29