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 [Abstract]
Income tax benefit	$ (62)	$ (442)	$ (2,287)	$ (1,629)
Effective tax rate	(13.30%)	(96.30%)	(27.00%)	(33.60%)
Unrecognized tax benefits that would favorably affect effective income tax rate if recognized	$ 116		$ 116
Unrecognized tax benefits recognized due to expiration of statute of limitations	28
Accrued interest and penalties related to uncertain tax positions	$ 20		$ 20