Income taxes - Schedule of Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Reconciliation of uncertain tax benefits
Unrecognized tax benefits, beginning balance	$ 18	$ 76	$ 154
Additions (reductions) for taxes positions related to prior years	0	(58)	(78)
Unrecognized tax benefits, ending balance	$ 18	$ 18	$ 76