Income taxes - Schedule of Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning Balance	$ 212	$ 1,079	$ 1,079
Additions for tax positions of prior years	343	212	0
Lapse in statute of limitations	0	0	0
Settlements with taxing authorities	(212)	(1,079)	0
Ending Balance	$ 343	$ 212	$ 1,079