Income taxes - Schedule of Valuation Allowances (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Deferred Tax Assets, Valuation Allowance [Roll Forward]
Beginning at beginning of period	$ 26,339	$ 41,929	$ 43,467
Additions to valuation allowance	5,001	7,228	6,108
Reductions to valuation allowance	(6,339)	(22,818)	(7,646)
Balance at the end of the period	$ 25,001	$ 26,339	$ 41,929