Income taxes - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Income taxes
Income tax expense (benefit)	$ (707)	$ 100	$ (941)	$ 2,532
Effective tax rate (in percentage)	20.90%	3.24%	20.05%	20.21%