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Disaggregation of revenue - Summary of Disaggregation of Revenue by Transaction Model (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Disaggregation of Revenue [Line Items]
Revenue	$ 74,573	$ 89,017	$ 270,975	$ 335,065
Open marketplace transactions
Disaggregation of Revenue [Line Items]
Revenue	73,053	86,279	263,568	324,008
Private marketplace transactions
Disaggregation of Revenue [Line Items]
Revenue	$ 1,520	$ 2,738	$ 7,407	$ 11,057

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