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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, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Disaggregation of Revenue [Line Items]        
Revenue $ 259,133 $ 74,573 $ 564,056 $ 270,975
Open marketplace transactions        
Disaggregation of Revenue [Line Items]        
Revenue 253,016 73,053 546,949 263,568
Private marketplace transactions        
Disaggregation of Revenue [Line Items]        
Revenue $ 6,117 $ 1,520 $ 17,107 $ 7,407