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Disaggregation of Revenue - Summary of Disaggregation of Revenue by Transaction Model (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Disaggregation of Revenue [Line Items]        
Revenue $ 103,449 $ 157,353 $ 246,048 $ 330,941
Open marketplace transactions        
Disaggregation of Revenue [Line Items]        
Revenue 99,633 152,522 237,729 321,870
Private marketplace transactions        
Disaggregation of Revenue [Line Items]        
Revenue $ 3,816 $ 4,831 $ 8,319 $ 9,071