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Revenue - Summary of primary component of Revenue, Level of Disaggregation (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Auction Marketplace Revenue [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue $ 40,006 $ 32,776 $ 120,863 $ 74,139
Transportation Data And Other Services Revenue [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue 39,300 23,591 100,769 55,134
Marketplace And Service Revenue [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue $ 79,306 $ 56,367 $ 221,632 $ 129,273