Revenue - Summary of primary component of Revenue, Level of Disaggregation (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Auction Marketplace Revenue [Member]
Disaggregation Of Revenue [Line Items]
Revenue	$ 43,960	$ 34,257
Other Marketplace Revenue [Member]
Disaggregation Of Revenue [Line Items]
Revenue	36,340	19,464
Data Services Revenue [ Member]
Disaggregation Of Revenue [Line Items]
Revenue	8,047	4,672
Marketplace And Service Revenue [Member]
Disaggregation Of Revenue [Line Items]
Revenue	$ 88,347	$ 58,392