Revenue - Summary of primary component of Revenue, Level of Disaggregation (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Auction Marketplace Revenue [Member]
Disaggregation Of Revenue [Line Items]
Revenue	$ 41,748	$ 40,006	$ 133,790	$ 120,863
Other Marketplace Revenue [Member]
Disaggregation Of Revenue [Line Items]
Revenue	40,484	32,145	118,276	85,317
Data Services Revenue [ Member]
Disaggregation Of Revenue [Line Items]
Revenue	8,620	7,155	24,885	15,452
Marketplace And Service Revenue [Member]
Disaggregation Of Revenue [Line Items]
Revenue	$ 90,852	$ 79,306	$ 276,951	$ 221,632