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Revenue Recognition - Summary of Revenue from Contracts with Customers by Services and Products (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Disaggregation of Revenue [Line Items]
Revenue	$ 238,696	$ 231,358	$ 697,887	$ 665,846
Marketplace
Disaggregation of Revenue [Line Items]
Revenue	231,653	204,019	665,886	586,405
Dealer-to-Dealer
Disaggregation of Revenue [Line Items]
Revenue	3,455	13,876	19,302	47,867
Instant Max Cash Offer
Disaggregation of Revenue [Line Items]
Revenue	$ 3,588	$ 13,463	$ 12,699	$ 31,574

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