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Revenue Recognition - Summary of Revenue from Contracts with Customers by Services and Products (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Disaggregation of Revenue [Line Items]
Revenue	$ 234,033	$ 218,692	$ 459,191	$ 434,488
Marketplace
Disaggregation of Revenue [Line Items]
Revenue	221,998	195,167	434,233	382,386
Dealer-to-Dealer
Disaggregation of Revenue [Line Items]
Revenue	7,682	15,492	15,847	33,991
Sell My Car - Instant Max Cash Offer
Disaggregation of Revenue [Line Items]
Revenue	$ 4,353	$ 8,033	$ 9,111	$ 18,111

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