Summary of Significant Accounting Policies (Policies)	3 Months Ended
Mar. 31, 2025
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying interim condensed consolidated financial statements are unaudited (the “Unaudited Condensed Consolidated Financial Statements”). The Unaudited Condensed Consolidated Financial Statements and related disclosures have been prepared in conformity with accounting principles generally accepted in the U.S. (“GAAP”). Any reference in these notes to applicable guidance is meant to refer to GAAP as found in the Accounting Standards Codification (“ASC”) and Accounting Standards Update (“ASU”) of the Financial Accounting Standards Board (“FASB”). The Unaudited Condensed Consolidated Financial Statements have also been prepared pursuant to the rules and regulations of the U.S. Securities and Exchange Commission (“SEC”). Accordingly, certain information and footnote disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations. The Unaudited Condensed Consolidated Financial Statements reflect all adjustments, consisting of only normal recurring adjustments, necessary for the fair presentation of the Company’s financial statements for interim periods. These interim period results are not necessarily indicative of the results to be expected for any other interim period or the full year. The Unaudited Condensed Consolidated Financial Statements should be read in conjunction with the Company’s audited consolidated financial statements and the notes thereto included in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2024, filed with the SEC on February 20, 2025 (the “Annual Report”).
Principles of Consolidation	Principles of Consolidation The Unaudited Condensed Consolidated Financial Statements include the accounts of the Company and its subsidiaries. All intercompany balances and transactions have been eliminated in consolidation.
Subsequent Event Considerations	Subsequent Event Considerations The Company considers events or transactions that occur after the balance sheet date but prior to the issuance of the Unaudited Condensed Consolidated Financial Statements to provide additional evidence for certain estimates or to identify matters that require additional disclosure. The Company has evaluated all subsequent events and determined that there are no material recognized or unrecognized subsequent events requiring disclosure.
Use of Estimates	Use of Estimates The preparation of the Unaudited Condensed Consolidated Financial Statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenue and expense during the reporting period. Although the Company regularly assesses these estimates, actual results could differ materially from these estimates. The Company bases its estimates on historical experience and various other assumptions that it believes to be reasonable under the circumstances. Actual results may differ from management’s estimates if these results differ from historical experience, or other assumptions do not turn out to be substantially accurate, even if such assumptions are reasonable when made. Changes in estimates are recognized in the period in which they become known. Critical estimates relied upon in preparing the Unaudited Condensed Consolidated Financial Statements include the determination of sales allowance and variable consideration in the Company’s revenue recognition, the impairment and useful lives of long-lived assets, the capitalization and useful lives of product, technology, and development costs for website development, internal-use software, and hosting arrangements, and the valuation and recoverability of intangible assets and goodwill. Accordingly, the Company considers these to be its critical accounting estimates, and believes that of the Company’s significant accounting policies, these involve the greatest degree of judgment and complexity. Due to the partial impairment of the CarOffer reporting unit goodwill and other long-lived assets during the year ended December 31, 2024, in which the CarOffer reporting unit was reduced to its fair value, there remains a risk for future impairment charges if projected future operating results further decline, including as a result of economic conditions or operational challenges, which could be material and negatively affect its operations.
Concentration of Credit Risk	Concentration of Credit Risk The Company has no significant off-balance sheet risk, such as foreign exchange contracts, option contracts, or other foreign hedging arrangements. Financial instruments that potentially expose the Company to concentrations of credit risk consist primarily of cash, cash equivalents, trade accounts receivable, and other receivables. The Company maintains its cash and cash equivalents, principally with accredited financial institutions of high credit standing. Although the Company deposits its cash and cash equivalents with multiple financial institutions, its deposits with each such financial institution exceed governmental insured limits. The Company routinely assesses the creditworthiness of its customers and does not require collateral. The Company generally has not experienced any material losses related to receivables from individual customers or groups of customers. The Company had no material losses related to marketplace receivables as the losses were dispersed across a large number of customers. The Company had no material losses related to wholesale and product receivables as the third-party transaction processor does not release the title to the vehicle until successfully collecting funds from the buying dealer. Titling is handled by the Company’s third-party transaction processor and titles are held in escrow until it collects funds from the buying dealer (i.e., title is legally transferred from the selling party to the buying party upon signing of bill of sale, but title is held in escrow by the third-party transaction processor until payment is received). Due to these factors, no additional credit risk beyond amounts provided for collection losses was believed by management to be probable in the Company’s accounts receivable and other receivables. As of March 31, 2025, a payment processor for several hundred dealer accounts represented 10.6% of net accounts receivable and other receivables. The related accounts receivable balance included unbilled and billed receivables that are not past due. The concentration was driven by the timing of payments pursuant to the agreement with the payment processor, as well as a decrease in the total accounts receivable, net balance as of March 31, 2025. The remainder of the accounts receivable was dispersed among more than 1,000 customers. Therefore, the Company does not believe there is significant credit risk with respect to accounts receivable. As of December 31, 2024, there was no concentration in excess of 10% of net accounts receivable and other receivables. For the three months ended March 31, 2025 and 2024, no customer accounted for more than 10% of total revenue. As of March 31, 2025 and December 31, 2024, $13,663 and $13,213, respectively, was included in accounts receivable, net representing unbilled accounts receivable relating primarily to both advertising customers and dealers invoiced in the period subsequent to services rendered and revenue recognition adjustments for Company offered discounts given to dealers in accordance with ASC Topic 606, Revenue from Contracts with Customers (“ASC 606”).
Significant Accounting Policies	Significant Accounting Policies The Unaudited Condensed Consolidated Financial Statements reflect the application of certain significant accounting policies as described below and elsewhere in these notes to the Unaudited Condensed Consolidated Financial Statements. As of March 31, 2025, there have been no material changes in the Company’s significant accounting policies, which are detailed in the Annual Report.
Recent Accounting Pronouncements Not Yet Adopted	Recent Accounting Pronouncements Not Yet Adopted From time to time, new accounting pronouncements are issued by the FASB or other standard-setting bodies and adopted by the Company on or prior to the specified effective date. Unless otherwise disclosed below, the Company believes that the impact of recently issued standards that are not yet effective will not have a material impact on its financial position or results of operations upon adoption. As of March 31, 2025, there are no new accounting pronouncements that the Company is considering adopting, other than those described below. In November 2024 the FASB issued ASU 2024-03, Income Statement-Reporting Comprehensive Income-Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses (“ASU 2024-03”). ASU 2024-03 is intended to provide more detailed expense information and requires additional disaggregated disclosures in the notes to the financial statements for categories of expenses that are included on the face of the income statement. ASU 2024-03 is effective for the fiscal years beginning after December 15, 2026, and interim periods within fiscal years beginning after December 15, 2027. Early adoption is permitted. ASU 2024-03 may be applied either prospectively to financial statements issued for periods after the effective date of ASU 2024-03 or retrospectively to all prior periods presented in the consolidated financial statements. The Company is currently evaluating the impact of ASU 2024-03 on its future consolidated financial statements and related disclosures. In December 2023 the FASB issued ASU 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures (“ASU 2023-09”). ASU 2023-09 is intended to enhance the transparency and decision usefulness of income tax disclosures. ASU 2023-09 addresses investor requests for enhanced income tax information primarily through changes to the rate reconciliation and income taxes paid information. Early adoption is permitted. A public entity should apply ASU 2023-09 prospectively to all annual periods beginning after December 15, 2024. The Company is currently evaluating the impact of ASU 2023-09 on its future consolidated financial statements and related disclosures.
Earnings Per Share	The Company has two classes of common stock authorized: Class A common stock and Class B common stock. The rights of the holders of Class A and Class B common stock are identical, except with respect to voting and conversion. Each share of Class A common stock is entitled to one vote per share and each share of Class B common stock is entitled to ten votes per share. Each share of Class B common stock is convertible into one share of Class A common stock at the option of the holder at any time or automatically upon certain events described in the Company’s fourth amended and restated certificate of incorporation, including upon either the death or voluntary termination of the Company’s Executive Chair. The Company allocates undistributed earnings attributable to common stock between the common stock classes on a one‑to‑one basis when computing net income per share. As a result, basic and diluted net income per share of Class A common stock and per share of Class B common stock are equivalent.

Summary of Significant Accounting Policies (Policies)

3 Months Ended

Mar. 31, 2025

The accompanying interim condensed consolidated financial statements are unaudited (the “Unaudited Condensed Consolidated Financial Statements”). The Unaudited Condensed Consolidated Financial Statements and related disclosures have been prepared in conformity with accounting principles generally accepted in the U.S. (“GAAP”). Any reference in these notes to applicable guidance is meant to refer to GAAP as found in the Accounting Standards Codification (“ASC”) and Accounting Standards Update (“ASU”) of the Financial Accounting Standards Board (“FASB”).

The Unaudited Condensed Consolidated Financial Statements have also been prepared pursuant to the rules and regulations of the U.S. Securities and Exchange Commission (“SEC”). Accordingly, certain information and footnote disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations. The Unaudited Condensed Consolidated Financial Statements reflect all adjustments, consisting of only normal recurring adjustments, necessary for the fair presentation of the Company’s financial statements for interim periods. These interim period results are not necessarily indicative of the results to be expected for any other interim period or the full year.

The Unaudited Condensed Consolidated Financial Statements should be read in conjunction with the Company’s audited consolidated financial statements and the notes thereto included in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2024, filed with the SEC on February 20, 2025 (the “Annual Report”).

Principles of Consolidation

The Unaudited Condensed Consolidated Financial Statements include the accounts of the Company and its subsidiaries. All intercompany balances and transactions have been eliminated in consolidation.

Subsequent Event Considerations

The Company considers events or transactions that occur after the balance sheet date but prior to the issuance of the Unaudited Condensed Consolidated Financial Statements to provide additional evidence for certain estimates or to identify matters that require additional disclosure. The Company has evaluated all subsequent events and determined that there are no material recognized or unrecognized subsequent events requiring disclosure.

Use of Estimates

The preparation of the Unaudited Condensed Consolidated Financial Statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenue and expense during the reporting period.

Although the Company regularly assesses these estimates, actual results could differ materially from these estimates. The Company bases its estimates on historical experience and various other assumptions that it believes to be reasonable under the circumstances. Actual results may differ from management’s estimates if these results differ from historical experience, or other assumptions do not turn out to be substantially accurate, even if such assumptions are reasonable when made. Changes in estimates are recognized in the period in which they become known.

Critical estimates relied upon in preparing the Unaudited Condensed Consolidated Financial Statements include the determination of sales allowance and variable consideration in the Company’s revenue recognition, the impairment and useful lives of long-lived assets, the capitalization and useful lives of product, technology, and development costs for website development, internal-use software, and hosting arrangements, and the valuation and recoverability of intangible assets and goodwill. Accordingly, the Company considers these to be its critical accounting estimates, and believes that of the Company’s significant accounting policies, these involve the greatest degree of judgment and complexity.

Due to the partial impairment of the CarOffer reporting unit goodwill and other long-lived assets during the year ended December 31, 2024, in which the CarOffer reporting unit was reduced to its fair value, there remains a risk for future impairment charges if projected future operating results further decline, including as a result of economic conditions or operational challenges, which could be material and negatively affect its operations.

Concentration of Credit Risk

The Company has no significant off-balance sheet risk, such as foreign exchange contracts, option contracts, or other foreign hedging arrangements. Financial instruments that potentially expose the Company to concentrations of credit risk consist primarily of cash, cash equivalents, trade accounts receivable, and other receivables.

The Company maintains its cash and cash equivalents, principally with accredited financial institutions of high credit standing. Although the Company deposits its cash and cash equivalents with multiple financial institutions, its deposits with each such financial institution exceed governmental insured limits.

The Company routinely assesses the creditworthiness of its customers and does not require collateral. The Company generally has not experienced any material losses related to receivables from individual customers or groups of customers.

The Company had no material losses related to marketplace receivables as the losses were dispersed across a large number of customers. The Company had no material losses related to wholesale and product receivables as the third-party transaction processor does not release the title to the vehicle until successfully collecting funds from the buying dealer. Titling is handled by the Company’s third-party transaction processor and titles are held in escrow until it collects funds from the buying dealer (i.e., title is legally transferred from the selling party to the buying party upon signing of bill of sale, but title is held in escrow by the third-party transaction processor until payment is received). Due to these factors, no additional credit risk beyond amounts provided for collection losses was believed by management to be probable in the Company’s accounts receivable and other receivables.

As of March 31, 2025, a payment processor for several hundred dealer accounts represented 10.6% of net accounts receivable and other receivables. The related accounts receivable balance included unbilled and billed receivables that are not past due. The concentration was driven by the timing of payments pursuant to the agreement with the payment processor, as well as a decrease in the total accounts receivable, net balance as of March 31, 2025. The remainder of the accounts receivable was dispersed among more than 1,000 customers. Therefore, the Company does not believe there is significant credit risk with respect to accounts receivable. As of December 31, 2024, there was no concentration in excess of 10% of net accounts receivable and other receivables.

For the three months ended March 31, 2025 and 2024, no customer accounted for more than 10% of total revenue.

As of March 31, 2025 and December 31, 2024, $13,663 and $13,213, respectively, was included in accounts receivable, net representing unbilled accounts receivable relating primarily to both advertising customers and dealers invoiced in the period subsequent to services rendered and revenue recognition adjustments for Company offered discounts given to dealers in accordance with ASC Topic 606, Revenue from Contracts with Customers (“ASC 606”).

Significant Accounting Policies

The Unaudited Condensed Consolidated Financial Statements reflect the application of certain significant accounting policies as described below and elsewhere in these notes to the Unaudited Condensed Consolidated Financial Statements. As of March 31, 2025, there have been no material changes in the Company’s significant accounting policies, which are detailed in the Annual Report.

Recent Accounting Pronouncements Not Yet Adopted

From time to time, new accounting pronouncements are issued by the FASB or other standard-setting bodies and adopted by the Company on or prior to the specified effective date. Unless otherwise disclosed below, the Company believes that the impact of recently issued standards that are not yet effective will not have a material impact on its financial position or results of operations upon adoption. As of March 31, 2025, there are no new accounting pronouncements that the Company is considering adopting, other than those described below.

In November 2024 the FASB issued ASU 2024-03, Income Statement-Reporting Comprehensive Income-Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses (“ASU 2024-03”). ASU 2024-03 is intended to provide more detailed expense information and requires additional disaggregated disclosures in the notes to the financial statements for categories of expenses that are included on the face of the income statement. ASU 2024-03 is effective for the fiscal years beginning after December 15, 2026, and interim periods within fiscal years beginning after December 15, 2027. Early adoption is permitted. ASU 2024-03 may be applied either prospectively to financial statements issued for periods after the effective date of ASU 2024-03 or retrospectively to all prior periods presented in the consolidated financial statements. The Company is currently evaluating the impact of ASU 2024-03 on its future consolidated financial statements and related disclosures.

In December 2023 the FASB issued ASU 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures (“ASU 2023-09”). ASU 2023-09 is intended to enhance the transparency and decision usefulness of income tax disclosures. ASU 2023-09 addresses investor requests for enhanced income tax information primarily through changes to the rate reconciliation and income taxes paid information. Early adoption is permitted. A public entity should apply ASU 2023-09 prospectively to all annual periods beginning after December 15, 2024. The Company is currently evaluating the impact of ASU 2023-09 on its future consolidated financial statements and related disclosures.

Earnings Per Share

The Company has two classes of common stock authorized: Class A common stock and Class B common stock. The rights of the holders of Class A and Class B common stock are identical, except with respect to voting and conversion. Each share of Class A common stock is entitled to one vote per share and each share of Class B common stock is entitled to ten votes per share. Each share of Class B common stock is convertible into one share of Class A common stock at the option of the holder at any time or automatically upon certain events described in the Company’s fourth amended and restated certificate of incorporation, including upon either the death or voluntary termination of the Company’s Executive Chair. The Company allocates undistributed earnings attributable to common stock between the common stock classes on a one‑to‑one basis when computing net income per share. As a result, basic and diluted net income per share of Class A common stock and per share of Class B common stock are equivalent.