Description of Business, Company History and Summary of Significant Accounting Policies	3 Months Ended
Mar. 31, 2020
Accounting Policies [Abstract]
Description of Business, Company History and Summary of Significant Accounting Policies	NOTE 1. Description of Business, Company History and Summary of Significant Accounting Policies Description of Business. Cars.com Inc., (the “Company” or CARS) is a leading digital marketplace and solutions provider for the automotive industry that connects car shoppers with sellers and original equipment manufacturers (“OEM”s). The Company’s marketplace empowers shoppers with the resources and information to make confident car buying decisions while our digital solutions and technology platform help sellers improve operational efficiency, profitability and sales. The Company’s portfolio of brands includes Cars.com, Dealer Inspire and DealerRater, in addition to Auto.com, PickupTrucks.com and NewCars.com. Company History. In May 2017, the Company separated from its former parent company, TEGNA Inc. (“TEGNA”) by means of a spin-off of a newly formed company, Cars.com Inc., which now owns TEGNA’s former digital automotive marketplace business (the “Separation”). On May 31, 2017, the Company made a $650.0 million cash transfer to TEGNA and TEGNA completed the Separation through a pro rata distribution to its stockholders of all outstanding shares of the Company’s common stock. The Company’s common stock began trading “regular way” on the New York Stock Exchange on June 1, 2017. In February 2018, the Company acquired all of the outstanding stock of Dealer Inspire Inc., an innovative technology leader providing progressive dealer websites, digital retailing and messaging platform products, and substantially all of the net assets of Launch Digital Marketing LLC, a provider of digital marketing services, including paid, organic, social and creative services (collectively, the “DI Acquisition”). The post-DI Acquisition business related to Dealer Inspire, Inc. and Launch Digital Marketing LLC is referred to collectively as “Dealer Inspire”. Basis of Presentation. These accompanying unaudited interim Consolidated Financial Statements (“Consolidated Financial Statements”) have been prepared in conformity with accounting principles generally accepted in the United States of America (“U.S. GAAP”) and the rules and regulations of the Securities and Exchange Commission (the “SEC”) for interim financial statements. Accordingly, certain information and footnote disclosures normally included in financial statements prepared in accordance with U.S. GAAP have been condensed or omitted pursuant to the rules and regulations of the SEC. These Consolidated Financial Statements should be read in conjunction with the audited Consolidated Financial Statements and the notes thereto for the year ended December 31, 2019, which are included in the Company's Annual Report on Form 10-K dated February 26, 2020 (the “December 31, 2019 Financial Statements”). The significant accounting policies used in preparing these Consolidated Financial Statements were applied on a basis consistent with those reflected in the December 31, 2019 Financial Statements. In the opinion of management, the Consolidated Financial Statements contain all adjustments (consisting of a normal, recurring nature) necessary to present fairly the Company's financial position, results of operations, cash flows and changes in stockholders' equity as of the dates and for the periods indicated. The unaudited results of operations for the three months ended March 31, 2020 are not necessarily indicative of results that may be expected for the year ending December 31, 2020. Use of Estimates. The preparation of the accompanying Consolidated Financial Statements in accordance with U.S. GAAP requires management to make estimates and assumptions that affect amounts reported in the Consolidated Financial Statements and accompanying disclosures. Although these estimates are based on management’s best knowledge of current events and actions that the Company may undertake in the future, actual results may differ from those estimates. Principles of Consolidation. The accompanying Consolidated Financial Statements include the accounts of Cars.com Inc. and its 100% owned subsidiaries. All intercompany transactions and accounts are eliminated in consolidation.

Description of Business, Company History and Summary of Significant Accounting Policies

3 Months Ended

Mar. 31, 2020

Description of Business, Company History and Summary of Significant Accounting Policies

NOTE 1. Description of Business, Company History and Summary of Significant Accounting Policies

Description of Business. Cars.com Inc., (the “Company” or CARS) is a leading digital marketplace and solutions provider for the automotive industry that connects car shoppers with sellers and original equipment manufacturers (“OEM”s). The Company’s marketplace empowers shoppers with the resources and information to make confident car buying decisions while our digital solutions and technology platform help sellers improve operational efficiency, profitability and sales. The Company’s portfolio of brands includes Cars.com, Dealer Inspire and DealerRater, in addition to Auto.com, PickupTrucks.com and NewCars.com.

Company History. In May 2017, the Company separated from its former parent company, TEGNA Inc. (“TEGNA”) by means of a spin-off of a newly formed company, Cars.com Inc., which now owns TEGNA’s former digital automotive marketplace business (the “Separation”). On May 31, 2017, the Company made a $650.0 million cash transfer to TEGNA and TEGNA completed the Separation through a pro rata distribution to its stockholders of all outstanding shares of the Company’s common stock. The Company’s common stock began trading “regular way” on the New York Stock Exchange on June 1, 2017.

In February 2018, the Company acquired all of the outstanding stock of Dealer Inspire Inc., an innovative technology leader providing progressive dealer websites, digital retailing and messaging platform products, and substantially all of the net assets of Launch Digital Marketing LLC, a provider of digital marketing services, including paid, organic, social and creative services (collectively, the “DI Acquisition”). The post-DI Acquisition business related to Dealer Inspire, Inc. and Launch Digital Marketing LLC is referred to collectively as “Dealer Inspire”.

Basis of Presentation. These accompanying unaudited interim Consolidated Financial Statements (“Consolidated Financial Statements”) have been prepared in conformity with accounting principles generally accepted in the United States of America (“U.S. GAAP”) and the rules and regulations of the Securities and Exchange Commission (the “SEC”) for interim financial statements. Accordingly, certain information and footnote disclosures normally included in financial statements prepared in accordance with U.S. GAAP have been condensed or omitted pursuant to the rules and regulations of the SEC. These Consolidated Financial Statements should be read in conjunction with the audited Consolidated Financial Statements and the notes thereto for the year ended December 31, 2019, which are included in the Company's Annual Report on Form 10-K dated February 26, 2020 (the “December 31, 2019 Financial Statements”).

The significant accounting policies used in preparing these Consolidated Financial Statements were applied on a basis consistent with those reflected in the December 31, 2019 Financial Statements. In the opinion of management, the Consolidated Financial Statements contain all adjustments (consisting of a normal, recurring nature) necessary to present fairly the Company's financial position, results of operations, cash flows and changes in stockholders' equity as of the dates and for the periods indicated. The unaudited results of operations for the three months ended March 31, 2020 are not necessarily indicative of results that may be expected for the year ending December 31, 2020.

Use of Estimates. The preparation of the accompanying Consolidated Financial Statements in accordance with U.S. GAAP requires management to make estimates and assumptions that affect amounts reported in the Consolidated Financial Statements and accompanying disclosures. Although these estimates are based on management’s best knowledge of current events and actions that the Company may undertake in the future, actual results may differ from those estimates.

Principles of Consolidation. The accompanying Consolidated Financial Statements include the accounts of Cars.com Inc. and its 100% owned subsidiaries. All intercompany transactions and accounts are eliminated in consolidation.