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Document and Entity Information - shares
 3 Months Ended
Mar. 31, 2023
May 01, 2023
Document Information [Line Items]    
Document Type 10-Q/A  
Amendment Flag true  
Amendment Description This Amendment No. 1 on Form 10-Q/A (this “Amendment”) amends the Quarterly Report on Form 10-Q of Marchex, Inc. (the “Company”) for the quarter ended March 31, 2023, that was filed with the Securities and Exchange Commission (the “SEC”) on May 5, 2023 (the “Original Filing”). The purpose of this Amendment is solely to correct inadvertent errors in Exhibits 31.1 and 32 to the Original Filing, specifically Exhibit 31.1 referencing the Annual Report on Form 10-K rather than the Quarterly Report on Form 10-Q, and Exhibit 32 referencing the period ended March 31, 2022 rather than March 31, 2023 and not being signed by the Company's Principal Executive Officer. Accordingly, the Company is filing revised Exhibits 31.1 and 32 to correct these inadvertent errors. Because the other exhibits contained in the Original Filing are unchanged, the Company has also revised the Exhibit Index in Item 6 of Part II to indicate such other exhibits are incorporated by reference from the Original Filing. The remainder of the text of Original Filing is included in this Amendment without change. Except for the revised Exhibits 31.1 and 32 and the changes to the Exhibit Index, this Amendment continues to speak as of the date of the Original Filing and does not reflect events occurring after the date of the Original Filing or modify or update the disclosures therein in any way.  
Document Period End Date Mar. 31, 2023  
Document Fiscal Year Focus 2023  
Document Fiscal Period Focus Q1  
Trading Symbol MCHX  
Entity Registrant Name Marchex, Inc.  
Entity Central Index Key 0001224133  
Current Fiscal Year End Date --12-31  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company false  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Title of 12(b) Security Class B Common Stock  
Security Exchange Name NASDAQ  
Entity Shell Company false  
Entity File Number 000-50658  
Entity Tax Identification Number 35-2194038  
Entity Address, Address Line One 1200 5th Ave  
Entity Address, Address Line Two Suite 1300  
Entity Address, City or Town Seattle  
Entity Address, State or Province WA  
Entity Address, Postal Zip Code 98101  
City Area Code 206  
Local Phone Number 331-3300  
Entity Incorporation, State or Country Code DE  
Document Quarterly Report true  
Document Transition Report false  
Class A    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   4,660,927
Class B    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   38,688,784