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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2023
Apr. 25, 2024
Jun. 30, 2023
Document Information [Line Items]      
Document Type 10-K/A    
Amendment Flag true    
Amendment Description Marchex, Inc. (the “Company,” “we,” “us,” “our,” or “Marchex”) is filing this Amendment No. 1 on Form 10-K/A (this “Amendment”) to amend our Annual Report on Form 10-K for the fiscal year ended December 31, 2023 (the “Form 10-K”), as originally filed with the United States Securities and Exchange Commission (the “SEC”) on April 1, 2024. The purpose of this Amendment is to include Part III information which was to be incorporated by reference from our definitive proxy statement for our 2024 Annual Meeting of Stockholders. This information was previously omitted from the 10-K in reliance on General Instruction G(3) to Form 10-K, which permits the Part III information to be incorporated in our Form 10-K by reference from our definitive proxy statement if such statement is filed no later than 120 days after our fiscal year-end. We are filing this Amendment to include Part III information in our Form 10-K because a definitive proxy statement containing such information will not be filed by the Company within 120 days after the end of the fiscal year covered by our Form 10-K. The reference on the cover to the Form 10-K to the incorporation by reference to portions of our definitive proxy statement into Part III of the Form 10-K is hereby deleted. This Amendment also corrects an inadvertent error in the aggregate market value of the voting and non-voting common equity held by non-affiliates of the Company on June 30, 2023 set forth on the cover of the Form 10-K. In accordance with Rule 12b-15 under the United States Securities Exchange Act of 1934, as amended (the “Exchange Act”), the cover page to the Form 10-K, Part III, Items 10 through 14 of our Form 10-K are hereby amended and restated in their entirety. In addition, a new certification of our principal executive officer and principal financial officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 is attached dated as of the filing date of this Amendment. This Amendment does not amend or otherwise update any other information in our 10-K. Accordingly, this Amendment should be read in conjunction with our Form 10-K and with our filings with the SEC subsequent to our Form 10-K.    
Document Period End Date Dec. 31, 2023    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY    
Entity Registrant Name Marchex, Inc.    
Entity Central Index Key 0001224133    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Interactive Data Current Yes    
Current Fiscal Year End Date --12-31    
Entity Filer Category Non-accelerated Filer    
Entity Well Known Seasoned Issuer No    
Entity Shell Company false    
Entity Small Business true    
Entity Emerging Growth Company false    
Title of 12(b) Security Class B Common Stock, $0.01 par value per share    
Trading Symbol MCHX    
Security Exchange Name NASDAQ    
Entity File Number 000-50658    
Entity Incorporation, State or Country Code DE    
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    
Document Annual Report true    
Document Transition Report false    
ICFR Auditor Attestation Flag false    
Document Financial Statement Error Correction [Flag] false    
Entity Public Float     $ 73,935,229
Auditor Name RSM US LLP (“RSM”)    
Auditor Location Seattle, WA    
Auditor Firm ID 49    
Documents Incorporated by Reference

The following documents (or parts thereof) are incorporated by reference into the following parts of this Form 10-K/A: None.

    
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   39,017,668