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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2021
Mar. 29, 2022
Jun. 30, 2021
Document Information [Line Items]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2021    
Document Fiscal Year Focus 2021    
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 520 Pike Street    
Entity Address, Address Line Two Suite 2000    
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    
Entity Public Float     $ 103,936,159
Auditor Name Moss Adams LLP    
Auditor Location Seattle, WA    
Auditor Firm ID 659    
Documents Incorporated by Reference

Portions of the Registrant’s Definitive Proxy Statement relating to the 2022 Annual Meeting of Stockholders are incorporated herein by reference in Part III of this Annual Report on Form 10-K to the extent stated herein.

 

    
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   37,608,147