XML 11 R1.htm IDEA: XBRL DOCUMENT v3.21.2
Document and Entity Information - shares
 9 Months Ended
Sep. 30, 2021
Nov. 08, 2021
Document Information [Line Items]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Sep. 30, 2021  
Document Fiscal Year Focus 2021  
Document Fiscal Period Focus Q3  
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 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  
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   36,891,483