Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2024	Oct. 25, 2024
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2024
Document Fiscal Year Focus	2024
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, $0.01 par value per share
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		39,021,418