Quarterly report pursuant to Section 13 or 15(d)

Document and Entity Information

Document and Entity Information - shares
9 Months Ended
Sep. 30, 2022
Nov. 08, 2022
Document and Entity Information [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Transition Report false  
Document Period End Date Sep. 30, 2022  
Entity File Number 001-39412  
Entity Registrant Name FATHOM HOLDINGS INC.  
Entity Incorporation, State or Country Code NC  
Entity Tax Identification Number 82-1518164  
Entity Address, Address Line One 2000 Regency Parkway Drive  
Entity Address, Address Line Two Suite 300  
Entity Address, City or Town Cary  
Entity Address State Or Province NC  
Entity Address, Postal Zip Code 27518  
City Area Code 888  
Local Phone Number 455-6040  
Title of 12(b) Security Common Stock, No Par Value  
Trading Symbol FTHM  
Security Exchange Name NASDAQ  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company true  
Entity Ex Transition Period true  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   17,074,582
Entity Central Index Key 0001753162  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2022  
Document Fiscal Period Focus Q3  
Amendment Flag false