v3.24.2
Cover - USD ($)
 12 Months Ended
Dec. 31, 2023
Mar. 19, 2024
Jun. 30, 2023
Cover [Abstract]      
Document Type 10-K/A    
Amendment Flag true    
Amendment Description This Amendment No. 2 to Form 10-K/A (this “Amendment”) amends the Annual Report on Form 10-K of Fathom Holdings Inc. (the “Company, “Fathom,” “we,” “us” or “our”) for the year ended December 31, 2023, filed with the Securities and Exchange Commission on March 19, 2024, as amended by Amendment No. 1 on Form 10-K/A filed on April 29, 2024 (as amended, the “Original Form 10-K”), is being filed for the purposes of amending the Executive Compensation table in Part III, Item 11 of the Original Form 10-K.    
Document Annual Report true    
Document Transition Report false    
Document Period End Date Dec. 31, 2023    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2023    
Current Fiscal Year End Date --12-31    
Entity File Number 001-39412    
Entity Registrant Name FATHOM HOLDINGS INC.    
Entity Central Index Key 0001753162    
Entity Tax Identification Number 82-1518164    
Entity Incorporation, State or Country Code NC    
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 Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company true    
Elected Not To Use the Extended Transition Period true    
Entity Shell Company false    
Entity Public Float     $ 66,327,887
Entity Common Stock, Shares Outstanding   20,776,292  
ICFR Auditor Attestation Flag false    
Document Financial Statement Error Correction [Flag] false    
Auditor Firm ID 34    
Auditor Name Deloitte & Touche LLP    
Auditor Location Raleigh, North Carolina