Cover - USD ($)	12 Months Ended
Cover - USD ($)	Dec. 31, 2025	Mar. 27, 2026	Jun. 30, 2025
Cover [Abstract]
Document Type	10-K/A
Document Annual Report	true
Document Period End Date	Dec. 31, 2025
Current Fiscal Year End Date	--12-31
Document Transition Report	false
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 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	false
ICFR Auditor Attestation Flag	false
Document Financial Statement Error Correction [Flag]	false
Entity Shell Company	false
Entity Public Float			$ 21,905,061
Entity Common Stock, Shares Outstanding		32,782,364
Entity Central Index Key	0001753162
Document Fiscal Year Focus	2025
Document Fiscal Period Focus	FY
Amendment Flag	true
Amendment Description	This Amendment No. 1 on Form 10-K/A (this “Amendment”) to the Annual Report on Form 10-K of Fathom Holdings Inc. (the “Company, “Fathom,” “we,” “us” or “our”) for the year ended December 31, 2025, filed with the Securities and Exchange Commission on March 30, 2026 (the “Original 10-K”), is being filed for the purposes of including the information required by Part III (Items 10-14) of Form 10-K. At the time the Company filed the Original 10-K, it intended to file a definitive proxy statement for its 2026 Annual Meeting of Stockholders within 120 days after the end of its fiscal year pursuant to Regulation 14A promulgated under the Securities Exchange Act of 1934, as amended (the “Exchange Act”). Because the Company will not file the definitive proxy statement within such 120-day period, the omitted information is filed herewith and provided below as required. Pursuant to Rule 12b-15 under the Exchange Act, this Amendment also contains certifications pursuant to Section 302 of the Sarbanes-Oxley Act of 2002, which are attached hereto. Because no financial statements have been included in this Amendment and this Amendment does not contain or amend any disclosure with respect to Items 307 and 308 of Regulation S-K, paragraphs 3, 4, and 5 of the certifications have been omitted. As a result, Part III, Items 10-14 of the Company’s Original 10-K are hereby amended and restated in their entirety.Except as described above, this Amendment does not modify or update disclosure in, or exhibits to, the Original 10-K, and such disclosure in, or exhibits to, the Original 10-K remain unchanged and speak as of the date of the filing of the Original 10-K. In particular, the Amendment does not change any previously reported financial results, nor does it reflect events occurring after the date of the Original 10-K. Because no financial statements are contained within this Amendment, the Company is not including certifications pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.

Fathom Holdings Inc. 10-K/A