Fathom Holdings Inc. Annual report [Section 13 and 15(d), not S-K Item 405]

Annual report [Section 13 and 15(d), not S-K Item 405]

Summary of Significant Accounting Policies - Narrative (Details)

Summary of Significant Accounting Policies - Narrative (Details) - USD ($)				1 Months Ended				11 Months Ended	12 Months Ended
	May 03, 2025	Apr. 07, 2025	May 03, 2024	Mar. 30, 2026	Sep. 30, 2025	Mar. 31, 2025	Mar. 28, 2025	Nov. 30, 2025	Dec. 31, 2025	Dec. 31, 2024	Nov. 28, 2025	Sep. 30, 2024
Property and Equipment, Net
Net loss									$ 20,307,000	$ 21,577,000
Cash and cash equivalents									5,773,000	7,127,000
Proceeds from sale of business									7,070,000	7,435,000
Other receivable-current									3,000,000	4,000,000
Repayment of note		$ 3,500,000
Short term obligations									8,700,000
Promissory note due									5,000,000.0
Liabilities related to legal settlements									3,700,000
Transaction fee									250
Agent annual fees receivable									6,000,000.0	$ 3,200,000
Agents fee on first sale									700
Impairment of goodwill									$ 0
Trade names
Property and Equipment, Net
Estimated useful life									10 years
Agent relationships
Property and Equipment, Net
Estimated useful life									7 years
Customer relationships
Property and Equipment, Net
Estimated useful life									8 years
Know-how relationships
Property and Equipment, Net
Estimated useful life									5 years
Software development
Property and Equipment, Net
Estimated useful life									5 years
2024 Notes \| Senior Secured Convertible Promissory Note
Property and Equipment, Net
Principal amount												$ 5,000,000.0
Subordinated Secured Promissory Note Maturing April 2027 \| Subordinated Debt \| Subsequent Event
Property and Equipment, Net
Proceeds from promissory note				$ 2,000,000.0
Common Stock \| Public Offering One
Property and Equipment, Net
Stock issued and sold (in shares)						3,505,364	3,505,364
Public offering price (in dollars per share)						$ 0.68	$ 0.68
Common Stock \| Public Offering Two \| Director
Property and Equipment, Net
Stock issued and sold (in shares)						832,639	832,639
Public offering price (in dollars per share)						$ 0.72	$ 0.72
Common Stock \| Secondary public offering
Property and Equipment, Net
Gross proceeds						$ 3,000,000.0	$ 3,000,000.0
Consideration received						$ 2,900,000	2,900,000
Common Stock \| Secondary public offering \| Director
Property and Equipment, Net
Gross proceeds							600,000
Consideration received							$ 500,000
Common Stock \| September 2025 Offering
Property and Equipment, Net
Stock issued and sold (in shares)					3,450,000
Public offering price (in dollars per share)					$ 2.00
Gross proceeds					$ 6,900,000
Consideration received					$ 6,500,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations \| Dagley Insurance Agency
Property and Equipment, Net
Proceeds from sale of business	$ 4,000,000.0		$ 7,400,000						$ 4,000,000.0
Aggregate selling price			$ 15,000,000.0
Disposal Group, Disposed of by Sale, Not Discontinued Operations \| LiveBy Disposal Group
Property and Equipment, Net
Net loss								$ 700,000
Aggregate selling price											$ 3,000,000.0