Document and Entity Information - USD ($)	12 Months Ended
Document and Entity Information - USD ($)	Dec. 31, 2023	Apr. 11, 2024	Apr. 10, 2024
Document Information [Line Items]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2023
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2023
Trading Symbol	FATH
Entity Registrant Name	FATHOM DIGITAL MANUFACTURING CORPORATION
Entity Central Index Key	0001836176
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Shell Company	false
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
ICFR Auditor Attestation Flag	false
Document Financial Statement Error Correction [Flag]	true
Document Financial Statement Restatement Recovery Analysis [Flag]	false
Entity Current Reporting Status	Yes
Entity Public Float			$ 10,407,262
Entity Voluntary Filers	No
Entity Well-known Seasoned Issuer	No
Entity File Number	001-39994
Entity Tax Identification Number	98-1571400
Entity Address, Address Line One	1050 Walnut Ridge Drive
Entity Address, City or Town	Hartland
Entity Address, State or Province	WI
Entity Address, Postal Zip Code	53029
City Area Code	262
Local Phone Number	367-8254
Entity Interactive Data Current	Yes
Entity Incorporation, State or Country Code	DE
Title of 12(b) Security	Class A common stock, par value $0.0001 per share
Security Exchange Name	NYSE
Document Annual Report	true
Document Transition Report	false
Auditor Name	GRANT THORNTON LLP
Auditor Firm ID	248
Auditor Location	Milwaukee, WI
Documents Incorporated by Reference [Text Block]	DOCUMENTS INCORPORATED BY REFERENCE Portions of Fathom Digital Manufacturing Corporation’s definitive Proxy Statement, to be filed with the Securities and Exchange Commission within 120 days of December 31, 2023 and delivered to stockholders in connection with the 2024 Annual Meeting of Stockholders, as applicable are incorporated by reference into Part III of this Form 10-K.
Class A Common Stock [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		3,649,866
Class B Common Stock [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		3,327,379

Fathom Digital Manufacturing Corp 10-K