Quarterly report pursuant to Section 13 or 15(d)

Document and Entity Information

Document and Entity Information - shares
9 Months Ended
Sep. 30, 2023
Nov. 10, 2023
Document Information [Line Items]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Sep. 30, 2023  
Document Fiscal Year Focus 2023  
Document Fiscal Period Focus Q3  
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  
Entity Current Reporting Status Yes  
Entity File Number 001-39994  
Entity Tax Identification Number 40-0023833  
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 Quarterly Report true  
Document Transition Report false  
Common Class A [Member]    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   3,507,084
Common Class B [Member]    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   3,327,379