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Document And Entity Information - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Feb. 28, 2025
Jun. 28, 2024
Document And Entity Information [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2024    
Document Transition Report false    
Securities Act File Number 001-37544    
Entity Registrant Name ARMATA PHARMACEUTICALS, INC.    
Entity Incorporation, State or Country Code WA    
Entity Tax Identification Number 91-1549568    
Entity Address, Address Line One 5005 McConnell Avenue    
Entity Address, City or Town Los Angeles    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 90066    
City Area Code 310    
Local Phone Number 665-2928    
Title of 12(b) Security Common Stock    
Trading Symbol ARMP    
Security Exchange Name NYSEAMER    
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     $ 30.3
Entity Common Stock, Shares Outstanding   36,183,067  
Documents Incorporated by Reference

Portions of the registrant’s Definitive Proxy Statement relating to the 2025 Annual Meeting of Stockholders, which will be filed with the Securities and Exchange Commission within 120 days after the end of the registrant’s fiscal year ended December 31, 2024, are incorporated by reference into Part III of this Annual Report on Form 10-K.

    
Auditor Firm ID 42    
Auditor Name Ernst & Young LLP    
Auditor Location San Diego, California    
Entity Central Index Key 0000921114    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2024    
Document Fiscal Period Focus FY    
Amendment Flag false