v3.26.1
Cover - USD ($)
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Jun. 15, 2026
Jun. 30, 2025
Cover [Abstract]        
Document Type 10-K/A      
Amendment Flag true      
Amendment Description This Amendment No. 1 on Form 10-K/A (this “Amendment No. 1”) to the Annual Report on Form 10-K of Pulmatrix, Inc. (the “Company”) for the fiscal year ended December 31, 2025, originally filed with the U.S. Securities and Exchange Commission (the “SEC”) on February 26, 2026 (the “Original Filing”), is being filed solely to correct a typographical error in the date of the Report of Independent Registered Public Accounting Firm included in Part II, Item 8 of the Original Filing. In accordance with Rule 12b-15 under the Securities Exchange Act of 1934, as amended (the “Exchange Act”), the Company is also including the entire text of Part II, Item 8 of the Original Filing in this Amendment No. 1. However, there have been no changes to the text of such Part II, Item 8, other than the change stated in the first sentence of this paragraph.  Pursuant to the rules of the SEC, Part IV, Item 15 has also been amended to contain the currently dated certifications from the Company’s principal executive officer and principal financial officer pursuant to Section 302 and Section 906 of the Sarbanes-Oxley Act of 2002 as Exhibits 31.1 and 32.1, respectively. As this Amendment No. 1 does not contain or amend any disclosure with respect to Items 307 or 308 of Regulation S-K, paragraphs 4 and 5 of the certifications pursuant to Section 302 have been omitted. Other than Exhibits 31.1 and 32.1, there have been no other changes to the exhibits filed with the Original Filing.   Except as described above or as otherwise expressly provided by the terms of this Amendment No. 1, no other changes have been made to the Original Filing. This Amendment No. 1 continues to speak as of the date of the Original Filing, and the Company has not updated the disclosures contained therein to reflect any events that occurred subsequent to the date of the Original Filing. This Amendment No. 1 should be read in conjunction with the Original Filing and with our filings with the SEC subsequent to the Original Filing. Capitalized terms used herein and not otherwise defined are defined as set forth in the Original Filing.      
Document Annual Report true      
Document Transition Report false      
Document Period End Date Dec. 31, 2025      
Document Fiscal Period Focus FY      
Document Fiscal Year Focus 2025      
Current Fiscal Year End Date --12-31      
Entity File Number 001-36199      
Entity Registrant Name PULMATRIX, INC.      
Entity Central Index Key 0001574235      
Entity Tax Identification Number 46-1821392      
Entity Incorporation, State or Country Code DE      
Entity Address, Address Line One 945 Concord Street      
Entity Address, Address Line Two Suite 1217      
Entity Address, City or Town Framingham      
Entity Address, State or Province MA      
Entity Address, Postal Zip Code 01701      
City Area Code (888)      
Local Phone Number 355-4440      
Title of 12(b) Security Common Stock, par value $0.0001 per share      
Trading Symbol PULM      
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      
Entity Shell Company false      
Entity Public Float       $ 25,200,594
Entity Common Stock, Shares Outstanding     3,652,285  
Documents Incorporated by Reference None      
ICFR Auditor Attestation Flag false      
Document Financial Statement Error Correction [Flag] false      
Entity listing par value per share $ 0.0001      
Auditor Firm ID 199 688    
Auditor Opinion [Text Block] We have audited the accompanying consolidated balance sheet of Pulmatrix, Inc. (the “Company”) as of December 31, 2025, the related consolidated statements of operations, stockholders’ equity and cash flows for the year ended December 31, 2025, and the related notes (collectively referred to as the “financial statements”). In our opinion, the financial statements present fairly, in all material respects, the financial position of the Company as of December 31, 2025, and the results of its operations and its cash flows for the year ended December 31, 2025, in conformity with accounting principles generally accepted in the United States of America.      
Auditor Name CBIZ CPAs P.C. Marcum LLP    
Auditor Location New York, NY New York, NY