v3.26.1
Document And Entity Information - shares
6 Months Ended
Jun. 30, 2026
Aug. 04, 2026
Document Information [Line Items]    
Entity Central Index Key 0001533040  
Entity Registrant Name Phio Pharmaceuticals Corp  
Amendment Flag false  
Current Fiscal Year End Date --12-31  
Document Fiscal Period Focus Q2  
Document Fiscal Year Focus 2026  
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2026  
Document Transition Report false  
Entity File Number 001-36304  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 45-3215903  
Entity Address, Address Line One 411 Swedeland Road, Suite 23-1080  
Entity Address, City or Town King of Prussia  
Entity Address, State or Province PA  
Entity Address, Postal Zip Code 19406  
City Area Code 610  
Local Phone Number 947-0251  
Title of 12(b) Security Common Stock, par value, $0.0001 per share  
Trading Symbol PHIO  
Security Exchange Name NASDAQ  
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 Common Stock, Shares Outstanding   11,617,250