Annual report pursuant to Section 13 and 15(d)

Document And Entity Information

v3.8.0.1
Document And Entity Information - USD ($)
12 Months Ended
Dec. 31, 2017
Mar. 09, 2018
Jun. 30, 2017
Document And Entity Information      
Entity Registrant Name FUSION TELECOMMUNICATIONS INTERNATIONAL INC    
Entity Central Index Key 0001071411    
Document Type 10-K    
Document Period End Date Dec. 31, 2017    
Amendment Flag false    
Current Fiscal Year End Date --12-31    
Is Entity a Well-known Seasoned Issuer? No    
Is Entity a Voluntary Filer? No    
Is Entity's Reporting Status Current? Yes    
Entity Filer Category Smaller Reporting Company    
Entity Common Stock, Shares Outstanding   35,579,756  
Entity Public Float     $ 19,148,262
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2017