Annual report pursuant to Section 13 and 15(d)

Document And Entity Information

v2.4.0.8
Document And Entity Information (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Mar. 27, 2014
Jun. 28, 2013
Document Information [Line Items]      
Entity Registrant Name Synthetic Biologics, Inc.    
Entity Central Index Key 0000894158    
Current Fiscal Year End Date --12-31    
Entity Filer Category Smaller Reporting Company    
Trading Symbol SYN    
Entity Common Stock, Shares Outstanding   58,276,556  
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2013    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2013    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Public Float     $ 47.1