Annual report pursuant to Section 13 and 15(d)

Document And Entity Information

v3.3.1.900
Document And Entity Information - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Mar. 08, 2016
Jun. 30, 2015
Document Information [Line Items]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2015    
Document Fiscal Year Focus 2015    
Document Fiscal Period Focus FY    
Entity Registrant Name Synthetic Biologics, Inc.    
Entity Central Index Key 0000894158    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Filer Category Accelerated Filer    
Entity Public Float     $ 173.5
Trading Symbol SYN    
Entity Common Stock, Shares Outstanding   90,826,752