Annual report pursuant to Section 13 and 15(d)

Document And Entity Information

v2.4.1.9
Document And Entity Information (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Mar. 10, 2015
Jun. 30, 2014
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 Accelerated Filer    
Trading Symbol SYN    
Entity Common Stock, Shares Outstanding   72,725,987dei_EntityCommonStockSharesOutstanding  
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2014    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2014    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Public Float     $ 79.4dei_EntityPublicFloat