Annual report pursuant to Section 13 and 15(d)

Document and Entity Information

v2.4.0.6
Document and Entity Information (USD $)
12 Months Ended
Dec. 31, 2011
Mar. 26, 2012
Jun. 30, 2011
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   32,701,984  
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2011    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2011    
Entity Well-Known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Public Float     $ 16,266,000