Annual report pursuant to Section 13 and 15(d)

Document and Entity Information

Document and Entity Information - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Feb. 18, 2020
Jun. 28, 2019
Document and Entity Information      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2019    
Document Fiscal Year Focus 2019    
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 Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Public Float     $ 8,950
Trading Symbol SYN    
Entity Common Stock, Shares Outstanding   16,956,865  
Entity Small Business true    
Entity Emerging Growth Company false    
Entity Shell Company false