Quarterly report pursuant to Section 13 or 15(d)

Document And Entity Information

Document And Entity Information - shares
9 Months Ended
Sep. 30, 2015
Nov. 02, 2015
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   90,810,086
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Sep. 30, 2015  
Document Fiscal Period Focus Q3  
Document Fiscal Year Focus 2015