Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Current Assets
Cash and cash equivalents	$ 11,155	$ 14,625
Prepaid expenses and other current assets	1,332	1,591
Total Current Assets	12,487	16,216
Property and equipment, net	38	37
Deposits and other assets	6	4
Total Assets	12,531	16,257
Current Liabilities:
Accounts payable	773	142
Accrued liabilities	0	885
Total Current Liabilities	773	1,027
Total Liabilities	773	1,027
Stockholders' Equity
Preferred stock, $0.001 par value; 10,000,000 shares authorized, none issued and outstanding	0	0
Common stock, $0.001 par value; 100,000,000 shares authorized, 58,524,052 issued and 58,442,570 outstanding and 58,295,808 issued and 58,214,326 outstanding	58	58
Additional paid-in capital	96,796	96,430
Accumulated deficit	(85,096)	(81,258)
Total Synthetic Biologics, Inc. and Subsidiaries Equity	11,758	15,230
Non-controlling interest	0	0
Total Equity	11,758	15,230
Total Liabilities and Equity	$ 12,531	$ 16,257