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Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Current Assets    
Cash and cash equivalents $ 12,049us-gaap_CashAndCashEquivalentsAtCarryingValue $ 17,525us-gaap_CashAndCashEquivalentsAtCarryingValue
Prepaid expenses and other current assets 1,574us-gaap_PrepaidExpenseAndOtherAssetsCurrent 1,548us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Total Current Assets 13,623us-gaap_AssetsCurrent 19,073us-gaap_AssetsCurrent
Property and equipment, net 75us-gaap_PropertyPlantAndEquipmentNet 65us-gaap_PropertyPlantAndEquipmentNet
Deposits and other assets 18syn_DepositsAndOtherAssetsNoncurrent 6syn_DepositsAndOtherAssetsNoncurrent
Total Assets 13,716us-gaap_Assets 19,144us-gaap_Assets
Current Liabilities:    
Accounts payable 1,559us-gaap_AccountsPayableCurrent 996us-gaap_AccountsPayableCurrent
Accrued expenses 2,646us-gaap_AccruedLiabilitiesCurrent 1,298us-gaap_AccruedLiabilitiesCurrent
Warrant liabilities 10,908syn_WarrantLiabilities 6,756syn_WarrantLiabilities
Accrued employee benefits 228us-gaap_AccruedEmployeeBenefitsCurrent 538us-gaap_AccruedEmployeeBenefitsCurrent
Total Current Liabilities 15,341us-gaap_LiabilitiesCurrent 9,588us-gaap_LiabilitiesCurrent
Total Liabilities 15,341us-gaap_Liabilities 9,588us-gaap_Liabilities
Commitments and Contingencies      
Stockholders' Equity (Deficit):    
Preferred stock, $0.001 par value; 10,000,000 shares authorized, none issued and outstanding 0us-gaap_PreferredStockValue 0us-gaap_PreferredStockValue
Common stock, $0.001 par value; 100,000,000 shares authorized, 72,725,987 issued and 72,807,469 outstanding and 72,594,626 issued and 72,513,144 outstanding 73us-gaap_CommonStockValue 72us-gaap_CommonStockValue
Additional paid-in capital 111,702us-gaap_AdditionalPaidInCapitalCommonStock 110,526us-gaap_AdditionalPaidInCapitalCommonStock
Accumulated deficit (113,400)us-gaap_RetainedEarningsAccumulatedDeficit (101,042)us-gaap_RetainedEarningsAccumulatedDeficit
Total Synthetic Biologics, Inc. and Subsidiaries Equity (Deficit) (1,625)us-gaap_StockholdersEquity 9,556us-gaap_StockholdersEquity
Non-controlling interest 0us-gaap_MinorityInterest 0us-gaap_MinorityInterest
Total Stockholders' Equity (Deficit) (1,625)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest 9,556us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Total Liabilities and Stockholders’ Equity $ 13,716us-gaap_LiabilitiesAndStockholdersEquity $ 19,144us-gaap_LiabilitiesAndStockholdersEquity