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Summary of Significant Accounting Policies (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Numerator:    
Net loss $ (6,706,972)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ (10,058,996)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Change in fair value of warrant liability 3,436,195us-gaap_GainLossOnDerivativeInstrumentsNetPretax (3,654,770)us-gaap_GainLossOnDerivativeInstrumentsNetPretax
Net loss for diluted earnings per share $ (10,143,167)us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted $ 10,058,996us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
Denominator:    
Weighted-average basic common shares outstanding 20,638,421us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 15,463,256us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Assumed conversion of dilutive securities:    
Common stock purchase warrants 2,946,523sngx_ConversionOfDilutiveSecuritiesCommonStockPurchaseWarrants   
Denominator for diluted earnings per share - adjusted weighted-average shares 23,584,944us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment 15,463,256us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Earnings Per Share, Basic $ (0.32)us-gaap_EarningsPerShareBasic $ (0.65)us-gaap_EarningsPerShareBasic
Earnings Per Share, Diluted $ (0.43)us-gaap_EarningsPerShareDiluted $ (0.65)us-gaap_EarningsPerShareDiluted