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Income Taxes (Details 1)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Reconciliations of difference between income tax benefit computed at federal and state statutory tax rates and provision for income tax benefit    
Income tax loss at federal statutory rate (34.00%)us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate (34.00%)us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
State tax benefits, plus sale of NJ NOLs, net of federal benefit (6.00%)us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes (6.00%)us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Subtotal (40.00%)sngx_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRateAndStateTaxes (40.00%)sngx_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRateAndStateTaxes
Valuation allowance 32.54%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance 28.87%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
Income tax benefit (7.46%)us-gaap_EffectiveIncomeTaxRateContinuingOperations (11.13%)us-gaap_EffectiveIncomeTaxRateContinuingOperations