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Warrant Liabilities (Details) (USD $)
12 Months Ended 3 Months Ended
Dec. 31, 2014
Mar. 31, 2015
Jun. 30, 2013
Jun. 25, 2013
Summary of assumptions used in connection with the valuation of warrants issued        
Volatility 128.00%us-gaap_FairValueAssumptionsWeightedAverageVolatilityRate      
Risk-free interest rate 1.38%us-gaap_FairValueAssumptionsRiskFreeInterestRate      
Expected dividend yield 0.00%us-gaap_FairValueAssumptionsExpectedDividendRate      
Expected warrant life (years) 3 years 6 months      
Warrant [Member]        
Summary of assumptions used in connection with the valuation of warrants issued        
Number of shares underlying the warrants 4,723,357sngx_NumberOfSharesUnderlyingWarrants
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember
3,581,571sngx_NumberOfSharesUnderlyingWarrants
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember
   
Exercise price 0.61us-gaap_FairValueAssumptionsExercisePrice
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember
$ 0.61us-gaap_FairValueAssumptionsExercisePrice
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember
$ 0.65us-gaap_FairValueAssumptionsExercisePrice
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember
 
Volatility   119.00%us-gaap_FairValueAssumptionsWeightedAverageVolatilityRate
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember
   
Risk-free interest rate   0.89%us-gaap_FairValueAssumptionsRiskFreeInterestRate
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember
   
Expected dividend yield   0.00%us-gaap_FairValueAssumptionsExpectedDividendRate
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember
   
Expected warrant life (years)   3 years 2 months 27 days    
Stock Price 0.98us-gaap_SharePrice
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember
$ 1.69us-gaap_SharePrice
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember
  $ 0.96us-gaap_SharePrice
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember
Exercised during 2015        
Summary of assumptions used in connection with the valuation of warrants issued        
Number of shares underlying the warrants   1,141,786sngx_NumberOfSharesUnderlyingWarrants
/ us-gaap_StatementEquityComponentsAxis
= sngx_ExercisedWarrantsMember
   
Exercise price   $ 0.61us-gaap_FairValueAssumptionsExercisePrice
/ us-gaap_StatementEquityComponentsAxis
= sngx_ExercisedWarrantsMember
   
Volatility   119.00%us-gaap_FairValueAssumptionsWeightedAverageVolatilityRate
/ us-gaap_StatementEquityComponentsAxis
= sngx_ExercisedWarrantsMember
   
Risk-free interest rate   0.89%us-gaap_FairValueAssumptionsRiskFreeInterestRate
/ us-gaap_StatementEquityComponentsAxis
= sngx_ExercisedWarrantsMember
   
Expected dividend yield   0.00%us-gaap_FairValueAssumptionsExpectedDividendRate
/ us-gaap_StatementEquityComponentsAxis
= sngx_ExercisedWarrantsMember
   
Expected warrant life (years)   3 years 3 months 29 days    
Stock Price   $ 1.69us-gaap_SharePrice
/ us-gaap_StatementEquityComponentsAxis
= sngx_ExercisedWarrantsMember