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Derivative Liabilities - Fair value assumptions, derivative additional investment rights liability (Details) (USD $)
0 Months Ended
Jan. 31, 2015
Jul. 31, 2014
Notes to Financial Statements    
Underlying number of units of convertible preferred stock 2,075us-gaap_ConversionOfStockSharesConverted1 2,075us-gaap_ConversionOfStockSharesConverted1
Underlying number of units of warrants 69,166,667GNBT_WarrantsIssuable 69,166,667GNBT_WarrantsIssuable
Current exercise price of warrants $ 0.03us-gaap_FairValueAssumptionsExercisePrice $ 0.03us-gaap_FairValueAssumptionsExercisePrice
Current conversion price of preferred stock $ 0.03GNBT_PreferredStockConversionPricePerShare $ 0.03GNBT_PreferredStockConversionPricePerShare
Time to expiration 1 month 24 days 7 months 24 days
Risk-free interest rate 0.0002GNBT_RiskfreeInterestRate 0.0009GNBT_RiskfreeInterestRate
Estimated volatility 1.32GNBT_EstimatedVolatility 0.61GNBT_EstimatedVolatility
Dividend 0.00%us-gaap_FairValueAssumptionsExpectedDividendRate 0.00%us-gaap_FairValueAssumptionsExpectedDividendRate
Stock price at period end date $ 0.0159us-gaap_SharePrice $ 0.021us-gaap_SharePrice