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CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) (USD $)
 9 Months Ended
Apr. 30, 2015
Apr. 30, 2014
Cash Flows From Operating Activities:    
Net (loss)/income $ (1,858,450)us-gaap_NetIncomeLoss $ (2,385,273)us-gaap_NetIncomeLoss
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 291,404us-gaap_DepreciationDepletionAndAmortization 280,743us-gaap_DepreciationDepletionAndAmortization
Stock compensation expense    262,871us-gaap_AllocatedShareBasedCompensationExpense
Common stock issued for services rendered 94,312GNBT_CommonStockIssuedForServicesRendered 360,500GNBT_CommonStockIssuedForServicesRendered
Gain on disposal of property and equipment    (188,869)us-gaap_GainLossOnSaleOfPropertyPlantEquipment
Common stock issued as make-whole payments on preferred stock 104,423GNBT_CommonStockIssuedAsMakewholePaymentsOnPreferredStock 522,450GNBT_CommonStockIssuedAsMakewholePaymentsOnPreferredStock
Change in fair value of derivative liabilities (665,491)us-gaap_DerivativeGainLossOnDerivativeNet (1,360,818)us-gaap_DerivativeGainLossOnDerivativeNet
Changes in operating assets and liabilities    
Accounts payable and accrued expenses (378,275)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities (300,383)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
Deferred revenue    (1,181)us-gaap_IncreaseDecreaseInDeferredRevenue
Other current assets 150,565us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet 51,003us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet
Net Cash Used in Operating Activities (2,261,512)us-gaap_NetCashProvidedByUsedInOperatingActivities (2,758,957)us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash Flows From Investing Activities:    
Proceeds from sale of property and equipment    883,780us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
Costs incurred for patents (84,389)us-gaap_PaymentsToAcquireIntangibleAssets (61,812)us-gaap_PaymentsToAcquireIntangibleAssets
Net Cash (Used in)/Provided By Investing Activities (84,389)us-gaap_NetCashProvidedByUsedInInvestingActivities 821,968us-gaap_NetCashProvidedByUsedInInvestingActivities
Cash Flows From Financing Activities:    
Repayment of long-term debt    (606,806)us-gaap_RepaymentsOfLongTermDebt
Proceeds from exercise of warrants, net    2,301,944us-gaap_ProceedsFromWarrantExercises
Proceeds from exercise of stock options 6,416us-gaap_ProceedsFromStockOptionsExercised 526us-gaap_ProceedsFromStockOptionsExercised
Proceeds from issuance of preferred stock, net    2,770,000us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock
Net Cash Provided by Financing Activities 6,416us-gaap_NetCashProvidedByUsedInFinancingActivities 4,465,664us-gaap_NetCashProvidedByUsedInFinancingActivities
Effect of Exchange Rates on Cash (4,078)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents (18,894)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
Net (Decrease)/Increase in Cash and Cash Equivalents (2,343,563)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 2,509,781us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and Cash Equivalents, Beginning of Period 3,269,489us-gaap_CashAndCashEquivalentsAtCarryingValue 1,708,954us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and Cash Equivalents, End of Period 925,926us-gaap_CashAndCashEquivalentsAtCarryingValue 4,218,735us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental Disclosure of Cash Flow Information    
Interest paid in cash    $ 35,542us-gaap_InterestPaid