General form of registration statement for all companies including face-amount certificate companies

Stock Options and Warrants - Additional Information (Detail)

v2.4.1.9
Stock Options and Warrants - Additional Information (Detail) (USD $)
 3 Months Ended 9 Months Ended 12 Months Ended 0 Months Ended 3 Months Ended
Feb. 28, 2015
Feb. 28, 2015
Feb. 28, 2014
May 31, 2014
May 31, 2013
Oct. 23, 2013
Mar. 17, 2014
Feb. 28, 2014
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Exercisable warrants, exercise price $ 0.50us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 $ 0.50us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1              
Term of Warrants   5 years              
Cash proceeds from warrant exercises   $ 1,066,436us-gaap_ProceedsFromWarrantExercises $ 50,000us-gaap_ProceedsFromWarrantExercises $ 50,000us-gaap_ProceedsFromWarrantExercises $ 201,000us-gaap_ProceedsFromWarrantExercises        
Interest expense associated with conversion and exercise inducement 202,295us-gaap_InducedConversionOfConvertibleDebtExpense 555,628us-gaap_InducedConversionOfConvertibleDebtExpense 193,160us-gaap_InducedConversionOfConvertibleDebtExpense 193,160us-gaap_InducedConversionOfConvertibleDebtExpense          
Compensation expense related to stock options and warrants         1,128,000us-gaap_AllocatedShareBasedCompensationExpense        
Stock warrants exercised       50,000cydy_StockIssuedDuringPeriodValueShareWarrantsExercised          
Warrants exercise price per share       $ 1.00cydy_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRightsExercised          
Convertible Debt                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Cash proceeds from warrant exercises   1,066,000us-gaap_ProceedsFromWarrantExercises
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember 		             
Convertible Debt | Inducement Options                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Shares of Common Stock issued upon exercise 1,413,333us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
/ us-gaap_TransactionTypeAxis
= cydy_InducementOptionsMember 		1,413,333us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
/ us-gaap_TransactionTypeAxis
= cydy_InducementOptionsMember 		             
Exercisable warrants, exercise price $ 0.55us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
/ us-gaap_TransactionTypeAxis
= cydy_InducementOptionsMember 		$ 0.55us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
/ us-gaap_TransactionTypeAxis
= cydy_InducementOptionsMember 		             
Cash proceeds from warrant exercises   777,333us-gaap_ProceedsFromWarrantExercises
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
/ us-gaap_TransactionTypeAxis
= cydy_InducementOptionsMember 		             
Interest expense associated with conversion and exercise inducement   353,000us-gaap_InducedConversionOfConvertibleDebtExpense
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
/ us-gaap_TransactionTypeAxis
= cydy_InducementOptionsMember 		             
Convertible Note One                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Shares of Common Stock issued upon exercise 525,641us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_DebtConversionByUniqueDescriptionAxis
= cydy_ConvertibleNoteOneMember 		525,641us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_DebtConversionByUniqueDescriptionAxis
= cydy_ConvertibleNoteOneMember 		             
Exercisable warrants, exercise price $ 0.55us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_DebtConversionByUniqueDescriptionAxis
= cydy_ConvertibleNoteOneMember 		$ 0.55us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_DebtConversionByUniqueDescriptionAxis
= cydy_ConvertibleNoteOneMember 		             
Cash proceeds from warrant exercises 289,103us-gaap_ProceedsFromWarrantExercises
/ us-gaap_DebtConversionByUniqueDescriptionAxis
= cydy_ConvertibleNoteOneMember 		777,333us-gaap_ProceedsFromWarrantExercises
/ us-gaap_DebtConversionByUniqueDescriptionAxis
= cydy_ConvertibleNoteOneMember 		             
Interest expense associated with conversion and exercise inducement 202,300us-gaap_InducedConversionOfConvertibleDebtExpense
/ us-gaap_DebtConversionByUniqueDescriptionAxis
= cydy_ConvertibleNoteOneMember 		353,000us-gaap_InducedConversionOfConvertibleDebtExpense
/ us-gaap_DebtConversionByUniqueDescriptionAxis
= cydy_ConvertibleNoteOneMember 		             
Minimum                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Exercisable warrants, exercise price $ 0.75us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_RangeAxis
= us-gaap_MinimumMember 		$ 0.75us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_RangeAxis
= us-gaap_MinimumMember 		             
Consulting agreement term       6 months          
Minimum | Convertible Note One                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Exercisable warrants, exercise price $ 1.50us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_DebtConversionByUniqueDescriptionAxis
= cydy_ConvertibleNoteOneMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember 		$ 1.50us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_DebtConversionByUniqueDescriptionAxis
= cydy_ConvertibleNoteOneMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember 		             
Maximum                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Exercisable warrants, exercise price $ 2.00us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_RangeAxis
= us-gaap_MaximumMember 		$ 2.00us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_RangeAxis
= us-gaap_MaximumMember 		             
Consulting agreement term       18 months          
Maximum | Convertible Note One                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Exercisable warrants, exercise price $ 2.00us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_DebtConversionByUniqueDescriptionAxis
= cydy_ConvertibleNoteOneMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember 		$ 2.00us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_DebtConversionByUniqueDescriptionAxis
= cydy_ConvertibleNoteOneMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember 		             
Director | Convertible Debt                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Cash proceeds from warrant exercises   733,333us-gaap_ProceedsFromWarrantExercises
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_DirectorMember 		             
Telecommunications services provided                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Exercisable warrants, exercise price       $ 0.75us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_NatureOfExpenseAxis
= cydy_CostOfServicesProvidedMember 		         
Number of warrants issued       50,000cydy_ClassOfWarrantOrRightIssuedInPeriod
/ us-gaap_NatureOfExpenseAxis
= cydy_CostOfServicesProvidedMember 		         
Exercisable warrants, expiry date       Nov. 01, 2016          
Grant date fair value of warrants       $ 0.67us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_NatureOfExpenseAxis
= cydy_CostOfServicesProvidedMember 		         
Third Party Consulting Firm and Scientific Advisor                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Warrants, termination date Dec. 08, 2019                
Number of tranches 3cydy_NumberOfTranchesForVestingOfWarrants
/ dei_LegalEntityAxis
= cydy_ThirdPartyConsultingFirmMember 		3cydy_NumberOfTranchesForVestingOfWarrants
/ dei_LegalEntityAxis
= cydy_ThirdPartyConsultingFirmMember 		             
Shares vested in each tranche 50,000cydy_NumberOfSharesVestedInEachTrancheOfWarrants
/ dei_LegalEntityAxis
= cydy_ThirdPartyConsultingFirmMember 		               
Third Party Consulting Firm and Scientific Advisor | Tranche 1                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Warrant vested and exercisable date Mar. 08, 2015                
Third Party Consulting Firm and Scientific Advisor | Tranche 2                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Warrant vested and exercisable date Sep. 08, 2015                
Third Party Consulting Firm and Scientific Advisor | Tranche 3                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Warrant vested and exercisable date Mar. 08, 2016                
Scientific advisor                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Shares of Common Stock issued upon exercise 100,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ dei_LegalEntityAxis
= cydy_ScientificAdvisorMember 		100,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ dei_LegalEntityAxis
= cydy_ScientificAdvisorMember 		             
Exercisable warrants, exercise price $ 1.15us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ dei_LegalEntityAxis
= cydy_ScientificAdvisorMember 		$ 1.15us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ dei_LegalEntityAxis
= cydy_ScientificAdvisorMember 		             
Warrants, termination date Dec. 08, 2019                
Scientific advisor | Tranche 1                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Warrant vested and exercisable date Apr. 08, 2015                
Warrants vested and become exercisable 33,334cydy_NumberOfWarrantsVestedAndExercisable
/ dei_LegalEntityAxis
= cydy_ScientificAdvisorMember
/ us-gaap_VestingAxis
= us-gaap_ShareBasedCompensationAwardTrancheOneMember 		               
Scientific advisor | Tranche 2                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Warrant vested and exercisable date Aug. 08, 2015                
Warrants vested and become exercisable 33,333cydy_NumberOfWarrantsVestedAndExercisable
/ dei_LegalEntityAxis
= cydy_ScientificAdvisorMember
/ us-gaap_VestingAxis
= us-gaap_ShareBasedCompensationAwardTrancheTwoMember 		               
Scientific advisor | Tranche 3                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Warrant vested and exercisable date Dec. 08, 2015                
Warrants vested and become exercisable 33,333cydy_NumberOfWarrantsVestedAndExercisable
/ dei_LegalEntityAxis
= cydy_ScientificAdvisorMember
/ us-gaap_VestingAxis
= us-gaap_ShareBasedCompensationAwardTrancheThreeMember 		               
Private Equity Offering                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Exercisable warrants, exercise price       $ 0.75us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_PrivatePlacementMember 		  $ 0.75us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_PrivatePlacementMember 		     
Number of common stock warrants issued       11,153,850cydy_StockIssuedDuringPeriodSharesCommonStockWarrants
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_PrivatePlacementMember 		         
Proceeds from units sold at private equity offering       14,500,000cydy_NetProceedsFromPrivatePlacementOffering
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_PrivatePlacementMember 		  14,500,000cydy_NetProceedsFromPrivatePlacementOffering
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_PrivatePlacementMember 		     
Purchase Price of warrant       1.30cydy_ClassOfWarrantOrRightPurchasePriceOfWarrantsOrRights
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_PrivatePlacementMember 		         
Number of common stock per unit       2cydy_NumberOfCommonStockPerUnit
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_PrivatePlacementMember 		  2cydy_NumberOfCommonStockPerUnit
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_PrivatePlacementMember 		     
Warrant to purchase common share       1us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_PrivatePlacementMember 		  1us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_PrivatePlacementMember 		     
Exercisable warrants, expire period       5 years          
Private Equity Offering | After amendment                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Exercisable warrants, exercise price       $ 0.75us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_StatementScenarioAxis
= cydy_AfterAmendmentMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_PrivatePlacementMember 		         
Grant date fair value of warrants       $ 1.03us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_StatementScenarioAxis
= cydy_AfterAmendmentMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_PrivatePlacementMember 		         
Number of common stock warrants issued       4,940,092cydy_StockIssuedDuringPeriodSharesCommonStockWarrants
/ us-gaap_StatementScenarioAxis
= cydy_AfterAmendmentMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_PrivatePlacementMember 		         
Exercisable warrants, expire period       7 years          
Stock Options | Consultant                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Stock options , shares granted       305,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cydy_ConsultantMember 		         
Stock options granted, exercise price       $ 0.75us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cydy_ConsultantMember 		         
Stock options, number of shares vested       50,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedNumberOfShares
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cydy_ConsultantMember 		         
Grant date fair value of options       $ 0.43us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cydy_ConsultantMember 		         
Stock options, expiration date       Sep. 04, 2018          
Stock options, number of shares vested monthly after initial issuance       15,000cydy_ShareBasedCompensationArrangementByShareBasedPaymentAwardMonthlyVestingShares
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cydy_ConsultantMember 		         
Cumulative number of options to purchase shares vested at the date of consulting agreement was terminated             140,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cydy_ConsultantMember 		   
Stock options to purchase, number of shares forfeited             150,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedOptionsForfeitedNumberOfShares
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cydy_ConsultantMember 		   
Stock Options | Options vested within notice period | Consultant                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Stock options, number of shares vested             15,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedNumberOfShares
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cydy_ConsultantMember
/ us-gaap_VestingAxis
= cydy_OptionsVestedWithinNoticePeriodMember 		   
2012 Equity Incentive Plan                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Shares of Common Stock issued upon exercise 325,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_PlanNameAxis
= cydy_TwoThousandTwelveStockIncentivePlanMember 		325,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_PlanNameAxis
= cydy_TwoThousandTwelveStockIncentivePlanMember 		             
Compensation expense related to stock options and warrants 161,400us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_PlanNameAxis
= cydy_TwoThousandTwelveStockIncentivePlanMember 		451,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_PlanNameAxis
= cydy_TwoThousandTwelveStockIncentivePlanMember 		784,400us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_PlanNameAxis
= cydy_TwoThousandTwelveStockIncentivePlanMember 		928,400us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_PlanNameAxis
= cydy_TwoThousandTwelveStockIncentivePlanMember 		3,262,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_PlanNameAxis
= cydy_TwoThousandTwelveStockIncentivePlanMember 		    298,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_PlanNameAxis
= cydy_TwoThousandTwelveStockIncentivePlanMember 		 
Grant date fair value of options 171,000cydy_ShareBasedCompensationArrangementByShareBasedPaymentAwardGrantDateFairValueOfOptions
/ us-gaap_PlanNameAxis
= cydy_TwoThousandTwelveStockIncentivePlanMember 		481,000cydy_ShareBasedCompensationArrangementByShareBasedPaymentAwardGrantDateFairValueOfOptions
/ us-gaap_PlanNameAxis
= cydy_TwoThousandTwelveStockIncentivePlanMember 		1,991,400cydy_ShareBasedCompensationArrangementByShareBasedPaymentAwardGrantDateFairValueOfOptions
/ us-gaap_PlanNameAxis
= cydy_TwoThousandTwelveStockIncentivePlanMember 		2,274,000cydy_ShareBasedCompensationArrangementByShareBasedPaymentAwardGrantDateFairValueOfOptions
/ us-gaap_PlanNameAxis
= cydy_TwoThousandTwelveStockIncentivePlanMember 		8,889,000cydy_ShareBasedCompensationArrangementByShareBasedPaymentAwardGrantDateFairValueOfOptions
/ us-gaap_PlanNameAxis
= cydy_TwoThousandTwelveStockIncentivePlanMember 		    417,000cydy_ShareBasedCompensationArrangementByShareBasedPaymentAwardGrantDateFairValueOfOptions
/ us-gaap_PlanNameAxis
= cydy_TwoThousandTwelveStockIncentivePlanMember 		 
Grant date fair value of warrants vested 171,000cydy_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueOfWarrantsIssued
/ us-gaap_PlanNameAxis
= cydy_TwoThousandTwelveStockIncentivePlanMember 		481,000cydy_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueOfWarrantsIssued
/ us-gaap_PlanNameAxis
= cydy_TwoThousandTwelveStockIncentivePlanMember 		1,991,400cydy_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueOfWarrantsIssued
/ us-gaap_PlanNameAxis
= cydy_TwoThousandTwelveStockIncentivePlanMember 		2,274,000cydy_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueOfWarrantsIssued
/ us-gaap_PlanNameAxis
= cydy_TwoThousandTwelveStockIncentivePlanMember 		8,889,000cydy_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueOfWarrantsIssued
/ us-gaap_PlanNameAxis
= cydy_TwoThousandTwelveStockIncentivePlanMember 		    417,000cydy_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueOfWarrantsIssued
/ us-gaap_PlanNameAxis
= cydy_TwoThousandTwelveStockIncentivePlanMember 		 
Unrecognized compensation costs $ 641,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_PlanNameAxis
= cydy_TwoThousandTwelveStockIncentivePlanMember 		$ 641,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_PlanNameAxis
= cydy_TwoThousandTwelveStockIncentivePlanMember 		  $ 752,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_PlanNameAxis
= cydy_TwoThousandTwelveStockIncentivePlanMember 		         
Weighted average period over which unrecognized compensation costs is expected to be recognized   1 year 2 months 12 days   1 year 10 months 21 days          
2012 Equity Incentive Plan | Third Party Consulting Firm and Scientific Advisor                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Shares of Common Stock issued upon exercise 150,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ dei_LegalEntityAxis
= cydy_ThirdPartyConsultingFirmMember
/ us-gaap_PlanNameAxis
= cydy_TwoThousandTwelveStockIncentivePlanMember 		150,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ dei_LegalEntityAxis
= cydy_ThirdPartyConsultingFirmMember
/ us-gaap_PlanNameAxis
= cydy_TwoThousandTwelveStockIncentivePlanMember 		             
Number of tranches 3cydy_NumberOfTranchesForVestingOfWarrants
/ dei_LegalEntityAxis
= cydy_ThirdPartyConsultingFirmMember
/ us-gaap_PlanNameAxis
= cydy_TwoThousandTwelveStockIncentivePlanMember 		3cydy_NumberOfTranchesForVestingOfWarrants
/ dei_LegalEntityAxis
= cydy_ThirdPartyConsultingFirmMember
/ us-gaap_PlanNameAxis
= cydy_TwoThousandTwelveStockIncentivePlanMember 		             
Shares vested in each tranche   50,000cydy_NumberOfSharesVestedInEachTrancheOfWarrants
/ dei_LegalEntityAxis
= cydy_ThirdPartyConsultingFirmMember
/ us-gaap_PlanNameAxis
= cydy_TwoThousandTwelveStockIncentivePlanMember 		             
Term of Warrants   5 years              
Number of milestone for warrant vesting 3cydy_NumberOfMilestonesForVestingOfWarrants
/ dei_LegalEntityAxis
= cydy_ThirdPartyConsultingFirmMember
/ us-gaap_PlanNameAxis
= cydy_TwoThousandTwelveStockIncentivePlanMember 		3cydy_NumberOfMilestonesForVestingOfWarrants
/ dei_LegalEntityAxis
= cydy_ThirdPartyConsultingFirmMember
/ us-gaap_PlanNameAxis
= cydy_TwoThousandTwelveStockIncentivePlanMember 		             
2012 Equity Incentive Plan | Third Party Consulting Firm and Scientific Advisor | Consultant One                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Exercisable warrants, exercise price $ 1.15us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
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2012 Equity Incentive Plan | Third Party Consulting Firm and Scientific Advisor | Consultant Two                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Exercisable warrants, exercise price $ 1.05us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
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2012 Equity Incentive Plan | Stock Options                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Shares available for future issuance       3,000,000us-gaap_DeferredCompensationArrangementWithIndividualSharesAuthorizedForIssuance
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Effective date of increase the number of shares future issuance   The effective date of the increase was subsequent to February 28, 2015              
Shares available for future stock-based grants 754,930us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
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2012 Equity Incentive Plan | Stock Options | Before Amendment                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Shares available for future issuance                 3,000,000us-gaap_DeferredCompensationArrangementWithIndividualSharesAuthorizedForIssuance
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2012 Equity Incentive Plan | Stock Options | After amendment                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Shares available for future issuance                 5,000,000us-gaap_DeferredCompensationArrangementWithIndividualSharesAuthorizedForIssuance
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2012 Equity Incentive Plan | Stock Options | Directors and Employee                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Stock options , shares granted   483,973us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
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/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
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Grant date fair value of options   $ 0.43us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
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2012 Equity Incentive Plan | Stock Options | Directors and Employee | Minimum                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Stock options granted, exercise price   $ 0.66us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
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/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cydy_DirectorsAndEmployeesMember 		  $ 0.64us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
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Grant date fair value of options       $ 0.40us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
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2012 Equity Incentive Plan | Stock Options | Directors and Employee | Maximum                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Stock options granted, exercise price   $ 0.81us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
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/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cydy_DirectorsAndEmployeesMember 		  $ 1.09us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
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= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
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/ us-gaap_RangeAxis
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= cydy_DirectorsAndEmployeesMember 		         
Grant date fair value of options       $ 0.43us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
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2012 Equity Incentive Plan | Stock Options | Director                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Percentage of option awards vesting       25.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
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/ us-gaap_PlanNameAxis
= cydy_TwoThousandTwelveStockIncentivePlanMember
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Stock options, term   5 years              
Grant date fair value of options   $ 0.35us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
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2012 Equity Incentive Plan | Stock Options | Employees                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Stock options, number of shares vested   50,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedNumberOfShares
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/ us-gaap_PlanNameAxis
= cydy_TwoThousandTwelveStockIncentivePlanMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cydy_EmployeesMember 		             
Stock options, vesting period   3 years              
Percentage of option awards vesting       33.33%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
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/ us-gaap_PlanNameAxis
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/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cydy_EmployeesMember 		         
Stock options, term   5 years   5 years          
2012 Equity Incentive Plan | Stock Options | Vesting Schedule One | Director                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Stock options, number of shares vested   333,973us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedNumberOfShares
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/ us-gaap_PlanNameAxis
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/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_DirectorMember
/ us-gaap_VestingAxis
= cydy_VestingScheduleOneMember 		             
Stock options, vesting period   1 year              
Percentage of option awards vesting   25.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
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2012 Equity Incentive Plan | Stock Options | Vesting Schedule Two | Director                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Stock options, number of shares vested   100,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedNumberOfShares
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/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_DirectorMember
/ us-gaap_VestingAxis
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Stock options, vesting period   2 years              
Percentage of option awards vesting   50.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
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2012 Equity Incentive Plan | Stock Options 2 | Director                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Stock options, vesting period       1 year