Quarterly report pursuant to Section 13 or 15(d)

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 3 Months Ended
Feb. 28, 2015
Feb. 28, 2015
Feb. 28, 2014
Feb. 28, 2014
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Warrants exercise price per share $ 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    
Interest expense associated with conversion and exercise inducement 202,295us-gaap_InducedConversionOfConvertibleDebtExpense 555,628us-gaap_InducedConversionOfConvertibleDebtExpense 193,160us-gaap_InducedConversionOfConvertibleDebtExpense    
Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Warrants exercise price per share $ 0.75us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_RangeAxis
= us-gaap_MinimumMember 		$ 0.75us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_RangeAxis
= us-gaap_MinimumMember 		     
Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Warrants exercise price per share $ 2.00us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_RangeAxis
= us-gaap_MaximumMember 		$ 2.00us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_RangeAxis
= us-gaap_MaximumMember 		     
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 		     
Warrants exercise price per share $ 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 Debt | Director          
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 		     
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 		     
Warrants exercise price per share $ 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 		       
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 		     
Warrants exercise price per share $ 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 		     
Convertible Note One | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Warrants exercise price per share $ 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 		     
Convertible Note One | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Warrants exercise price per share $ 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 		     
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 		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 		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 		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 		     
Weighted average period over which unrecognized compensation costs is expected to be recognized   1 year 2 months 12 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]          
Warrants exercise price per share $ 1.15us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ dei_LegalEntityAxis
= cydy_ThirdPartyConsultingFirmMember
/ us-gaap_PlanNameAxis
= cydy_TwoThousandTwelveStockIncentivePlanMember
/ us-gaap_TitleOfIndividualAxis
= cydy_ConsultantOneMember 		$ 1.15us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ dei_LegalEntityAxis
= cydy_ThirdPartyConsultingFirmMember
/ us-gaap_PlanNameAxis
= cydy_TwoThousandTwelveStockIncentivePlanMember
/ us-gaap_TitleOfIndividualAxis
= cydy_ConsultantOneMember 		     
2012 Equity Incentive Plan | Third Party Consulting Firm and Scientific Advisor | Consultant Two          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Warrants exercise price per share $ 1.05us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ dei_LegalEntityAxis
= cydy_ThirdPartyConsultingFirmMember
/ us-gaap_PlanNameAxis
= cydy_TwoThousandTwelveStockIncentivePlanMember
/ us-gaap_TitleOfIndividualAxis
= cydy_ConsultantTwoMember 		$ 1.05us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ dei_LegalEntityAxis
= cydy_ThirdPartyConsultingFirmMember
/ us-gaap_PlanNameAxis
= cydy_TwoThousandTwelveStockIncentivePlanMember
/ us-gaap_TitleOfIndividualAxis
= cydy_ConsultantTwoMember 		     
2012 Equity Incentive Plan | Stock Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
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
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= cydy_TwoThousandTwelveStockIncentivePlanMember 		754,930us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= cydy_TwoThousandTwelveStockIncentivePlanMember 		     
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
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ cydy_EquityIncentivePlanAxis
= cydy_BeforeAmendmentMember
/ us-gaap_PlanNameAxis
= cydy_TwoThousandTwelveStockIncentivePlanMember
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
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ cydy_EquityIncentivePlanAxis
= cydy_AfterAmendmentMember
/ us-gaap_PlanNameAxis
= cydy_TwoThousandTwelveStockIncentivePlanMember
2012 Equity Incentive Plan | Stock Options | Directors and Employee          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock options granted, shares   483,973us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= cydy_TwoThousandTwelveStockIncentivePlanMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cydy_DirectorsAndEmployeesMember 		     
Stock options grant date fair value   $ 0.43us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= cydy_TwoThousandTwelveStockIncentivePlanMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cydy_DirectorsAndEmployeesMember 		     
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
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= cydy_TwoThousandTwelveStockIncentivePlanMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cydy_DirectorsAndEmployeesMember 		     
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
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= cydy_TwoThousandTwelveStockIncentivePlanMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cydy_DirectorsAndEmployeesMember 		     
2012 Equity Incentive Plan | Stock Options | Director          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock options, term   5 years      
Stock options grant date fair value   $ 0.35us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= cydy_TwoThousandTwelveStockIncentivePlanMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_DirectorMember 		     
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
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= cydy_TwoThousandTwelveStockIncentivePlanMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cydy_EmployeesMember 		     
Stock options, vesting period   3 years      
Stock options, term   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
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= cydy_TwoThousandTwelveStockIncentivePlanMember
/ 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
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= cydy_TwoThousandTwelveStockIncentivePlanMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_DirectorMember
/ us-gaap_VestingAxis
= cydy_VestingScheduleOneMember 		     
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
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= cydy_TwoThousandTwelveStockIncentivePlanMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_DirectorMember
/ us-gaap_VestingAxis
= cydy_VestingScheduleTwoMember 		     
Stock options, vesting period   2 years      
Percentage of option awards vesting   50.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= cydy_TwoThousandTwelveStockIncentivePlanMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_DirectorMember
/ us-gaap_VestingAxis
= cydy_VestingScheduleTwoMember