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Subsequent Events - Additional Information (Detail) (USD $)
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6 Months Ended |
0 Months Ended |
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Nov. 30, 2014
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Dec. 08, 2014
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| Subsequent Event [Line Items] |
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| Warrants to purchase common shares, shares |
250,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
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| Warrants exercise price per share |
0.50us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
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| Third party consulting firm |
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| Subsequent Event [Line Items] |
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| Warrants, termination date |
Dec. 08, 2019
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| Scientific advisor |
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| Subsequent Event [Line Items] |
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| Warrants, termination date |
Dec. 08, 2019
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| Tranche 1 | Third party consulting firm |
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| Subsequent Event [Line Items] |
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| Warrant vested and exercisable date |
Mar. 08, 2015
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| Tranche 1 | Scientific advisor |
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| Subsequent Event [Line Items] |
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| Warrant vested and exercisable date |
Apr. 08, 2015
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| Tranche 2 | Third party consulting firm |
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| Subsequent Event [Line Items] |
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| Warrant vested and exercisable date |
Sep. 08, 2015
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| Tranche 2 | Scientific advisor |
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| Subsequent Event [Line Items] |
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| Warrant vested and exercisable date |
Aug. 08, 2015
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| Tranche 3 | Third party consulting firm |
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| Subsequent Event [Line Items] |
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| Warrant vested and exercisable date |
Mar. 08, 2016
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| Tranche 3 | Scientific advisor |
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| Subsequent Event [Line Items] |
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| Warrant vested and exercisable date |
Dec. 08, 2015
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| Subsequent Event | Third party consulting firm |
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| Subsequent Event [Line Items] |
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| Warrants to purchase common shares, shares |
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150,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ dei_LegalEntityAxis
= cydy_ThirdPartyConsultingFirmMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
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| Warrants exercise price per share |
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$ 1.15us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ dei_LegalEntityAxis
= cydy_ThirdPartyConsultingFirmMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
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| Number of tranches for warrant vesting |
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3cydy_NumberOfTranchesForVestingOfWarrants
/ dei_LegalEntityAxis
= cydy_ThirdPartyConsultingFirmMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
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| Warrants vested in each trance |
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50,000cydy_NumberOfSharesVestedInEachTrancheOfWarrants
/ dei_LegalEntityAxis
= cydy_ThirdPartyConsultingFirmMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
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| Subsequent Event | Scientific advisor |
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| Subsequent Event [Line Items] |
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| Warrants to purchase common shares, shares |
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100,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ dei_LegalEntityAxis
= cydy_ScientificAdvisorMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
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| Warrants exercise price per share |
|
$ 1.15us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ dei_LegalEntityAxis
= cydy_ScientificAdvisorMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
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| Subsequent Event | Tranche 1 | Scientific advisor |
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| Subsequent Event [Line Items] |
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| Warrants vested and become exercisable |
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33,334cydy_NumberOfWarrantsVestedAndExercisable
/ dei_LegalEntityAxis
= cydy_ScientificAdvisorMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ us-gaap_VestingAxis
= us-gaap_ShareBasedCompensationAwardTrancheOneMember
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| Subsequent Event | Tranche 2 | Scientific advisor |
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| Subsequent Event [Line Items] |
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| Warrants vested and become exercisable |
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33,333cydy_NumberOfWarrantsVestedAndExercisable
/ dei_LegalEntityAxis
= cydy_ScientificAdvisorMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ us-gaap_VestingAxis
= us-gaap_ShareBasedCompensationAwardTrancheTwoMember
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| Subsequent Event | Tranche 3 | Scientific advisor |
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| Subsequent Event [Line Items] |
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| Warrants vested and become exercisable |
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33,333cydy_NumberOfWarrantsVestedAndExercisable
/ dei_LegalEntityAxis
= cydy_ScientificAdvisorMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ us-gaap_VestingAxis
= us-gaap_ShareBasedCompensationAwardTrancheThreeMember
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