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Related Party Transactions - Additional Information (Detail) (USD $)
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9 Months Ended |
12 Months Ended |
0 Months Ended |
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Feb. 28, 2015
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Feb. 28, 2014
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May 31, 2014
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Feb. 06, 2015
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Sep. 26, 2014
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| Related Party Transaction [Line Items] |
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| Face amount of notes |
$ 0cydy_ConvertibleNotesFaceAmount
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$ 1,200,000cydy_ConvertibleNotesFaceAmount
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| Debt conversion price |
$ 0.75us-gaap_DebtInstrumentConvertibleConversionPrice1
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| Exercise price of warrants, per share |
$ 0.50us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
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| Convertible notes issued, principal amount |
1,175,000us-gaap_DebtConversionConvertedInstrumentAmount1
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2,459,000us-gaap_DebtConversionConvertedInstrumentAmount1
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2,450,000us-gaap_DebtConversionConvertedInstrumentAmount1
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| Proceeds from exercise of warrants |
1,066,436us-gaap_ProceedsFromWarrantExercises
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50,000us-gaap_ProceedsFromWarrantExercises
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| Convertible Debt |
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| Related Party Transaction [Line Items] |
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| Proceeds from exercise of warrants |
1,066,000us-gaap_ProceedsFromWarrantExercises
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
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| Alpha Venture Capital Partners, L.P. |
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| Related Party Transaction [Line Items] |
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| Face amount of notes |
3,500,000cydy_ConvertibleNotesFaceAmount
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cydy_AlphaVentureCapitalPartnersLPMember
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1,500,000cydy_ConvertibleNotesFaceAmount
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cydy_AlphaVentureCapitalPartnersLPMember
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2,000,000cydy_ConvertibleNotesFaceAmount
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cydy_AlphaVentureCapitalPartnersLPMember
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| Interest rate on convertible notes |
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1.20%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cydy_AlphaVentureCapitalPartnersLPMember
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5.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cydy_AlphaVentureCapitalPartnersLPMember
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| Convertible note maturity date |
Sep. 26, 2016
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May 05, 2015
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Sep. 26, 2016
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| Debt conversion price |
$ 1.00us-gaap_DebtInstrumentConvertibleConversionPrice1
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cydy_AlphaVentureCapitalPartnersLPMember
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$ 1.00us-gaap_DebtInstrumentConvertibleConversionPrice1
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cydy_AlphaVentureCapitalPartnersLPMember
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$ 1.00us-gaap_DebtInstrumentConvertibleConversionPrice1
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cydy_AlphaVentureCapitalPartnersLPMember
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| Percentage reduction to conversion price |
10.00%cydy_PercentageOfCurrentConversionPriceLowerThanClosingSalePrice
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cydy_AlphaVentureCapitalPartnersLPMember
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10.00%cydy_PercentageOfCurrentConversionPriceLowerThanClosingSalePrice
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cydy_AlphaVentureCapitalPartnersLPMember
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10.00%cydy_PercentageOfCurrentConversionPriceLowerThanClosingSalePrice
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cydy_AlphaVentureCapitalPartnersLPMember
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| Sale price of common stock |
$ 0.9444us-gaap_SharePrice
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cydy_AlphaVentureCapitalPartnersLPMember
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$ 0.9444us-gaap_SharePrice
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cydy_AlphaVentureCapitalPartnersLPMember
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$ 0.9444us-gaap_SharePrice
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cydy_AlphaVentureCapitalPartnersLPMember
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| Additional convertible promissory notes that may be issued |
6,000,000cydy_AdditionalDebtInstrumentFaceAmountThatMayBeIssued
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cydy_AlphaVentureCapitalPartnersLPMember
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6,000,000cydy_AdditionalDebtInstrumentFaceAmountThatMayBeIssued
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cydy_AlphaVentureCapitalPartnersLPMember
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6,000,000cydy_AdditionalDebtInstrumentFaceAmountThatMayBeIssued
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cydy_AlphaVentureCapitalPartnersLPMember
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| Warrants to purchase common shares, shares |
325,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cydy_AlphaVentureCapitalPartnersLPMember
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| Exercise price of warrants, per share |
$ 0.50us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cydy_AlphaVentureCapitalPartnersLPMember
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$ 0.50us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cydy_AlphaVentureCapitalPartnersLPMember
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$ 0.50us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cydy_AlphaVentureCapitalPartnersLPMember
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| Alpha Venture Capital Partners, L.P. | Detachable common stock warrants with a two-year term |
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| Related Party Transaction [Line Items] |
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| Warrants to purchase common shares, shares |
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250,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_ClassOfWarrantOrRightAxis
= cydy_WarrantOneMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cydy_AlphaVentureCapitalPartnersLPMember
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| Warrants, expiration date |
Dec. 31, 2019
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| Alpha Venture Capital Partners, L.P. | Detachable common stock warrants, with terms of two or three years |
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| Related Party Transaction [Line Items] |
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| Warrants to purchase common shares, shares |
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75,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_ClassOfWarrantOrRightAxis
= cydy_WarrantTwoMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cydy_AlphaVentureCapitalPartnersLPMember
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| Warrants, expiration date |
Feb. 28, 2020
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| Director | Convertible Debt |
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| Related Party Transaction [Line Items] |
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| Convertible notes issued, principal amount |
1,000,000us-gaap_DebtConversionConvertedInstrumentAmount1
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_DirectorMember
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| Common stock warrants issued |
1,333,333us-gaap_ClassOfWarrantOrRightOutstanding
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_DirectorMember
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| Proceeds from exercise of warrants |
$ 733,333us-gaap_ProceedsFromWarrantExercises
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_DirectorMember
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| Convertible notes term |
3 years
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