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

Private Equity Offering - Additional Information (Detail)

v2.4.1.9
Private Equity Offering - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
0 Months Ended 12 Months Ended
Oct. 23, 2013
May 31, 2014
Feb. 28, 2015
Equity and Equity Units Offering Disclosure [Line Items]      
Exercisable warrants, exercise price     $ 0.50us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Private Equity Offering      
Equity and Equity Units Offering Disclosure [Line Items]      
Units sold at private equity offering 11,153,850us-gaap_PartnersCapitalAccountUnitsSaleOfUnits
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_PrivatePlacementMember
   
Price per unit $ 1.30us-gaap_SaleOfStockPricePerShare
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_PrivatePlacementMember
   
Proceeds from units sold at private equity offering $ 14.5cydy_NetProceedsFromPrivatePlacementOffering
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_PrivatePlacementMember
$ 14.5cydy_NetProceedsFromPrivatePlacementOffering
/ 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
 
Number of shares issued   20,989,494us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ 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, 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