Quarterly report pursuant to Section 13 or 15(d)

Acquisition of Patents - Additional Information (Detail)

v2.4.1.9
Acquisition of Patents - Additional Information (Detail) (USD $)
 0 Months Ended 3 Months Ended 9 Months Ended
Oct. 16, 2012
Feb. 28, 2015
Feb. 28, 2014
Feb. 28, 2015
Feb. 28, 2014
Acquired Finite-Lived Intangible Assets [Line Items]          
Asset purchase, cash paid $ 3,500,000us-gaap_PaymentsToAcquireIntangibleAssets        
Intangible asset acquired   3,500,000us-gaap_FiniteLivedPatentsGross   3,500,000us-gaap_FiniteLivedPatentsGross  
Accrued liabilities related to contingent payments   0us-gaap_BusinessCombinationContingentConsiderationLiability   0us-gaap_BusinessCombinationContingentConsiderationLiability  
Estimated aggregate future amortization expense in year one   350,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths   350,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths  
Estimated aggregate future amortization expense in year two   350,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo   350,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo  
Estimated aggregate future amortization expense in year three   350,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree   350,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree  
Estimated aggregate future amortization expense in year four   350,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour   350,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour  
Estimated aggregate future amortization expense in year five   350,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive   350,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive  
Estimated aggregate future amortization expense in year six   350,000cydy_FiniteLivedIntangibleAssetsAmortizationExpenseYearSix   350,000cydy_FiniteLivedIntangibleAssetsAmortizationExpenseYearSix  
Estimated aggregate future amortization expense in year seven   350,000cydy_FiniteLivedIntangibleAssetsAmortizationExpenseYearSeven   350,000cydy_FiniteLivedIntangibleAssetsAmortizationExpenseYearSeven  
Estimated aggregate future amortization expense in year eight   219,000cydy_FiniteLivedIntangibleAssetsAmortizationExpenseYearEight   219,000cydy_FiniteLivedIntangibleAssetsAmortizationExpenseYearEight  
Patents          
Acquired Finite-Lived Intangible Assets [Line Items]          
Asset purchase, cash paid 3,500,000us-gaap_PaymentsToAcquireIntangibleAssets
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_PatentsMember 		       
Remaining approximate life       8 years  
Amortization expense related to patents   $ 87,500us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_PatentsMember 		$ 87,500us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_PatentsMember 		$ 262,500us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_PatentsMember 		$ 262,500us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_PatentsMember