Quarterly report pursuant to Section 13 or 15(d)

Stock Options and Warrants (Detail)

v2.4.1.9
Stock Options and Warrants (Detail) (USD $)
 6 Months Ended 12 Months Ended
Nov. 30, 2014
May 31, 2014
Stock option and warrant activity    
Options and warrants outstanding, Number of Shares 30,806,361cydy_StockOptionsAndWarrantsOutstandingNumbers  
Granted, Number of Shares 883,973cydy_StockOptionsAndWarrantsGrantsInPeriod  
Exercised, Number of Shares (1,413,333)cydy_StockOptionsAndWarrantsExercisedInPeriod  
Forfeited /expired/ cancelled, Number of Shares (6,523,843)cydy_StockOptionsAndWarrantsForfeituresAndExpirationsInPeriod  
Options and warrants outstanding, Number of Shares 23,753,158cydy_StockOptionsAndWarrantsOutstandingNumbers 30,806,361cydy_StockOptionsAndWarrantsOutstandingNumbers
Outstanding exercisable - Number of Shares 22,108,780cydy_StockOptionsAndWarrantsOutstandingExercisableNumber  
Options and warrants outstanding, Weighted Average Exercise Price $ 1.13cydy_StockOptionsAndWarrantsOutstandingWeightedAverageExercisePrice  
Granted, Weighted Average Exercise Price $ 0.76cydy_StockOptionsAndWarrantsGrantsInPeriodWeightedAverageExercisePrice  
Exercised, Weighted Average Exercise Price $ 0.55cydy_StockOptionsAndWarrantsExercisedInPeriodWeightedAverageExercisePrice  
Forfeited/expired/cancelled, Weighted Average Exercise Price $ 1.76cydy_StockOptionsAndWarrantsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice  
Options and warrants outstanding, Weighted Average Exercise Price $ 0.89cydy_StockOptionsAndWarrantsOutstandingWeightedAverageExercisePrice $ 1.13cydy_StockOptionsAndWarrantsOutstandingWeightedAverageExercisePrice
Outstanding exercisable, Weighted Average Exercise Price $ 0.90cydy_StockOptionsAndWarrantsOutstandingExercisableWeightedAverageExercisePrice  
Options and warrants outstanding, Weighted Average Remaining Contractual Life 3 years 9 months 29 days 3 years 3 months 15 days
Outstanding exercisable, Weighted Average Remaining Contractual Life 3 years 9 months 26 days  
Options and warrants outstanding , Aggregate Intrinsic Value $ 10,302,869cydy_StockOptionsAndWarrantsOutstandingAggregateIntrinsicValue $ 177,042cydy_StockOptionsAndWarrantsOutstandingAggregateIntrinsicValue
Exercisable , Aggregate Intrinsic Value $ 9,615,260cydy_StockOptionsAndWarrantsOutstandingExercisableAggregateIntrinsicValue