Quarterly report pursuant to Section 13 or 15(d)

Stock Options and Warrants (Detail)

v2.4.1.9
Stock Options and Warrants (Detail) (USD $)
 9 Months Ended 12 Months Ended
Feb. 28, 2015
May 31, 2014
Stock option and warrant activity    
Options and warrants outstanding, Number of Shares 30,806,361cydy_StockOptionsAndWarrantsOutstandingNumbers  
Granted, Number of Shares 1,208,973cydy_StockOptionsAndWarrantsGrantsInPeriod  
Exercised, Number of Shares (1,938,974)cydy_StockOptionsAndWarrantsExercisedInPeriod  
Forfeited /expired/ cancelled, Number of Shares (7,020,410)cydy_StockOptionsAndWarrantsForfeituresAndExpirationsInPeriod  
Options and warrants outstanding, Number of Shares 23,055,950cydy_StockOptionsAndWarrantsOutstandingNumbers 30,806,361cydy_StockOptionsAndWarrantsOutstandingNumbers
Outstanding exercisable - Number of Shares 21,476,679cydy_StockOptionsAndWarrantsOutstandingExercisableNumber  
Options and warrants outstanding, Weighted Average Exercise Price $ 1.13cydy_StockOptionsAndWarrantsOutstandingWeightedAverageExercisePrice  
Granted, Weighted Average Exercise Price $ 0.67cydy_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 $ 0.86cydy_StockOptionsAndWarrantsOutstandingWeightedAverageExercisePrice $ 1.13cydy_StockOptionsAndWarrantsOutstandingWeightedAverageExercisePrice
Outstanding exercisable, Weighted Average Exercise Price $ 0.86cydy_StockOptionsAndWarrantsOutstandingExercisableWeightedAverageExercisePrice  
Options and warrants outstanding, Weighted Average Remaining Contractual Life 3 years 8 months 23 days 3 years 3 months 15 days
Outstanding exercisable, Weighted Average Remaining Contractual Life 3 years 8 months 19 days  
Options and warrants outstanding , Aggregate Intrinsic Value $ 2,151,361cydy_StockOptionsAndWarrantsOutstandingAggregateIntrinsicValue $ 177,042cydy_StockOptionsAndWarrantsOutstandingAggregateIntrinsicValue
Exercisable , Aggregate Intrinsic Value $ 2,027,111cydy_StockOptionsAndWarrantsOutstandingExercisableAggregateIntrinsicValue