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Stockholders' Equity - Schedule of Share-based Compensation, Stock Options, Activity (Details)
6 Months Ended
Oct. 31, 2015
USD ($)
$ / shares
shares
Share-Based Compensation Arrangement By Share-Based Payment Award Options Outstanding  
Shares outstanding, beginning of period | shares 125,746
Shares granted | shares 238,667
Shares expired | shares 36,996
Shares outstanding at end of period | shares 327,414
Shares exercisable at end of period | shares 279,414
Shares expected to vest at end of period | shares 327,414
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]  
Weighted average exercise price outstanding at beginning of period | $ / shares $ 8.48
Weighted average exercise price granted | $ / shares 1.63
Weighted average exercise price expired | $ / shares 12.71
Weighted average exercise price outstanding at end of period | $ / shares 3.01
Weighted average exercise price exercisable at end of period | $ / shares 3.27
Weighted average exercise price expected to vest at end of period | $ / shares $ 3.01
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]  
Weighted average remaining contractual life outstanding at beginning of period 3 years 7 months
Weighted average remaining contractual life granted 6 years 6 months
Weighted average remaining contractual life outstanding at end of period 3 years 4 months
Weighted average remaining contractual life exercisable at end of period 3 years 1 month
Weighted average remaining contractual life expected to vest at end of period 3 years 4 months
Aggregate intrinsic value outstanding at beginning of period | $ [1]
Aggregate intrinsic value outstanding at end of period | $ [1]
Aggregate intrinsic value exercisable at end of period | $ [1]
Aggregate intrinsic value expected to vest at end of period | $ [1]
[1] This amount represents the difference between the exercise price and $1.11, the closing price of Dataram common stock on October 31, 2015 as reported on the NASDAQ Stock Market, for all in-the-money options outstanding and all the in-the-money shares exercisable.