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Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity (Schedule of Stock Options Activity) (Details)

v3.5.0.2
Stockholders' Equity (Schedule of Stock Options Activity) (Details) - USD ($)
12 Months Ended
Jun. 08, 2015
Apr. 30, 2016
Apr. 30, 2015
Weighted Average Exercise Price      
Weighted average exercise price of options granted $ 0.168    
Stock Incentive Plan and Stock Option Grants to Employees and Directors [Member]      
Number of Shares      
Balance Outstanding   14,206,412  
Granted   5,215,000  
Exercised    
Forfeited   (1,490,310)  
Expired    
Balance Outstanding   17,931,102 14,206,412
Exercisable   7,162,464  
Weighted Average Exercise Price      
Balance Outstanding   $ 0.21  
Weighted average exercise price of options granted   0.17  
Exercised    
Forfeited   0.38  
Expired    
Balance Outstanding   0.19 $ 0.21
Exercisable   $ 0.22  
Weighted Average Remaining Contractual Term      
Balance Outstanding   3 years 3 months 18 days 3 years 5 months 12 days
Granted   5 years 9 months 18 days  
Forfeited   2 years 7 months 6 days  
Exercisable   1 year 10 months 24 days  
Aggregate Intrinsic Value      
Balance Outstanding   $ 103,000  
Granted    
Forfeited    
Balance Outstanding   25,760 $ 103,000
Exercisable   $ 4,333  
Stock Option Grants To Non-Employees [Member]      
Number of Shares      
Balance Outstanding   220,000  
Granted    
Exercised    
Forfeited   (25,000)  
Expired    
Balance Outstanding   195,000 220,000
Exercisable   195,000  
Weighted Average Exercise Price      
Balance Outstanding   $ 0.3  
Weighted average exercise price of options granted    
Exercised    
Forfeited   0.19  
Expired    
Balance Outstanding   0.29 $ 0.3
Exercisable   $ 0.29  
Weighted Average Remaining Contractual Term      
Balance Outstanding   10 months 24 days 2 years 1 month 6 days
Forfeited   3 years  
Exercisable   10 months 24 days  
Aggregate Intrinsic Value      
Balance Outstanding    
Granted    
Forfeited    
Balance Outstanding  
Exercisable