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Quarterly report pursuant to Section 13 or 15(d)

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

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Stockholders' Equity (Deficiency) (Schedule of Stock Options Activity) (Details) - USD ($)
3 Months Ended 12 Months Ended
Jun. 08, 2015
Jul. 31, 2015
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   2,000,000  
Exercised      
Forfeited   (504,099)  
Expired      
Balance Outstanding   15,702,313 14,206,412
Exercisable   5,769,272  
Weighted Average Exercise Price      
Balance Outstanding   $ 0.21  
Weighted average exercise price of options granted   $ 0.17  
Exercised      
Forfeited   $ 0.35  
Expired      
Balance Outstanding   $ 0.20 $ 0.21
Exercisable   $ 0.23  
Weighted Average Remaining Contractual Term      
SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2   3 years 2 months 12 days 3 years 6 months
Granted   4 years 10 months 24 days  
Forfeited   2 years 2 months 12 days  
SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2   3 years 2 months 12 days 3 years 6 months
Exercisable   2 years 4 months 24 days  
Aggregate Intrinsic Value      
Balance Outstanding   $ 103,000  
Granted      
Forfeited      
Balance Outstanding   $ 147,000 $ 103,000
Exercisable   $ 4,000  
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   $ 0.30  
Weighted average exercise price of options granted      
Exercised      
Forfeited   $ 0.19  
Expired      
Balance Outstanding   $ 0.31 $ 0.30
Exercisable   $ 0.31  
Weighted Average Remaining Contractual Term      
SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2   1 year 8 months 12 days 2 years 1 month 6 days
Granted      
Forfeited   3 years  
SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2   1 year 8 months 12 days 2 years 1 month 6 days
Exercisable   1 year 8 months 12 days  
Aggregate Intrinsic Value      
Balance Outstanding      
Granted      
Forfeited      
Balance Outstanding      
Exercisable