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Share-Based Payments (Details 3) - Warrant [Member] - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Apr. 30, 2015
Apr. 30, 2014
Apr. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of Shares, Beginning Balance 3,276,667 3,276,667  
Number of Shares, Granted 22,191,415 0  
Number of Shares, Exercised 0 0  
Number of Shares, Forfeited 0 0  
Number of Shares, Expired (150,000) 0  
Number of Shares, Ending Balance 25,318,082 3,276,667 3,276,667
Weighted Average Exercise Price, Beginning Balance $ 0.61 $ 0.61  
Weighted Average Exercise Price, Granted 0.47 0  
Weighted Average Exercise Price, Exercised 0 0  
Weighted Average Exercise Price, Forfeited 0 0  
Weighted Average Exercise Price, Expired 0 0  
Weighted Average Exercise Price, Ending Balance $ 0.49 $ 0.61 $ 0.61
Weighted Average Remaining Contractual Life (Years), Balance 4 years 7 months 6 days 2 years 10 months 24 days 3 years 10 months 24 days
Weighted Average Remaining Contractual Life (Years), Granted 4 years 10 months 24 days    
Aggregate Intrinsic Value, Beginning Balance $ 984,333 $ 0  
Aggregate Intrinsic Value, Granted 3,108,271    
Aggregate Intrinsic Value, Ending Balance $ 3,247,604 $ 984,333 $ 0