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Share-Based Payments (Details 2) (USD $)
 9 Months Ended 12 Months Ended
Jan. 31, 2014
Apr. 30, 2013
Shares, Outstanding, Beginning Balance 13,890,205  
Shares, Granted 8,850,000  
Shares, Exercised (15,000)  
Shares, Forfeited (65,000)  
Shares, Expired (26,250)  
Shares, Outstanding, Ending Balance 22,633,955 13,890,205
Shares, Vested and expected to vest 22,633,955  
Shares, Exercisable 13,612,495  
Weighted Average Exercise Price, Outstanding, Beginning Balance $ 0.85  
Weighted Average Exercise Price, Granted $ 1.23  
Weighted Average Exercise Price, Exercised $ 0.62  
Weighted Average Exercise Price, Forfeited $ 0.84  
Weighted Average Exercise Price, Expired $ 0.75  
Weighted Average Exercise Price, Outstanding, Ending Balance $ 1.00 $ 0.85
Weighted Average Exercise Price, Vested and expected to vest $ 1.00  
Weighted Average Exercise Price, Exercisable $ 0.85  
Weighted Average Remaining Contractual Life (Years), Outstanding 7 years 7 months 6 days 7 years
Weighted Average Remaining Contractual Life (Years), Granted 9 years 8 months 12 days  
Weighted Average Remaining Contractual Life (Years), Vested and expected to vest 7 years 7 months 6 days  
Weighted Average Remaining Contractual Life (Years), Exercisable 6 years 2 months 12 days  
Aggregate Intrinsic Value, Outstanding, Beginning Balance $ 89,000  
Aggregate Intrinsic Value, Granted 148,000  
Aggregate Intrinsic Value, Outstanding, Ending Balance 2,224,000 89,000
Aggregate Intrinsic Value, Vested and expected to vest 2,224,000  
Aggregate Intrinsic Value, Exercisable $ 2,132,000  
Non-Employees [Member]
    
Shares, Outstanding, Beginning Balance 765,000  
Shares, Granted 0  
Shares, Exercised 0  
Shares, Forfeited 0  
Shares, Expired 0  
Shares, Outstanding, Ending Balance 765,000  
Shares, Vested and expected to vest 765,000  
Shares, Exercisable 522,292  
Directors and Employees [Member]
    
Shares, Outstanding, Beginning Balance 13,125,205  
Shares, Granted 8,850,000  
Shares, Exercised (15,000)  
Shares, Forfeited (65,000)  
Shares, Expired (26,250)  
Shares, Outstanding, Ending Balance 21,868,955  
Shares, Vested and expected to vest 21,868,955  
Shares, Exercisable 13,090,203