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Share-Based Payments (Details 4) (Warrant [Member], USD $)
In Thousands, except Share data, unless otherwise specified
 6 Months Ended 12 Months Ended
Oct. 31, 2013
Apr. 30, 2013
Warrant [Member]
    
Number of Shares, Beginning Balance 3,276,667  
Number of Shares, Granted 0  
Number of Shares, Exercised 0  
Number of Shares, Expired 0  
Number of Shares, Ending Balance 3,276,667 3,276,667
Weighted Average Exercise Price, Beginning Balance $ 0.61  
Weighted Average Exercise Price, Granted $ 0  
Weighted Average Exercise Price, Exercised $ 0  
Weighted Average Exercise Price, Expired $ 0  
Weighted Average Exercise Price, Ending Balance $ 0.61 $ 0.61
Weighted Average Remaining Contractual Life (Years) 3 years 4 months 24 days 3 years 10 months 24 days
Aggregate Intrinsic Value, Beginning Balance $ 0  
Aggregate Intrinsic Value, Ending Balance $ 2,215,967 $ 0