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Share-Based Payments (Details 3) - Warrant [Member] - USD ($)
$ / shares in Units, $ in Thousands
 6 Months Ended 12 Months Ended
Oct. 31, 2015
Apr. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of Shares, Beginning Balance 2,109,840  
Number of Shares, Granted 0  
Number of Shares, Exercised 0  
Number of Shares, Expired 0  
Number of Shares, Ending Balance 2,109,840 2,109,840
Weighted Average Exercise Price, Beginning Balance $ 5.82  
Weighted Average Exercise Price, Granted 0  
Weighted Average Exercise Price, Exercised 0  
Weighted Average Exercise Price, Expired 0  
Weighted Average Exercise Price, Ending Balance $ 5.82 $ 5.82
Weighted Average Remaining Contractual Life (Years), Balance 4 years 1 month 6 days 4 years 7 months 6 days
Aggregate Intrinsic Value, Beginning Balance $ 3,247,604  
Aggregate Intrinsic Value, Ending Balance $ 153,578 $ 3,247,604