Share-Based Payments (Details 3) - Warrant [Member] - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended	12 Months Ended
	Jan. 31, 2016	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	$ 5.54
Weighted Average Exercise Price, Granted	0
Weighted Average Exercise Price, Exercised	0
Weighted Average Exercise Price, Expired	0
Weighted Average Exercise Price, Ending Balance	$ 5.54	$ 5.54
Weighted Average Remaining Contractual Life (Years), Balance	3 years 10 months 24 days	4 years 7 months 6 days
Aggregate Intrinsic Value, Beginning Balance	$ 3,764,871
Aggregate Intrinsic Value, Ending Balance	$ 0	$ 3,764,871