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Summary of Significant Accounting Policies (Details 3) - USD ($)
 12 Months Ended
Apr. 30, 2015
Apr. 30, 2014
Basic loss per share computation    
Net loss attributable to common stockholders $ (13,140,000) $ (7,406,000)
Weighted Average common shares - basic (in shares) 71,824,146 66,863,915
Basic net loss per share (in dollars per share) $ (0.18) $ (0.11)
Diluted loss per share computation    
Net loss attributable to common stockholders $ (13,140,000) $ (7,406,000)
Less: Gain on derivative warrant liability 980,519 0
Loss available to common stockholders $ (14,120,339) $ (7,406,367)
Weighted Average common shares (in shares) 71,824,146 66,863,915
Incremental shares from assumed exercise of warrants and stock options 5,268,777 0
Adjusted weighted average share - diluted (in shares) 77,092,923 66,863,915
Diluted net loss per share (in dollars per shares) $ (0.18) $ (0.11)