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Organization, Use of Estimates and Basis of Presentation (Details) - USD ($)
 3 Months Ended
Jul. 31, 2015
Jul. 31, 2014
Basic loss per share computation    
Net loss attributable to common stockholders $ (2,913,000) $ (3,548,000)
Weighted Average common shares - basic (in shares) 8,702,237 5,573,822
Basic net loss per share (in dollars per share) $ (0.33) $ (0.64)
Diluted loss per share computation    
Net loss attributable to common stockholders $ (2,913,000) $ (3,548,000)
Less: Gain on derivative warrant liability 0 155,634
Loss available to common stockholders $ (2,913,101) $ (3,703,517)
Weighted Average common shares (in shares) 8,702,237 5,573,822
Incremental shares from assumed exercise of warrants and stock options 0 245,739
Adjusted weighted average share - diluted (in shares) 8,702,237 5,819,561
Diluted net loss per share (in dollars per shares) $ (0.33) $ (0.64)