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Organization, Use of Estimates and Basis of Presentation (Details) - USD ($)
 3 Months Ended 6 Months Ended
Oct. 31, 2015
Oct. 31, 2014
Oct. 31, 2015
Oct. 31, 2014
Basic loss per share computation        
Net loss attributable to common stockholders $ (2,548,000) $ (3,078,000) $ (5,461,000) $ (6,684,000)
Weighted Average common shares - basic (in shares) 8,702,237 5,573,944 8,702,237 5,573,853
Basic net loss per share (in dollars per share) $ (0.29) $ (0.55) $ (0.63) $ (1.20)
Diluted loss per share computation        
Net loss attributable to common stockholders $ (2,548,000) $ (3,078,000) $ (5,461,000) $ (6,684,000)
Less: Gain on derivative warrant liability 0 624,993 0 780,627
Loss available to common stockholders $ (2,548,000) $ (3,702,993) $ (5,461,000) $ (7,464,627)
Weighted Average common shares (in shares) 8,702,237 5,573,944 8,702,237 5,573,853
Incremental shares from assumed exercise of warrants and stock options 0 80,666 0 80,666
Adjusted weighted average share - diluted (in shares) 8,702,237 5,654,610 8,702,237 5,654,519
Diluted net loss per share (in dollars per shares) $ (0.29) $ (0.65) $ (0.63) $ (1.32)