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Summary of Significant Accounting Policies (Details 3) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 31, 2016 | Jan. 31, 2015 | Jan. 31, 2016 | Jan. 31, 2015 | Apr. 30, 2015 | Apr. 30, 2014
Basic loss per share computation |  |  |  |  |  |
Net loss attributable to common stockholders | $ (2,412,000) | $ (2,816,000) | $ (7,872,000) | $ (9,463,000) | $ (13,140,000) | $ (7,406,000)
Weighted Average common shares - basic (in shares) | 8,702,237 | 5,574,447 | 8,702,237 | 5,574,244 | 5,985,346 | 5,571,993
Basic net loss per share (in dollars per share) | $ (0.28) | $ (0.51) | $ (0.90) | $ (1.70) | $ (2.20) | $ (1.33)
Diluted loss per share computation |  |  |  |  |  |
Net loss attributable to common stockholders | $ (2,412,000) | $ (2,816,000) | $ (7,872,000) | $ (9,463,000) | $ (13,140,000) | $ (7,406,000)
Less: Gain on derivative warrant liability | 0 | 620,687 | 0 | 1,401,314 | 980,519 | 0
Loss available to common stockholders | $ (2,412,381) | $ (3,437,152) | $ (7,872,115) | $ (10,863,595) | $ (14,120,339) | $ (7,406,367)
Weighted Average common shares (in shares) | 8,702,237 | 5,574,447 | 8,702,237 | 5,574,244 | 5,985,346 | 5,571,993
Incremental shares from assumed exercise of warrants and stock options (in shares) | 0 | 29,351 | 0 | 29,351 | 439,065 | 0
Adjusted weighted average share - diluted (in shares) | 8,702,237 | 5,603,798 | 8,702,237 | 5,603,595 | 6,424,410 | 5,571,993
Diluted net loss per share (in dollars per shares) | $ (0.28) | $ (0.61) | $ (0.90) | $ (1.94) | $ (2.20) | $ (1.33)

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