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Common Stock and Stock Purchase Warrants (Details Textual) - USD ($) |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Mar. 11, 2015 | Dec. 01, 2014 | Feb. 28, 2015 | Jan. 28, 2013 | Mar. 24, 2011 | Apr. 30, 2015 | Apr. 30, 2014
Stock Issued During Period, Shares, Acquisitions |  |  |  | 18,600,000 | 12,533,333 |  |
Common Stock Purchase Price |  |  |  | $ 0.50 | $ 0.75 |  |
Stock Issued During Period, Value, Share-based Compensation, Gross |  |  |  | $ 9,300,000 | $ 9,400,000 |  |
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures |  |  |  | 500,000 | $ 500,000 |  |
Issuance of Additional Common Shares to Investors |  |  |  |  |  | 17,617,929 |
Proceeds from Issuance of Common Stock and Warrants |  |  |  | $ 9,100,000 |  |  |
Estimated Fair Value of Warrants | $ 1,600,000 |  |  |  |  |  | $ 2,000,000
Repurchase Of Stock In Put Option |  |  |  |  |  | $ 0.40 |
Common Stock, Shares Authorized |  |  |  |  |  | 200,000,000 | 125,000,000
Warrant Modification Charge |  |  |  |  |  | $ 586,000 | $ 0
Securities Purchase Agreement 2011 [Member] |  |  |  |  |  |  |
Warrants Exercise Price Per Share |  |  |  |  | $ 0.40 |  |
Stock Issued During Period, Shares, New Issues |  |  |  |  | 2,264,450 |  |
Additional Warrants Issued To Investors |  |  |  |  | 1,583,335 |  |
Warrant Modification Charge |  |  |  |  | $ 413,521 |  |
Securities Purchase Agreement 2013 [Member] |  |  |  |  |  |  |
Warrants Exercise Price Per Share |  |  |  | $ 0.40 |  |  |
Additional Warrants Issued To Investors |  |  |  | 1,209,001 |  |  |
Warrant Modification Charge |  |  |  | $ 172,344 |  |  |
Securities Purchase Agreement 2015 [Member] |  |  |  |  |  |  |
Debt Conversion, Original Debt, Amount | $ 100,000 |  |  |  |  |  |
Unit Description | each unit consisting of one share of the Company's Common Stock, par value $0.001 per share (the "Common Stock") and a warrant to buy 0.55 shares of Common Stock at $0.48 per share (the "Warrants"), at a purchase price of $0.40 per unit, for an aggregate of $14,000,000. |  |  |  |  |  |
Debt Instrument, Increase, Accrued Interest | $ 60,000 |  |  |  |  |  |
Debt Conversion Converted Instrument Discount Rate | 5.00% |  |  |  |  |  |
Convertible Promissory Notes [Member] |  |  |  |  |  |  |
Debt Conversion, Original Debt, Amount |  | $ 1,000,000 |  |  |  |  |
Short-term Debt, Percentage Bearing Fixed Interest Rate |  | 12.00% |  |  |  |  |
Short-term Debt, Terms |  | 90 days |  |  |  |  |
Debt Instrument, Maturity Date |  |  | Apr. 01, 2015 |  |  |  |
Term Of Warrants |  | 5 years |  |  |  |  |
Convertible Debt [Member] |  |  |  |  |  |  |
Debt Instrument, Increase, Accrued Interest | $ 60,000 |  |  |  |  |  |
Debt Conversion Converted Instrument Discount Rate | 5.00% |  |  |  |  |  |
January 2013 Private Placement [Member] |  |  |  |  |  |  |
Common Stock Purchase Price |  |  |  |  |  | $ 0.50 |
Warrants Issued During Period for Common Stock |  |  |  |  |  | 1,860,000 |
Warrants Exercise Price Per Share |  |  |  |  |  | $ 0.66 |
Percentage of Common Stock Purchased |  |  |  |  |  | 25.00% |
Issuance of Additional Common Shares to Investors |  |  |  |  |  | 1,064,658 |
Net Shares Reclassified to Mandatorily Redeemable Capital Stock, Value |  |  |  |  |  | $ 8,800,000 |
Proceeds from Issuance of Common Stock and Warrants |  |  |  |  |  | 9,300,000 |
Proceeds from Issuance of Warrants |  |  |  |  |  | 400,000 |
Incremental Compensation Cost |  |  |  |  |  | $ 200,000 |
April 2011 Private Placement [Member] |  |  |  |  |  |  |
Common Stock Purchase Price |  |  |  |  |  | $ 0.75 |
Warrants Issued During Period for Common Stock |  |  |  |  |  | 1,266,667 |
Warrants Exercise Price Per Share |  |  |  |  |  | $ 0.90 |
Percentage of Common Stock Purchased |  |  |  |  |  | 25.00% |
Net Shares Reclassified to Mandatorily Redeemable Capital Stock, Value |  |  |  |  |  | $ 8,200,000 |
Proceeds from Issuance of Common Stock and Warrants |  |  |  |  |  | 9,400,000 |
Proceeds from Issuance of Warrants |  |  |  |  |  | 900,000 |
Incremental Compensation Cost |  |  |  |  |  | $ 300,000 |
April 2011 Private Placement [Member] | Minimum [Member] |  |  |  |  |  |  |
Warrants Exercise Price Per Share |  |  |  |  |  | $ 0.50 |
April 2011 Private Placement [Member] | Maximum [Member] |  |  |  |  |  |  |
Warrants Exercise Price Per Share |  |  |  |  |  | $ 0.90 |
March 2015 Private Placement [Member] |  |  |  |  |  |  |
Net Shares Reclassified to Mandatorily Redeemable Capital Stock, Value |  |  |  |  |  | $ 8,000,000 |
Proceeds from Issuance of Common Stock and Warrants |  |  |  |  |  | 14,000,000 |
Proceeds from Issuance of Warrants |  |  |  |  |  | 5,100,000 |
Incremental Compensation Cost |  |  |  |  |  | 880,000 |
Warrants and Rights Outstanding |  |  |  |  |  | $ 1,600,000 |

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