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Redeemable Common Stock and Stock Purchase Warrants (Details Textual) (USD $) | 1 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jan. 28, 2013 | Mar. 24, 2011 | Jan. 31, 2014 | Apr. 30, 2013
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 |  |
Proceeds from Issuance of Common Stock and Warrants | 9,100,000 |  |  |
Percentage of Cash Penalties |  |  | 1.00% |
Purchase Price Limit Percentage |  |  | 10.00% |
Estimated Fair Value of Warrants |  |  | 2,248,000 | 1,046,000
Minimum [Member] |  |  |  |
Potential Penalties Amount |  |  | 50,000 |
Maximum [Member] |  |  |  |
Potential Penalties Amount |  |  | 130,000 |
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 |
Warrants and Rights Outstanding |  |  | 800,000 |
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 |

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