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Share-Based Payments (Details Textual) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 12, 2013 | Feb. 18, 2011 | Apr. 30, 2015 | Apr. 30, 2014
Stock-based compensation expense |  |  | $ 3,162,000 | $ 2,807,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  |  | 21,160,562 | 9,793,332
Share-based Compensation Arrangement by Share-based Payment Award, Vesting Period, Fair Value |  |  | $ 0 | $ 15,000
Stock options award Shares to purchase common Stock | 200,000 |  |  |
Share Based Compensation Arrangement By Share Based Payment Award Warrants Outstanding |  |  | 25,318,082 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value |  |  | $ 0.61 | $ 0.96
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value |  |  | $ 0 | $ 15,000
Share Based Compensation Arrangement By Share Based Payment Award Shares Exchanged In Period |  |  | 19,872,875 |
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period |  |  | 17,617,929 |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price |  |  | $ 0.66 | $ 1.23
Stock or Unit Option Plan Expense |  |  | $ 213,951 |
Additional Stock Option Plan Expense |  |  | 386,578 |
General and Administrative Expense [Member] |  |  |  |
Stock-based compensation expense |  |  | 2,204,000 | $ 2,298,000
Stock or Unit Option Plan Expense |  |  | $ 213,952,000 |
Minimum [Member] |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award Options For Exchanges In Period Weighted Average Exercise Price |  |  | $ 1.33 |
Maximum [Member] |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award Options For Exchanges In Period Weighted Average Exercise Price |  |  | $ 0.47 |
Equity Incentive Plan 2010 [Member] | Maximum [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures, Total |  | 30,000,000 |  |
Director Compensation Plan [Member] |  |  |  |
Stock options award Shares to purchase common Stock | 100,000 |  |  |
Stock Options Award Shares To Purchase Unregistered Common Stock | 20,000 |  |  |
Share Based Compensation Arrangement by Share Based Payment Award Options Vested Percentage | 25.00% |  |  |
Chief Executive Officer and President [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  |  | 2,695,954 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures, Total |  |  | 2,695,954 |
Chief Executive Officer [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  |  | 1,155,400 |
President [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  |  | 1,084,298 |
March 2015 Private Placement [Member] |  |  |  |
Warrants Issued During Period for Common Stock |  |  | 22,191,415 |

X
- Definition The noncash expense that accounts for the value of additional stock or unit options distributed to employees as compensation. + References No definition available. + Details
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- Definition Weighted average price of options that were exchanged under contractual agreement. + References No definition available. + Details
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- Definition Percentage of stock vested for share based compensation arrangement by share based payment award options during the period. + References No definition available. + Details
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- Definition The number of shares under options that were exchanged during the reporting period as a result of occurrence of an event specified in contractual agreements pertaining to the stock option plan. + References No definition available. + Details
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- Definition Number of shares to purchase common stock option awards during the reporting period. + References No definition available. + Details
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Net number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of share instruments newly issued under a share-based compensation plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The noncash expense that accounts for the value of stock or unit options distributed to employees as compensation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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