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Stockholders' Equity (Deficiency) (Schedule of Warrants) (Details) (Warrant [Member], USD $)
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12 Months Ended |
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Apr. 30, 2014
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Warrant [Member]
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| Number of Shares | |
| Balance Outstanding, April 30, 2013 | 9,090,292 |
| Granted | 18,325,553 |
| Exercised | (4,231,840) |
| Forfeited | (40,000) |
| Expired | |
| Balance Outstanding, April 30, 2014 | 23,144,005 |
| Exercisable, April 30, 2014 | 18,249,528 |
| Weighted Average Exercise Price | |
| Balance Outstanding, April 30, 2013 | $ 0.46 |
| Granted | $ 0.26 |
| Exercised | $ 0.19 |
| Forfeited | $ 0.50 |
| Expired | |
| Balance Outstanding, April 30, 2014 | $ 0.31 |
| Exercisable, April 30, 2014 | $ 0.31 |
| Average Remaining Contractual Term | |
| Balance Outstanding, April 30, 2014 | 4 years 7 months 6 days |
| Exercisable, April 30, 2014 | 4 years 7 months 6 days |
| Aggregate Intrinsic Value | |
| Balance Outstanding, April 30, 2014 | |
| Exercisable, April 30, 2014 |
| X | ||||||||||
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- Definition
Weighted average remaining contractual term for equity-based awards excluding options that are currently exercisable, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. No definition available.
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| X | ||||||||||
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- Definition
The weighted-average price as of the balance sheet date at which grantees can acquire the equity instruments reserved for issuance on vested portions of non-options outstanding and currently exercisable under the non-option plan. No definition available.
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| X | ||||||||||
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- Definition
Weighted average price at which the non-option holders acquired equity instruments when converting their non-options into equity instruments. No definition available.
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| X | ||||||||||
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- Definition
Weighted average price at which grantees could have acquired the underlying equity instruments with respect to non-options of the plan that expired. No definition available.
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| X | ||||||||||
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- Definition
Weighted average price at which grantees could have acquired the underlying equity instruments with respect to non-options that were terminated. No definition available.
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| X | ||||||||||
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- Definition
Weighted average price at which grantees can acquire the equity instruments by exercise of the non-options. No definition available.
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| X | ||||||||||
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- Definition
Weighted average price at which grantees can acquire the equity instruments reserved for issuance under the non-option plan. No definition available.
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Number of equity instruments other than options outstanding, into which fully or partially vested instruments outstanding as of the balance sheet date can be currently converted under the plan. No definition available.
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- Details
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Intrinsic value of equity-based compensation awards outstanding. Excludes stock and unit options. No definition available.
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| X | ||||||||||
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- Definition
Intrinsic value of equity-based compensation awards vested. Excludes stock and unit options. No definition available.
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| X | ||||||||||
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- Definition
Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Number of non-option equity instruments exercised by participants. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Number of shares under non-option equity instrument agreements for which rights to exercise lapsed. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Number of shares under non-option equity instrument agreements that were cancelled as a result of occurrence of a terminating event. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Net number of non-option equity instruments granted to participants. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Number of equity instruments other than options outstanding, including both vested and non-vested instruments. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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