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Share-Based Payments (Details 2) - USD ($) | 12 Months Ended
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Apr. 30, 2015 | Apr. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares, Outstanding, Beginning Balance | 23,351,037 | 13,890,205
Shares, Granted | 21,160,562 | 9,793,332
Shares, Exercised | (3,750) | (33,750)
Shares, Canceled | (19,872,875) | 0
Shares, Forfeited | (151,250) | (72,500)
Shares, Expired | (435,704) | (226,250)
Shares, Outstanding, Ending Balance | 24,048,020 | 23,351,037
Shares, Vested and expected to vest | 24,048,020 | 23,351,037
Shares, Vested | 17,111,080 | 13,564,577
Weighted Average Exercise Price, Outstanding, Beginning Balance | $ 1.01 | $ 0.85
Weighted Average Exercise Price, Granted | 0.66 | 1.23
Weighted Average Exercise Price, Exercised | 0.49 | 0.63
Weighted Average Exercise Price, Canceled | 1.04 | 0
Weighted Average Exercise Price, Forfeited | 0.96 | 0.82
Weighted Average Exercise Price, Expired | 0.99 | 0.73
Weighted Average Exercise Price, Outstanding, Ending Balance | 0.48 | 1.01
Weighted Average Exercise Price, Vested | $ 0.49 | $ 0.85
Weighted Average Remaining Contractual Term, Outstanding, Beggining Balance (in years) | 7 years 6 months | 7 years
Weighted Average Remaining Contractual Term, Outstanding, Ending Balance (in years) | 6 years 8 months 12 days | 7 years 6 months
Weighted Average Remaining Contractual Life (Years), Vested and expected to vest | 6 years 8 months 12 days | 7 years 6 months
Weighted Average Remaining Contractual Life (Years), Vested | 5 years 10 months 24 days | 6 years 1 month 6 days
Aggregate Intrinsic Value, Outstanding, Beginning Balance | $ 985,000 | $ 89,000
Aggregate Intrinsic Value, Outstanding, Ending Balance | 4,166,000 | 985,000
Aggregate Intrinsic Value, Vested and expected to vest | 4,166,000 | 985,000
Aggregate Intrinsic Value, Vested | $ 2,879,000 | $ 927,000
Non-Employees [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares, Outstanding, Beginning Balance | 765,000 | 765,000
Shares, Granted | 80,000 | 0
Shares, Exercised | 0 | 0
Shares, Canceled | 0 | 0
Shares, Forfeited | 0 | 0
Shares, Expired | (150,000) | 0
Shares, Outstanding, Ending Balance | 695,000 | 765,000
Shares, Vested and expected to vest | 695,000 | 765,000
Shares, Vested | 487,500 | 522,292
Directors and Employees [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares, Outstanding, Beginning Balance | 22,586,037 | 13,125,205
Shares, Granted | 21,080,562 | 9,793,332
Shares, Exercised | (3,750) | (33,750)
Shares, Canceled | (19,872,875) | 0
Shares, Forfeited | (151,250) | (72,500)
Shares, Expired | (285,704) | (226,250)
Shares, Outstanding, Ending Balance | 23,353,020 | 22,586,037
Shares, Vested and expected to vest | 23,353,020 | 22,586,037
Shares, Vested | 16,623,580 | 13,042,285

X
- Definition Weighted average remaining contractual term for option awards granted, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + References No definition available. + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option 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 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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