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Stock-based Payments - Narrative (Details) - USD ($) |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Jul. 21, 2016 | Dec. 12, 2013 | Feb. 18, 2011 | Apr. 30, 2019 | Apr. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock-based compensation expense |  |  |  | $ 649,000 | $ 1,034,000
Stock-based compensation related to issuance of common stock as compensation for services performed |  |  |  | 13,000 | $ 15,000
Modification expense |  |  |  | $ 56,529 |
Stock options award shares to purchase common stock |  | 16,667 |  |  |
Grants in period, weighted average grant date fair value (in dollars per share) |  |  |  | $ 6.03 | $ 2.19
Shares exchange during period (in shares) | 1,793,781 |  |  |  |
Shares granted (in shares) | 1,568,191 |  |  | 206,790 | 455,310
Grants in period, weighted average exercise price (in dollars per share) | $ 2.10 |  |  | $ 9.86 | $ 3.01
Warrants outstanding (in shares) |  |  |  | 1,671,440 |
General and administrative |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock-based compensation expense |  |  |  | $ 458,000 | $ 689,000
Minimum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Exchanges, weighted average exercise price (in dollars per share) | 4.55 |  |  |  |
Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Exchanges, weighted average exercise price (in dollars per share) | $ 6.96 |  |  |  |
Equity Incentive Plan 2010 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Expiration term of awards |  |  |  | 10 years |
Strike price as percent of market value |  |  |  | 100.00% |
Equity Incentive Plan 2010 | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares granted, net of forfeitures (in shares) |  |  | 30,000,000 |  |
2008 Equity Incentive Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Expiration term of awards |  |  |  | 10 years |
Director Compensation Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock options award shares to purchase common stock |  | 8,333 |  |  |
Stock option award shares to purchase unregistered common stock |  | 1,667 |  |  |
Vested percent |  | 25.00% |  |  |
Board of Directors Chairman | Director Compensation Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Term of option to purchase |  |  |  | 5 years |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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