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Stock-based Payments - Narrative (Details) - USD ($) |  |  | 12 Months Ended
--- | --- | --- | ---
Dec. 12, 2013 | Feb. 18, 2011 | Apr. 30, 2016 | Apr. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense |  |  | $ 2,599,000 | $ 3,162,000
Stock or unit option plan expense |  |  | $ 213,951 |
Stock options award shares to purchase common stock | 16,667 |  |  |
Grants in period, weighted average grant date fair value (in dollars per share) |  |  | $ 3.54 | $ 7.32
Shares granted (in shares) |  |  | 343,749 | 1,763,381
Additional stock option plan expense |  |  | $ 386,578 |
Shares exchange during period (in shares) |  |  | 1,656,073 |
Exchanges, weighted average exercise price (in dollars per share) |  |  | $ 4.92 |
Shares issued during period (in shares) |  |  | 1,468,161 |
Warrants outstanding (in shares) |  |  | 2,109,840 |
General and Administrative Expense [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense |  |  | $ 2,035,000 | $ 2,204,000
Stock or unit option plan expense |  |  | $ 213,952,000 |
Minimum [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Exchanges, weighted average exercise price (in dollars per share) |  |  | $ 15.96 |
Maximum [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Exchanges, weighted average exercise price (in dollars per share) |  |  | $ 5.64 |
Equity Incentive Plan 2010 [Member] |  |  |  |
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 [Member] | Maximum [Member] |  |  |  |
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 [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Expiration term of awards |  |  | 10 years |
Director Compensation Plan [Member] |  |  |  |
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% |  |  |
Amended Executive Employment Agreements [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period |  |  | 1 year |
Board of Directors Chairman [Member] | Director Compensation Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Term of option to purchase |  |  | 5 years |
Chief Executive Officer and President [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares granted, net of forfeitures (in shares) |  |  | 224,663 |
Shares granted (in shares) |  |  | 224,663 |
Vesting period |  |  | 3 years |
Chief Executive Officer [Member] | Amended Executive Employment Agreements [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares granted (in shares) |  |  | 96,283 |
President [Member] | Amended Executive Employment Agreements [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares granted (in shares) |  |  | 90,358 |
March 2015 Private Placement [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Warrants issued during period for common stock (in shares) |  |  | 1,849,285 |

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