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Stock-based Payments - Narrative (Details) - USD ($) |  |  |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Apr. 24, 2017 | Jul. 21, 2016 | Dec. 12, 2013 | Feb. 18, 2011 | Jul. 31, 2016 | Apr. 30, 2018 | Apr. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Stock-based compensation expense |  |  |  |  |  | $ 1,034,000 | $ 2,662,000
Stock options award shares to purchase common stock |  |  | 16,667 |  |  |  |
Grants in period, weighted average grant date fair value (in dollars per share) |  |  |  |  |  | $ 2.19 | $ 1.71
Shares granted (in shares) |  | 1,568,191 |  |  |  | 455,310 | 2,420,681
Modification expense (in usd) |  |  |  |  |  | $ 56,529 |
Shares exchange during period (in shares) |  | 1,793,781 |  |  |  |  |
Grants in period, weighted average exercise price (in usd per share) |  | $ 2.10 |  |  |  | $ 3.01 | $ 1.99
Warrants outstanding (in shares) |  |  |  |  |  | 2,004,284 |
Stock-based compensation related to issuance of common stock as compensation for services performed |  |  |  |  |  | $ 15,000 |
General and administrative |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Stock-based compensation expense |  |  |  |  |  | $ 689,000 | $ 2,193,000
Stock or unit option plan expense |  |  |  |  |  |  | $ 612,534,000
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 |
Chief Executive Officer and President |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares granted (in shares) |  |  |  |  |  |  | 203,043
November 2016 | Chief Executive Officer and President |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares granted (in shares) |  |  |  |  |  |  | 209,383
Employee Stock Option |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Modification expense (in usd) |  | $ 414,756 |  |  | $ 373,069 |  |
Modification expense for future period (in usd) |  | 1,767 |  |  |  |  |
Employee Stock Option | Chief Executive Officer |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Modification expense (in usd) | $ 612,534 |  |  |  |  |  |
Employee Stock Options Forfeited |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Modification expense (in usd) |  | $ 39,920 |  |  |  |  |

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