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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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Weighted average price of options that were exchanged under contractual agreement.

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The number of shares under options that were exchanged during the reporting period as a result of occurrence of an event specified in contractual agreements pertaining to the stock option plan.

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Number of shares to purchase common stock option awards during the reporting period.

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Net number of share options (or share units) granted during the period.

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An excess of the fair value of the modified award over the fair value of the award immediately before the modification.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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