Share-Based Payments (Details Textual) (USD $)	1 Months Ended	12 Months Ended		1 Months Ended			12 Months Ended
	Dec. 12, 2013	Apr. 30, 2014	Apr. 30, 2013	Feb. 18, 2011 Equity Incentive Plan 2010 [Member] Minimum [Member]	Feb. 18, 2011 Equity Incentive Plan 2010 [Member] Maximum [Member]	Dec. 12, 2013 Director Compensation Plan [Member]	Apr. 30, 2014 Chief Executive Officer and President [Member]	Apr. 30, 2014 April 2011 Private Placement [Member]	Apr. 30, 2014 January 2013 Private Placement [Member]	Apr. 30, 2014 Equity Instrument [Member]
Stock-based compensation expense		$ 2,807,000	$ 2,376,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross		9,793,332	741,250				3,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures, Total							3,000,000
Warrants Issued During Period for Common Stock								1,266,667	1,860,000	150,000
Percentage Of Strike Price On Fair Market Value				100.00%
Stock options award Shares to purchase common Stock	200,000					100,000
Stock Options Award Shares To Purchase Unregistered Common Stock						20,000
Share Based Compensation Arrangement by Share Based Payment Award Options Vested Percentage						25.00%
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures, Total					30,000,000
Share Based Compensation Arrangement By Share Based Payment Award Warrants Outstanding		3,276,667
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value		$ 0.96	$ 0.41
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value		$ 15,000	$ 34,000