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Share-Based Payments (Details Textual) - USD ($)
1 Months Ended 12 Months Ended
Dec. 12, 2013
Feb. 18, 2011
Apr. 30, 2015
Apr. 30, 2014
Stock-based compensation expense     $ 3,162,000 $ 2,807,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross     21,160,562 9,793,332
Share-based Compensation Arrangement by Share-based Payment Award, Vesting Period, Fair Value     $ 0 $ 15,000
Stock options award Shares to purchase common Stock 200,000      
Share Based Compensation Arrangement By Share Based Payment Award Warrants Outstanding     25,318,082  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value     $ 0.61 $ 0.96
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value     $ 0 $ 15,000
Share Based Compensation Arrangement By Share Based Payment Award Shares Exchanged In Period     19,872,875  
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period     17,617,929  
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price     $ 0.66 $ 1.23
Stock or Unit Option Plan Expense     $ 213,951  
Additional Stock Option Plan Expense     386,578  
General and Administrative Expense [Member]        
Stock-based compensation expense     2,204,000 $ 2,298,000
Stock or Unit Option Plan Expense     $ 213,952,000  
Minimum [Member]        
Share Based Compensation Arrangement By Share Based Payment Award Options For Exchanges In Period Weighted Average Exercise Price     $ 1.33  
Maximum [Member]        
Share Based Compensation Arrangement By Share Based Payment Award Options For Exchanges In Period Weighted Average Exercise Price     $ 0.47  
Equity Incentive Plan 2010 [Member] | Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures, Total   30,000,000    
Director Compensation Plan [Member]        
Stock options award Shares to purchase common Stock 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%      
Chief Executive Officer and President [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross     2,695,954  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures, Total     2,695,954  
Chief Executive Officer [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross     1,155,400  
President [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross     1,084,298  
March 2015 Private Placement [Member]        
Warrants Issued During Period for Common Stock     22,191,415