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Share-Based Payments (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 12, 2013
Feb. 18, 2011
Jan. 31, 2016
Jan. 31, 2015
Jan. 31, 2016
Jan. 31, 2015
Apr. 30, 2015
Apr. 30, 2014
Stock-based compensation expense     $ 567,000 $ 657,000 $ 2,090,000 $ 2,284,000 $ 3,162,000 $ 2,807,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value     $ 3.12   $ 3.60 $ 8.04 $ 7.32 $ 11.52
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross         331,582   1,763,380 816,111
Share-based Compensation Arrangement by Share-based Payment Award, Vesting Period, Fair Value             $ 0 $ 15,000
Stock options award Shares to purchase common Stock 16,667              
Share Based Compensation Arrangement By Share Based Payment Award Warrants Outstanding     2,109,840   2,109,840   2,109,840  
Share Based Compensation Arrangement By Share Based Payment Award Shares Exchanged In Period             1,656,073  
Share Based Compensation Arrangement By Share Based Payment Award Options For Exchanges In Period Weighted Average Exercise Price             $ 4.92  
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period             1,468,161  
Stock or Unit Option Plan Expense             $ 213,951  
Additional Stock Option Plan Expense             386,578  
General and Administrative Expense [Member]                
Stock-based compensation expense     $ 488,000 $ 474,000 $ 1,600,000 $ 1,530,000 2,204,000 $ 2,298,000
Stock or Unit Option Plan Expense             $ 213,952  
Minimum [Member]                
Share Based Compensation Arrangement By Share Based Payment Award Options For Exchanges In Period Weighted Average Exercise Price             $ 5.64  
Maximum [Member]                
Share Based Compensation Arrangement By Share Based Payment Award Options For Exchanges In Period Weighted Average Exercise Price             $ 15.96  
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 8,333              
Stock Options Award Shares To Purchase Unregistered Common Stock 1,667              
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         224,663   224,663  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures, Total         224,663   224,663  
Chief Executive Officer [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross             96,283  
President [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross             90,358  
March 2015 Private Placement [Member]                
Warrants Issued During Period for Common Stock         1,849,285   1,849,285