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Income Taxes (Tables)
 12 Months Ended
Apr. 30, 2020
Income Tax Disclosure [Abstract]  
Schedule of Components of Loss Before Income Taxes

Loss before income taxes for the years ended April 30, 2020 and 2019 consisted of the following components:

 

    April 30, 2020     April 30, 2019  
    (in thousands)  
             
Domestic   $ (10,985 )   $ (12,860 )
Foreign     (262 )     (236 )
Total loss before income taxes   $ (11,247 )   $ (13,096 )
Schedule of Effective Income Tax Rate Reconciliation

The effective income tax rate differed from the percentages computed by applying the US federal income tax rate for the periods ended April 30, 2020 and 2019 to loss before income taxes as a result of the following:

 

    April 30, 2020     April 30, 2019  
       
Computed expected tax (benefit)     (21.0 )%     (21.0 )%
Increase(reduction) in income taxes resulting from:                
State income taxes, net of federal (benefit)     2.9 %     0.8 %
Federal research and development tax credits     (0.5 )%     (1.5 )%
Foreign rate differential     5.2 %     0.2 %
Other non-deductible expenses     0.0 %     0.1 %
Proceeds of sale of New Jersey tax (benefits)     (8.0 )%     (6.5 )%
Other     5.2 %     0.6 %
Increase in valuation allowance     8.3 %     20.8 %
Income tax (benefit)     (7.9 )%     (6.5 )%
Schedule of Deferred Tax Assets and Liabilities

The tax effects of temporary differences and carry forwards that give rise to the Company’s deferred tax assets and deferred tax liabilities are presented below.

 

    April 30, 2020     April 30, 2019  
    (in thousands)  
             
Deferred tax assets:                
Federal net operating loss carryforwards   $ 33,740     $ 32,025  
Foreign net operating loss carryforwards     3,307       3,641  
State operating loss carryforwards     1,598       1,653  
Federal and New Jersey research and development tax credits     3,076       3,315  
Stock compensation     311       486  
Accrued expenses     131       145  
Other     595       443  
Net deferred tax assets before valuation allowance     42,758       41,708  
Valuation allowance     (42,431 )     (41,708 )
Deferred tax assets     327       -  
                 
Deferred tax liability:                
Lease liability     327       -  
Net deferred tax assets   $ -     $ -