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Income Taxes (Tables)
 12 Months Ended
Apr. 30, 2021
Income Tax Disclosure [Abstract]  
Schedule of Components of Loss Before Income Taxes

Loss before income taxes for the years ended April 30, 2021 and 2020 consisted of the following components:

 

    April 30, 2021     April 30, 2020  
    (in thousands)  
             
Domestic   $ (14,392 )   $ (10,985 )
Foreign     (368 )     (262 )
Total loss before income taxes   $ (14,760 )   $ (11,247 )
Schedule of Effective Income Tax Rate Reconciliation

The effective income tax rate differed from the percentages computed by applying the U.S. federal income tax rate for the periods ended April 30, 2021 and 2020 to loss before income taxes as a result of the following:

 

    April 30, 2021     April 30, 2020  
             
Computed expected tax (benefit)     (21.0 )%     (21.0 )%
Increase(reduction) in income taxes resulting from:                
State income taxes, net of federal (benefit)     6.8 %     2.9 %
Federal research and development tax credits     (0.7 )%     (0.5 )%
Foreign rate differential     (1.3 )%     5.2 %
Other non-deductible expenses     (0.6 )%     0.0 %
Proceeds of sale of New Jersey tax (benefits)     0.0 %     (8.0 )%
Other     2.3 %     5.2 %
Increase in valuation allowance     14.5 %     8.3 %
Income tax (benefit)     0.0 %     (7.9 )%
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, 2021     April 30, 2020  
    (in thousands)  
             
Deferred tax assets:                
Federal net operating loss carryforwards   $ 36,340     $ 33,740  
Foreign net operating loss carryforwards     4,064       3,307  
State operating loss carryforwards     581       1,598  
Federal and New Jersey research and development tax credits     3,303       3,076  
Stock compensation     346       311  
Accrued expenses     158       131  
Other     545       595  
Net deferred tax assets before valuation allowance     45,337       42,758  
Valuation allowance     (45,091 )     (42,431 )
Deferred tax assets     246       327  
                 
Deferred tax liability:                
Lease liability     246       327  
Net deferred tax assets   $ -     $ -