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Income Taxes (Tables) | 12 Months Ended
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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 |  | $ | - |  |  | $ | - |

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