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Income Taxes (Tables) | 12 Months Ended
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Apr. 30, 2022
Income Tax Disclosure [Abstract] |
Schedule of Components of Loss Before Income Taxes | Loss before income taxes for the years ended April 30, 2022 and 2021 consisted of the following components: Schedule of Components of Loss Before Income Taxes
|  | April 30, 2022 |  |  | April 30, 2021 |
|  | (in thousands) |
Domestic |  | $ | (20,665 | ) |  | $ | (14,392 | )
Foreign |  |  | (32 | ) |  |  | (368 | )
Total loss before income taxes |  | $ | (20,697 | ) |  | $ | (14,760 | )
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, 2022 and 2021 to loss before income taxes as a result of the following: Schedule of Effective Income Tax Rate Reconciliation
|  | April 30, 2022 |  |  | April 30, 2021 |
Computed expected tax benefit |  |  | (21.0 | )% |  |  | (21.0 | )%
Increase(reduction) in income taxes resulting from: |  |  |  |  |  |  |  |
State income taxes, net of federal benefit |  |  | 5.2 | % |  |  | 6.8 | %
Federal research and development tax credits |  |  | (0.6 | )% |  |  | (0.7 | )%
Foreign rate differential |  |  | — | % |  |  | (1.3 | )%
Other non-deductible expenses |  |  | (0.9 | )% |  |  | (0.6 | )%
Proceeds of sale of New Jersey tax benefits |  |  | (7.0 | )% |  |  | — | %
Other |  |  | 1.3 | % |  |  | 2.3 | %
Increase in valuation allowance |  |  | 14.1 | % |  |  | 14.5 | %
Income tax (benefit) |  |  | (8.9 | )% |  |  | — | %
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. Schedule of Deferred Tax Assets and Liabilities
|  | April 30, 2022 |  |  | April 30, 2021 |
|  | (in thousands) |
Deferred tax assets: |  |  |  |  |  |  |  |
Federal net operating loss carryforwards |  | $ | 40,338 |  |  | $ | 36,340 |
Foreign net operating loss carryforwards |  |  | 2,061 |  |  |  | 4,064 |
State operating loss carryforwards |  |  | 968 |  |  |  | 581 |
Federal and New Jersey research and development tax credits |  |  | 4,167 |  |  |  | 3,303 |
Stock compensation |  |  | 429 |  |  |  | 346 |
Accrued expenses |  |  | 79 |  |  |  | 158 |
Other |  |  | (445 | ) |  |  | 545 |
Net deferred tax assets before valuation allowance |  | $ | 47,597 |  |  | $ | 45,337 |
Valuation allowance |  | $ | (47,597 | ) |  |  | (45,091 | )
Deferred tax assets |  | $ | — |  |  | $ | 246 |
Deferred tax liability: |  |  |  |  |  |  |  |
Other liability |  | $ | 203 |  |  | $ | 246 |
Net deferred tax assets (liabilities) |  | $ | (203 | ) |  | $ | — |

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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32537-109319 + Details
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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319 + Details
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