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Income Taxes (Details Narrative) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
May 31, 2021 | Apr. 30, 2022 | Apr. 30, 2021
Operating Loss Carryforwards [Line Items] |  |  |
Income tax benefit |  | $ (1,823) |
Deferred tax assets, valuation allowance |  | 47,597 | 45,091
Increase (decrease) in valuation allowance |  | 2,500 | 2,700
Net operating loss carry forwards |  | $ 191,400 |
Operating loss carryforwards, expiration description |  | begin to expire in fiscal 2023; |
Net operating loss subject to no expiration |  | $ 56,200 |
Operating loss carryforwards, expiration description |  | the deductibility of such federal net operating losses may be limited to 80% of our taxable income in future years. |
Proceed from sale of loss carryforwards and tax credits | $ 1,400 |  |
Operating Income (Loss) |  | $ (21,613) | (13,592)
Maximum [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating Income (Loss) |  | 4,600 |
US Employees [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating Income (Loss) |  | 20,000 |
New Jersey Division of Taxation [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Income tax benefit |  | 400 | 1,000
Net operating loss carry forwards |  | $ 4,000 | $ 12,000
State and Local Jurisdiction [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating loss carryforwards, expiration description |  | begin to expire in 2041, which also may be limited to utilization limitations. |
Foreign Tax Authority [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Net operating loss carry forwards |  | $ 10,900 |
Research and Development Expense [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Tax credit carry forwards |  | 3,300 |
Marine Advanced Robotics, Inc. [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Income tax benefit |  | $ 400 |

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