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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