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Income Taxes (Details Narrative) - USD ($)
$ in Thousands
 12 Months Ended
Apr. 30, 2023
Apr. 30, 2022
Operating Loss Carryforwards [Line Items]    
Deferred Tax Assets, Valuation Allowance $ 54,644 $ 47,597
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount 7,000 2,500
Net operating loss carry forwards $ 207,800  
Operating loss carryforwards, expiration description begin to expire in fiscal 2023  
Operating loss carryforwards subject to no expiration $ 72,800  
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.  
Income tax benefit $ (278) (1,823)
Description of tax credit carryforward, limitations on use Expenses incurred in connection with R&E activities in the US must be amortized over a 5-year period if incurred, and R&E expenses incurred outside the US must be amortized over a 15-year period.  
Maximum [Member]    
Operating Loss Carryforwards [Line Items]    
Income tax benefit, net operating losses $ 20,000  
Income tax benefit, research and development expense 20,000  
New Jersey Division of Taxation [Member]    
Operating Loss Carryforwards [Line Items]    
Income tax benefit 300 $ 1,400
State and Local Jurisdiction [Member]    
Operating Loss Carryforwards [Line Items]    
Net operating loss carry forwards $ 22,500  
Operating loss carryforwards, expiration description begin to expire in 2042, which also may be limited to utilization limitations.  
Foreign Tax Authority [Member]    
Operating Loss Carryforwards [Line Items]    
Net operating loss carry forwards $ 10,800  
Research and Development Expense [Member]    
Operating Loss Carryforwards [Line Items]    
Tax Credit Carryforward, Amount $ 4,000