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Income Taxes (Details Narrative) - USD ($)
$ in Thousands
 12 Months Ended
Apr. 30, 2024
Apr. 30, 2023
Operating Loss Carryforwards [Line Items]    
Income tax benefit $ (1,254) $ (278)
Deferred tax assets, valuation allowance 60,322 54,644
Valuation allowance, deferred tax asset, increase (decrease), amount 5,700 7,000
Net operating loss carry forwards $ 231,400  
Operating loss carryforwards, expiration description begin to expire in fiscal 2024  
Operating loss carryforwards subject to no expiration $ 97,900  
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.  
Maximum [Member]    
Operating Loss Carryforwards [Line Items]    
Income tax benefit, research and development expense $ 20,000  
State and Local Jurisdiction [Member]    
Operating Loss Carryforwards [Line Items]    
Net operating loss carry forwards $ 27,700  
Operating loss carryforwards, expiration description begin to expire in 2042, which also may be limited to utilization limitations.  
Foreign Tax Jurisdiction [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 4,300  
New Jersey Division of Taxation [Member]    
Operating Loss Carryforwards [Line Items]    
Income tax benefit $ 1,300 $ 300