v3.25.2
Income Taxes (Details Narrative) - USD ($)
$ in Thousands
 12 Months Ended
Apr. 30, 2025
Apr. 30, 2024
Operating Loss Carryforwards [Line Items]    
Income tax benefit $ (1,034) $ (1,254)
Deferred tax assets, valuation allowance 62,192 60,322
Valuation allowance, deferred tax asset, increase (decrease), amount 1,900 5,700
Net operating loss carry forwards $ 250,000  
Operating loss carryforwards, expiration description begin to expire in fiscal 2026  
Operating loss carryforwards subject to no expiration $ 116,200  
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.  
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 $ 28,300  
Operating loss carryforwards, expiration description begin to expire in 2042  
Research and Development Expense [Member]    
Operating Loss Carryforwards [Line Items]    
Tax credit carryforward, amount $ 5,200  
New Jersey Division of Taxation [Member]    
Operating Loss Carryforwards [Line Items]    
Income tax benefit $ 1,000 $ 1,300