v3.26.1
Property and Equipment - Narrative (Details) - USD ($)
12 Months Ended
Apr. 30, 2026
Apr. 30, 2025
Apr. 30, 2023
Apr. 30, 2022
Property, Plant, and Equipment [Line Items]        
Depreciation and amortization $ 1,400,000 $ 1,600,000    
Depreciation and amortization, excluding finance leases 1,200,000 1,500,000    
Financing lease net asset 85,000 220,000    
Loss on sale and disposal of equipment 111,000 293,000    
Amortization of leased assets $ 135,000 150,000    
Finance lease, weighted average remaining lease term 1 year 29 days      
2022 Finance Lease        
Property, Plant, and Equipment [Line Items]        
Finance lease costs $ 370,000     $ 370,000
Present value of minimum future obligations interest rate 3.25%      
Amortization of leased assets $ 59,000 77,000    
Interest on finance lease liability 600 3,000    
2023 Finance Lease        
Property, Plant, and Equipment [Line Items]        
Finance lease costs $ 368,000   $ 368,000  
Present value of minimum future obligations interest rate 3.50%      
Amortization of leased assets $ 76,000 73,000    
Interest on finance lease liability 4,000 7,000    
Laboratory Equipment        
Property, Plant, and Equipment [Line Items]        
Financing lease net asset 1,000,000.0 1,000,000.0    
Depreciation 135,000 150,000    
Disposed of lab equipment 307,000 636,000    
Accumulated depreciation 172,000 343,000    
Proceeds from sale of property and equipment 24,000      
Loss on sale and disposal of equipment $ 111,000 $ 293,000