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Commitment and Contingencies (Details) - USD ($)
3 Months Ended
Jul. 31, 2024
Jul. 31, 2023
Commitments and Contingencies [Line Items]    
Royalty expense $ 81,000 $ 73,000
Minimum    
Commitments and Contingencies [Line Items]    
Royalty fee per tumor sample $ 0  
Royalty payment, as percent of contract price 2.00%  
Maximum    
Commitments and Contingencies [Line Items]    
Royalty fee per tumor sample $ 30,000  
Royalty payment, as percent of contract price 20.00%