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Antidilutive securities excluded from computation of diluted net loss per share (Details) - shares
6 Months Ended 12 Months Ended
Oct. 31, 2023
Apr. 30, 2023
Accounting Policies [Abstract]    
Series B Preferred Stock, as converted 3,896 822,230
Stock options 6,861,517 4,784,809
Warrants 1,539,999 1,539,999
Restricted stock 779,850 781,060
Total 9,185,262 7,928,098