Antidilutive securities excluded from computation of diluted net loss per share (Details) - shares	3 Months Ended	12 Months Ended
Jul. 31, 2023	Apr. 30, 2023
Accounting Policies [Abstract]
Series B Preferred Stock, as converted	3,896	822,230
Stock options	6,884,017	4,784,809
Warrants	1,539,999	1,539,999
Restricted stock	842,701	781,060
Total	9,270,613	7,928,098

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 260
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482662/260-10-50-1

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Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration