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Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Apr. 30, 2024	Apr. 30, 2023
Income Tax Disclosure [Abstract]
Federal net operating loss carryforwards	$ 48,745	$ 43,788
Foreign net operating loss carryforwards	2,059	2,059
State operating loss carryforwards	1,934	1,578
Federal and New Jersey research and development tax credits	5,404	5,143
Stock compensation	470	662
Accrued expenses	312	474
Other	2,578	1,977
Net deferred tax assets before valuation allowance	61,502	55,681
Valuation allowance	(60,322)	(54,644)
Deferred tax assets	1,180	1,037
Intangibles	793	792
Lease liabilities	590	448
Net deferred tax liabilities	$ (203)	$ (203)

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