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Schedule of Components of Property and Equipment (Details) - USD ($) $ in Thousands	Jul. 31, 2022	Apr. 30, 2022
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 2,086	$ 2,030
Less: accumulated depreciation	(1,628)	(1,585)
Property and equipment, net	458	445
Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	626	615
Computer Equipment And Software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	590	571
Office Furniture And Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	352	352
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	503	477
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 15	$ 15

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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