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Schedule of Components of Property and Equipment (Details) - USD ($) $ in Thousands	Jan. 31, 2022	Apr. 30, 2021
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 1,682	$ 1,619
Less: accumulated depreciation	(1,317)	(1,213)
Property and equipment, net	365	406
Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	320	291
Computer Equipment And Software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	521	498
Office Furniture And Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	352	341
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	474	474
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 15	$ 15

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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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