Property, Plant, and Equipment - Summary of Property, Plant, and Equipment (Detail) - USD ($) $ in Thousands	Apr. 30, 2021	Apr. 30, 2020
Property Plant And Equipment [Abstract]
Machinery and equipment	$ 15,041	$ 12,987
Software and hardware	5,075	4,960
Leasehold improvements	2,273	2,054
Property plant and equipment gross	22,389	20,001
Less: Accumulated depreciation and amortization	(13,181)	(10,854)
Property plant and equipment before construction in progress	9,208	9,147
Construction in progress	1,784	530
Total property, plant, and equipment, net	$ 10,992	$ 9,677

Computer hardware and software, gross.

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Property plant and equipment gross excluding construction in progress.

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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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Amount of structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service.

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Amount before accumulated depreciation of additions or improvements to assets held under a lease arrangement.

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Amount before accumulated depreciation of tangible personal property used to produce goods and services, including, but is not limited to, tools, dies and molds, computer and office equipment.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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