Property, Plant, and Equipment - Summary of Property, Plant, and Equipment (Detail) - USD ($) $ in Thousands	Apr. 30, 2024	Apr. 30, 2023
Property, Plant and Equipment [Abstract]
Machinery and equipment	$ 20,852	$ 17,678
Computer and other equipment	1,988	1,865
Leasehold improvements	762	316
Property plant and equipment gross	23,602	19,859
Less: Accumulated depreciation and amortization	(13,599)	(11,229)
Property plant and equipment before construction in progress	10,003	8,630
Construction in progress	1,035	858
Total property, plant, and equipment, net	$ 11,038	$ 9,488