Property and Equipment - Schedule of Property and Equipment (Details) - USD ($) $ in Thousands	Oct. 31, 2024	Apr. 30, 2024
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 16,206	$ 16,112
Less: Accumulated depreciation and amortization	(11,239)	(10,391)
Property and equipment, net	$ 4,967	$ 5,721
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Property and equipment, net	Property and equipment, net
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 246	$ 246
Computer equipment and software
Property, Plant and Equipment [Line Items]
Total property and equipment	2,155	2,152
Capitalized software development costs
Property, Plant and Equipment [Line Items]
Total property and equipment	1,888	1,888
Laboratory equipment
Property, Plant and Equipment [Line Items]
Total property and equipment	11,531	11,506
Assets in progress
Property, Plant and Equipment [Line Items]
Total property and equipment	69	3
Leasehold improvements
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 317	$ 317