Property and Equipment - Schedule of Property and Equipment (Details) - USD ($) $ in Thousands	Oct. 31, 2025	Apr. 30, 2025
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 16,330	$ 16,063
Less: Accumulated depreciation and amortization	(12,379)	(11,688)
Property and equipment, net	$ 3,951	$ 4,375
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	2,175	2,165
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	11,655	11,323
Assets in progress
Property, Plant and Equipment [Line Items]
Total property and equipment	49	124
Leasehold improvements
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 317	$ 317