Property and Equipment - Schedule of Property and Equipment (Details) - USD ($) $ in Thousands	Jan. 31, 2025	Apr. 30, 2024
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 16,676	$ 16,112
Less: Accumulated depreciation and amortization	(11,636)	(10,391)
Property and equipment, net	$ 5,040	$ 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	2,165	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	11,951	11,506
Assets in progress
Property, Plant and Equipment [Line Items]
Total property and equipment	109	3
Leasehold improvements
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 317	$ 317