Property and Equipment - Schedule of Property and Equipment (Details) - USD ($) $ in Thousands	Apr. 30, 2025	Apr. 30, 2024
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 16,063	$ 16,112
Less: Accumulated depreciation and amortization	(11,688)	(10,391)
Property and equipment, net	$ 4,375	$ 5,721
Finance lease, right-of-use asset, statement of financial position [Extensible Enumeration]	Property and equipment, net	Property and equipment, net
Current portion financing lease	$ 135
Long-term portion financing lease	85
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
Laboratory equipment
Property, Plant and Equipment [Line Items]
Total property and equipment	11,323	11,506
Capitalized software development costs
Property, Plant and Equipment [Line Items]
Total property and equipment	1,888	1,888
Assets in progress
Property, Plant and Equipment [Line Items]
Total property and equipment	124	3
Leasehold improvements
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 317	$ 317