Property and Equipment - Summary of Property and Equipment (Details) - USD ($) $ in Thousands	Jul. 31, 2023	Apr. 30, 2023
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 16,448	$ 15,816
Less: Accumulated depreciation and amortization	(9,075)	(8,630)
Property and equipment, net	$ 7,373	$ 7,186
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	2,131	2,102
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	11,479	10,390
Assets in progress
Property, Plant and Equipment [Line Items]
Total property and equipment	388	1,079
Leasehold improvements
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 316	$ 111