Property and Equipment - Summary of Property and Equipment (Details) - USD ($) $ in Thousands	Jul. 31, 2022	Apr. 30, 2022
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 13,803	$ 12,711
Less: Accumulated depreciation	(6,105)	(5,577)
Property and equipment, net	$ 7,698	$ 7,134
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Property, Plant and Equipment, Net	Property, Plant 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	1,953	1,667
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	9,073	8,618
Assets in progress
Property, Plant and Equipment [Line Items]
Total property and equipment	532	181
Leasehold improvements
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 111	$ 111