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Property and Equipment - Schedule of Property and Equipment (Details) - USD ($) $ in Thousands | Jul. 31, 2025 | Apr. 30, 2025
--- | --- | ---
Property, Plant and Equipment [Line Items] |  |
Total property and equipment | $ 16,252 | $ 16,063
Less: Accumulated depreciation and amortization | (12,022) | (11,688)
Property and equipment, net | $ 4,230 | $ 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 | 2,168 | 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 | 11,465 | 11,323
Assets in progress |  |
Property, Plant and Equipment [Line Items] |  |
Total property and equipment | 168 | 124
Leasehold improvements |  |
Property, Plant and Equipment [Line Items] |  |
Total property and equipment | $ 317 | $ 317

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