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Property and Equipment - Summary of Property and Equipment (Details) - USD ($) $ in Thousands | Apr. 30, 2022 | Apr. 30, 2021 | Jul. 31, 2020
--- | --- | --- | ---
Property, Plant and Equipment [Line Items] |  |  |
Total property and equipment | $ 12,711 | $ 10,046 |
Less: Accumulated depreciation and amortization | (5,577) | (3,956) |
Property and equipment, net | $ 7,134 | $ 6,090 |
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 | 1,667 | 1,461 |
Laboratory equipment |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Total property and equipment | 8,618 | 6,640 |
Capitalized software development costs |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Total property and equipment | 1,888 | 484 | $ 484
Assets in progress |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Total property and equipment | 181 | 1,211 |
Leasehold improvements |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Total property and equipment | $ 111 | $ 4 |

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