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Property and Equipment - Summary of Property and Equipment (Details) - USD ($) $ in Thousands | Jan. 31, 2022 | Apr. 30, 2021 | Jul. 31, 2020
--- | --- | --- | ---
Property, Plant and Equipment [Line Items] |  |  |
Total property and equipment | $ 11,999 | $ 10,046 |
Less: Accumulated depreciation and amortization | (5,008) | (3,956) |
Property and equipment, net | 6,991 | 6,090 |
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 | 1,595 | 1,461 |
Capitalized software development costs |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Total property and equipment | 1,888 | 484 | $ 484
Laboratory equipment |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Total property and equipment | 8,090 | 6,640 |
Assets in progress |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Total property and equipment | 68 | 1,211 |
Leasehold improvements |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Total property and equipment | $ 112 | $ 4 |

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