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Inventories - Schedule of Inventories (Detail) - USD ($) $ in Thousands | Jul. 31, 2021 | Jan. 31, 2021 | Jan. 31, 2020
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Inventory Disclosure [Abstract] |  |  |
Raw materials | $ 7,468 | $ 6,905 | $ 7,388
Finished goods | 3,455 | 3,466 | 3,758
Work in progress | 2,404 | 2,445 | 2,720
Cost of inventories | 13,327 | 12,816 | 13,866
Less allowance for obsolescence | (1,399) | (1,363) | (1,210)
Total inventories, net | $ 11,928 | $ 11,453 | $ 12,656

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