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Balance Sheet - Schedule of Inventories (Detail) - USD ($) $ in Thousands | Jul. 31, 2020 | Jan. 31, 2020
--- | --- | ---
Inventories: |  |
Raw materials | $ 7,301 | $ 7,388
Finished goods | 3,836 | 3,758
Work in progress | 3,423 | 2,720
Cost of inventories | 14,560 | 13,866
Less allowance for obsolescence | (1,251) | (1,210)
Total inventories, net | $ 13,309 | $ 12,656

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