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Balance Sheet - Schedule of Inventories (Detail) - USD ($) $ in Thousands | Apr. 30, 2019 | Jan. 31, 2019
--- | --- | ---
Inventories: |  |
Raw materials | $ 5,705 | $ 5,446
Finished goods | 4,948 | 5,229
Work in progress | 1,679 | 1,322
Cost of inventories | 12,332 | 11,997
Less allowance for obsolescence | (1,089) | (1,223)
Total inventories, net | $ 11,243 | $ 10,774

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