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Income Taxes - Company's Deferred Taxes (Detail) - USD ($) $ in Thousands | Jan. 31, 2018 | Jan. 31, 2017
--- | --- | ---
Deferred tax assets: |  |
Net operating losses | $ 14,292 | $ 17,666
Tax credit carry forwards | 693 | 894
Stock option book expense | 1,381 | 2,259
Allowance for doubtful accounts | 1,521 | 2,098
Allowance for inventory obsolescence | 430 | 437
Accruals not yet deductible for tax purposes | 611 | 691
Fixed assets | 1,325 | 1,266
Other | 901 | 1,046
Gross deferred tax assets | 21,154 | 26,357
Valuation allowance | (21,154) | (26,357)
Deferred tax assets | 0 | 0
Deferred tax liabilities: |  |
Intangible assets | 0 | (150)
Other | (307) | (167)
Deferred tax liabilities | (307) | (317)
Unrecognized tax benefits | 0 | 0
Total deferred tax liabilities, net | $ (307) | $ (317)

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