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Income Taxes - Tax Effects of Temporary Differences that gave Rise to Significant Portions of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Jan. 31, 2017 | Jan. 31, 2016
--- | --- | ---
Deferred Tax Assets: |  |
Inventory | $ 2,151 | $ 1,948
State R&D Credits | 679 | 583
Share-Based Compensation | 546 | 830
Foreign Tax Credit | 508 | 426
Compensation Accrual | 281 | 346
Unrecognized State Tax Benefits | 241 | 237
Warranty Reserve | 192 | 149
Deferred Service Contract Revenue | 176 | 200
Other | 348 | 383
Deferred Tax Assets, Total | 5,122 | 5,102
Deferred Tax Liabilities: |  |
Accumulated Tax Depreciation in Excess of Book Depreciation | 1,380 | 1,355
Other | 263 | 193
Deferred Tax Liabilities, Total | 1,643 | 1,548
Subtotal | 3,479 | 3,554
Valuation Allowance | (679) | (583)
Net Deferred Tax Assets | $ 2,800 | $ 2,971

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