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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, 2019 | Jan. 31, 2018
--- | --- | ---
Deferred Tax Assets: |  |
Inventory | $ 1,800 | $ 1,648
Honeywell Royalty Liability | 3,146 | 3,382
State R&D Credits | 1,305 | 1,161
Share-Based Compensation | 493 | 399
Compensation Accrual | 155 | 194
Warranty Reserve | 201 | 139
Unrecognized State Tax Benefits | 133 | 138
Deferred Service Contract Revenue | 91 | 84
Bad Debt | 101 |
Net Operating Loss | 505 |
Other | 142 | 176
Deferred Tax Assets, Total | 8,072 | 7,321
Deferred Tax Liabilities: |  |
Intangibles | 2,660 | 3,679
Accumulated Tax Depreciation in Excess of Book Depreciation | 982 | 1,028
Other | 238 | 322
Deferred Tax Liabilities, Total | 3,880 | 5,029
Subtotal | 4,192 | 2,292
Valuation Allowance | (1,304) | (1,161)
Net Deferred Tax Assets | $ 2,888 | $ 1,131

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