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Elements of Deferred Income Tax Assets (Liabilities) (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Deferred income tax assets (liabilities) |  |
- Depreciation & amortization | $ (3,665) | $ (236)
- Reserves for doubtful accounts | 115 | 139
- Inventory reserve | 218 | 304
- Non qualified stock options | 409 | 247
- Net operating losses | 1,450 | 2,078
Total | $ (1,473) | $ 2,532

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