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Elements of Deferred Income Tax Assets (Liabilities) (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Deferred tax assets (liabilities) |  |
- Depreciation & amortization | $ (236) | $ (412)
- Reserves for doubtful accounts | 139 | 127
- Inventory reserve | 304 | 250
- Non qualified stock options | 247 | 108
- NOL | 2,078 | 3,430
- AMT credit carryforward | 0 | 160
Total | $ 2,500 | $ 3,700

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