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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Income Tax Disclosure [Abstract] |  |
Deferred revenue | $ 845 | $ 1,019
Basis difference in intangible assets | (56) | 26
Inventory reserve | 2,650 | 2,452
Net operating loss carryforwards | 1,391 | 1,347
Research and development tax credits | 88 |
Accrued expenses | 92 | 165
Stock-based compensation | 584 | 672
Allowance for sales returns and doubtful accounts | 70 | 20
Difference in property and equipment basis | (350) | (423)
Other | 743 | 886
Total net deferred income tax asset | 6,057 | 6,164
Less: Valuation allowance | (1,404) | (1,071)
Net deferred income tax asset (liability) | $ 4,654 | $ 5,093

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