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Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
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Components of Deferred Tax Assets and Liabilities [Abstract] |  |
Deferred revenue | $ 1,019 | $ 1,120
Basis difference in intangible assets | 26 | 42
Inventory reserve | 2,452 | 2,213
Net operating loss carryforwards | 1,347 | 957
Research and development tax credits | 0 | 60
Accrued expenses | 165 | 292
Stock-based compensation | 672 | 577
Allowance for sales returns and doubtful accounts | 20 | 22
Difference in property and equipment basis | (423) | (318)
Other | 886 | 910
Total net deferred income tax asset | 6,164 | 5,875
Less: Valuation allowance | (1,071) | (786)
Net deferred income tax asset (liability) | $ 5,093 | $ 5,089

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