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Income Taxes (Tables) - Components of Deferred Tax Assets and Liabilities (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
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Components of Deferred Tax Assets and Liabilities [Abstract] |  |
Deferred revenue, current | $ 971 | $ 856
Intangibles and related other, long-term | 82 | 159
Inventory reserve, current | 1,955 | 1,871
Net operationg loss carryforwards, long-term | 682 | 667
Research and development tax credits, long-term | 31 | 248
Accrued expenses, current | 159 | 140
Stock-based compensation, long-term | 679 | 684
Allowance for sales returns and doubtful accounts, current | 47 | 20
Difference in property and equipment basis, long-term | (388) | (475)
Other, current | 458 | 462
Other, long-term | 51 | (19)
Total net deferred income tax assets, current | 3,590 | 3,349
Total net deferred income tax asset, long-term | 1,137 | 1,264
Less: Valuation allowance, current | (265) | (201)
Less: valuation allowance, long-term | (113) | (69)
Net deferred income tax asset (liability), current | 3,325 | 3,148
Net deferred income tax asset (liability), long-term | $ 1,024 | $ 1,195

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