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Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Components of Deferred Tax Assets and Liabilities [Abstract] |  |
Deferred revenue, current | $ 856 | $ 860
Intangibles and related other, long-term | 159 | (580)
Inventory reserve, current | 1,871 | 1,598
Inventory reserve, long-term | 0 | 0
Net operationg loss carryforwards, long-term | 667 | 364
Research and development tax credits, long-term | 248 | 1,033
Accrued expenses, current | 140 | 182
Stock-based compensation, long-term | 684 | 742
Allowance for sales returns and doubtful accounts, current | 20 | 56
Difference in property and equipment basis, long-term | (475) | (646)
Other, current | 462 | 291
Other, long-term | (19) | 52
Total net deferred income tax assets, current | 3,349 | 2,987
Total net deferred income tax asset, long-term | 1,264 | 965
Less: Valuation allowance, current | (201) | 0
Less: valuation allowance, long-term | (69) | (1,066)
Net deferred income tax asset (liability), current | 3,148 | 2,987
Net deferred income tax asset (liability), long-term | 1,195 | 0
Deferred Tax Liabilities, Net, Noncurrent | $ 0 | $ (101)

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