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Income Taxes Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | ---
Components of Deferred Tax Assets and Liabilities [Abstract] |  |
Deferred revenue, current | $ 1,120 | $ 971
Intangibles and related other, long-term | 42 |
Deferred Tax Asset, Intangible Assets, Long Term |  | 82
Deferred Tax Asset, Inventory, Current | 2,213 | 1,955
Net operationg loss carryforwards, long-term | 957 | 682
Deferred Tax Assets, Tax Credit Carryforwards, Research | 60 | 31
Accrued expenses, current | 117 | 159
Deferred Tax Asset, Expenses Long Term | 175 |
Stock-based compensation, long-term | 577 | 679
Allowance for sales returns and doubtful accounts, current | 22 | 47
Difference in property and equipment basis, long-term | (318) | (388)
Other, current | 908 | 458
Other, long-term | 2 | 51
Total net deferred income tax assets, current | 4,380 | 3,590
Total net deferred income tax asset, long-term | 1,495 | 1,137
Less: Valuation allowance, current | (556) | (265)
Less: valuation allowance, long-term | (230) | (113)
Net deferred income tax asset (liability), current | 3,824 | 3,325
Net deferred income tax asset (liability), long-term | $ 1,265 | $ 1,024

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