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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
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