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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