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Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Components of Deferred Tax Assets and Liabilities [Abstract]    
Deferred revenue $ 1,019 $ 1,120
Basis difference in intangible assets 26 42
Inventory reserve 2,452 2,213
Net operating loss carryforwards 1,347 957
Research and development tax credits 0 60
Accrued expenses 165 292
Stock-based compensation 672 577
Allowance for sales returns and doubtful accounts 20 22
Difference in property and equipment basis (423) (318)
Other 886 910
Total net deferred income tax asset 6,164 5,875
Less: Valuation allowance (1,071) (786)
Net deferred income tax asset (liability) $ 5,093 $ 5,089