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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]    
Deferred revenue $ 845 $ 1,019
Basis difference in intangible assets (56) 26
Inventory reserve 2,650 2,452
Net operating loss carryforwards 1,391 1,347
Research and development tax credits 88
Accrued expenses 92 165
Stock-based compensation 584 672
Allowance for sales returns and doubtful accounts 70 20
Difference in property and equipment basis (350) (423)
Other 743 886
Total net deferred income tax asset 6,057 6,164
Less: Valuation allowance (1,404) (1,071)
Net deferred income tax asset (liability) $ 4,654 $ 5,093