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Note 12 - Income Taxes - Net Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Deferred revenue $ 50 $ 738
Basis difference in intangible assets 3,283 3,403
Inventory reserve 2,235 2,089
Net operating loss carryforwards 4,067 1,627
Research and development tax credits 794 163
Accrued expenses 143 75
Stock-based compensation 362 327
Allowance for sales returns and doubtful accounts 160 119
Difference in property and equipment basis (185) (212)
Other 551 438
Total net deferred income tax asset 11,460 8,767
Less: Valuation allowance (11,460) (2,236)
Net deferred income tax asset (liability) $ 6,531