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Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Deferred tax assets:    
Accounts receivable, due to allowance for doubtful accounts $ 900 $ 664
Inventories 562 531
Operating loss carry-forwards 2,094 1,939
Stock-based compensation expense 1,981 1,743
Property and equipment, due to difference in depreciation 209 1,334
Research and development, alternative minimum tax credit carry-forwards 3,111 3,313
Foreign tax credit carry-forwards 0 725
State tax credit carry-forwards 2,228 2,176
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Warranty Reserves 675 682
Accrued expenses 424 505
Gross deferred tax assets 12,184 13,612
Less valuation allowance (4,688) (4,157)
Total deferred tax assets 7,496 9,455
Deferred tax liabilities:    
Purchased intangible assets (4,944) (6,917)
Property and equipment, due to differences in depreciation (2,849) (2,410)
Other (114) (130)
Total deferred tax liabilities (7,907) (9,457)
Net deferred tax liability (411) (2)
Net deferred tax asset—current 0 2,772
Net deferred tax asset--non-current 4,686 2,690
Net deferred tax liability—non-current $ (5,097) $ (5,464)