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v3.8.0.1

Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Deferred tax assets: |  |
Accounts receivable, due to allowance for doubtful accounts | $ 540 | $ 1,104
Inventories | 581 | 792
Operating loss carry-forwards | 4,725 | 3,078
Stock-based compensation expense | 696 | 1,231
Property and equipment, due to difference in depreciation | 190 | 148
Research and development, alternative minimum tax credit carry-forwards | 4,338 | 3,031
Foreign tax credit carry-forwards | 2,958 | 754
State tax credit carry-forwards | 2,958 | 2,277
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Warranty Reserves | 495 | 822
Accrued expenses | 334 | 432
Gross deferred tax assets | 17,815 | 13,669
Less valuation allowance | (16,014) | (11,567)
Total deferred tax assets | 1,801 | 2,102
Deferred tax liabilities: |  |
Purchased intangible assets | (2,705) | (3,197)
Property and equipment, due to differences in depreciation | (1,681) | (2,003)
Other | (29) | (11)
Total deferred tax liabilities | (4,415) | (5,211)
Net deferred tax liability | (2,614) | (3,109)
Net deferred tax asset--non-current | 20 | 24
Net deferred tax liability- non-current | $ (2,634) | $ (3,133)

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