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Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Deferred tax assets: |  |  |
Accounts receivable, due to allowance for doubtful accounts | $ 582 |  | $ 540
Inventories | 718 |  | 581
Operating loss carry-forwards | 3,064 |  | 4,725
Stock-based compensation expense | 762 |  | 696
Property and equipment, due to difference in depreciation | 173 |  | 190
Research and development, alternative minimum tax credit carry-forwards | 4,716 |  | 4,338
Foreign tax credit carry-forwards | 2,360 |  | 2,958
State tax credit carry-forwards | 2,977 |  | 2,958
Capitalized research and development | 3,130 |  | 0
Warranty reserve | 454 |  | 495
Accrued expenses | 556 |  | 334
Gross deferred tax assets | 19,492 |  | 17,815
Less valuation allowance | (18,144) |  | (16,014)
Total deferred tax assets | 1,348 |  | 1,801
Deferred tax liabilities: |  |  |
Purchased intangible assets | (1,810) |  | (2,705)
Property and equipment, due to differences in depreciation | (994) |  | (1,681)
Other | (18) |  | (29)
Total deferred tax liabilities | (2,822) |  | (4,415)
Net deferred tax liability | (1,474) |  | (2,614)
Net deferred tax asset- non-current | 226 | $ 222 | 20
Net deferred tax liability- non-current | $ (1,700) |  | $ (2,634)

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