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Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Deferred tax assets: |  |
Accounts receivable, due to allowance for doubtful accounts | $ 373 | $ 221
Inventories | 1,211 | 1,209
Operating loss carry-forwards | 5,784 | 2,744
Stock-based compensation expense | 1,106 | 874
Property and equipment, due to difference in depreciation | 1,978 | 841
Research and development tax credit carry-forwards | 6,247 | 5,640
Foreign tax credit carry-forwards | 2,345 | 2,345
State tax credit carry-forwards | 3,975 | 3,838
Capitalized research and development | 2,690 | 3,154
Warranty reserve | 277 | 429
Accrued expenses | 1,174 | 1,216
Lease liability | 700 | 1,574
Gross deferred tax assets | 27,860 | 24,085
Less valuation allowance | (27,080) | (22,432)
Total deferred tax assets | 780 | 1,653
Deferred tax liabilities: |  |
Purchased intangible assets | (199) | (384)
Property and equipment, due to differences in depreciation | (52) | (50)
Right of use asset | (688) | (1,564)
Total deferred tax liabilities | (939) | (1,998)
Net deferred tax liability | (159) | (345)
Deferred income tax asset | 56 | 73
Deferred income tax liability | $ (215) | $ (418)

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