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Income Taxes - Components of Deferred Taxes (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred tax assets: |  |
Allowance for doubtful accounts | $ 328 | $ 499
Accrued liabilities not deducted for tax purposes | 3,358 | 3,431
Net operating loss carry forwards | 18,803 | 19,522
Tax credit carry forwards | 693 | 1,140
Charitable contributions carry forward | 4 | 5
Investment in partnerships | 367 | 382
Gross deferred tax assets | 23,553 | 24,979
Less: valuation allowance | (20,997) | (22,902)
Net deferred tax assets | 2,556 | 2,077
Deferred tax liabilities: |  |
Intangibles | (5,443) | (5,898)
Property, plant and equipment | (911) | (701)
Undistributed earnings of foreign subsidiaries | (1,056) | (1,191)
Gross deferred tax liabilities | (7,410) | (7,790)
Net deferred tax liabilities | $ (4,854) | $ (5,713)

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- Definition The tax effect as of the balance sheet date of the amount of the estimated future tax deductions arising from currently nondeductible expenses in accrued liabilities, which can only be deducted for tax purposes when such items are actually incurred, and which can only be realized if sufficient tax-basis income is generated in future periods to enable the deduction to be taken. + References No definition available. + Details
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