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Income Taxes - Tax Effect of Each Type of Temporary Difference and Carry Forward that Gives Rise to Deferred Tax Asset (Detail) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Gross Deferred Tax Assets: |  |
Allowance for doubtful accounts | $ 133 | $ 117
Accrued compensation | 547 | 870
Net operating loss | 6,541 | 4,741
AMT credit | 0 | 29
Gross Deferred Tax Assets | 7,221 | 5,757
Less: Valuation Allowance | (7,070) | (5,625)
Total Deferred Tax Assets Net of Valuation Allowance | 151 | 132
Gross Deferred Tax Liabilities: |  |
Total Book/tax difference in partnership | 151 | 103
Gross Deferred Tax Liabilities: | $ 151 | 103
Net, Deferred Tax Assets: |  | $ 29

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