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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