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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, 2017
Dec. 31, 2016
Deferred Tax Assets, Net [Abstract]    
Allowance for doubtful accounts $ 51 $ 59
Accrued compensation 505 627
AMT credit 30 65
Non-current    
Total book to tax difference in partnership (579) (404)
Net operating loss 1,312 79
Valuation allowance (1,289) 0
Net deferred tax asset $ 30 $ 426