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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, 2018	Dec. 31, 2017
Deferred Tax Assets, Net [Abstract]
Allowance for doubtful accounts	$ 68	$ 51
Accrued compensation	731	505
AMT credit	58	30
Total book to tax difference in partnership	193	579
Net operating loss	2,654	1,312
Valuation allowance	(3,260)	(1,289)
Net deferred tax asset	$ 58	$ 30

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