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Income Taxes - Summary of Difference Between Effective Income Tax Rate Determined by Applying Statutory Income Tax Rate (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Summary of difference between effective income tax rate determined by applying statutory income tax rate
Benefit from U. S. federal statutory rate	$ 287	$ 1,071
Effect of discontinued operations	188	691
Change in valuation allowance	(429)	4,734
Accrual to return adjustments and other		235
Foreign income taxes included in equity earnings	(113)	496
Foreign income taxes	(178)
Non-deductible business meals and entertainment expenses	(46)	(45)
Effect of state income taxes		32
Change in enacted tax rate		(4,259)
Income tax expense (benefit)	$ (291)	$ 2,955

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