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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, 2017	Dec. 31, 2016
Summary of difference between effective income tax rate determined by applying statutory income tax rate
(Provision for) benefit from U.S federal statutory rate	$ 1,762	$ 2,385
Effect of state income taxes	32	51
Non-deductible business meals and entertainment expenses	(45)	(11)
Foreign income taxes included in equity in earnings	496	140
Accrual to return adjustments and other	235	81
Change in valuation allowance	4,734	(2,690)
Change in enacted tax rate	(4,259)
Total (expense)	$ 2,955	$ (44)

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Income tax reconciliation accrual to return adjustments and other.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to increase (decrease) in the income tax rates.

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