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Income Taxes - Summary of Reconciliation Between Federal Tax Rate (Details)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Statutory Federal rates	34.00%	34.00%
Increase (decrease) in income tax rate resulting from Tax on foreign activities	2.00%	(2.00%)
Increase (decrease) in income tax rate resulting from Other, net (primarily permanent differences)	(1.00%)	(200.00%)
Increase (decrease) in income tax rate resulting from Valuation allowance	(37.00%)	145.00%
Effective income tax rates	(2.00%)	(23.00%)

X

- Definition

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

+ References

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage 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 changes in the valuation allowance for deferred tax assets.

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Percentage 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 applicable to statutory income tax expense (benefit) outside of the country of domicile.

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