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Income Taxes - Significant Portions of Deferred Tax Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred tax assets-current:    
Tax loss carried forwards of a subsidiary $ 74us-gaap_DeferredTaxAssetsNetCurrent $ 37us-gaap_DeferredTaxAssetsNetCurrent