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Income Taxes - Net Deferred Tax Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Net deferred tax assets:    
Deferred tax assets—current $ 10us-gaap_DeferredTaxAssetsNetCurrent $ 12us-gaap_DeferredTaxAssetsNetCurrent
Deferred tax assets—non-current 391us-gaap_DeferredTaxAssetsNetNoncurrent 304us-gaap_DeferredTaxAssetsNetNoncurrent
Deferred tax liability (144)us-gaap_DeferredTaxLiabilitiesNoncurrent (144)us-gaap_DeferredTaxLiabilitiesNoncurrent
Net deferred tax assets $ 257us-gaap_DeferredTaxAssetsLiabilitiesNet $ 172us-gaap_DeferredTaxAssetsLiabilitiesNet