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Income Taxes - Income Tax Expense (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]    
Current tax expense $ 2,443 $ 1,925
Deferred tax expense 1,283 428
Income tax expense 3,726 $ 2,353
Income tax expense due to re-measurement of net deferred tax assets $ 752