Income Taxes - Expense (Benefit) for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Income Tax Expenses [Line Items]
Current	$ 1,054	$ 303
Deferred	(88)	(490)
Income Tax Expense (Benefit), Total	$ 966	$ (187)