Income Taxes - Income Tax Expense (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Income Tax Expenses [Line Items]
Current	$ 44	$ 6	$ 84	$ 59
Deferred	18	15	67	79
Total	$ 62	$ 21	$ 151	$ 138