Income Taxes - Income Tax Provision (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Federal income taxes:
Current	$ 102	$ (37)	$ (356)
Deferred	(72)	(6)	113
State income taxes:
Current	13	(26)	(43)
Deferred	(9)	(1)	13
Income tax benefit (provision)	$ 34	$ (70)	$ (273)