Income Taxes - Significant Components of the Provision for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current:
Federal	$ (8)	$ 56	$ 113
State	39	101	44
Total Current Provision	31	157	$ 157
Deferred:
Federal	(1,451)	(1,866)
State	(281)	(245)
Total Deferred Provision (Benefit)	$ (1,732)	$ (2,111)