Income Taxes - Components of Income Tax (Benefit) Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current:
Federal	$ 0	$ 0	$ 0
State	1	1	1
Current Income Tax Expense (Benefit), total	1	1	1
Deferred:
Federal	(17)	0	(20)
State	(2)	0	(4)
Deferred Income Tax Expense (Benefit), total	(19)	0	(24)
Income tax (benefit) expense	$ (18)	$ 1	$ (23)