Income Taxes - Provision (Benefit) for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current:
Federal	$ (2,001)	$ 113	$ 1,529
State	(216)	5	126
Foreign	8	148	29
Current, total	(2,209)	266	1,684
Deferred:
Federal	(93)	114	495
State	(11)	26	7
Foreign	0	0	0
Deferred, total	(104)	140	502
Total income tax (benefit) provision	$ (2,313)	$ 406	$ 2,186