Income Taxes - Components of (Benefit) Provision for Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current:
Federal		$ (117)	$ 948	$ 61
State		246	399	(1,294)
Foreign		84	41	69
Total current provision (benefit)		213	1,388	(1,164)
Deferred:
Federal		(2,545)	(4,624)	(5,267)
State		(63)	0	2,488
Foreign		4	18	34
Total deferred benefit		(2,604)	(4,606)	(2,745)
Benefit for income taxes	$ (3,909)	$ (2,391)	$ (3,218)	$ (3,909)