Income Taxes - Components of (Benefit) Provision for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current:
Federal	$ 0	$ (615)	$ (117)
State	755	314	246
Foreign	6,575	57	84
Total current provision (benefit)	7,330	(244)	213
Deferred:
Federal	(9,970)	131	(2,545)
State	(7,944)	238	(63)
Foreign	(215)	4	4
Total deferred (benefit) provision	(18,129)	373	(2,604)
(Benefit) provision for income taxes	$ (10,799)	$ 129	$ (2,391)