Income Taxes - Schedule of Provision for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current
Federal		$ (184)	$ 3,684
State	$ 1,103	258	555
Foreign	540	652	599
Deferred
Federal	3,011	10,262	(1,337)
State	224	(291)	(169)
Foreign	(410)	(355)	(577)
Total provision for income taxes	$ 4,468	$ 10,342	$ 2,755