Income Taxes - Provision for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current:
Federal	$ (305)	$ (4,530)	$ (950)
State	116	129	181
International	2,958	273	2,738
Deferred:
Federal	0	0	(713)
International	1,318	2,376	(9,372)
Total provision for (benefit from) income taxes	$ 4,087	$ (1,752)	$ (8,116)