Income Taxes - Provision for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current
Federal		$ 0	$ 0
State	$ 34	66	127
Foreign	857	1,523	700
Total current provision	891	1,589	827
Deferred
Federal	63	109	0
State	(1)	6	0
Foreign	(271)	(523)	(50)
Total deferred provision	(209)	(408)	(50)
Provision for income taxes	$ 682	$ 1,181	$ 777