Income Taxes - Schedule of Components of (Benefit from) Provision of Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current income tax provision
Federal	$ 0	$ 0	$ 0
State	58	111	101
Foreign	1,708	1,193	700
Total current income tax provision	1,766	1,304	801
Deferred income tax benefit
Federal	0	0	(2,094)
State	0	0	(191)
Foreign	(362)	(299)	28
Total deferred income tax benefit	(362)	(299)	(2,257)
Provision for (benefit from) income taxes	$ 1,404	$ 1,005	$ (1,456)