Income Taxes - Schedule of Income Tax Provision (Benefit) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current tax provision (benefit):
Federal	$ 0	$ 0	$ 0
State	157	50	79
Foreign	965	1,015	142
Total current tax provision (benefit)	1,122	1,065	221
Deferred tax provision (benefit):
Federal	103	50	(1,025)
State	26	23	(206)
Foreign	0	0	0
Total deferred tax expense	129	73	(1,231)
Provision for (benefit from) income taxes	$ 1,251	$ 1,138	$ (1,010)