Income Taxes - Schedule of Components of Income Tax Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current provisions for income taxes:
State	$ 29	$ 5	$ 5
Foreign	158	67	32
Total current	187	72	37
Deferred tax provision (benefit):
Federal	93
State	21
Foreign	(55)	44	26
Total provision for income taxes	$ 246	$ 116	$ 63