Income Taxes - Schedule of Income Tax Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current income tax expense:
Domestic	$ 147	$ 114	$ 358
Foreign	1,614	225	158
Total income tax expense	1,761	339	516
Deferred income tax (benefit) expense:
Domestic	(360)	(23)	210
Foreign	102	24
Total income tax expense	(258)	1	210
Income tax expense	$ 1,503	$ 340	$ 726