Income Taxes - Schedule of Income Tax (Benefit) Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current income tax expense:
Domestic	$ 42	$ 147	$ 114
Foreign	1,856	1,614	225
Total income tax expense	1,898	1,761	339
Deferred income tax (benefit) expense:
Domestic	147	(360)	(23)
Foreign	(8,875)	102	24
Total income tax expense	(8,728)	(258)	1
Income tax (benefit) expense	$ (6,830)	$ 1,503	$ 340