Income Taxes - Summary of Components of Income Tax Expense (Benefit) (Detail) - USD ($) $ in Thousands	3 Months Ended						12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current income taxes
Federal							$ 0	$ 0	$ 0
State							0	0	0
Foreign							0	0	0
Deferred income taxes
Federal							0	0	0
State							0	0	$ 0
Foreign							(5,523)	(1,024)
Income tax benefit	$ (816)	$ (1,070)	$ (992)	$ (2,645)	$ (925)	$ (99)	$ (5,523)	$ (1,024)