Business and Basis of Presentation - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Net loss	$ (70,972)	$ (52,454)
Net cash used in operating activities	$ (35,028)	$ (50,023)