Income Taxes - Loss Before Provision (Benefit) for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Domestic	$ (81,931)	$ (56,414)	$ (161,068)
Foreign	1,260	1,986	1,300
Loss before provision (benefit) for income taxes	$ (80,671)	$ (54,428)	$ (159,768)