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Income Taxes - Schedule of Components of Loss before Income Taxes (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]      
United States (U.S.) $ (55,087) $ (22,015) $ (15,698)
Non-U.S. (52,060) (58,285) (61,319)
Loss before income taxes $ (107,147) $ (80,300) $ (77,017)