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Income Taxes - Loss Before Provision for Income Taxes by Region (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]      
Ireland $ (83,009) $ (9,714) $ (42,523)
U.S. 3,098 3,375 1,942
Loss before provision for income taxes $ (79,911) $ (6,339) $ (40,581)