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Income Taxes - Loss Before Provision for Income Taxes by Country (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Line Items]      
Loss before provision for income taxes $ (77,298) $ (156,115) $ (157,603)
Revenue Commissioners, Ireland [Member]      
Income Tax Disclosure [Line Items]      
Ireland (84,706) (163,653) (162,865)
Swiss Federal Tax Administration (FTA) [Member]      
Income Tax Disclosure [Line Items]      
Foreign (17) 384 480
U.S. Internal Revenue Service (IRS) [Member]      
Income Tax Disclosure [Line Items]      
Foreign $ 7,425 $ 7,154 $ 4,782