Annual report pursuant to Section 13 and 15(d)

Income Taxes - Summary of Components of Income (Loss) Before Provision for Income Taxes (Detail)

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Income Taxes - Summary of Components of Income (Loss) Before Provision for Income Taxes (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
Ireland $ 532 $ 875 $ (50)
U.S. (77,116) (29,837) (13,301)
Total $ (76,584) $ (28,962) $ (13,351)