Annual report pursuant to Section 13 and 15(d)

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

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Income Taxes - Summary of Components of Provision for Income Taxes (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Current      
Ireland $ 472 $ 444 $ 113
Total Current 472 444 113
Deferred      
Income Tax Provision $ 472 $ 444 $ 113