Quarterly report pursuant to Section 13 or 15(d)

Income Taxes - Additional Information (Detail)

v3.19.1
Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Income Tax [Line Items]      
Income tax expense $ 134 $ 89  
Ireland      
Income Tax [Line Items]      
Net operating loss carryforwards $ 16,183   $ 13,648