Quarterly report pursuant to Section 13 or 15(d)

Income Taxes - Additional Information (Detail)

v3.19.3
Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Income Tax [Line Items]          
Income tax expense $ 104 $ 109 $ 395 $ 266  
Ireland          
Income Tax [Line Items]          
Net operating loss carryforwards $ 23,265   $ 23,265   $ 13,648