Quarterly report pursuant to Section 13 or 15(d)

Income Taxes - Additional Information (Detail)

v3.19.2
Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Income Tax [Line Items]          
Income tax expense $ 157 $ 68 $ 291 $ 157  
Ireland          
Income Tax [Line Items]          
Net operating loss carryforwards $ 19,066   $ 19,066   $ 13,648