Quarterly report pursuant to Section 13 or 15(d)

Income Taxes - Additional Information (Detail)

v3.10.0.1
Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Income Tax [Line Items]          
Income tax expense $ 68 $ 78 $ 157 $ 305  
Ireland          
Income Tax [Line Items]          
Net operating loss carryforwards $ 8,886   $ 8,886   $ 5,409