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Income Tax Expense - Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits (Detail)
$ in Thousands
6 Months Ended
Jun. 30, 2018
USD ($)
Income Tax Disclosure [Abstract]  
Unrecognized tax benefits as of December 31, 2017 $ 525
Additions for tax positions of current year 48
Additions for tax positions of prior years 5
Reductions for settlements with taxing authorities 0
Reductions for lapses of the applicable statutes of limitations 0
Unrecognized tax benefits as of June 30, 2018 $ 578