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Income Taxes - Schedule of Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
Unrecognized tax benefits, Beginning Balance $ 1,104 $ 946 $ 830
Additions based on tax positions related to the current year 245 138 125
Additions for tax positions of prior years 120 29  
Settlements   (1)  
Lapse of statute (7) (8) (9)
Unrecognized tax benefits, Ending Balance $ 1,462 $ 1,104 $ 946