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Income Taxes - Provision for Income Taxes and Effective Income Tax Rates (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Income Tax Disclosure [Abstract]        
Provision for income taxes $ 266 $ 227 $ 805 $ 724
Effective income tax rate 4.30% 1.70% 5.90% 2.80%