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Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Income Tax Disclosure [Abstract]        
Income tax provision $ 707 $ 8 $ 1,330 $ 84
Effective income tax rate (2.90%) (0.10%) (2.00%) (0.20%)