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Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Income Tax Disclosure [Abstract]        
Income tax provision $ 200 $ 274 $ 956 $ 444
Effective income tax rate (0.20%) 0.20% (0.40%) 1.20%