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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 expense (benefit) $ (218) $ 0 $ (218) $ 0
Effective tax rate 1.90% 0.00% 0.70% 0.00%
Deferred tax assets $ 200   $ 200  
Discrete tax benefit     $ 200