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Property and Equipment, net - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Property Plant And Equipment [Abstract]        
Depreciation expense $ 2.3 $ 1.3 $ 6.6 $ 3.3