Quarterly report pursuant to Section 13 or 15(d)

Property and Equipment - Additional Information (Detail)

v3.20.2
Property and Equipment - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Property Plant And Equipment [Line Items]          
Depreciation expense $ 1.2 $ 0.5 $ 2.7 $ 1.3  
Leasehold Improvements          
Property Plant And Equipment [Line Items]          
Asset retirement obligation, asset $ 0.8   $ 0.8   $ 1.0