Annual report pursuant to Section 13 and 15(d)

Property and Equipment - Additional Information (Detail)

v3.20.4
Property and Equipment - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Property Plant And Equipment [Line Items]    
Depreciation expense $ 4.1 $ 2.0
Leasehold Improvements    
Property Plant And Equipment [Line Items]    
Asset retirement obligation, asset $ 0.8 $ 1.0