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 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Property Plant And Equipment [Line Items]          
Depreciation expense $ 0.8 $ 0.5 $ 1.5 $ 0.8  
Leasehold Improvements          
Property Plant And Equipment [Line Items]          
Asset retirement obligation, asset $ 0.9   $ 0.9   $ 1.0