Quarterly report pursuant to Section 13 or 15(d)

Property and Equipment - Additional Information (Detail)

v3.20.1
Property and Equipment - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Property Plant And Equipment [Line Items]      
Depreciation expense $ 0.7 $ 0.4  
Leasehold Improvements      
Property Plant And Equipment [Line Items]      
Asset retirement obligation, asset $ 0.9   $ 1.0