XML 64 R53.htm IDEA: XBRL DOCUMENT v3.20.2
Property and Equipment - Additional Information (Details) - 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 $ 2.1 $ 2.1 $ 6.1 $ 5.9