Annual report pursuant to Section 13 and 15(d)

Details of Certain Consolidated Balance Sheet Accounts - Additional Information (Details)

v3.21.1
Details of Certain Consolidated Balance Sheet Accounts - Additional Information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Property Plant And Equipment [Abstract]      
Depreciation and amortization expense $ 5.4 $ 4.9 $ 3.9