v3.21.2
Summary of Significant Accounting Policies - Advertising (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Accounting Policies [Abstract]        
Advertising costs $ 1.0 $ 0.2 $ 1.7 $ 0.6