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Summary of Significant Accounting Policies - Advertising Costs (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Summary of Significant Accounting Policies        
Advertising costs $ 1.9 $ 3.0 $ 5.2 $ 6.1