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Organization and Description of Busines - Basis of Presentation (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Organization and Description of Business        
Selling and marketing $ 9,386 $ 7,723 $ 30,263 $ 12,616