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Goodwill and Intangible Assets - Goodwill (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]        
Impairment of goodwill $ 0 $ 0 $ 0 $ 0