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Summary of Significant Accounting Policies - Marketing and Selling Expenses (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Accounting Policies [Abstract]        
Marketing and selling expenses $ 95,943 $ 34,518 $ 193,066 $ 176,842