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Fixed Assets - Additional Information (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Property Plant And Equipment [Abstract]        
Depreciation expense on fixed assets $ 2,500,000 $ 722,000 $ 6,700,000 $ 1,800,000