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Summary of Significant Accounting Policies, Income Taxes (FY) (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Taxes [Abstract]              
Provision for income tax $ 393,000 $ 0 $ 242,000 $ 0 $ 0 $ 1,321,045 $ 0
Net income (loss) before provision for income taxes         38,829,993 945,360 12,679,511
United States              
Income Taxes [Abstract]              
Net income (loss) before provision for income taxes         38,877,652 (4,152,308) 12,010,276
Foreign              
Income Taxes [Abstract]              
Net income (loss) before provision for income taxes         $ (47,659) $ 5,097,668 $ 669,235