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GOODWILL AND INTANGIBLE ASSETS, NET - Net Carrying Amount of Goodwill (Q2) (Details) - USD ($)
3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2020
Goodwill [Roll Forward]          
Goodwill at beginning of period $ 50,588,000 $ 17,320,857 $ 50,588,000   $ 50,588,000
Impairment of goodwill $ (33,267,143) 0 $ (33,267,143) $ 0 (33,267,143)
Goodwill at end of period   $ 17,320,857   $ 17,320,857 $ 17,320,857