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GOODWILL AND INTANGIBLE ASSETS, NET - Net Carrying Amount of Goodwill (Details) - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Goodwill [Roll Forward]      
Beginning balance $ 17,320,857 $ 50,588,000 $ 50,588,000
Impairment of goodwill for the nine and the 12 months period ended, respectively 0 $ (33,267,143) (33,267,143)
Ending balance $ 17,320,857   $ 17,320,857