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RELATED PARTY TRANSACTIONS - Board of Directors Compensation (Q2) (Details) - Director - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Related Party Transaction [Line Items]        
Value of shares issued for services rendered $ 110,000 $ 70,000 $ 180,000 $ 72,083
Total $ 170,000 $ 70,000 $ 240,000 $ 103,333
Common stock issued to board of directors (in shares) 4,470 2,272 7,510 2,355
Cash paid for services rendered        
Related Party Transaction [Line Items]        
Cash paid for services rendered $ 60,000 $ 0 $ 60,000 $ 31,250