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STOCKHOLDERS' EQUITY (FY) (Details)
6 Months Ended 9 Months Ended
Dec. 31, 2020
$ / shares
shares
Sep. 30, 2021
$ / shares
shares
Jun. 30, 2021
shares
Mar. 31, 2021
shares
Sep. 30, 2020
shares
Stockholders' Equity [Abstract]          
Preferred stock, shares authorized (in shares) 1,000,000 1,000,000      
Preferred stock, par value (in dollars per share) | $ / shares $ 0.0001 $ 0.0001      
Preferred stock, shares issued (in shares) 0 0      
Preferred stock, shares outstanding (in shares) 0 0      
Stock conversion basis at time of business combination 1 1      
Stock conversion percentage threshold 20.00% 20.00%      
Class A Common Stock [Member]          
Stockholders' Equity [Abstract]          
Common stock, shares authorized (in shares) 200,000,000 200,000,000      
Common stock, par value (in dollars per share) | $ / shares $ 0.0001 $ 0.0001      
Voting right per share one vote        
Common stock, shares issued (in shares) 0 0      
Common stock, shares outstanding (in shares) 0 0      
Common stock subject to possible redemption (in shares) 13,225,000 13,225,000 13,225,000 13,225,000 13,225,000
Class B Common Stock [Member]          
Stockholders' Equity [Abstract]          
Common stock, shares authorized (in shares) 20,000,000 20,000,000      
Common stock, par value (in dollars per share) | $ / shares $ 0.0001 $ 0.0001      
Voting right per share one vote one vote      
Common stock, shares issued (in shares) 3,306,250 3,306,250      
Common stock, shares outstanding (in shares) 3,306,250 3,306,250