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STOCKHOLDERS' EQUITY (Q3) (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      
Minimum percentage of common stock voting required to amend   90.00%      
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) 13,225,000 13,225,000      
Common stock, shares outstanding (in shares) 13,225,000 13,225,000 13,225,000 13,225,000 13,225,000
Common stock, shares issued (in shares) 0 0      
Common stock, shares outstanding (in shares) 0 0      
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