Registration of securities issued in business combination transactions

INITIAL PUBLIC OFFERING (Q3) (Details)

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INITIAL PUBLIC OFFERING (Q3) (Details) - $ / shares
9 Months Ended
Aug. 24, 2020
Aug. 18, 2020
Sep. 30, 2021
Dec. 31, 2020
Oct. 31, 2020
Initial Public Offering          
Subsidiary, Sale of Stock [Line Items]          
Number of units sold (in shares) 23,000,000        
Purchase price per unit $ 10.00 $ 10.00 $ 10.00 $ 10.00 $ 10.00
Over Allotment Option          
Subsidiary, Sale of Stock [Line Items]          
Number of units sold (in shares) 3,000,000        
Purchase price per unit $ 10.00 $ 10.00      
Class A Common Stock | Initial Public Offering          
Subsidiary, Sale of Stock [Line Items]          
Number of units sold (in shares)   20,000,000      
Purchase price per unit   $ 10.00 $ 11.50    
Number of ordinary shares per unit     1    
Number of public warrants per unit     1    
Warrants exercise ratio     1