Registration of securities issued in business combination transactions

INITIAL PUBLIC OFFERING (FY) (Details)

v3.21.4
INITIAL PUBLIC OFFERING (FY) (Details) - $ / shares
12 Months Ended
Aug. 24, 2020
Aug. 20, 2020
Aug. 18, 2020
Dec. 31, 2020
Sep. 30, 2021
Oct. 31, 2020
Subsidiary, Sale of Stock [Line Items]            
Number of warrants in a unit       1    
Public Warrants            
Subsidiary, Sale of Stock [Line Items]            
Exercise price of warrants         $ 0.01  
Initial Public Offering            
Subsidiary, Sale of Stock [Line Items]            
Number of units sold (in shares)   23,000,000 20,000,000      
Purchase price, per unit $ 10.00   $ 10.00 $ 10.00 $ 10.00 $ 10.00
Initial Public Offering | Public Warrants            
Subsidiary, Sale of Stock [Line Items]            
Number of shares in a unit 1          
Number of warrants in a unit 0.5          
Number of shares issuable per warrant 1          
Exercise price of warrants $ 11.50          
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