Registration of securities issued in business combination transactions

PERMANENT EQUITY AND TEMPORARY EQUITY - Common Stock Shares (FY) (Details)

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PERMANENT EQUITY AND TEMPORARY EQUITY - Common Stock Shares (FY) (Details)
12 Months Ended
Dec. 31, 2020
$ / shares
shares
Sep. 30, 2021
$ / shares
shares
Jan. 30, 2020
Vote
$ / shares
shares
Dec. 31, 2019
$ / shares
shares
Class A Common Stock        
Class of Stock [Line Items]        
Common shares, shares authorized (in shares) 100,000,000 100,000,000 100,000,000 100,000,000
Common shares, par value (in dollars per share) | $ / shares $ 0.0001   $ 0.0001 $ 0.0001
Common shares, votes per share | Vote     1  
Common shares, shares issued (in shares) 650,000 650,000   0
Common shares, shares outstanding (in shares) 650,000 650,000   0
Class A common stock subject to possible redemption, issued (in shares) 23,000,000     0
Class B Common Stock        
Class of Stock [Line Items]        
Common shares, shares authorized (in shares) 10,000,000 10,000,000 10,000,000 10,000,000
Common shares, par value (in dollars per share) | $ / shares $ 0.0001 $ 0.0001 $ 0.0001 $ 0.0001
Common shares, votes per share | Vote     1  
Common shares, shares issued (in shares) 5,750,000 5,750,000   0
Common shares, shares outstanding (in shares) 5,750,000 5,750,000   0
Ratio to be applied to the stock in the conversion 20