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BALANCE SHEET (FY) (Parenthetical) - $ / shares
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Stockholders' Deficit          
Preferred stock, par value (in dollars per share) $ 0.0001     $ 0.0001  
Preferred stock, shares authorized (in shares) 1,000,000     1,000,000  
Preferred stock, shares issued (in shares) 0     0  
Preferred stock, shares outstanding (in shares) 0     0  
Class A Common Stock [Member]          
LIABILITIES AND STOCKHOLDERS' DEFICIT          
Common stock subject to possible redemption (in shares) 13,225,000 13,225,000 13,225,000 13,225,000 13,225,000
Stockholders' Deficit          
Common stock, par value (in dollars per share) $ 0.0001     $ 0.0001  
Common stock, shares authorized (in shares) 200,000,000     200,000,000  
Common stock, shares issued (in shares) 0     0  
Common stock, shares outstanding (in shares) 0     0  
Class B Common Stock [Member]          
Stockholders' Deficit          
Common stock, par value (in dollars per share) $ 0.0001     $ 0.0001  
Common stock, shares authorized (in shares) 20,000,000     20,000,000  
Common stock, shares issued (in shares) 3,306,250     3,306,250  
Common stock, shares outstanding (in shares) 3,306,250     3,306,250