Registration of securities issued in business combination transactions

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

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PERMANENT EQUITY AND TEMPORARY EQUITY - Preferred Stock Shares (FY) (Details) - $ / shares
Sep. 30, 2021
Dec. 31, 2020
Jan. 30, 2020
Dec. 31, 2019
STOCKHOLDER'S EQUITY        
Preferred stock shares authorized 1,000,000 1,000,000 1,000,000 1,000,000
Preferred stock, par value, (per share) $ 0.0001 $ 0.0001 $ 0.0001 $ 0.0001
Preferred shares, shares issued 0 0   0
Preferred stock shares outstanding 0 0   0