Registration of securities issued in business combination transactions

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Class A common stock reflected in the balance sheet (Q3) (Details)

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Class A common stock reflected in the balance sheet (Q3) (Details) - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Aug. 18, 2020
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES        
Gross proceeds $ 230,000,000 $ 230,000,000    
Less: Proceeds allocated to Public Warrants (13,225,000) (13,225,000)    
Class A common stock issuance costs 12,292,456 (12,292,456)    
Plus: Accretion of carrying value to redemption value 25,517,456 25,517,456    
Class A common stock subject to possible redemption $ 230,000,000 $ 230,000,000 $ 230,000,000 $ 200,000,000