Registration of securities issued in business combination transactions

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - calculation of basic and diluted net loss per common stock (Q3) (Details)

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - calculation of basic and diluted net loss per common stock (Q3) (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Class A Common Stock            
Numerator:            
Allocation of net income (loss), as adjusted   $ 582,608 $ (304,448) $ 560,306 $ (192,876) $ (1,295,774)
Denominator:            
Weighted average shares outstanding, basic   23,650,000 10,858,152 23,650,000 3,645,803 8,674,180
Weighted average shares outstanding, diluted 0 23,650,000 10,858,152 23,650,000 3,645,803 8,674,180
Basic net income per common share $ 0.00 $ 0.02 $ (0.03) $ 0.02 $ (0.05) $ (0.15)
Diluted net income per common share $ 0.00 $ 0.02 $ (0.03) $ 0.02 $ (0.05) $ (0.15)
Class B Common Stock            
Numerator:            
Allocation of net income (loss), as adjusted   $ 141,649 $ (148,650) $ 136,226 $ (260,222) $ (765,995)
Denominator:            
Weighted average shares outstanding, basic   5,750,000 5,301,630 5,750,000 4,918,796 5,127,732
Weighted average shares outstanding, diluted 0 5,750,000 5,301,630 5,750,000 4,918,796 5,127,732
Basic net income per common share $ 0.00 $ 0.02 $ (0.03) $ 0.02 $ (0.05) $ (0.15)
Diluted net income per common share $ 0.00 $ 0.02 $ (0.03) $ 0.02 $ (0.05) $ (0.15)