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FAIR VALUE MEASUREMENTS, Changes in Fair Value of Warrant Liabilities (FY) (Details) - USD ($)
3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Dec. 31, 2020
Sep. 30, 2021
Sep. 22, 2020
Changes In Fair Value Of Warrant Liabilities [Roll Forward]            
Transfers out of Level 3 into Level 1 $ 0       $ 0  
Warrant Liabilities [Member]            
Changes In Fair Value Of Warrant Liabilities [Roll Forward]            
Fair value, beginning of period   $ 10,668,000 $ 0 $ 0 14,600,000  
Initial measurement on September 22, 2020     10,682,000      
Change in fair value of warrant liabilities   3,932,000 (14,000)      
Fair value, end of period   14,600,000 10,668,000 14,600,000    
Private Placement Warrants [Member]            
Changes In Fair Value Of Warrant Liabilities [Roll Forward]            
Fair value, beginning of period   4,194,000 0 0 5,673,000  
Initial measurement on September 22, 2020     4,200,000      
Change in fair value of warrant liabilities   1,479,000 (6,000)      
Fair value, end of period   5,673,000 4,194,000 5,673,000    
Public Warrants [Member]            
Changes In Fair Value Of Warrant Liabilities [Roll Forward]            
Fair value, beginning of period   6,474,000 0 0 $ 8,927,000  
Initial measurement on September 22, 2020     6,482,000      
Change in fair value of warrant liabilities   2,453,000 (8,000)      
Fair value, end of period   $ 8,927,000 $ 6,474,000 8,927,000    
Number of securities to be called by each unit (in shares)           0.5
Transfers out of Level 3 into Level 1       $ 6,482,000    
Class A Common Stock [Member]            
Changes In Fair Value Of Warrant Liabilities [Roll Forward]            
Number of securities to be called by each unit (in shares) 1       1 1