Registration of securities issued in business combination transactions

DESCRIPTION OF ORGANIZATION AND BUSINESS OPERATIONS (Q3) (Details)

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DESCRIPTION OF ORGANIZATION AND BUSINESS OPERATIONS (Q3) (Details) - USD ($)
9 Months Ended 12 Months Ended
Jul. 29, 2021
Jul. 11, 2021
Feb. 21, 2021
Aug. 24, 2020
Aug. 18, 2020
Feb. 06, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Oct. 31, 2020
Aug. 20, 2020
Jan. 30, 2020
Dec. 31, 2019
Subsidiary, Sale of Stock [Line Items]                          
Proceeds from issuance               $ 25,000 $ 25,000        
Redemption price per share             $ 10.00   $ 10.00        
Cash outside the trust             $ 353,032            
Dissolution Expenses Payable             100,000            
Working capital deficit             $ 2,508,819            
Membership Interest Purchase Agreement [Member]                          
Subsidiary, Sale of Stock [Line Items]                          
Numerator for calculation   $ 32,500,000,000                      
Denominator for calculation   $ 10.00                      
Number of Escrow Units   6,000,000                      
Dividends Payable   $ 1,029,000,000                      
Sponsor [Member]                          
Subsidiary, Sale of Stock [Line Items]                          
Number of units sold (in shares)           5,750,000              
Fair value on assets held In trust (as a percent)             80.00%            
Redemption price per share             $ 10.00            
Business combination limit on net tangible assets             $ 5,000,001   $ 5,000,001        
Share redemption (as a percent)             100.00%            
Related party committed loan amount to consummate business combination $ 1,000,000                        
Sponsor [Member] | Maximum                          
Subsidiary, Sale of Stock [Line Items]                          
Share redemption (as a percent)             15.00%            
Related party committed loan amount to consummate business combination $ 250,000   $ 750,000                    
Class A Common Stock                          
Subsidiary, Sale of Stock [Line Items]                          
Common stock, par value                 $ 0.0001     $ 0.0001 $ 0.0001
Common Class V [Member] | Membership Interest Purchase Agreement [Member]                          
Subsidiary, Sale of Stock [Line Items]                          
Common stock, par value   $ 0.0001                      
New Warrants | Membership Interest Purchase Agreement [Member]                          
Subsidiary, Sale of Stock [Line Items]                          
Exercise price of warrants   $ 11.50                      
Initial Public Offering                          
Subsidiary, Sale of Stock [Line Items]                          
Number of units sold (in shares)       23,000,000                  
Share price       $ 10.00 $ 10.00   $ 10.00   $ 10.00 $ 10.00      
Proceeds from issuance IPO         $ 200,000,000                
Transaction cost             $ 13,128,937            
Underwriting fees             4,600,000            
Deferred underwriting fee             8,050,000            
Other offering costs             $ 478,937            
Initial Public Offering | Class A Common Stock                          
Subsidiary, Sale of Stock [Line Items]                          
Number of units sold (in shares)         20,000,000                
Share price         $ 10.00   $ 11.50            
Proceeds from issuance IPO         $ 200,000,000                
Private placement                          
Subsidiary, Sale of Stock [Line Items]                          
Number of units sold (in shares)         650,000                
Share price         $ 10.00                
Proceeds from issuance         $ 6,500,000                
Private placement | Class A Common Stock                          
Subsidiary, Sale of Stock [Line Items]                          
Exercise price of warrants             $ 11.50            
Over Allotment Option                          
Subsidiary, Sale of Stock [Line Items]                          
Number of units sold (in shares)       3,000,000                  
Share price       $ 10.00 $ 10.00                
Proceeds from issuance       $ 30,000,000                  
Aggregate proceeds held in the Trust Account                     $ 230,000,000