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Warrant Liability (Q3) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Jul. 16, 2021
Jun. 07, 2019
Sep. 30, 2021
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Jun. 16, 2021
Derivative [Line Items]                
Unit price (in dollars per share)   $ 11.50            
Notice period to redeem warrants 30 days              
Threshold trading days 20 days              
Trading period 30 days              
Change in fair value of warrant liability     $ 45,837 $ 83,600 $ 0 $ 83,628 $ 0  
Common Stock                
Derivative [Line Items]                
Stock price trigger (in dollars per share) $ 18.00              
Public Warrants                
Derivative [Line Items]                
Warrants outstanding (in shares)     12,499,933 12,499,933   12,499,933    
Units issued (in shares)   12,500,000            
Warrant redemption price (in dollars per share) $ 0.01              
Private Placement Warrant                
Derivative [Line Items]                
Warrants outstanding (in shares)     7,000,000 7,000,000   7,000,000   7,000,000
Number of ordinary shares called by each warrant (in shares)     1 1   1    
Warrants issued (in shares)     7,000,000          
Limitation period to transfer, assign or sell warrants     30 days          
Class A Common Stock                
Derivative [Line Items]                
Number of ordinary shares called by each warrant (in shares)   1            
Exercise price of warrant (in dollars per share)     $ 11.50 $ 11.50   $ 11.50