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Related Party Transactions (Q3) (Details) - USD ($)
3 Months Ended 9 Months Ended
Jul. 06, 2021
Jan. 12, 2021
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Related Party Transaction [Line Items]            
Number of shares issued (shares)   20,000,000        
The Offering            
Related Party Transaction [Line Items]            
Transaction costs $ 500,000          
Class 1 Common Stock | The Offering            
Related Party Transaction [Line Items]            
Number of shares issued (shares) 10,350,000          
Price per share (USD per share) $ 12.25          
Proceeds from issuance of common stock $ 126,800,000          
Related Party Customer            
Related Party Transaction [Line Items]            
Revenue from related parties         $ 200,000 $ 200,000
Portfolio Companies            
Related Party Transaction [Line Items]            
Revenue from related parties     $ 100,000 $ 0 100,000 100,000
Expenses from related parties         $ 100,000 $ 100,000