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Organization and Nature of Business (FY) (Details)
$ / shares in Units, $ in Thousands
12 Months Ended
May 14, 2021
Jan. 12, 2021
USD ($)
$ / shares
shares
Oct. 18, 2020
USD ($)
$ / shares
shares
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Business Combination Agreement [Abstract]            
Common stock subscriptions (in shares) | shares   20,000,000        
Aggregate purchase price   $ 200,000        
Retroactive Adjustments Related to Reverse Recapitalization [Abstract]            
Preferred stock dividends       $ 8,670 $ 8,682 $ 9,298
Accretion of preferred stock to redemption value       $ 8,670 $ 8,682 $ 9,298
Subsequent Event [Member]            
Business Combination Agreement [Abstract]            
Purchase price (in dollars per share) | $ / shares   $ 10.00        
PIPE Financing [Member]            
Business Combination Agreement [Abstract]            
Common stock subscriptions (in shares) | shares   20,000,000 20,000,000      
Purchase price (in dollars per share) | $ / shares   $ 10.00 $ 10.00      
Aggregate purchase price   $ 200,000 $ 200,000      
Common Class I [Member] | Billtrust [Member] | Forecast [Member]            
Retroactive Adjustments Related to Reverse Recapitalization [Abstract]            
Stock exchange ratio 7.2282662