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Intangible Assets (FY) (Tables)
 9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Intangible Assets [Abstract]    
Intangible Assets, Net
Intangible assets consisted of the following as of September 30, 2021 and December 31, 2020 (in thousands):
 
 
  
September 30, 2021
  
 
  
Weighted Average
Amortization Period
(Years)
    
Gross Intangible
Assets
    
Accumulated
Amortization
    
Net Intangible
Assets
  
Trade and domain names
    
14.3
    
$
7,713
    
$
(3,917
)
  
$
3,796
  
Software technology
    
7.7
      
5,694
      
(2,976
)
    
2,718
  
Customer relationships
    
3.4
      
1,932
      
—
      
1,932
  
Total intangible assets
    
10.5
    
$
15,339
    
$
(6,893
)
  
$
8,446
  

 
December 31, 2020
  
 
Weighted Average
Amortization Period
(Years)
  
Gross Intangible
Assets
  
Accumulated
Amortization
  
Net Intangible
Assets
  
Trade and domain names
     15.0    
$
7,255
    
$
(3,556
)
  
$
3,699
  
Software technology
    
9.4
      
3,469
      
(2,663
)
    
806
  
Total intangible assets
    
13.2
    
$
10,724
    
$
(6,219
)
  
$
4,505
  
Intangible assets consisted of the following as of December 31, 2020 and 2019:
 
 
  
2019
    
2020
  
Trade and domain names
  
$
7,255,381
    
$
7,255,381
  
Software technology
    
3,468,534
      
3,468,534
  
 
    
10,723,915
      
10,723,915
  
Less: accumulated amortization
    
(5,320,959
)
    
(6,219,507
)
Total intangible assets
  
$
5,402,956
    
$
4,504,408