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Goodwill and Intangible Assets (Q3) (Details) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Changes in goodwill              
Beginning balance     $ 3,961,122 $ 3,961,122 $ 3,961,122    
Ending balance $ 45,658,000   $ 45,658,000   $ 3,961,122 $ 3,961,122  
Total intangible assets              
Weighted Average Amortization Period (Years)     10 years 6 months   13 years 2 months 12 days    
Gross Intangible Assets 15,339,000   $ 15,339,000   $ 10,723,915 10,723,915  
Accumulated Amortization (6,893,000)   (6,893,000)   (6,219,507) (5,320,959)  
Total intangible assets 8,446,000   8,446,000   4,504,408 5,402,956  
Amortization expense for intangible assets 200,000 $ 200,000 700,000 $ 700,000 898,548 3,385,613 $ 882,120
Estimated future amortization expense of intangible assets              
Remaining period in 2021 (three months) 611,000   611,000        
Year ended December 31, 2022 2,057,000   2,057,000        
Year ended December 31, 2023 1,659,000   1,659,000        
Year ended December 31, 2024 1,442,000   1,442,000        
Year ended December 31, 2025 1,017,000   1,017,000        
Thereafter 1,660,000   1,660,000        
Total intangible assets 8,446,000   $ 8,446,000   $ 4,504,408 5,402,956  
Trade and domain names              
Total intangible assets              
Weighted Average Amortization Period (Years)     14 years 3 months 18 days   15 years    
Gross Intangible Assets 7,713,000   $ 7,713,000   $ 7,255,381 7,255,381  
Accumulated Amortization (3,917,000)   (3,917,000)   (3,556,000)    
Total intangible assets 3,796,000   3,796,000   3,699,000    
Estimated future amortization expense of intangible assets              
Total intangible assets 3,796,000   $ 3,796,000   $ 3,699,000    
Software technology              
Total intangible assets              
Weighted Average Amortization Period (Years)     7 years 8 months 12 days   9 years 4 months 24 days    
Gross Intangible Assets 5,694,000   $ 5,694,000   $ 3,468,534 $ 3,468,534  
Accumulated Amortization (2,976,000)   (2,976,000)   (2,663,000)    
Total intangible assets 2,718,000   2,718,000   806,000    
Estimated future amortization expense of intangible assets              
Total intangible assets 2,718,000   $ 2,718,000   $ 806,000    
Customer relationships              
Total intangible assets              
Weighted Average Amortization Period (Years)     3 years 4 months 24 days        
Gross Intangible Assets 1,932,000   $ 1,932,000        
Accumulated Amortization 0   0        
Total intangible assets 1,932,000   1,932,000        
Estimated future amortization expense of intangible assets              
Total intangible assets $ 1,932,000   1,932,000        
TLH              
Changes in goodwill              
Acquisition of     14,648,000        
Sprout              
Changes in goodwill              
Acquisition of     $ 27,049,000