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Intangible Assets (FY) (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
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Gross intangible assets | $ 15,339,000 |  | $ 15,339,000 |  | $ 10,723,915 | $ 10,723,915 |
Less: 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 | 200,000 | $ 200,000 | $ 700,000 | $ 700,000 | $ 898,548 | 3,385,613 | $ 882,120
Accelerated amortization expense |  |  |  |  |  | 2,479,029 |
Useful life of asset |  |  | 10 years 6 months |  | 13 years 2 months 12 days |  |
Trade and Domain Names |  |  |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Gross intangible assets | 7,713,000 |  | $ 7,713,000 |  | $ 7,255,381 | 7,255,381 |
Less: accumulated amortization | (3,917,000) |  | (3,917,000) |  | (3,556,000) |  |
Total intangible assets | 3,796,000 |  | $ 3,796,000 |  | $ 3,699,000 |  |
Useful life of asset |  |  | 14 years 3 months 18 days |  | 15 years |  |
Software Technology |  |  |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Gross intangible assets | 5,694,000 |  | $ 5,694,000 |  | $ 3,468,534 | $ 3,468,534 |
Less: accumulated amortization | (2,976,000) |  | (2,976,000) |  | (2,663,000) |  |
Total intangible assets | $ 2,718,000 |  | $ 2,718,000 |  | $ 806,000 |  |
Useful life of asset |  |  | 7 years 8 months 12 days |  | 9 years 4 months 24 days |  |
Marketing Project |  |  |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Useful life of asset |  |  |  |  | 3 years |  |

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