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Members' Equity (FY) (Tables) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Members' Equity [Abstract] |  |
Issuances of Class A-3 and Class B Unit Activities | A summary of the Class P Unit activity for the nine months ended September 30, 2021 is as follows:
|  | Number of Units |
Outstanding Class A-3 and Class B Units, December 31, 2020 |  |  | 274,816 |
Repurchases |  |  | (8,279 | )
Cancellations |  |  | (4,288 | )
Outstanding Class A-3 and Class B Units, June 15, 2021 (Pre-Business Combination) |  |  | 262,249 |
Class A-3 Units outstanding exchanged for Class A Units in connection with the Business Combination |  |  | (53,333 | )
Recapitalization in connection with the Business Combination |  |  | 25,687,126 |
Outstanding Class P Units, June 16, 2021 |  |  | 25,896,042 |
Cancellations |  |  | (216,920 | )
Outstanding Class P Units, September 30, 2021 |  |  | 25,679,122 |
Vested, September 30, 2021 |  |  | 23,197,454 |
| The following presents issuances of Class A-3 and Class B Units during the years ended December 31, 2020, 2019 and 2018:
Outstanding at December 31, 2017 |  |  | 252,241 |
Granted |  |  | 44,125 |
Repurchase |  |  | (12,391 | )
Cancellations |  |  | (38,604 | )
Outstanding at December 31, 2018 |  |  | 245,371 |
Granted |  |  | 25,990 |
Cancellations |  |  | (7,284 | )
Outstanding at December 31, 2019 |  |  | 264,077 |
Granted |  |  | 14,250 |
Repurchase |  |  | (1,900 | )
Cancellations |  |  | (1,611 | )
Outstanding at December 31, 2020 |  |  | 274,816 |
Vested as of December 31, 2019 |  |  | 207,398 |
Vested as of December 31, 2020 |  |  | 234,114 |
Unvested Class A-3 and Class B Units |  | The following presents a summary of unvested Class A-3 and Class B Units during the years ended December 31, 2020, 2019 and 2018:
|  |  |  |  | Weighted - Average |  |  |  |
|  | Units |  |  | Grant Date Fair Value |  |  | Remaining Years to Vest |  |  | Remaining Unrecognized |
Nonvested, December 31, 2018 |  |  | 62,024 |  |  | $ | 236.37 |  |  |  | 3.09 |  |  | $ | 12,215,953 |
Granted |  |  | 25,990 |  |  |  | 531.80 |  |  |  |  |  |  |  |  |
Vested |  |  | (24,051 | ) |  |  | 231.74 |  |  |  |  |  |  |  |  |
Cancelled |  |  | (7,284 | ) |  |  | 238.87 |  |  |  |  |  |  |  |
Nonvested, December 31, 2019 |  |  | 56,679 |  |  | $ | 373.47 |  |  |  | 2.65 |  |  | $ | 18,682,331 |
Granted |  |  | 14,250 |  |  |  | 724.28 |  |  |  |  |  |  |  |  |
Vested |  |  | (28,616 | ) |  |  | 359.45 |  |  |  |  |  |  |  |  |
Cancelled |  |  | (1,611 | ) |  |  | 450.83 |  |  |  |  |  |  |  |
Nonvested, December 31, 2020 |  |  | 40,702 |  |  | $ | 518.13 |  |  |  | 2.38 |  |  | $ | 22,474,033 |
Valuation Assumptions |  | The fair value of Class A-3 and B-Units granted were estimated on their respective grant dates using the Black-Scholes-Merton option pricing model and the following assumptions for the years ended December 31, 2020, 2019 and 2018:
| ​ | ​ | 2018 | ​ | ​ | 2019 | ​ | ​ | 2020
Volatility | ​ | ​ | 70% | ​ | ​ | 70% | ​ | ​ | 50% - 70%
Risk - free interest rate | ​ | ​ | 2.65% - 2.90% | ​ | ​ | 1.68% - 2.49% | ​ | ​ | 0.21% - 0.29%
Dividend yield | ​ | ​ | 0.00% | ​ | ​ | 0.00% | ​ | ​ | 0.00%
Expected life of option (in years) | ​ | ​ | 4 years | ​ | ​ | 4 years | ​ | ​ | 4 years
Weighted - average fair value of common stock | ​ | ​ | $305.35 | ​ | ​ | $531.80 | ​ | ​ | $724.28

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