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Stock-based Compensation (Q3) (Tables) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Share-based Payment Arrangement [Abstract] |  |
Schedule of Class P 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 |
Schedule of Restricted Stock Units Activity | A summary of the restricted stock unit (“RSU”) activity for the nine months ended September 30, 2021 is as follows:
|  | Number of RSUs |  |  | Weighted-average Grant Date Fair Value |
Non-vested at December 31, 2020 |  |  | — |  |  | $ | — |
Granted |  |  | 4,112,855 |  |  | $ | 13.66 |
Vested |  |  | (242,600 | ) |  | $ | 13.70 |
Forfeited |  |  | (11,310 | ) |  | $ | 13.70 |
Non-vested at September 30, 2021 |  |  | 3,858,945 |  |  | $ | 13.66 |
Schedule of Stock-based Payment Arrangement | The Company recorded stock-based compensation cost related to the Class P Units and RSUs in the following expense categories on the accompanying condensed consolidated statements of income (in thousands):
|  | Three Months Ended September 30, 2021 |  |  | Nine Months Ended September 30, 2021 |
Sales and marketing |  | $ | 689 |  |  | $ | 4,515 |
Product development |  |  | 1,865 |  |  |  | 3,859 |
General and administrative |  |  | 1,638 |  |  |  | 15,251 |
Total stock-based compensation expense |  |  | 4,192 |  |  |  | 23,625 |
Amount capitalized to software development |  |  | 695 |  |  |  | 695 |
Total stock-based compensation cost |  | $ | 4,887 |  |  | $ | 24,320 |

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