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Stock-based Compensation - Stock-Based Compensation Costs (Q3) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2021 | Sep. 30, 2021 | Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation expense | $ 4,192 | $ 23,600 | $ 23,625 |
Stock-based compensation capitalized for software development | 695 |  | 695 | $ 0
Total stock-based compensation cost | 4,887 |  | 24,320 |
Sales and marketing |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation expense | 689 |  | 4,515 |
Product development |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation expense | 1,865 |  | 3,859 |
General and administrative |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation expense | $ 1,638 |  | $ 15,251 |

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