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Stock-based Compensation - Restricted Stock Units Activity (Q3) (Details) - Restricted stock units
9 Months Ended
Sep. 30, 2021
$ / shares
shares
Number of RSUs  
Beginning balance (in shares) | shares 0
Granted (in shares) | shares 4,112,855
Vested (in shares) | shares (242,600)
Forfeited (in shares) | shares (11,310)
Ending balance (in shares) | shares 3,858,945
Weighted-average Grant Date Fair Value  
Beginning balance (in dollars per share) | $ / shares $ 0
Granted (in dollars per share) | $ / shares 13.66
Vested (in dollars per share) | $ / shares 13.70
Forfeited (in dollars per share) | $ / shares 13.70
Ending balance (in dollars per share) | $ / shares $ 13.66