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Stockholders' Equity and Stock-Based Compensation-Stock Option Activity (Q3) (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
9 Months Ended
Sep. 30, 2021
USD ($)
$ / shares
shares
Number of Shares  
Options outstanding, beginning of period (in shares) | shares 16,170
Granted (in shares) | shares 8,511
Exercised (in shares) | shares (3,717)
Forfeited (in shares) | shares (617)
Options outstanding, end of period (in shares) | shares 20,347
Vested and expected (in shares) | shares 17,900
Exercisable (in shares) | shares 8,022
Weighted-Average Exercise Price  
Outstanding, beginning of period (in dollars per share) | $ / shares $ 2.69
Granted (in USD per share) | $ / shares 16.56
Exercised (in USD per share) | $ / shares 1.50
Forfeited (in USD per share) | $ / shares 10.92
Outstanding, beginning of period (in dollars per share) | $ / shares 8.46
Vested and expected to vest at June 30, 2021 (in USD per share) | $ / shares 7.67
Exercisable (in USD per share) | $ / shares $ 4.71
Weighted-Average Remaining Contractual Life (in Years)  
Outstanding at June 30, 2021 (in years) 8 years
Vested and expected to vest at June 30, 2021 (in years) 7 years 9 months 18 days
Exercisable at June 30, 2021 (in years) 6 years 7 months 6 days
Aggregate Intrinsic Value  
Outstanding at September 30, 2021 | $ $ 94,017
Vested and expected to vest at September 30, 2021 | $ 91,212
Exercisable at September 30, 2021 | $ $ 55,794