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Equity Incentive Plans - Activity of Stock Options for the Period (Details) - $ / shares
9 Months Ended
Sep. 30, 2021
Options Outstanding  
Beginning balance (in shares) 9,551,105
Options granted (in shares) 1,384,227
Options exercised (in shares) (760,383)
Options cancelled and forfeited (in shares) (276,880)
Ending balance (in shares) 9,898,069
Vested and exercisable (in shares) 2,600,982
Weighted Average Exercise Price  
Beginning balance (in dollars per share) $ 5.55
Options granted (in usd per share) 50.57
Options exercised (in usd per share) 1.37
Options cancelled and forfeited (in usd per share) 17.08
Ending balance (in dollars per share) 11.84
Vested and exercisable (in usd per share) $ 3.63