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Equity Incentive Plans - Summary of Stock Option Activity Under 2009 Plan and 2019 Plan (Details) $ / shares in Units, $ in Thousands | 9 Months Ended |
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Sep. 30, 2021 USD ($) $ / shares shares | Dec. 31, 2020 USD ($)
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |  |
Shares Subject to Outstanding Options, Options outstanding, Beginning Balance | shares | 14,433,560 |
Shares Subject to Outstanding Options, Options granted | shares | 2,407,629 |
Shares Subject to Outstanding Options, Options forfeited or cancelled | shares | (744,501) |
Shares Subject to Outstanding Options, Options expired | shares | (21,452) |
Shares Subject to Outstanding Options, Options exercised | shares | (3,310,804) |
Shares Subject to Outstanding Options, Options outstanding, Ending Balance | shares | 12,764,432 |
Shares Subject to Outstanding Options, Options vested and exercisable | shares | 7,080,906 |
Weighted Average Exercise Price per Share, Options outstanding, Beginning Balance | $ / shares | $ 12.82 |
Weighted Average Exercise Price per Share, Options granted | $ / shares | 41.21 |
Weighted Average Exercise Price per Share, Options forfeited or cancelled | $ / shares | 24.48 |
Weighted Average Exercise Price per Share, Options expired | $ / shares | 18.98 |
Weighted Average Exercise Price per Share, Options exercised | $ / shares | 7.04 |
Weighted Average Exercise Price per Share, Options outstanding, Ending Balance | $ / shares | 18.98 |
Weighted Average Exercise Price per Share, Options vested and exercisable | $ / shares | $ 10.29 |
Aggregate Intrinsic Value, Option outstanding | $ | $ 218,168 | $ 668,458
Aggregate Intrinsic Value, Options vested and exercisable | $ | $ 170,535 |

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