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Stockholders' Equity (Deficit) - Summary of Stock Equity Award Activity (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Share-based Payment Arrangement [Abstract] |  |  |  |
Shares Available for Grant, Beginning Balance |  | 4,722,481 | 1,232,874 | 5,645,652
Shares Available for Grant, Increase in authorized shares |  | 48,412,876 | 17,927,565 | 23,873,281
Shares Available for Grant, Stock options granted |  | (17,232,871) | (22,829,471) | (32,867,335)
Shares Available for Grant, Stock options forfeited or expired |  | 3,789,301 | 8,337,091 | 4,413,648
Shares Available for Grant, Repurchases of unvested common stock |  | 188,460 | 54,422 | 167,628
Shares Available for Grant, RSUs granted |  | (7,215,043) |  |
Shares Available for Grant, RSUs Forfeited or Cancelled |  | 132,041 |  |
Shares Available for Grant, Ending Balance | 5,645,652 | 32,797,245 | 4,722,481 | 1,232,874
Outstanding Stock Options, Beginning Balance |  | 71,213,150 | 67,586,556 | 48,361,074
Outstanding Stock Options, Stock options granted |  | 17,232,871 | 22,829,471 | 32,867,335
Outstanding Stock Options, Stock options exercised |  | (22,730,337) | (10,865,786) | (9,228,205)
Outstanding Stock Options, Stock options forfeited or expired |  | (3,789,301) | (8,337,091) | (4,413,648)
Outstanding Stock Options, Ending Balance | 48,361,074 | 61,926,383 | 71,213,150 | 67,586,556
Outstanding Stock Options, Vested |  | 22,294,417 |  |
Outstanding Stock Options, Vested and expected to vest |  | 61,926,383 |  |
Weighted-Average Exercise Price, Beginning Balance |  | $ 3.39 | $ 2.06 | $ 1.12
Weighted-Average Exercise Price, Stock options granted |  | 16.38 | 6.20 | 3.24
Weighted-Average Exercise Price, Stock options exercised |  | 3.13 | 1.58 | 1.47
Weighted-Average Exercise Price, Stock options forfeited |  | 5.31 | 2.65 | 1.78
Weighted-Average Exercise Price, Ending Balance | $ 1.12 | 6.97 | $ 3.39 | $ 2.06
Weighted-Average Exercise Price, Vested |  | 3.25 |  |
Weighted-Average Exercise Price, Vested and Expected to Vest |  | $ 6.97 |  |
Weighted-Average Remaining Contractual Term (in years) | 8 years 8 months 15 days | 7 years 10 months 17 days | 8 years 3 months 3 days | 8 years 6 months 14 days
Weighted-Average Remaining Contractual Term Vested (in years) |  | 6 years 10 months 17 days |  |
Weighted-Average Remaining Contractual Term Vested and expected to vest (in years) |  | 7 years 10 months 17 days |  |
Aggregate Intrinsic Value, Beginning Balance |  | $ 677,503 | $ 202,315 | $ 98,241
Aggregate Intrinsic Value, Ending Balance | $ 98,241 | 4,289,643 | $ 677,503 | $ 202,315
Aggregate Intrinsic Value, Vested as of September 30, 2021 |  | 1,627,213 |  |
Aggregate Intrinsic Value, Vested and expected to vest as of September 30, 2021 |  | $ 4,289,643 |  |

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