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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