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Equity Incentive Plans - Summary of Stock Option Activity Under 2009 Plan and 2019 Plan (Details)
$ / shares in Units, $ in Thousands
 6 Months Ended
Jun. 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 1,991,825  
Shares Subject to Outstanding Options, Options forfeited or cancelled | shares (493,858)  
Shares Subject to Outstanding Options, Options expired | shares (19,626)  
Shares Subject to Outstanding Options, Options exercised | shares (2,950,197)  
Shares Subject to Outstanding Options, Options outstanding, Ending Balance | shares 12,961,704  
Shares Subject to Outstanding Options, Options vested and exercisable | shares 6,739,178  
Weighted Average Exercise Price per Share, Options outstanding, Beginning Balance | $ / shares $ 12.82  
Weighted Average Exercise Price per Share, Options granted | $ / shares 43.37  
Weighted Average Exercise Price per Share, Options forfeited or cancelled | $ / shares 21.80  
Weighted Average Exercise Price per Share, Options expired | $ / shares 16.38  
Weighted Average Exercise Price per Share, Options exercised | $ / shares 6.95  
Weighted Average Exercise Price per Share, Options outstanding, Ending Balance | $ / shares 18.50  
Weighted Average Exercise Price per Share, Options vested and exercisable | $ / shares $ 9.25  
Aggregate Intrinsic Value, Option outstanding | $ $ 300,793 $ 668,458
Aggregate Intrinsic Value, Options vested and exercisable | $ $ 213,508