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Stock-Based Awards - Summary of Stock Option Plans Activity (Details) - Stock Option
$ / shares in Units, $ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2020
USD ($)
$ / shares
shares
Dec. 31, 2019
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Number of Options,Outstanding, Beginning Balance | shares 7,186,298  
Number of Options,Granted | shares 4,175,235  
Number of Options,Exercised | shares (1,387,629)  
Number of Options,Forfeited | shares (514,889)  
Number of Options,Outstanding, Ending Balance | shares 9,459,015 7,186,298
Number of Options,Vested and expected to vest | shares 9,459,015  
Number of Options,Vested and exercisable | shares 2,194,929  
Weighted Average Exercise Price, Beginning Balance | $ / shares $ 5.25  
Weighted Average Exercise Price, Granted | $ / shares 32.53  
Weighted Average Exercise Price, Exercised | $ / shares 2.55  
Weighted Average Exercise Price, Forfeited | $ / shares 13.78  
Weighted Average Exercise Price, Ending Balance | $ / shares 17.22 $ 5.25
Weighted Average Exercise Price,Vested and expected to vest | $ / shares 17.22  
Weighted Average Exercise Price,Vested and exercisable | $ / shares $ 4.52  
Weighted Average Remaining Contractual Term 8 years 8 months 12 days 8 years 6 months
Weighted Average Remaining Contractual Term,Vested and expected to vest 8 years 8 months 12 days  
Weighted Average Remaining Contractual Term,Vested and exercisable 7 years 9 months 18 days  
Aggregate Intrinsic Value, Balance | $ $ 174,230  
Aggregate Intrinsic Value, Vested and expected to vest | $ 174,230  
Aggregate Intrinsic Value, Vested and exercisable | $ $ 65,422