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Stock-Based Compensation - Summary of Stock Option Activity (Details) - Stock Option
$ / shares in Units, $ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2020
USD ($)
$ / shares
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Number of Awards    
Outstanding beginning balance, Number of Awards | shares 5,681,422  
Granted, Number of Awards | shares 1,207,300  
Exercised, Number of Awards | shares (106,683)  
Cancelled/Forfeited, Number of Awards | shares (104,070)  
Outstanding ending balance, Number of Awards | shares 6,677,969 5,681,422
Exercisable, Number of Awards | shares 2,786,298  
Vested and expected to vest, Number of Awards | shares 6,677,969  
Weighted Average Exercise Price    
Outstanding beginning balance, Weighted Average Exercise Price | $ / shares $ 3.60  
Granted, Weighted Average Exercise Price | $ / shares 16.61  
Exercised, Weighted Average Exercise Price | $ / shares 1.29  
Cancelled/Forfeited, Weighted Average Exercise Price | $ / shares 3.08  
Outstanding ending balance, Weighted Average Exercise Price | $ / shares 6.02 $ 3.60
Exercisable, Weighted Average Exercise Price | $ / shares 2.65  
Vested and expected to vest, Weighted Average Exercise Price | $ / shares $ 6.02  
Weighted Average Remaining Contractual Life (Years)    
Outstanding, Weighted-Average Remaining Contractual Life (Years) 8 years 2 months 12 days 8 years 7 months 6 days
Exercisable, Weighted-Average Remaining Contractual Life (Years) 7 years 9 months 18 days  
Vested and expected to vest, Weighted-Average Remaining Contractual Life (Years) 8 years 2 months 12 days  
Aggregate Intrinsic Value    
Outstanding, Aggregate Intrinsic Value | $ $ 36,096 $ 69,219
Exercisable, Aggregate Intrinsic Value | $ 21,136  
Vested and expected to vest, Aggregate Intrinsic Value | $ $ 36,096