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Stock-based Compensation - Stock Options Activity (Details) - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Dec. 31, 2018
Number of Options      
Outstanding (shares) 4,048,802 2,169,000  
Granted (shares) 968,280 2,255,800  
Exercised (shares) (92,157) (182,057)  
Cancelled (shares) (110,001) (193,941)  
Outstanding (shares) 4,814,924 4,048,802 2,169,000
Exercisable (shares) 1,698,568 987,985  
Vested and expected to vest, (shares) 4,814,924 3,110,817  
Weighted- Average Exercise Price      
Outstanding (usd per share) $ 13.27 $ 3.62  
Granted (usd per share) 30.44 21.17  
Exercised (usd per share) 3.77 1.73  
Cancelled (usd per share) 20.87 7.99  
Outstanding (usd per share) 16.73 13.27 $ 3.62
Exercisable, weighted-average exercise price (usd per share) 8.72 4.00  
Vested and expected to vest, weighted-average exercise price (usd per share) $ 16.73 $ 16.39  
WeightedAverage Remaining Contractual Term and Aggregate Intrinsic Value      
Outstanding, weighted-average remaining contractual, term 8 years 4 months 24 days 8 years 9 months 29 days 8 years 9 months
Granted, weighted-average remaining contractual, term   9 years 4 months 24 days  
Exercisable, weighted-average remaining contractual, term 7 years 6 months 7 years 6 months 7 days  
Vested and expected to vest, weighted-average remaining contractual, term 8 years 4 months 24 days 9 years 3 months  
Outstanding, aggregate intrinsic value, outstanding $ 158.8 $ 42,200,000 $ 17,300,000
Exercisable, aggregate intrinsic value 69.6 19,500,000  
Vested and expected to vest, aggregate intrinsic value $ 158.8 $ 22,700,000