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Stock-Based Compensation - Options Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Number of Options    
Outstanding at beginning of period (in shares) 45,536,915  
Granted (in shares) 5,036,520  
Exercised (in shares) (13,888,434)  
Cancelled/forfeited (in shares) (2,627,468)  
Outstanding at end of period (in shares) 34,057,533 45,536,915
Weighted Average Exercise Price per Share    
Outstanding at beginning of period (usd per share) $ 13.82  
Granted (usd per share) 36.04  
Exercised (usd per share) 12.93  
Cancelled/forfeited (usd per share) 18.14  
Outstanding at end of period (usd per share) 17.14 $ 13.82
Weighted Average Grant Date Fair Value per Share    
Outstanding at beginning of period (usd per share) 7.35  
Granted (usd per share) 19.30  
Exercised (usd per share) 6.68  
Cancelled/forfeited (usd per share) 10.56  
Outstanding at end of period (usd per share) $ 9.12 $ 7.35
Outstanding and Exercisable    
Number of Options, Exercisable (in shares) 17,461,374  
Weighted- Average Exercise Price per Share, Exercisable (usd per share) $ 10.99  
Weighted- Average Grant Date Fair Value per Share, Exercisable (usd per share) $ 5.67  
Weighted- Average Remaining Contractual Term, Outstanding 6 years 8 months 12 days 7 years 2 months 12 days
Weighted- Average Remaining Contractual Term, Exercisable 5 years 4 months 24 days  
Aggregate Intrinsic Value, Outstanding $ 2,976,235 $ 286,310
Aggregate Intrinsic Value, Exercisable $ 1,632,365  
Vested and expected to vest    
Number of Options (in shares) 16,596,159  
Weighted- Average Exercise Price per Share (usd per share) $ 23.61  
Weighted- Average Grant Date Fair Value per Share $ 12.75  
Weighted- Average Remaining Contractual Term 8 years 2 months 12 days  
Aggregate Intrinsic Value $ 1,343,870