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Share-Based Compensation - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Shares      
Beginning balance (in shares) 56,966,000    
Granted (in shares) 1,130,000 0  
Exercised (in shares) (28,855,000)    
Ending balance (in shares) 29,241,000    
Exercisable (in shares) 28,322,000    
Weighted-Average Exercise Price      
Beginning balance (in dollars per share) $ 2.25    
Granted (in dollars per share) 22.35    
Exercised (in dollars per share) 2.25    
Ending balance (in dollars per share) 3.03    
Exercisable (in dollars per share) $ 2.41    
Weighted-Average Remaining Contractual Term, Outstanding 3 years 1 month 6 days 3 years 6 months  
Weighted-Average Remaining Contractual Term, Exercisable 2 years 10 months 24 days    
Aggregate Intrinsic Value, Outstanding $ 1,124,964   $ 933,299
Aggregate Intrinsic Value, Exercisable $ 1,107,358