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Stock-Based Compensation - Options Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Number of Options    
Outstanding at beginning of period (in shares) 50,821,132  
Granted (in shares) 7,354,268  
Exercised (in shares) (6,945,306)  
Cancelled/forfeited (in shares) (5,693,179)  
Outstanding at end of period (in shares) 45,536,915 50,821,132
Weighted Average Exercise Price per Share    
Outstanding at beginning of period (usd per share) $ 12.16  
Granted (usd per share) 19.58  
Exercised (usd per share) 6.86  
Cancelled/forfeited (usd per share) 15.17  
Outstanding at end of period (usd per share) 13.82 $ 12.16
Weighted Average Grant Date Fair Value per Share    
Outstanding at beginning of period (usd per share) 6.59  
Granted (usd per share) 11.35  
Exercised (usd per share) 4.47  
Cancelled/forfeited (usd per share) 8.67  
Outstanding at end of period (usd per share) $ 7.35 $ 6.59
Outstanding and Exercisable    
Number of Options, Exercisable (in shares) 22,872,221  
Weighted- Average Exercise Price per Share, Exercisable (usd per share) $ 10.13  
Weighted- Average Grant Date Fair Value per Share, Exercisable (usd per share) $ 4.86  
Weighted- Average Remaining Contractual Term, Outstanding 7 years 2 months 7 years 1 month
Weighted- Average Remaining Contractual Term, Exercisable 5 years 11 months  
Aggregate Intrinsic Value, Outstanding $ 286,310 $ 220,434
Aggregate Intrinsic Value, Exercisable $ 216,241  
Vested and expected to vest    
Number of Options (in shares) 22,664,694  
Weighted- Average Exercise Price per Share (usd per share) $ 17.54  
Weighted- Average Grant Date Fair Value per Share $ 9.86  
Weighted- Average Remaining Contractual Term 8 years 7 months  
Aggregate Intrinsic Value $ 70,069