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Share-Based Compensation - Stock Option Activity (Details) - Options to purchase common stock - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
9 Months Ended
Sep. 30, 2019
Number of Shares  
Options outstanding (in shares) 15,810
Options, Granted (in shares) 3,913
Options, Exercised (in shares) (1,353)
Options, Forfeited (in shares) (701)
Options, Expired (in shares) (139)
Options outstanding (in shares) 17,530
Options, Vested and unvested expected to vest (in shares) 16,792
Options, Exercisable (in shares) 10,896
Weighted Average Exercise Price  
Option outstanding (in dollars per share) $ 8.63
Options, Granted (in dollars per share) 10.37
Options, Exercised (in dollars per share) 5.77
Options, Forfeited (in dollars per share) 11.05
Options, Expired (in dollars per share) 14.00
Option outstanding (in dollars per share) 9.10
Options, Vested and unvested expected to vest (in dollars per share) 9.02
Options, Exercisable (in dollars per share) $ 8.22
Additional Disclosures  
Weighted average remaining contractual life, options outstanding 6 years 6 months
Weighted average remaining contractual life, options vested and unvested expected to vest 6 years 4 months 24 days
Weighted average remaining contractual life, options exercisable 5 years 2 months 12 days
Aggregate intrinsic value, options outstanding $ 19.5
Aggregate intrinsic value, vested and unvested expected to vest 19.4
Aggregate intrinsic value, exercisable $ 16.9