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Share based Compensation - Stock Option Activity (Details) - Options to purchase common stock
$ / shares in Units, shares in Thousands, $ in Millions
 3 Months Ended
Mar. 31, 2019
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]  
Options outstanding, December 31, 2018 (in shares) | shares 15,810
Options, Granted (in shares) | shares 3,315
Options, Exercised (in shares) | shares (578)
Options, Forfeited (in shares) | shares (195)
Options, Expired (in shares) | shares (21)
Options outstanding, March 31, 2019 (in shares) | shares 18,331
Options, Vested and unvested expected to vest, March 31, 2019 (in shares) | shares 17,325
Options, Exercisable at March 31, 2019 (in shares) | shares 10,538
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]  
Option outstanding, December 31, 2018 (in dollars per share) | $ / shares $ 8.63
Options, Granted (in dollars per share) | $ / shares 10.15
Options, Exercised (in dollars per share) | $ / shares 6.83
Options, Forfeited (in dollars per share) | $ / shares 10.33
Options, Expired (in dollars per share) | $ / shares 10.77
Option outstanding, March 31, 2019 (in dollars per share) | $ / shares 8.94
Options, Vested and unvested expected to vest, March 31, 2019 (in dollars per share) | $ / shares 8.84
Options, Exercisable at March 31, 2019 (in dollars per share) | $ / shares $ 7.84
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]  
Weighted average remaining contractual life, options outstanding, March 31, 2019 6 years 11 months
Weighted average remaining contractual life, options vested and unvested expected to vest, March 31, 2019 6 years 9 months
Weighted average remaining contractual life, options exercisable at March 31, 2019 5 years 6 months
Aggregate intrinsic value, options outstanding, March 31, 2019 | $ $ 90.2
Aggregate intrinsic value, vested and unvested expected to vest, March 31, 2019 | $ 87.1
Aggregate intrinsic value, exercisable at March 31, 2019 | $ $ 62.8