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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	6 Months Ended
	Jun. 30, 2019
Number of Shares
Options outstanding (in shares)	15,810
Options, Granted (in shares)	3,683
Options, Exercised (in shares)	(1,139)
Options, Forfeited (in shares)	(445)
Options, Expired (in shares)	(60)
Options outstanding (in shares)	17,849
Options, Vested and unvested expected to vest (in shares)	16,975
Options, Exercisable (in shares)	10,624
Weighted Average Exercise Price
Option outstanding (in dollars per share)	$ 8.63
Options, Granted (in dollars per share)	10.36
Options, Exercised (in dollars per share)	5.93
Options, Forfeited (in dollars per share)	11.02
Options, Expired (in dollars per share)	13.61
Option outstanding (in dollars per share)	9.09
Options, Vested and unvested expected to vest (in dollars per share)	8.99
Options, Exercisable (in dollars per share)	$ 8.14
Additional Disclosures
Weighted average remaining contractual life, options outstanding	6 years 9 months 18 days
Weighted average remaining contractual life, options vested and unvested expected to vest	6 years 8 months 12 days
Weighted average remaining contractual life, options exercisable	5 years 6 months
Aggregate intrinsic value, options outstanding	$ 68.7
Aggregate intrinsic value, vested and unvested expected to vest	66.8
Aggregate intrinsic value, exercisable	$ 50.1

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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