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Stock-Based Compensation - Options by exercise price (Details) | 12 Months Ended
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Dec. 31, 2018 $ / shares shares
Stock options outstanding and exercisable by exercise price |
Stock Options Outstanding, Number of Shares | shares | 5,966,928
Stock Options Outstanding, Remaining Contractual Term | 7 years 6 months 4 days
Stock Options Outstanding, Weighted-Average Exercise Price (in dollars per share) | $ 19.71
Stock Options Exercisable, Number of Shares | shares | 3,058,659
Stock Options Exercisable, Weighted-Average Exercise Price (in dollars per share) | $ 15.12
$0.59 - $4.25 |
Stock options outstanding and exercisable by exercise price |
Range of Exercise Prices, lower limit (in dollars per share) | 0.59
Range of Exercise Prices, upper limit (in dollars per share) | $ 4.25
Stock Options Outstanding, Number of Shares | shares | 291,433
Stock Options Outstanding, Remaining Contractual Term | 4 years 5 months 27 days
Stock Options Outstanding, Weighted-Average Exercise Price (in dollars per share) | $ 3.63
Stock Options Exercisable, Number of Shares | shares | 291,433
Stock Options Exercisable, Weighted-Average Exercise Price (in dollars per share) | $ 3.63
$9.78 - $14.75 |
Stock options outstanding and exercisable by exercise price |
Range of Exercise Prices, lower limit (in dollars per share) | 9.78
Range of Exercise Prices, upper limit (in dollars per share) | $ 14.75
Stock Options Outstanding, Number of Shares | shares | 1,560,249
Stock Options Outstanding, Remaining Contractual Term | 6 years 4 months 21 days
Stock Options Outstanding, Weighted-Average Exercise Price (in dollars per share) | $ 12.10
Stock Options Exercisable, Number of Shares | shares | 1,281,242
Stock Options Exercisable, Weighted-Average Exercise Price (in dollars per share) | $ 11.97
$14.77 – $22.18 |
Stock options outstanding and exercisable by exercise price |
Range of Exercise Prices, lower limit (in dollars per share) | 14.77
Range of Exercise Prices, upper limit (in dollars per share) | $ 22.18
Stock Options Outstanding, Number of Shares | shares | 852,138
Stock Options Outstanding, Remaining Contractual Term | 6 years 7 months 13 days
Stock Options Outstanding, Weighted-Average Exercise Price (in dollars per share) | $ 17.00
Stock Options Exercisable, Number of Shares | shares | 706,562
Stock Options Exercisable, Weighted-Average Exercise Price (in dollars per share) | $ 16.35
$22.20 – $33.78 |
Stock options outstanding and exercisable by exercise price |
Range of Exercise Prices, lower limit (in dollars per share) | 22.20
Range of Exercise Prices, upper limit (in dollars per share) | $ 33.78
Stock Options Outstanding, Number of Shares | shares | 2,929,571
Stock Options Outstanding, Remaining Contractual Term | 8 years 5 months 1 day
Stock Options Outstanding, Weighted-Average Exercise Price (in dollars per share) | $ 23.92
Stock Options Exercisable, Number of Shares | shares | 760,672
Stock Options Exercisable, Weighted-Average Exercise Price (in dollars per share) | $ 23.08
$34.56 – $43.16 |
Stock options outstanding and exercisable by exercise price |
Range of Exercise Prices, lower limit (in dollars per share) | 34.56
Range of Exercise Prices, upper limit (in dollars per share) | $ 43.16
Stock Options Outstanding, Number of Shares | shares | 333,537
Stock Options Outstanding, Remaining Contractual Term | 9 years 8 months 5 days
Stock Options Outstanding, Weighted-Average Exercise Price (in dollars per share) | $ 39.26
Stock Options Exercisable, Number of Shares | shares | 18,750
Stock Options Exercisable, Weighted-Average Exercise Price (in dollars per share) | $ 38.93

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- Definition The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(iii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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