Period used to calculate average closing stock price on grant date (in days).

No definition available.

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- Definition

Represents the exercise period under share-based arrangement.

+ References

No definition available.

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- Definition

Amount of difference between fair values of the underlying shares reserved for issuance and exercise price of options vested during the period.

+ References

No definition available.

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- Definition

Represents the exercise period under share-based arrangement applicable to stockholder owning to more than ten percent of the entity common stock.

+ References

No definition available.

+ Details

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- Definition

Represents the percentage of ownership in the entity common stock required for specified stock options exercise price.

+ References

No definition available.

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- Definition

Represents the exercise price of options as a percentage of grant date fair value of common stock applicable to stockholder owning to more than ten percent of the entity common stock.

+ References

No definition available.

+ Details

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Offering Period

+ References

No definition available.

+ Details

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Maximum Compensation

+ References

No definition available.

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- Definition

Aggregate carrying value as of the balance sheet date of the liabilities for stock option plans and other equity-based compensation arrangements payable within one year (or the operating cycle, if longer).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.20)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Unrecognized cost of unvested share-based compensation awards.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

Net number of non-option equity instruments granted to participants.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

+ References

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- Definition

Gross number of share options (or share units) granted during the period.

+ References

No definition available.

+ Details

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

Number of options outstanding, including both vested and non-vested options.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-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=96867065&loc=d3e5070-113901

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- Definition

Percentage of vesting of share-based compensation awards.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

Purchase price of common stock expressed as a percentage of its fair value.

+ References

No definition available.

+ Details

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Employee Stock Benefit Plans - Narrative (Details) - USD ($)	1 Months Ended		2 Months Ended	6 Months Ended	12 Months Ended
	Apr. 30, 2016	Sep. 30, 2015	May 08, 2016	Nov. 27, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Inducement stock options issued (in shares)			341,450	490,000
Grant date fair value (in dollars per share)					$ 22.74	$ 19.79	$ 30.52
Award expiration period					10 years
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date fair value (in dollars per share)			$ 30.25	$ 27.80
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date fair value (in dollars per share)			$ 33.49	$ 42.97
Stock option / 2011 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares of common stock authorized for issuance (in shares)					9,860,000
Number of shares available for grant (in shares)					2,688,000
Employee stock purchase plan / 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares of common stock authorized for issuance (in shares)					1,290,594
Number of shares available for grant (in shares)					1,214,314
Exercise price of options as percentage of fair value of common stock on the date of grant					85.00%
Award offering period					6 months
Award maximum compensation					25.00%
Deferred compensation liability					$ 1,300,000
Options to purchase common stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding (in shares)					5,648,000	6,374,000
Inducement stock options issued (in shares)					2,094,000
Aggregate intrinsic value of options vested during the period					$ 33,100,000	$ 3,700,000
Options to purchase common stock \| Stock option / 2011 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares of common stock authorized for issuance (in shares)					8,976,000
Exercise price of options as percentage of fair value of common stock on the date of grant					100.00%
Exercise price of options as percentage of fair value of common stock on the date of grant in case of options granted to stockholder owning in excess of 10% of Company's common stock					110.00%
Percentage of ownership required in entity's common stock for specified exercise price					10.00%
Exercise period					10 years
Exercise period in case of stock options granted to stockholder owning in excess of 10% of the company's common stock					5 years
Award vesting period					4 years
Options to purchase common stock \| Stock option / 2003 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares of common stock authorized for issuance (in shares)					884,000
Exercise price of options as percentage of fair value of common stock on the date of grant					100.00%
Exercise price of options as percentage of fair value of common stock on the date of grant in case of options granted to stockholder owning in excess of 10% of Company's common stock					110.00%
Percentage of ownership required in entity's common stock for specified exercise price					10.00%
Exercise period					10 years
Exercise period in case of stock options granted to stockholder owning in excess of 10% of the company's common stock					5 years
Award vesting period					4 years
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation expense					$ 51,100,000
Weighted average period over which unrecognized compensation is expected to be recognized					3 years
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period					4 years
Grant date fair value (in dollars per share)	$ 33.03				$ 38.62
Total unrecognized compensation expense					$ 4,500,000
Weighted average period over which unrecognized compensation is expected to be recognized					3 years
Granted (in shares)	58,500				137,000
Performance units (PSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		1 year
Grant date fair value (in dollars per share)					$ 0	$ 0	$ 49.59
Award expiration period		3 years
Total unrecognized compensation expense					$ 0
Granted (in shares)					0
Performance units awarded to employee (in shares)		25,000
Period used to calculate average closing stock price on grant date		45 days
Tranche one, 25% on year anniversary of employee hire date
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights, percentage					25.00%
Tranche one, 75% the following three years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period					3 years
Award vesting rights, percentage					75.00%