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.

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=6415400&loc=d3e5070-113901

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- Definition

Unrecognized cost of unvested options awarded to employees as compensation.

+ References

No definition available.

+ Details

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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 share options (or share units) granted during the period.

+ 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=6415400&loc=d3e5070-113901

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- Details

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- Details

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Stockholders' Equity (Details 7) - USD ($)	6 Months Ended
Stockholders' Equity (Details 7) - USD ($)	Jun. 30, 2016	Jun. 30, 2015
Equity Incentive Plans
Unrecognized compensation cost	$ 48,000,000
Stock Options
Equity Incentive Plans
Unrecognized compensation cost		$ 0
Granted (in shares)	1,592,552
Stock Options \| June 2016 Award Date
Equity Incentive Plans
Unrecognized compensation cost	$ 44,900,000
Non-Employee Stock Option \| Non-employee directors \| June 2015 Award Date
Equity Incentive Plans
Unrecognized compensation cost		$ 9,300,000
Stock Options And Restricted Stock Units \| June 2016 Award Date
Equity Incentive Plans
Recognition of share-based compensation expense (in years)	3 years 6 months
Stock Options And Restricted Stock Units \| Non-employee directors \| June 2016 Award Date
Equity Incentive Plans
Unrecognized compensation cost	$ 3,100,000
Stock Incentive Plan 2015 (The 2015 Plan) \| Stock Options
Equity Incentive Plans
Granted (in shares)	1,600,000	0