Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 14.F)

-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809

Reference 2: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 1

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

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-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section F

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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.

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- Definition

Unrecognized cost of unvested options awarded to employees as compensation.

+ References

No definition available.

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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.

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- Definition

Number of equity instruments other than options outstanding, including both vested and non-vested instruments.

+ 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)(i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

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-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

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

+ References

No definition available.

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- Definition

Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

+ References

No definition available.

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Stock Option and Compensation Plans (Details 3) - USD ($) $ / shares in Units, $ in Thousands			12 Months Ended
	Oct. 03, 2014	Sep. 30, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Stock Option and Compensation Plans
Share-based compensation expense			$ 13,040	$ 2,871	$ 640
Stock options
Stock Option and Compensation Plans
Share-based compensation expense			11,300	2,200	500
Unrecognized share-based compensation costs for option awards, net of estimated forfeitures			$ 37,800
Expected weighted average period to recognize share-based compensation costs			3 years 1 month 6 days
Non-employee Options \| Consultants
Stock Option and Compensation Plans
Share-based compensation expense			$ 1,400	$ 700	$ 100
Unrecognized share-based compensation costs for option awards, net of estimated forfeitures			$ 4,100
Expected weighted average period to recognize share-based compensation costs			2 years 10 months 24 days
Unvested restricted stock
Stock Option and Compensation Plans
Units outstanding			37,000
Unvested restricted stock \| Employees
Stock Option and Compensation Plans
Share-based compensation expense			$ 300
Unrecognized share-based compensation costs for option awards, net of estimated forfeitures			$ 900
Expected weighted average period to recognize share-based compensation costs			2 years 4 months 24 days
Options outstanding
Stock Option and Compensation Plans
Granted (in shares)			1,744,000	1,583,000	250,000
Granted (in dollars per share)			$ 33.92	$ 14.82	$ 3.12
Options outstanding \| New Executive
Stock Option and Compensation Plans
Granted (in shares)	150,000	200,000
Granted (in dollars per share)	$ 38.41	$ 38.93