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 50

-Paragraph 1

-Subparagraph (b)

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

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-Subparagraph (SAB TOPIC 14.F)

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-Name Accounting Standards Codification

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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

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

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

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Stock-Based Compensation (Details 2) (USD $) In Thousands, unless otherwise specified	1 Months Ended	3 Months Ended	12 Months Ended
	May 31, 2014	Mar. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Stock-based compensation
Stock-based compensation expense			$ 27,390	$ 25,687	$ 23,783
Total unrecognized compensation cost related to unvested stock-based compensation			10,787
Stock options
Stock-based compensation
Stock-based compensation expense			4,658	4,132	3,417
Total unrecognized compensation cost related to unvested stock-based compensation			3,207
Weighted-average remaining service period of recognition of unrecognized compensation cost			3 years 2 months 12 days
RSUs
Stock-based compensation
Stock-based compensation expense			4,564	10,174	10,803
Total unrecognized compensation cost related to unvested stock-based compensation			1,814
Weighted-average remaining service period of recognition of unrecognized compensation cost			1 year 4 months 24 days
RSUs \| Performance-contingent
Stock-based compensation
Stock-based compensation expense			3	61	743
RSAs
Stock-based compensation
Stock-based compensation expense			7,575	9,723	7,602
Total unrecognized compensation cost related to unvested stock-based compensation			5,147
Weighted-average remaining service period of recognition of unrecognized compensation cost			3 years 4 months 24 days
RSAs \| Performance-contingent
Stock-based compensation
Stock-based compensation expense	7,000	6,800	10,580	1,061	366
Total unrecognized compensation cost related to unvested stock-based compensation			619
Weighted-average remaining service period of recognition of unrecognized compensation cost			1 year 10 months 24 days
Employee Stock Purchase Plan
Stock-based compensation
Stock-based compensation expense			10	536	852
Continuing operations
Stock-based compensation
Stock-based compensation expense			15,761	7,898	7,785
Discontinued operation
Stock-based compensation
Stock-based compensation expense			11,629	17,789	15,998
Research and development
Stock-based compensation
Stock-based compensation expense			2,781	573	475
General and administrative
Stock-based compensation
Stock-based compensation expense			$ 12,980	$ 7,325	$ 7,310