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Equity Incentive Plans and Stock-Based Compensation (Details)	1 Months Ended	12 Months Ended
	Apr. 30, 2009	Dec. 31, 2012 denominator numerator	Mar. 31, 2006
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Tenure of award (in years)		10 years
Numerator in conversion factor used to determine shares available for grant		1.5
Denominator in conversion factor used to determine shares available for grant		1
Increase in shares approved for issuance	6,500,000
Number of shares reserved for issuance under the 2006 stock option plan		21,400,000	8,400,000
Option One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Requisite service period (in months)		60 months
Option Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Requisite service period (in months)		48 months

X

- Definition

The additional 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

No definition available.

+ Details

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X

- Definition

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

+ References

No definition available.

+ Details

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X

- Definition

Represents the denominator in the conversion factor used to determine the change in remaining shares available for grant.

+ References

No definition available.

+ Details

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X

- Definition

Represents the numerator in the conversion factor used to determine the change in remaining shares available for grant.

+ References

No definition available.

+ Details

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X

- Definition

Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, 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=6415400&loc=d3e5070-113901

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X

- 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 Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph a

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: 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=6415400&loc=d3e5070-113901

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