Share-based Compensation - Employee Stock Purchase Plan (Details)	0 Months Ended	12 Months Ended
Dec. 19, 2012	Dec. 31, 2012
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Vesting period		3 years
Employee Stock Purchase Plan [Member]
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Shares of common stock reserved for future issuance		800,000
Shares of common stock available for issuance		39,296
Percent of market value purchase price		85.00%
Employee maximum witholding percentage		15.00%
Additional shares authorized awaiting approval	400,000
Share-based Compensation, Past Plans [Member]
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Shares of common stock reserved for future issuance		10,075,000
Shares of common stock available for issuance		1,195,419
Minimum [Member] \| Share-based Compensation, Past Plans [Member]
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Vesting period		4 years
Maximum [Member] \| Share-based Compensation, Past Plans [Member]
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Vesting period		5 years

Employee Stock Ownership Plan, Company Compensation Withholding for Purchase of Shares

No definition available.

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- Definition

Share-based compensation arrangement by share-based payment award, percent of market value

+ References

No definition available.

+ Details

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- Details

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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=6415400&loc=d3e5070-113901

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- Definition

Number of additional shares authorized for issuance under an established share-based compensation plan.

+ References

No definition available.

+ Details

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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 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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- 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

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=6415400&loc=d3e5070-113901

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