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Stock-Based Compensation (Details Textual) (USD $) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011 | Jun. 06, 2012
Stock-Based Compensation (Textual) [Abstract] |  |  |  |  |
Aggregate number of shares of common stock reserved for future issuance | 13,000,000 |  | 13,000,000 |  |
Outstanding options and other stock based awards | 8,800,000 |  | 8,800,000 |  |
Restricted stock units vesting Description |  |  | the restricted stock units vest in three annual installments from the date of grant and are generally issuable at the end of the three-year vesting term |  |
2008 Equity Incentive Plan [Member] |  |  |  |  |
Stock-Based Compensation (Textual) [Abstract] |  |  |  |  |
Increase in shares of common stock authorized for issuance |  |  |  |  | 3,000,000
Maximum number of shares of common stock authorized for issuance |  |  |  |  | 13,540,940
Number of shares available for future issuance | 4,200,000 |  | 4,200,000 |  |
Performance-based stock options, outstanding | 100,000 |  | 100,000 |  |
Stock-based compensation associated with performance-based stock options | $ 0 | $ 0 | $ 0 | $ 0 |
Employee Stock Purchase Plan [Member] |  |  |  |  |
Stock-Based Compensation (Textual) [Abstract] |  |  |  |  |
Increase in shares of common stock authorized for issuance |  |  |  |  | 500,000
Maximum number of shares of common stock authorized for issuance |  |  |  |  | 1,320,500
Number of shares available for future issuance | 600,000 |  | 600,000 |  |

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- Definition Stockholder approved to increase the aggregate number of shares of common stock authorized for issuance under an equity incentive plan or employee stock purchase plan. + References No definition available. + Details
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- Definition Outstanding options and other stock-based awards under equity incentive plans other than the employee stock purchase plan + References No definition available. + Details
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- Definition Aggregate number of common shares reserved for future issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Description of award terms as to how many shares or portion of an award are no longer contingent on satisfaction of either a service condition, market condition or a performance condition, thereby giving the employee the legal right to convert the award to shares, to sell the shares, and be entitled to the cash proceeds of such sale. For example, vesting may be expressed as being 25 percent of the shares under option on each anniversary of the grant date. + 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 Reference 2: 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. + Details
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