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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