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Stock-Based Compensation (Details Textual) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 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    
Options and Other Stock Based Awards 8,800,000   8,800,000    
2008 Equity Incentive Plan [Member]
          
Stock-Based Compensation (Textual) [Abstract]          
Increase in stock-based compensation, common stock authorized         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