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Stock-Based Compensation (Details Textual) (USD $)
In Thousands, except Share data, unless otherwise specified
6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Stock-Based Compensation (Textual) [Abstract]      
Stock-based compensation expense $ 2,178    
Share-based compensation 2,178 2,728  
Stock option contractual terms P10Y    
Grant date fair value per share $ 3.37 $ 2.75  
Remaining common stock shares 2,164,000   2,010,000
Share Based Compensation (Additional) (Textual) [Abstract]      
Stock option vesting period 4 years    
Stock option granting period after granted 1 year    
Vesting period after grant date 4 years    
Stock option granted to non employee directors 1 year    
Unrecognized compensation cost 9,912    
Recognized cost current year 2,041    
Recognized cost, 2013 3,709    
Recognized cost, 2014 2,538    
Recognized cost, 2015 1,428    
Recognized cost, 2016 196    
Incentive Plan [Member]
     
Stock-Based Compensation (Textual) [Abstract]      
Stock-based compensation expense 2,108    
Share-based compensation   2,603  
Stock option awards granted in percentage 25.00% 25.00%  
ESPP [Member]
     
Stock-Based Compensation (Textual) [Abstract]      
Stock-based compensation expense 70    
Share-based compensation   88  
Common stock shares reserved 975,000    
Common stock, shares issued 234,000    
Remaining common stock shares 84,000    
Percentage of salary to purchase common stock 15.00%    
Percentage of common stock shares Beginning 85.00%    
Percentage of common stock shares Ending 85.00%    
Purchase of common stock shares 3    
Maximum number of shares per employee amount $ 25    
Inducement grant [Member]
     
Stock-Based Compensation (Textual) [Abstract]      
Share-based compensation   $ 37