Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation (Details)

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Stock-Based Compensation (Details) (USD $)
Share data in Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Number of Shares        
Number of stock based compensation plans in which instruments are outstanding 2   2  
Stock compensation expense $ 588,000 $ 1,800,000 $ 1,722,127 $ 3,073,074
Unrecognized compensation cost related to unvested stock-based awards 2,300,000   2,300,000  
Unrecognized compensation cost related to unvested stock-based awards, weighted average recognition period 1 year 10 months 24 days   1 year 10 months 24 days  
The 1996 Plan [Member]
       
Number of Shares        
Stock based compensation, outstanding stock options' expiration period     10 years  
Stock based compensation, outstanding stock options' expiration period upon optionee's separation from employment     90 days  
Total number of shares authorized 1.5   1.5  
The 1996 Plan [Member] | Minimum [Member]
       
Number of Shares        
Stock based compensation, granted stock options' vesting period     1 year  
The 1996 Plan [Member] | Maximum [Member]
       
Number of Shares        
Stock based compensation, granted stock options' vesting period     4 years  
The 2002 Plan [Member]
       
Number of Shares        
Stock based compensation, outstanding stock options' expiration period     10 years  
Stock based compensation, outstanding stock options' expiration period upon optionee's separation from employment     90 days  
Total number of shares authorized 12.0   12.0  
The 2002 Plan [Member] | Minimum [Member]
       
Number of Shares        
Stock based compensation, granted stock options' vesting period     1 year  
The 2002 Plan [Member] | Maximum [Member]
       
Number of Shares        
Stock based compensation, granted stock options' vesting period     4 years  
Former President and CEO, David C. Bupp [Member]
       
Number of Shares        
Stock compensation expense       $ 1,500,000