Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation (Details)

v2.4.0.6
Stock-Based Compensation (Details) (USD $)
3 Months Ended 1 Months Ended 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2013
Restricted Stock [Member]
Feb. 28, 2013
Restricted Stock [Member]
Mar. 31, 2013
Restricted Stock [Member]
Mar. 31, 2013
The 1996 Plan [Member]
Mar. 31, 2013
The 1996 Plan [Member]
Minimum [Member]
Mar. 31, 2013
The 1996 Plan [Member]
Maximum [Member]
Mar. 31, 2013
The 2002 Plan [Member]
Mar. 31, 2013
The 2002 Plan [Member]
Minimum [Member]
Mar. 31, 2013
The 2002 Plan [Member]
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Number of stock based compensation plans in which instruments are outstanding 2                    
Stock based compensation, outstanding stock options' expiration period           10 years     10 years    
Stock based compensation, outstanding stock options' expiration period upon optionee's separation from employment           90 days     90 days    
Stock compensation expense $ 742,860 $ 418,304                  
Unrecognized compensation cost related to unvested stock-based awards 3,900,000                    
Unrecognized compensation cost related to unvested stock-based awards, weighted average recognition period 2 years 2 months 12 days                    
Total number of shares authorized           1,500,000     12,000,000    
Stock based compensation, granted stock options' vesting period             1 year 4 years   1 year 4 years
Shares of restricted stock vested     560,000 100,000 660,000            
Aggregate fair value of restricted stock vested     $ 1,800,000 $ 308,000