Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation (Narrative) (Details)

v2.4.0.8
Stock-Based Compensation (Narrative) (Details) (USD $)
3 Months Ended 6 Months Ended 1 Months Ended 6 Months Ended 6 Months Ended
Jun. 30, 2014
plan
Jun. 30, 2013
Jun. 30, 2014
plan
Jun. 30, 2013
Mar. 31, 2014
Unvested Restricted Stock
Feb. 28, 2014
Unvested Restricted Stock
Jun. 30, 2014
Unvested Restricted Stock
Jun. 30, 2014
Stock Incentive 1996 Plan
Jun. 30, 2014
The 2002 Plan
Jun. 30, 2014
The 1996 Plan and the 2002 Plan
Jun. 30, 2014
The 1996 Plan and the 2002 Plan
Minimum
Jun. 30, 2014
The 1996 Plan and the 2002 Plan
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Number of stock based compensation plans 2   2                  
Total number of shares authorized               1,500,000.0 12,000,000      
Stock based compensation, granted stock options' vesting period                     1 year 4 years
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    
Stock compensation expense $ 866,732 $ 679,265 $ 1,559,935 $ 1,422,125                
Shares of restricted stock vested         100,000 49,000 149,000          
Aggregate fair value of restricted stock vested         205,000 96,000            
Instruments Other than Options, Forfeited in Period             175,000          
Unrecognized compensation cost related to unvested stock-based awards $ 2,100,000   $ 2,100,000                  
Weighted average recognition period     2 years 0 months 23 days