Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity and Share-Based Compensation (Details)

v2.4.0.6
Stockholders' Equity and Share-Based Compensation (Details) (USD $)
 6 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Summary of stock option activity    
Options outstanding, Shares, Beginning 5,526,090  
Options Outstanding, Weighted Average Exercise Price, Beginning $ 4.51  
Options Outstanding, Weighted Average Remaining Contractual Term (in years), Beginning 7 years 29 days 6 years 11 months 12 days
Granted - Shares 777,500  
Granted - Weighted Average Exercise Price $ 4.21  
Exercised - Shares (20,000)  
Exercised - Weighted Average Exercise Price $ 2.14  
Expired - Shares (165,000)  
Expired - Weighted Average Exercise Price $ 4.75  
Forfeited - Shares (100,000)  
Forfeited - Weighted Average Exercise Price $ 7.80  
Options outstanding, Shares, Ending 6,018,590 5,526,090
Options Outstanding, Weighted Average Exercise Price, Ending $ 4.42 $ 4.51
Options outstanding, Aggregate Intrinsic Value, Ending $ 4,649,000  
Options Outstanding, Weighted Average Remaining Contractual Term (in years), Ending 7 years 29 days 6 years 11 months 12 days
Options exercisable, Shares, Ending 3,938,350  
Options exercisable, Weighted Average Exercise Price, Ending $ 4.06  
Options exercisable, Weighted Average Remaining Contractual Term (in years), Ending 6 years 1 month 17 days  
Options exercisable, Aggregate Intrinsic Value, Ending $ 4,020,000