v2.4.0.6
Stock Based Compensation (Details) (Stock Options [Member])
6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Stock Options [Member]
   
Weighted-average assumptions    
Expected dividend yield 0.00% 0.00%
Expected stock price volatility, minimum 96.00% 97.00%
Expected stock price volatility, maximum 97.00% 98.00%
Risk-free interest rate, minimum 2.59% 3.91%
Risk-free interest rate. maximum 2.70% 4.20%
Expected life of options, minimum (Years) 2 years 3 years
Expected life of options, maximum (Years) 9 years 10 months 9 days 9 years 10 months 24 days