9. Shareholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2013
Shareholders Equity Tables  
Options and Warrants assumptions used

 

   Year Ended December 31, 
   2013   2012 
Expected life (years)   5.41    5.63 
Risk-free interest rate   0.73%    1.32% 
Volatility   80%    79% 
Expected dividend yield   –    – 

 
Stock option activity

 

           Weighted
   Number of   Weighted   Average
   Shares   Average   Remaining
   (in thousands)   Exercise Price   Contractual Term
Options outstanding at the beginning of period   8,652   $1.58    N/A
Granted   3,040    7.43    N/A
Exercised   (1,413)   1.50    N/A
Forfeited/Expired   (151)   4.64    N/A
Options outstanding at the end of period   10,128   $3.30   6.40 years
              
Options exercisable at the end of period   5,777   $2.17   4.96 years