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Basic and Diluted Net Loss Per Share (Tables)
6 Months Ended
Jun. 30, 2012
Basic and Diluted Net Loss Per Share [Abstract]  
Summary of Potential Common Shares
                 
    June 30,
2012
    June 30,
2011
 

Stock options

    2,344,500       1,629,667  

Stock warrants

    805,521       805,521  

Total

    3,150,021       2,435,188