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Net Loss Per Share (Tables)
3 Months Ended
Mar. 31, 2013
Earnings Per Share [Abstract]  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]

The following potentially dilutive securities were excluded from the computation of diluted net loss per share because their effect would have been anti-dilutive:

 

    Three Months Ended March 31,  
    2013     2012  
             
Stock options     998,086       1,054,288  
Warrants     1,722,628       1,722,628