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Net Loss Per Share (Tables)
6 Months Ended
Jun. 30, 2013
Calculation of Historical Outstanding Dilutive Securities Not Included in Diluted Loss per Share
Historical outstanding dilutive securities not included in the diluted loss per share calculation are as follows:
 
 
June 30,
 
2013
 
2012
Outstanding options to purchase common stock
5,308,861

 
4,132,858

Warrants to purchase common stock
609,016

 
609,016

Total
5,917,877

 
4,741,874