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Net Loss Per Share (Tables)
9 Months Ended
Sep. 30, 2014
Earnings Per Share [Abstract]  
Calculation of Historical Outstanding Dilutive Securities Not Included in Diluted Loss per Share
Potentially dilutive securities excluded from the diluted loss per share calculation are as follows:
 
September 30,
 
2014
 
2013
Outstanding options to purchase common stock
6,779,998

 
6,909,332

Warrants to purchase common stock
604,327

 
609,016

Total
7,384,325

 
7,518,348