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Shares Reserved (Tables)
12 Months Ended
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Common stock reserved for future issuance

Common stock reserved for future issuance was as follows:

 

   December 31,
   2014  2013
Stock option grants outstanding (see Note 7)    1,891,058    1,659,170 
Reserved for future stock option grants (see Note 7)    146,917    215,898 
Reserved for note conversion (see Note 2)    977,398    1,050,325 
Reserved for exercise of outstanding warrants (see Note 8)    313,375    1,033,776 
    3,328,748    3,959,169