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Shares Reserved (Tables)
12 Months Ended
Dec. 31, 2016
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,
   2016  2015
Stock option grants outstanding (see Note 6)   2,161,085    2,022,353 
Reserved for future stock option grants (see Note 6)   95,981    121,750 
Reserved for note conversion (see Note 2)   972,884    977,398 
Reserved for exercise of outstanding warrants (see Note 7)   —      169,335 
    3,229,950    3,290,836