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Shares Reserved (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Common stock reserved for future issuance

Common stock reserved for future issuance was as follows:

 

   December 31,
   2017  2016
Stock option grants outstanding (see Note 5)    2,247,026    2,161,085 
Reserved for future stock option grants (see Note 5)    85,337    95,981 
Reserved for note conversion (see Note 2)    —      972,884 
    2,332,363    3,229,950