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Shares Reserved (Tables)
12 Months Ended
Dec. 31, 2019
Notes to Financial Statements  
Common stock reserved for future issuance

Common stock reserved for future issuance was as follows:

 

  December 31,
   2019  2018
Stock option grants outstanding (see Note 4)   2,392,786    2,374,124 
Reserved for future stock option grants (see Note 4)   308,871    116,703 
    2,701,657    2,490,827