Quarterly report pursuant to Section 13 or 15(d)

7. Share-Based Compensation (Tables)

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7. Share-Based Compensation (Tables)
6 Months Ended
Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Share-based compensation expense
    Three Months Ended June 30,     Six Months Ended June 30,  
    2018     2017     2018     2017  
Research and development expenses   $ 109,426     $ 12,246     $ 169,771     $ 121,779  
General and administrative expenses     336,183       511,622       682,032       1,068,085  
    $ 445,609     $ 523,868     $ 851,803     $ 1,189,864