Quarterly report pursuant to Section 13 or 15(d)

7. Share-Based Compensation (Tables)

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7. Share-Based Compensation (Tables)
3 Months Ended
Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Share-based compensation expense
    Three Months Ended March 31,  
    2018     2017  
Research and development expenses   $ 60,345     $ 109,533  
General and administrative expenses     345,849       556,464  
    $ 406,194     $ 665,997