Quarterly report pursuant to Section 13 or 15(d)

8. Share-Based Compensation (Tables)

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8. Share-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Share-based compensation expense
    Three Months Ended June 30,     Six Months Ended June 30,  
    2017     2016     2017     2016  
Research and development expenses   $ 12,246     $ 1,427,691     $ 121,779     $ 1,234,240  
Administrative expenses     511,622       304,112       1,068,085       784,023  
    $ 523,868     $ 1,731,803     $ 1,189,864     $ 2,018,263