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9. Share-Based Expense (Tables)
3 Months Ended
Mar. 31, 2019
Share-based Payment Arrangement [Abstract]  
Share-based expense
   Three Months Ended March 31, 
   2019   2018 
Research and development expenses  $11,418   $60,345 
General and administrative expenses   222,522    345,849 
   $233,940   $406,194