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Prepaid Expenses and Other Current Assets (Tables)
9 Months Ended
Sep. 30, 2017
Prepaid Expenses and Other Current Assets [Abstract]  
Summary of prepaid expenses and other current assets

  September 30,  December 31, 
  2017  2016 
Prepaid insurance $76,211  $332,809 
Prepaid clinical trial expenses  406,833   1,093,441 
Other prepaid expenses  189,908   410,201 
Total prepaid expenses and other current assets $672,952  $1,836,451