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Accrued Expenses (Tables)
 6 Months Ended
Jun. 30, 2017
Accrued Expenses [Abstract]  
Summary of accrued expenses
  June 30,
2017		  December 31, 2016 
       
Clinical trial expenses $1,371,721  $741,174 
Other  110,963   64,944 
Total $1,482,684  $806,118