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Prepaid Expenses and Other Current Assets (Tables)
12 Months Ended
Dec. 31, 2017
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Summary of prepaid expenses and other current assets
   December 31,   December 31, 
   2017   2016 
Prepaid insurance  $72,371   $332,809 
Prepaid clinical trial expenses   226,997    1,093,441 
Other prepaid expenses   139,954    410,201 
Total prepaid expenses and other current assets  $439,322   $1,836,451