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Prepaid expenses and other current assets (Tables)
12 Months Ended
Dec. 31, 2018
Prepaid Expense and Other Assets, Current [Abstract]  
Prepaid expenses and other current assets
Prepaid expenses and other current assets include the following at December 31, 2018 and 2017:
 
 
2018
 
2017
Prepaid insurance
 
$
90,754

 
$
84,801

Prepaid supplies
 
19,422

 
33,132

Prepaid professional services
 
38,375

 
16,059

Prepaid rent and lease deposits
 
13,508

 
5,852

Other current assets
 
153,910

 
387,478

Total prepaid expenses and other current assets
 
$
315,969

 
$
527,322