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Prepaid expenses and other current assets (Details) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Prepaid Expense and Other Assets, Current [Abstract]    
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