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Accounts payable and accrued liabilities (Tables)
3 Months Ended
Mar. 31, 2019
Payables and Accruals [Abstract]  
Schedule of accounts payable and accrued liabilities
Accounts payable and accrued liabilities include the following:
 
 
March 31,
 
December 31,
 
 
2019
 
2018
Accounts payable
 
$
279,471

 
$
366,917

Accrued payroll including vacation
 
195,922

 
223,481

Accrued professional fees and research costs
 
344,635

 
185,992

Accrued franchise and excise taxes
 
117,747

 
23,678

Accrued construction costs
 
4,503

 
13,716

Accrued other
 
15,780

 
11,116

Accounts payable and accrued liabilities
 
$
958,058

 
$
824,900