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Accounts payable and accrued liabilities
6 Months Ended
Jun. 30, 2018
Payables and Accruals [Abstract]  
Accounts payable and accrued liabilities
Accounts payable and accrued liabilities
Accounts payable and accrued liabilities include the following:
 
 
June 30,
 
December 31,
 
 
2018
 
2017
Accounts payable
 
$
526,228

 
$
1,089,919

Accrued payroll including vacation
 
257,281

 
364,368

Accrued professional fees and research costs
 
209,102

 
443,178

Accrued franchise and excise taxes
 
40,001

 
240,880

Accrued construction costs
 
99,901

 
509,950

Accrued other
 
36,362

 
18,560

Accounts payable and accrued liabilities
 
$
1,168,875

 
$
2,666,855