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Prepaid expenses and deposits (Tables)
12 Months Ended
Dec. 31, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Schedule of prepaid expenses and deposits
  
 
December 31, 2018

 
December 31, 2017

Prepaid insurance and deposits
 
$
1,149

 
$
844

Prepaid interest payments
 
826

 
85

Current portion of prepaid lease payments
 
1,761

 
969

 
 
$
3,736

 
$
1,898