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Prepaid expenses and deposits (Tables)
12 Months Ended
Dec. 31, 2017
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Schedule of prepaid expenses and deposits
  
 
December 31, 2017

 
December 31, 2016

Prepaid insurance and deposits
 
$
844

 
$
565

Current portion of prepaid lease payments
 
1,054

 
986

 
 
$
1,898

 
$
1,551