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Prepaid expenses and deposits (Tables)
12 Months Ended
Dec. 31, 2013
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Schedule of prepaid expenses and deposits
Current:
 
 
 
 
  
 
December 31, 2013

 
December 31, 2012

Prepaid insurance and deposits
 
$
1,076

 
$
2,075

Prepaid lease payments
 
880

 
1,771

Prepaid interest
 
196

 
352

 
 
$
2,152

 
$
4,198

 
 
 
 
 
Long term:
 
 
 
 
  
 
December 31, 2013

 
December 31, 2012

Prepaid lease payments (note 12(a))
 
$
1,274

 
$
97