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Changes In Non-Cash Working Capital Items (Tables)
 12 Months Ended
Dec. 31, 2019
Disclosure Of Changes In Non Cash Working Capital Items [Abstract]  
Summary of changes in non cash working capital items
 
  
For the Years Ended December 31,
 
 
  
2019
 
  
2018
 
  
2017
 
Trade receivables
  
$
2,301
 
  
$
(33
) 
  
$
(1,059
) 
Inventories
  
 
9,042
 
  
 
(5,435
) 
  
 
(895
) 
Due from joint ventures
  
 
(3,530
) 
  
 
—  
 
  
 
—  
 
Other receivables
  
 
(448
) 
  
 
1,239
 
  
 
(1,062
) 
Prepaid expenses and deposits
  
 
(370
) 
  
 
(79
) 
  
 
(134
) 
Trade payables
  
 
(1,953
) 
  
 
1,649
 
  
 
241
 
Accrued liabilities
  
 
(369
) 
  
 
(284
) 
  
 
207
 
Other assets, net of other liabilities
  
 
571
 
  
 
(206
) 
  
 
(817
) 
 
  
 
 
 
  
 
 
 
  
 
 
 
 
  
$
5,244
 
  
$
(3,149
) 
  
$
(3,519
)