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Finance income and expense
 12 Months Ended
Dec. 31, 2018
Analysis of income and expense [abstract]  
Finance income and expense
Finance income and expense:
 
2018

 
2017

Employee future benefit plan expense (note 19)
$
(226
)
 
$
(230
)
Pension administration expense
(117
)
 
(118
)
Investment and other income
1,034

 
417

Other income (loss)
(62
)
 
19

Foreign exchange gain (loss)
(1,078
)
 
1,692

Finance income (loss) and other
$
(449
)
 
$
1,780

Finance expense
$
(503
)
 
$
(732
)