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Other Expense (Tables)
 12 Months Ended
Dec. 31, 2017
Other Income and Expenses [Abstract]  
Summary of Other Expense
 
Year Ended December 31,
 
2017
$
 
2016
$
 
2015
$
Income tax expense
(5,330
)
 
(7,511
)
 
(3,406
)
Foreign exchange gain
79

 
1,413

 
613

Other income
250

 
120

 
50

Total
(5,001
)

(5,978
)

(2,743
)