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FINANCE EXPENSE, NET (Tables)
 12 Months Ended
Dec. 31, 2018
Analysis of income and expense [abstract]  
Components of finance income and expense
Finance income and expense includes the following components:
 
For the Years Ended December 31,
 
2018
 
2017
Interest income
$
(559
)
 
$
(72
)
Interest expense, net of capitalized interest (see Note 7)
13,281

 
6,039

Interest on financing component of deferred revenue (see Note 11)
4,750

 
—

Net foreign exchange gain
(91
)
 
(172
)
Accretion of rehabilitation provision
691

 
1,245

Conversion make-whole payment
—

 
1,445

 
$
18,072

 
$
8,485