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Leases and right-of-use assets (Tables)
 12 Months Ended
Dec. 31, 2019
Disclosure of Leases [Abstract]  
Disclosure of additional information about leasing activities for lessee
 
Right-of-use
Land and buildings

 
Right-of-use
Plant and equipment and Capital works in progress

 
Total

 
 
 
 
 
 
Cost
 
 
 
 
 
Balance at December 31, 2018
$
—

 
$
11,345

 
$
11,345

Initial adoption of IFRS 16
7,555

 
1,824

 
9,379

Additions
552

 
13,463

 
14,015

Disposals
—

 
(232
)
 
(232
)
Balance at December 31, 2019
$
8,107

 
$
26,400

 
$
34,507

 
 
 
 
 
 
Accumulated Depreciation
 
 
 
 
 
Balance at December 31, 2018
$
—

 
$
—

 
$
—

Depreciation for the year
(1,184
)
 
(4,705
)
 
(5,889
)
Disposals
—

 
151

 
151

Balance at December 31, 2019
$
(1,184
)
 
$
(4,554
)
 
$
(5,738
)
 
 
 
 
 
 
Right-of-use assets, net carrying amount
$
6,923

 
$
21,846

 
$
28,769