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Commitments and contingencies (Tables)
12 Months Ended
Dec. 31, 2020
Commitments and contingencies [Abstract]  
Contractual obligations
As at December 31, 2020
 
Less than 1
year
  
1-3
years
  
3-5
years
  
More than 5
years
  
Total
 
Lease liabilities – existing
  
3,529
   
5,322
   
4,286
   
32,600
   
45,737
 
Lease liabilities – contingent
  
-
   
2,254
   
2,471
   
1,841
   
6,566
 
Manufacturing
  
2,824
   
500
   
-
   
-
   
3,324
 
Capital commitments
  
77
   
-
   
-
   
-
   
77
 
Total contractual obligations
  
6,430
   
8,076
   
6,757
   
34,441
   
55,704
 

As at December 31, 2019
 
Less than 1
year
  
1-3
years
  
3-5
years
  
More than 5
years
  
Total
 
Lease liabilities – existing
  
4,469
   
8,958
   
7,876
   
45,288
   
66,591
 
Lease liabilities – contingent
  68
   1,604
   2,685
   2,688
   7,045
 
Manufacturing
  
3,669
   
642
   
-
   
-
   
4,311
 
Capital commitments
  
1,460
   
-
   
-
   
-
   
1,460
 
Total contractual obligations
  
9,666
   
11,204
   
10,561
   
47,976
   
79,407