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Financial obligations - Lease liabilities related to right in use (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
item
Dec. 31, 2019
USD ($)
Disclosure of Financial obligations [Line Items]    
Lease liabilities $ 7,839 $ 7,503
Current portion 3,609 3,692
Non-current portion $ 4,230 3,811
Lease term 10 years  
Number of renewal options | item 2  
Lease renewal term 5 years  
Future minimum rentals payable $ 3,697 5,167
Less than 1 year    
Disclosure of Financial obligations [Line Items]    
Future minimum rentals payable 1,470 1,470
Later than one year and not later than five years [member]    
Disclosure of Financial obligations [Line Items]    
Future minimum rentals payable 2,227 3,697
Buildings and other constructions    
Disclosure of Financial obligations [Line Items]    
Lease liabilities 3,971 5,296
Transportation units    
Disclosure of Financial obligations [Line Items]    
Lease liabilities 3,186 1,429
Machinery and equipment    
Disclosure of Financial obligations [Line Items]    
Lease liabilities $ 682 $ 778