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Commitments and contingencies (Details)
$ in Thousands
Dec. 31, 2020
USD ($)
Disclosure of other provisions [line items]  
Minimum annual rental $ 5,435
2021  
Disclosure of other provisions [line items]  
Minimum annual rental 1,586
2022  
Disclosure of other provisions [line items]  
Minimum annual rental 1,389
2023  
Disclosure of other provisions [line items]  
Minimum annual rental 1,098
2024  
Disclosure of other provisions [line items]  
Minimum annual rental 877
2025  
Disclosure of other provisions [line items]  
Minimum annual rental $ 485