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Commitments and contingencies: Future payments (Details)
$ in Thousands
Dec. 31, 2020
MXN ($)
Commitments:  
Minimum lease payments payable under non-cancellable operating lease $ 24,848
2019  
Commitments:  
Minimum lease payments payable under non-cancellable operating lease 5,626
Later than one year  
Commitments:  
Minimum lease payments payable under non-cancellable operating lease $ 19,222