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Commitments and contingencies: Future payments (Details)
$ in Thousands
Dec. 31, 2021
MXN ($)
Commitments:  
Minimum lease payments payable under non-cancellable operating lease $ 22,947
Not Later Than One Year Member  
Commitments:  
Minimum lease payments payable under non-cancellable operating lease 6,884
Later than one year  
Commitments:  
Minimum lease payments payable under non-cancellable operating lease $ 16,063