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Stockholders' equity: (Tables) | 12 Months Ended
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Dec. 31, 2021
Stockholders' equity: |
Schedule of total share capital | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ |  | ​ | ​ | ​ | ​ | ​ | Capital stock as of
​ |  | Total shares |  | December 31,
Description | ​ | 2020 |  | 2021 | ​ | 2020 |  | 2021
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
“B” Series | ​ | ​ | 277,050,000 | ​ | ​ | 277,050,000 | ​ | Ps. | 7,173,079 | ​ | Ps. | 7,173,079
“BB” Series | ​ |  | 22,950,000 | ​ |  | 22,950,000 | ​ |  | 594,197 | ​ |  | 594,197
Total | ​ | ​ | 300,000,000 | ​ | ​ | 300,000,000 | ​ | Ps. | 7,767,276 | ​ | Ps. | 7,767,276

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