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Discontinued operations (Tables) | 12 Months Ended
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Dec. 31, 2021
Discontinued operations. |
Schedule of financial information for Mexico project development | Summarized financial information for the discontinued Mexico project development operation is as follows:
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ | ​ | ​ | 2021 | ​ | ​ | 2020
Cash |  | $ | 750,048 |  | $ | 154,130
Prepaid expenses and other current assets | ​ | ​ | 82,783 | ​ | ​ | 88,978
Value added taxes receivable (net of allowance of $1,279,757 and $316,217, respectively) | ​ | ​ | 340,910 | ​ | ​ | 1,267,991
Property, plant and equipment, net | ​ |  | — | ​ |  | 5,682
Land | ​ |  | 21,126,898 | ​ |  | 21,126,898
Other assets | ​ |  | 19,288 | ​ |  | 33,909
Total assets of discontinued operations | ​ | $ | 22,319,927 | ​ | $ | 22,677,588
​ | ​ |  |  | ​ |  |
Total liabilities of discontinued operations | ​ | $ | 190,141 | ​ | $ | 190,933
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | Year Ended December 31,
​ |  | ​ | 2021 |  | 2020
Revenue |  |  | $ | — |  | $ | —
Income from operations | ​ | ​ | $ | — | ​ | $ | —
Net loss from discontinued operations | ​ | ​ | $ | 2,574,079 | ​ | $ | 4,902,243
Depreciation expense | ​ | ​ | $ | 4,545 | ​ | $ | 4,545

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