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Discontinued operations (Tables) | 6 Months Ended
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Jun. 30, 2021
Discontinued operations - Mexico project development. |
Schedule of financial information for Mexico project development | Summarized financial information for the Mexico project development is as follows:
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | June 30, | ​ | ​ | December 31,
​ | ​ | ​ | 2021 | ​ | ​ | 2020
Cash |  | $ | 69,158 |  | $ | 154,130
Prepaid expenses and other current assets | ​ | ​ | 96,086 | ​ | ​ | 88,978
Value added taxes receivable | ​ | ​ | 1,314,857 | ​ | ​ | 1,267,991
Property, plant and equipment, net | ​ |  | 3,409 | ​ |  | 5,682
Land | ​ |  | 21,126,898 | ​ |  | 21,126,898
Other assets | ​ |  | — | ​ |  | 33,909
Total assets of discontinued operations | ​ | $ | 22,610,408 | ​ | $ | 22,677,588
​ | ​ |  |  | ​ |  |
Total liabilities of discontinued operations | ​ | $ | 69,602 | ​ | $ | 190,933
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended June 30, | ​ | Six Months Ended June 30,
​ |  | 2021 |  | 2020 | ​ | 2021 |  | 2020
Revenue |  | $ | — |  | $ | — |  | $ | — |  | $ | —
Income from operations | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | —
Net loss from discontinued operations | ​ | $ | 151,379 | ​ | $ | 3,755,112 | ​ | $ | 464,173 | ​ | $ | 4,071,477
Gain on sale of discontinued operations | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | —
Depreciation expense | ​ | $ | 1,137 | ​ | $ | 1,136 | ​ | $ | 2,273 | ​ | $ | 2,272

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